ESLint: Initialization error (ESLint). packagePath is not defined

朽木自雕xmzd 2020-03-05 11:26:30

IDE是webstorm，这个怎么解决啊，怎么都消不掉，百度谷歌也没有关于这个问题的
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朽木自雕xmzd 2020-04-15
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引用 2 楼 xytianya 的回复:
搞了好几天终于解决了，我看网上就咱俩同病相怜 webstorm路径\plugins\JavaScriptLanguage\languageService\eslint\bin\eslint-plugin.js 找到这个文件发现22行被注释掉了 放开22行，注释掉23行就好了。。。 考虑应该是安装CLI3的时候被修改的。。。
万分感谢，好像是好了，你说的原因应该也是对的，确实好像改过
xytianya 2020-04-14
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搞了好几天终于解决了，我看网上就咱俩同病相怜 webstorm路径\plugins\JavaScriptLanguage\languageService\eslint\bin\eslint-plugin.js 找到这个文件发现22行被注释掉了 放开22行，注释掉23行就好了。。。 考虑应该是安装CLI3的时候被修改的。。。
acpi控制笔记本风扇转速
笔记本的风扇控制 ---------------------------------------- 09 November 2006. Summary of changes for version 20061109: 1) ACPI CA Core Subsystem: Optimized the Load ASL operator in the case where the source operand is an operation region. Simply map the operation region memory, instead of performing a bytewise read. (Region must be of type SystemMemory, see below.) Fixed the Load ASL operator for the case where the source operand is a region field. A buffer object is also allowed as the source operand. BZ 480 Fixed a problem where the Load ASL operator allowed the source operand to be an operation region of any type. It is now restricted to regions of type SystemMemory, as per the ACPI specification. BZ 481 Additional cleanup and optimizations for the new Table Manager code. AcpiEnable will now fail if all of the required ACPI tables are not loaded (FADT, FACS, DSDT). BZ 477 Added #pragma pack(8/4) to acobject.h to ensure that the structures in this header are always compiled as aligned. The ACPI_OPERAND_OBJECT has been manually optimized to be aligned and will not work if it is byte-packed. Example Code and Data Size: These are the sizes for the OS- independent acpica.lib produced by the Microsoft Visual C++ 6.0 32- bit compiler. The debug version of the code includes the debug output trace mechanism and has a much larger code and data size. Previous Release: Non-Debug Version: 78.1K Code, 17.1K Data, 95.2K Total Debug Version: 155.4K Code, 63.1K Data, 218.5K Total Current Release: Non-Debug Version: 77.9K Code, 17.0K Data, 94.9K Total Debug Version: 155.2K Code, 63.1K Data, 218.3K Total 2) iASL Compiler/Disassembler and Tools: Fixed a problem where the presence of the _OSI predefined control method within complex expressions could cause an internal compiler error. AcpiExec: Implemented full region support for multiple address spaces. SpaceId is now part of the REGION object. BZ 429 ---------------------------------------- 11 Oc
spring-framework-reference4.1.4
Not Using Commons Logging ................................................................... 12 Using SLF4J ............................................................................................ 13 Using Log4J ............................................................................................. 14 II. What’s New in Spring Framework 4.x .................................................................................... 16 3. New Features and Enhancements in Spring Framework 4.0 ............................................ 17 3.1. Improved Getting Started Experience .................................................................. 17 3.2. Removed Deprecated Packages and Methods .................................................... 17 3.3. Java 8 (as well as 6 and 7) ............................................................................... 17 3.4. Java EE 6 and 7 ............................................................................................... 18 3.5. Groovy Bean Definition DSL .............................................................................. 18 3.6. Core Container Improvements ............................................................................ 19 3.7. General Web Improvements ............................................................................... 19 3.8. WebSocket, SockJS, and STOMP Messaging ..................................................... 19 3.9. Testing Improvements ........................................................................................ 20 III. Core Technologies .............................................................................................................. 21 4. The IoC container ........................................................................................................ 22 4.1. Introduction to the Spring IoC container and beans .............................................. 22 4.2. Container overview ............................................................................................ 22 Configuration metadata ..................................................................................... 23 Instantiating a container .................................................................................... 24 Composing XML-based configuration metadata .......................................... 25 Using the container .......................................................................................... 26 4.3. Bean overview ................................................................................................... 27 Naming beans .................................................................................................. 28 Aliasing a bean outside the bean definition ................................................ 28 Instantiating beans ........................................................................................... 29 Instantiation with a constructor .................................................................. 29 Instantiation with a static factory method .................................................... 30 Spring Framework 4.0.0.RELEASE Spring Framework Reference Documentation iii Instantiation using an instance factory method ........................................... 30 4.4. Dependencies ................................................................................................... 32 Dependency injection ....................................................................................... 32 Constructor-based dependency injection .................................................... 32 Setter-based dependency injection ............................................................ 34 Dependency resolution process ................................................................. 35 Examples of dependency injection ............................................................. 36 Dependencies and configuration in detail ........................................................... 38 Straight values (primitives, Strings, and so on) ........................................... 38 References to other beans (collaborators) .................................................. 40 Inner beans .............................................................................................. 41 Collections ............................................................................................... 41 Null and empty string values ..................................................................... 44 XML shortcut with the p-namespace .......................................................... 44 XML shortcut with the c-namespace .......................................................... 46 Compound property names ....................................................................... 46 Using depends-on ............................................................................................ 47 Lazy-initialized beans ....................................................................................... 47 Autowiring collaborators .................................................................................... 48 Limitations and disadvantages of autowiring ............................................... 49 Excluding a bean from autowiring .............................................................. 50 Method injection ............................................................................................... 50 Lookup method injection ........................................................................... 51 Arbitrary method replacement ................................................................... 53 4.5. Bean scopes ..................................................................................................... 54 The singleton scope ......................................................................................... 55 The prototype scope ......................................................................................... 55 Singleton beans with prototype-bean dependencies ............................................ 56 Request, session, and global session scopes .................................................... 56 Initial web configuration ............................................................................ 57 Request scope ......................................................................................... 58 Session scope .......................................................................................... 58 Global session scope ............................................................................... 58 Scoped beans as dependencies ................................................................ 58 Custom scopes ................................................................................................ 60 Creating a custom scope .......................................................................... 60 Using a custom scope .............................................................................. 61 4.6. Customizing the nature of a bean ....................................................................... 62 Lifecycle callbacks ............................................................................................ 62 Initialization callbacks ............................................................................... 63 Destruction callbacks ................................................................................ 64 Default initialization and destroy methods .................................................. 64 Combining lifecycle mechanisms ............................................................... 66 Startup and shutdown callbacks ................................................................ 66 Shutting down the Spring IoC container gracefully in non-web applications ................................................................................................................. 68 ApplicationContextAware and BeanNameAware ................................................. 68 Other Aware interfaces ..................................................................................... 69 4.7. Bean definition inheritance ................................................................................. 71 4.8. Container Extension Points ................................................................................ 72 Spring Framework 4.0.0.RELEASE Spring Framework Reference Documentation iv Customizing beans using a BeanPostProcessor ................................................. 72 Example: Hello World, BeanPostProcessor-style ........................................ 74 Example: The RequiredAnnotationBeanPostProcessor ............................... 75 Customizing configuration metadata with a BeanFactoryPostProcessor ................ 75 Example: the Class name substitution PropertyPlaceholderConfigurer .......... 76 Example: the PropertyOverrideConfigurer .................................................. 77 Customizing instantiation logic with a FactoryBean ............................................. 78 4.9. Annotation-based container configuration ............................................................ 79 @Required ....................................................................................................... 80 @Autowired ..................................................................................................... 80 Fine-tuning annotation-based autowiring with qualifiers ....................................... 83 Using generics as autowiring qualifiers .............................................................. 89 CustomAutowireConfigurer ................................................................................ 90 @Resource ...................................................................................................... 90 @PostConstruct and @PreDestroy .................................................................... 92 4.10. Classpath scanning and managed components ................................................. 92 @Component and further stereotype annotations ............................................... 93 Meta-annotations .............................................................................................. 93 Automatically detecting classes and registering bean definitions .......................... 94 Using filters to customize scanning ................................................................... 95 Defining bean metadata within components ....................................................... 96 Naming autodetected components ..................................................................... 97 Providing a scope for autodetected components ................................................ 98 Providing qualifier metadata with annotations ..................................................... 99 4.11. Using JSR 330 Standard Annotations ............................................................... 99 Dependency Injection with @Inject and @Named ............................................. 100 @Named: a standard equivalent to the @Component annotation ....................... 100 Limitations of the standard approach ............................................................... 101 4.12. Java-based container configuration ................................................................. 102 Basic concepts: @Bean and @Configuration ................................................... 102 Instantiating the Spring container using AnnotationConfigApplicationContext ....... 103 Simple construction ................................................................................ 103 Building the container programmatically using register(Class…) ........... 104 Enabling component scanning with scan(String…) .................................... 104 Support for web applications with AnnotationConfigWebApplicationContext ............................................................................................................... 105 Using the @Bean annotation .......................................................................... 106 Declaring a bean .................................................................................... 107 Receiving lifecycle callbacks ................................................................... 107 Specifying bean scope ............................................................................ 108 Customizing bean naming ....................................................................... 109 Bean aliasing ......................................................................................... 109 Bean description ..................................................................................... 110 Using the @Configuration annotation ............................................................... 110 Injecting inter-bean dependencies ............................................................ 110 Lookup method injection ......................................................................... 111 Further information about how Java-based configuration works internally .... 111 Composing Java-based configurations ............................................................. 112 Using the @Import annotation ................................................................. 112 Conditionally including @Configuration classes or @Beans ....................... 116 Spring Framework 4.0.0.RELEASE Spring Framework Reference Documentation v Combining Java and XML configuration ................................................... 117 4.13. Bean definition profiles and environment abstraction ........................................ 120 4.14. PropertySource Abstraction ............................................................................ 120 4.15. Registering a LoadTimeWeaver ...................................................................... 120 4.16. Additional Capabilities of the ApplicationContext .............................................. 120 Internationalization using MessageSource ........................................................ 121 Standard and Custom Events .......................................................................... 124 Convenient access to low-level resources ........................................................ 127 Convenient ApplicationContext instantiation for web applications ....................... 128 Deploying a Spring ApplicationContext as a J2EE RAR file ............................... 128 4.17. The BeanFactory ........................................................................................... 129 BeanFactory or ApplicationContext? ................................................................ 129 Glue code and the evil singleton ..................................................................... 131 5. Resources .................................................................................................................. 132 5.1. Introduction ..................................................................................................... 132 5.2. The Resource interface .................................................................................... 132 5.3. Built-in Resource implementations .................................................................... 133 UrlResource ................................................................................................... 133 ClassPathResource ........................................................................................ 133 FileSystemResource ....................................................................................... 134 ServletContextResource .................................................................................. 134 InputStreamResource ..................................................................................... 134 ByteArrayResource ......................................................................................... 134 5.4. The ResourceLoader ....................................................................................... 134 5.5. The ResourceLoaderAware interface ................................................................ 135 5.6. Resources as dependencies ............................................................................. 136 5.7. Application contexts and Resource paths .......................................................... 137 Constructing application contexts ..................................................................... 137 Constructing ClassPathXmlApplicationContext instances - shortcuts .......... 137 Wildcards in application context constructor resource paths ............................... 138 Ant-style Patterns ................................................................................... 138 The Classpath*: portability classpath*: prefix ............................................ 139 Other notes relating to wildcards ............................................................. 139 FileSystemResource caveats .......................................................................... 140 6. Validation, Data Binding, and Type Conversion ............................................................ 141 6.1. Introduction ..................................................................................................... 141 6.2. Validation using Spring’s Validator interface ...................................................... 141 6.3. Resolving codes to error messages .................................................................. 143 6.4. Bean manipulation and the BeanWrapper ......................................................... 144 Setting and getting basic and nested properties ............................................... 144 Built-in PropertyEditor implementations ............................................................ 146 Registering additional custom PropertyEditors .......................................... 149 6.5. Spring Type Conversion ................................................................................... 151 Converter SPI ................................................................................................ 151 ConverterFactory ............................................................................................ 152 GenericConverter ........................................................................................... 153 ConditionalGenericConverter ................................................................... 154 ConversionService API ................................................................................... 154 Configuring a ConversionService ..................................................................... 154 Using a ConversionService programmatically ................................................... 155 Spring Framework 4.0.0.RELEASE Spring Framework Reference Documentation vi 6.6. Spring Field Formatting .................................................................................... 155 Formatter SPI ................................................................................................. 156 Annotation-driven Formatting ........................................................................... 157 Format Annotation API ............................................................................ 158 FormatterRegistry SPI ..................................................................................... 159 FormatterRegistrar SPI ................................................................................... 159 Configuring Formatting in Spring MVC ............................................................. 159 6.7. Configuring a global date & time format ............................................................ 161 6.8. Spring Validation ............................................................................................. 163 Overview of the JSR-303 Bean Validation API ................................................. 163 Configuring a Bean Validation Provider ............................................................ 164 Injecting a Validator ................................................................................ 164 Configuring Custom Constraints .............................................................. 164 Additional Configuration Options .............................................................. 165 Configuring a DataBinder ................................................................................ 165 Spring MVC 3 Validation ................................................................................. 166 Triggering @Controller Input Validation .................................................... 166 Configuring a Validator for use by Spring MVC ......................................... 166 Configuring a JSR-303/JSR-349 Validator for use by Spring MVC .............. 167 7. Spring Expression Language (SpEL) ........................................................................... 168 7.1. Introduction ..................................................................................................... 168 7.2. Feature Overview ............................................................................................ 168 7.3. Expression Evaluation using Spring’s Expression Interface ................................. 169 The EvaluationContext interface ...................................................................... 171 Type Conversion .................................................................................... 171 7.4. Expression support for defining bean definitions ................................................ 172 XML based configuration ................................................................................ 172 Annotation-based configuration ........................................................................ 173 7.5. Language Reference ........................................................................................ 174 Literal expressions .......................................................................................... 174 Properties, Arrays, Lists, Maps, Indexers ......................................................... 174 Inline lists ....................................................................................................... 175 Array construction ........................................................................................... 175 Methods ......................................................................................................... 176 Operators ....................................................................................................... 176 Relational operators ................................................................................ 176 Logical operators .................................................................................... 177 Mathematical operators ........................................................................... 177 Assignment .................................................................................................... 178 Types ............................................................................................................. 178 Constructors ................................................................................................... 179 Variables ........................................................................................................ 179 The #this and #root variables .................................................................. 179 Functions ....................................................................................................... 180 Bean references ............................................................................................. 180 Ternary Operator (If-Then-Else) ....................................................................... 180 The Elvis Operator ......................................................................................... 181 Safe Navigation operator ................................................................................ 181 Collection Selection ........................................................................................ 182 Collection Projection ....................................................................................... 182 Spring Framework 4.0.0.RELEASE Spring Framework Reference Documentation vii Expression templating ..................................................................................... 183 7.6. Classes used in the examples .......................................................................... 183 8. Aspect Oriented Programming with Spring ................................................................... 187 8.1. Introduction ..................................................................................................... 187 AOP concepts ................................................................................................ 187 Spring AOP capabilities and goals ................................................................... 189 AOP Proxies .................................................................................................. 190 8.2. @AspectJ support ........................................................................................... 190 Enabling @AspectJ Support ............................................................................ 190 Enabling @AspectJ Support with Java configuration ................................. 190 Enabling @AspectJ Support with XML configuration ................................. 191 Declaring an aspect ........................................................................................ 191 Declaring a pointcut ........................................................................................ 192 Supported Pointcut Designators .............................................................. 192 Combining pointcut expressions .............................................................. 194 Sharing common pointcut definitions ........................................................ 194 Examples ............................................................................................... 196 Writing good pointcuts ............................................................................ 198 Declaring advice ............................................................................................. 199 Before advice ......................................................................................... 199 After returning advice .............................................................................. 200 After throwing advice .............................................................................. 200 After (finally) advice ................................................................................ 201 Around advice ........................................................................................ 202 Advice parameters .................................................................................. 203 Advice ordering ...................................................................................... 206 Introductions ................................................................................................... 206 Aspect instantiation models ............................................................................. 207 Example ......................................................................................................... 208 8.3. Schema-based AOP support ............................................................................ 209 Declaring an aspect ........................................................................................ 210 Declaring a pointcut ........................................................................................ 210 Declaring advice ............................................................................................. 212 Before advice ......................................................................................... 212 After returning advice .............................................................................. 212 After throwing advice .............................................................................. 213 After (finally) advice ................................................................................ 214 Around advice ........................................................................................ 214 Advice parameters .................................................................................. 215 Advice ordering ...................................................................................... 216 Introductions ................................................................................................... 217 Aspect instantiation models ............................................................................. 217 Advisors ......................................................................................................... 217 Example ......................................................................................................... 218 8.4. Choosing which AOP declaration style to use .................................................... 220 Spring AOP or full AspectJ? ........................................................................... 220 @AspectJ or XML for Spring AOP? ................................................................. 221 8.5. Mixing aspect types ......................................................................................... 222 8.6. Proxying mechanisms ...................................................................................... 222 Understanding AOP proxies ............................................................................ 223 Spring Framework 4.0.0.RELEASE Spring Framework Reference Documentation viii 8.7. Programmatic creation of @AspectJ Proxies ..................................................... 225 8.8. Using AspectJ with Spring applications ............................................................. 225 Using AspectJ to dependency inject domain objects with Spring ........................ 226 Unit testing @Configurable objects .......................................................... 228 Working with multiple application contexts ................................................ 228 Other Spring aspects for AspectJ .................................................................... 229 Configuring AspectJ aspects using Spring IoC ................................................. 229 Load-time weaving with AspectJ in the Spring Framework ................................. 230 A first example ....................................................................................... 231 Aspects .................................................................................................. 234 ' META-INF/aop.xml' ............................................................................... 234 Required libraries (JARS) ........................................................................ 234 Spring configuration ................................................................................ 235 Environment-specific configuration ........................................................... 237 8.9. Further Resources ........................................................................................... 239 9. Spring AOP APIs ....................................................................................................... 240 9.1. Introduction ..................................................................................................... 240 9.2. Pointcut API in Spring ...................................................................................... 240 Concepts ........................................................................................................ 240 Operations on pointcuts .................................................................................. 241 AspectJ expression pointcuts .......................................................................... 241 Convenience pointcut implementations ............................................................ 241 Static pointcuts ....................................................................................... 241 Dynamic pointcuts .................................................................................. 242 Pointcut superclasses ..................................................................................... 243 Custom pointcuts ............................................................................................ 243 9.3. Advice API in Spring ........................................................................................ 243 Advice lifecycles ............................................................................................. 243 Advice types in Spring .................................................................................... 244 Interception around advice ...................................................................... 244 Before advice ......................................................................................... 244 Throws advice ........................................................................................ 245 After Returning advice ............................................................................ 246 Introduction advice .................................................................................. 247 9.4. Advisor API in Spring ....................................................................................... 249 9.5. Using the ProxyFactoryBean to create AOP proxies ........................................... 250 Basics ............................................................................................................ 250 JavaBean properties ....................................................................................... 250 JDK- and CGLIB-based proxies ...................................................................... 251 Proxying interfaces ......................................................................................... 252 Proxying classes ............................................................................................ 254 Using global advisors ...................................................................................... 255 9.6. Concise proxy definitions ................................................................................. 255 9.7. Creating AOP proxies programmatically with the ProxyFactory ............................ 256 9.8. Manipulating advised objects ............................................................................ 257 9.9. Using the "auto-proxy" facility ........................................................................... 258 Autoproxy bean definitions .............................................................................. 258 BeanNameAutoProxyCreator ................................................................... 259 DefaultAdvisorAutoProxyCreator .............................................................. 259 AbstractAdvisorAutoProxyCreator ............................................................ 260 Spring Framework 4.0.0.RELEASE Spring Framework Reference Documentation ix Using metadata-driven auto-proxying ............................................................... 260 9.10. Using TargetSources ...................................................................................... 262 Hot swappable target sources ......................................................................... 263 Pooling target sources .................................................................................... 263 Prototype target sources ................................................................................. 265 ThreadLocal target sources ............................................................................. 265 9.11. Defining new Advice types ............................................................................. 265 9.12. Further resources ........................................................................................... 266 10. Testing ..................................................................................................................... 267 10.1. Introduction to Spring Testing ......................................................................... 267 10.2. Unit Testing ................................................................................................... 267 Mock Objects ................................................................................................. 267 Environment ........................................................................................... 267 JNDI ...................................................................................................... 267 Servlet API ............................................................................................. 267 Portlet API ............................................................................................. 268 Unit Testing support Classes .......................................................................... 268 General utilities ...................................................................................... 268 Spring MVC ........................................................................................... 268 10.3. Integration Testing ......................................................................................... 268 Overview ........................................................................................................ 268 Goals of Integration Testing ............................................................................ 269 Context management and caching ........................................................... 269 Dependency Injection of test fixtures ....................................................... 269 Transaction management ........................................................................ 270 Support classes for integration testing ..................................................... 270 JDBC Testing Support .................................................................................... 271 Annotations .................................................................................................... 271 Spring Testing Annotations ..................................................................... 271 Standard Annotation Support .................................................................. 276 Spring JUnit Testing Annotations ............................................................. 277 Meta-Annotation Support for Testing ........................................................ 278 Spring TestContext Framework ....................................................................... 279 Key abstractions ..................................................................................... 280 Context management .............................................................................. 281 Dependency injection of test fixtures ........................................................ 297 Testing request and session scoped beans .............................................. 299 Transaction management ........................................................................ 301 TestContext Framework support classes .................................................. 304 Spring MVC Test Framework .......................................................................... 306 Server-Side Tests ................................................................................... 306 Client-Side REST Tests .......................................................................... 312 PetClinic Example .......................................................................................... 313 10.4. Further Resources ......................................................................................... 314 IV. Data Access ..................................................................................................................... 316 11. Transaction Management .......................................................................................... 317 11.1. Introduction to Spring Framework transaction management .............................. 317 11.2. Advantages of the Spring Framework’s transaction support model ..................... 317 Global transactions ......................................................................................... 317 Local transactions ........................................................................................... 318 Spring Framework 4.0.0.RELEASE Spring Framework Reference Documentation x Spring Framework’s consistent programming model ......................................... 318 11.3. Understanding the Spring Framework transaction abstraction ............................ 319 11.4. Synchronizing resources with transactions ....................................................... 323 High-level synchronization approach ................................................................ 323 Low-level synchronization approach ................................................................. 323 TransactionAwareDataSourceProxy ................................................................. 324 11.5. Declarative transaction management ............................................................... 324 Understanding the Spring Framework’s declarative transaction implementation ... 325 Example of declarative transaction implementation ........................................... 326 Rolling back a declarative transaction .............................................................. 330 Configuring different transactional semantics for different beans ........................ 331 settings ....................................................................................... 333 Using @Transactional ..................................................................................... 335 @Transactional settings .......................................................................... 339 Multiple Transaction Managers with @Transactional ................................. 340 Custom shortcut annotations ................................................................... 341 Transaction propagation .................................................................................. 341 Required ................................................................................................ 342 RequiresNew .......................................................................................... 342 Nested ................................................................................................... 343 Advising transactional operations ..................................................................... 343 Using @Transactional with AspectJ ................................................................. 346 11.6. Programmatic transaction management ........................................................... 347 Using the TransactionTemplate ....................................................................... 347 Specifying transaction settings ................................................................ 349 Using the PlatformTransactionManager ............................................................ 349 11.7. Choosing between programmatic and declarative transaction management ........ 350 11.8. Application server-specific integration .............................................................. 350 IBM WebSphere ............................................................................................. 351 Oracle WebLogic Server ................................................................................. 351 11.9. Solutions to common problems ....................................................................... 351 Use of the wrong transaction manager for a specific DataSource ....................... 351 11.10. Further Resources ....................................................................................... 351 12. DAO support ............................................................................................................ 352 12.1. Introduction .................................................................................................... 352 12.2. Consistent exception hierarchy ....................................................................... 352 12.3. Annotations used for configuring DAO or Repository classes ............................ 353 13. Data access with JDBC ............................................................................................ 355 13.1. Introduction to Spring Framework JDBC .......................................................... 355 Choosing an approach for JDBC database access ........................................... 355 Package hierarchy .......................................................................................... 356 13.2. Using the JDBC core classes to control basic JDBC processing and error handling ................................................................................................................. 357 JdbcTemplate ................................................................................................. 357 Examples of JdbcTemplate class usage ................................................... 357 JdbcTemplate best practices ................................................................... 359 NamedParameterJdbcTemplate ....................................................................... 361 SQLExceptionTranslator .................................................................................. 363 Executing statements ...................................................................................... 365 Running queries ............................................................................................. 365 Spring Framework 4.0.0.RELEASE Spring Framework Reference Documentation xi Updating the database .................................................................................... 366 Retrieving auto-generated keys ....................................................................... 367 13.3. Controlling database connections .................................................................... 367 DataSource .................................................................................................... 367 DataSourceUtils .............................................................................................. 369 SmartDataSource ........................................................................................... 369 AbstractDataSource ........................................................................................ 369 SingleConnectionDataSource .......................................................................... 369 DriverManagerDataSource .............................................................................. 369 TransactionAwareDataSourceProxy ................................................................. 370 DataSourceTransactionManager ...................................................................... 370 NativeJdbcExtractor ........................................................................................ 370 13.4. JDBC batch operations .................................................................................. 371 Basic batch operations with the JdbcTemplate ................................................. 371 Batch operations with a List of objects ............................................................. 372 Batch operations with multiple batches ............................................................ 373 13.5. Simplifying JDBC operations with the SimpleJdbc classes ................................ 374 Inserting data using SimpleJdbcInsert .............................................................. 374 Retrieving auto-generated keys using SimpleJdbcInsert .................................... 375 Specifying columns for a SimpleJdbcInsert ...................................................... 376 Using SqlParameterSource to provide parameter values ................................... 376 Calling a stored procedure with SimpleJdbcCall ............................................... 377 Explicitly declaring parameters to use for a SimpleJdbcCall ............................... 379 How to define SqlParameters .......................................................................... 380 Calling a stored function using SimpleJdbcCall ................................................. 381 Returning ResultSet/REF Cursor from a SimpleJdbcCall ................................... 381 13.6. Modeling JDBC operations as Java objects ..................................................... 382 SqlQuery ........................................................................................................ 383 MappingSqlQuery ........................................................................................... 383 SqlUpdate ...................................................................................................... 384 StoredProcedure ............................................................................................. 385 13.7. Common problems with parameter and data value handling .............................. 388 Providing SQL type information for parameters ................................................. 389 Handling BLOB and CLOB objects .................................................................. 389 Passing in lists of values for IN clause ............................................................ 390 Handling complex types for stored procedure calls ........................................... 391 13.8. Embedded database support .......................................................................... 392 Why use an embedded database? .................................................................. 392 Creating an embedded database instance using Spring XML ............................ 392 Creating an embedded database instance programmatically .............................. 392 Extending the embedded database support ...................................................... 393 Using HSQL ................................................................................................... 393 Using H2 ........................................................................................................ 393 Using Derby ................................................................................................... 393 Testing data access logic with an embedded database ..................................... 393 13.9. Initializing a DataSource ................................................................................. 394 Initializing a database instance using Spring XML ............................................. 394 Initialization of Other Components that Depend on the Database ............... 395 14. Object Relational Mapping (ORM) Data Access .......................................................... 397 14.1. Introduction to ORM with Spring ..................................................................... 397 Spring Framework 4.0.0.RELEASE Spring Framework Reference Documentation xii 14.2. General ORM integration considerations ......................................................... 398 Resource and transaction management ........................................................... 398 Exception translation ....................................................................................... 399 14.3. Hibernate ....................................................................................................... 399 SessionFactory setup in a Spring container ...................................................... 400 Implementing DAOs based on plain Hibernate 3 API ........................................ 400 Declarative transaction demarcation ................................................................ 402 Programmatic transaction demarcation ............................................................ 404 Transaction management strategies ................................................................ 405 Comparing container-managed and locally defined resources ............................ 407 Spurious application server warnings with Hibernate ......................................... 408 14.4. JDO .............................................................................................................. 409 PersistenceManagerFactory setup ................................................................... 409 Implementing DAOs based on the plain JDO API ............................................. 410 Transaction management ................................................................................ 412 JdoDialect ...................................................................................................... 413 14.5. JPA ............................................................................................................... 414 Three options for JPA setup in a Spring environment ........................................ 414 LocalEntityManagerFactoryBean .............................................................. 414 Obtaining an EntityManagerFactory from JNDI ......................................... 415 LocalContainerEntityManagerFactoryBean ............................................... 415 Dealing with multiple persistence units ..................................................... 417 Implementing DAOs based on plain JPA .......................................................... 418 Transaction Management ................................................................................ 420 JpaDialect ...................................................................................................... 421 15. Marshalling XML using O/X Mappers ......................................................................... 423 15.1. Introduction .................................................................................................... 423 Ease of configuration ...................................................................................... 423 Consistent Interfaces ...................................................................................... 423 Consistent Exception Hierarchy ....................................................................... 423 15.2. Marshaller and Unmarshaller .......................................................................... 423 Marshaller ...................................................................................................... 423 Unmarshaller .................................................................................................. 424 XmlMappingException ..................................................................................... 425 15.3. Using Marshaller and Unmarshaller ................................................................. 425 15.4. XML Schema-based Configuration .................................................................. 427 15.5. JAXB ............................................................................................................. 427 Jaxb2Marshaller ............................................................................................. 428 XML Schema-based Configuration ........................................................... 428 15.6. Castor ........................................................................................................... 429 CastorMarshaller ............................................................................................ 429 Mapping ......................................................................................................... 429 XML Schema-based Configuration ........................................................... 429 15.7. XMLBeans ..................................................................................................... 430 XmlBeansMarshaller ....................................................................................... 430 XML Schema-based Configuration ........................................................... 430 15.8. JiBX .............................................................................................................. 431 JibxMarshaller ................................................................................................ 431 XML Schema-based Configuration ........................................................... 431 15.9. XStream ........................................................................................................ 432 Spring Framework 4.0.0.RELEASE Spring Framework Reference Documentation xiii XStreamMarshaller ......................................................................................... 432 V. The Web ........................................................................................................................... 434 16. Web MVC framework ................................................................................................ 435 16.1. Introduction to Spring Web MVC framework .................................................... 435 Features of Spring Web MVC ......................................................................... 436 Pluggability of other MVC implementations ...................................................... 437 16.2. The DispatcherServlet .................................................................................... 437 Special Bean Types In the WebApplicationContext ........................................... 440 Default DispatcherServlet Configuration ........................................................... 441 DispatcherServlet Processing Sequence .......................................................... 441 16.3. Implementing Controllers ................................................................................ 443 Defining a controller with @Controller .............................................................. 443 Mapping Requests With Using @RequestMapping ........................................... 444 New Support Classes for @RequestMapping methods in Spring MVC 3.1 .. 446 URI Template Patterns ........................................................................... 447 URI Template Patterns with Regular Expressions ..................................... 448 Path Patterns ......................................................................................... 449 Patterns with Placeholders ...................................................................... 449 Matrix Variables ...................................................................................... 449 Consumable Media Types ....................................................................... 450 Producible Media Types .......................................................................... 451 Request Parameters and Header Values ................................................. 451 Defining @RequestMapping handler methods .................................................. 452 Supported method argument types .......................................................... 452 Supported method return types ............................................................... 454 Binding request parameters to method parameters with @RequestParam ... 455 Mapping the request body with the @RequestBody annotation .................. 456 Mapping the response body with the @ResponseBody annotation ............. 457 Creating REST Controllers with the @RestController annotation ................ 457 Using HttpEntity ...................................................................................... 457 Using @ModelAttribute on a method ....................................................... 458 Using @ModelAttribute on a method argument ......................................... 459 Using @SessionAttributes to store model attributes in the HTTP session between requests ................................................................................... 461 Specifying redirect and flash attributes ..................................................... 461 Working with "application/x-www-form-urlencoded" data ............................ 462 Mapping cookie values with the @CookieValue annotation ........................ 462 Mapping request header attributes with the @RequestHeader annotation ... 463 Method Parameters And Type Conversion ............................................... 463 Customizing WebDataBinder initialization ................................................. 464 Support for the Last-Modified Response Header To Facilitate Content Caching ................................................................................................. 465 Assisting Controllers with the @ControllerAdvice annotation ...................... 465 Asynchronous Request Processing .................................................................. 466 Exception Handling for Async Requests ................................................... 467 Intercepting Async Requests ................................................................... 467 Configuration for Async Request Processing ............................................ 468 Testing Controllers ......................................................................................... 469 16.4. Handler mappings .......................................................................................... 469 Intercepting requests with a HandlerInterceptor ................................................ 469 Spring Framework 4.0.0.RELEASE Spring Framework Reference Documentation xiv 16.5. Resolving views ............................................................................................. 471 Resolving views with the ViewResolver interface .............................................. 471 Chaining ViewResolvers ................................................................................. 473 Redirecting to views ....................................................................................... 474 RedirectView .......................................................................................... 474 The redirect: prefix ................................................................................. 475 The forward: prefix ................................................................................. 475 ContentNegotiatingViewResolver ..................................................................... 475 16.6. Using flash attributes ..................................................................................... 478 16.7. Building URIs ................................................................................................. 479 16.8. Building URIs to Controllers and methods ....................................................... 480 16.9. Using locales ................................................................................................. 480 Obtaining Time Zone Information .................................................................... 481 AcceptHeaderLocaleResolver .......................................................................... 481 CookieLocaleResolver ..................................................................................... 481 SessionLocaleResolver ................................................................................... 481 LocaleChangeInterceptor ................................................................................ 482 16.10. Using themes ............................................................................................... 482 Overview of themes ........................................................................................ 482 Defining themes ............................................................................................. 482 Theme resolvers ............................................................................................. 483 16.11. Spring’s multipart (file upload) support ........................................................... 483 Introduction .................................................................................................... 483 Using a MultipartResolver with Commons FileUpload ........................................ 484 Using a MultipartResolver with Servlet 3.0 ....................................................... 484 Handling a file upload in a form ...................................................................... 484 Handling a file upload request from programmatic clients .................................. 486 16.12. Handling exceptions ..................................................................................... 486 HandlerExceptionResolver ............
Python Power - The Comprehensive Guide (2008).pdf
CHAPTER 1 About Python ............................................................................................1 What Is Python? ................................................................................................................1 A Brief History of Python ................................................................................................2 Interpreters Versus Compilers .......................................................................................5 When to Use (or Not Use) an Interpreted Language .........................................8 Understanding Bytecodes ......................................................................................10 Why Use Python? ...........................................................................................................11 Object-Oriented ........................................................................................................11 Cross Platform ..........................................................................................................11 Broad User Base .......................................................................................................11 Well Supported in Third-Party Tools ...................................................................12 Good Selection of Tools Available ........................................................................12 Good Selection of Pre-built Libraries ..................................................................12 Where Is Python Used? .................................................................................................13 How Is Python Licensed? ..............................................................................................13 Where Do I Get Python? ...............................................................................................14 Installing Python ............................................................................................................14 Getting Information on Python ..................................................................................16 Python Communities .....................................................................................................17 Other Software ................................................................................................................18 And Now for Something Completely Different… ....................................................18 CHAPTER 2 Python Language Overview .................................................................19 Python Syntax .................................................................................................................20 Comments .................................................................................................................20 Indentation ...............................................................................................................20 Contents TABLE OF} vii Q Q Q Python Reserved Words ................................................................................................24 Decision Making and Iteration Keywords ..........................................................25 Debugging Keywords ..............................................................................................27 Package and Module Handling Keywords .........................................................27 Exception Handling Keywords ..............................................................................29 General Language Keywords .................................................................................31 Other Keywords ........................................................................................................32 Variable Usage ................................................................................................................34 The Continuation Variable ....................................................................................36 Watching Out for Spelling Mistakes! ..................................................................37 Predicates .........................................................................................................................38 Identifier Scope ...............................................................................................................39 Operators .........................................................................................................................42 Modulo Operator .....................................................................................................44 Exponential Operator .............................................................................................46 Logical Operators ....................................................................................................46 Comparative Operators ..........................................................................................49 Bitwise Operators ....................................................................................................51 Membership Operators and String Operators ..................................................53 Identity Operators ...................................................................................................53 In Conclusion ..................................................................................................................53 CHAPTER 3 Tools ..........................................................................................................55 IDLE ...................................................................................................................................55 File Menu ...................................................................................................................57 The Path Browser Dialog ........................................................................................62 Edit Menu ..................................................................................................................64 Shell Menu .................................................................................................................70 Debug Menu ..............................................................................................................71 The Edit Window ......................................................................................................79 Format Menu ............................................................................................................80 CONTENTS viii Q Q Q Command Line Compiler ..............................................................................................90 Creating Python Files ....................................................................................................93 Documentation ...............................................................................................................95 In Conclusion ..................................................................................................................96 CHAPTER 4 Data Types ...............................................................................................97 Numeric Types ................................................................................................................98 Integers ......................................................................................................................98 Demonstrating Long Integers ...............................................................................99 Octal and Hexadecimal ........................................................................................100 Floating Point Numbers .............................................................................................101 Strings ............................................................................................................................103 String Variables .....................................................................................................103 Concatenating Strings .........................................................................................106 Repeating Strings ..................................................................................................107 Substrings ...............................................................................................................108 Slicing ......................................................................................................................110 String Functions ....................................................................................................111 String Constants ....................................................................................................112 Conversion Functions ...........................................................................................114 Search Functions ...................................................................................................118 Formatting Functions ..........................................................................................120 Escape Sequences ..................................................................................................121 Sequences ......................................................................................................................122 Lists ..........................................................................................................................123 Shared References .................................................................................................128 Tuples .......................................................................................................................128 Dictionaries ............................................................................................................132 Advanced Type .............................................................................................................136 Classes and Objects ..............................................................................................136 Complex Type .........................................................................................................137 Generator Type ......................................................................................................138 CONTENTS ix Q Q Q None Type ...............................................................................................................139 Unicode Type ..........................................................................................................140 In Conclusion ................................................................................................................141 CHAPTER 5 Control Flow .........................................................................................143 Conditionals ..................................................................................................................144 The if Statement ..................................................................................................144 The elif Statement .............................................................................................147 The else Statement .............................................................................................149 Wrapping Up the Conditionals: A Cool Example ...........................................150 Loops ..............................................................................................................................153 The for Loop ..........................................................................................................153 The while Loop .....................................................................................................161 In Conclusion ................................................................................................................164 CHAPTER 6 Input and Output ................................................................................165 User Input ......................................................................................................................165 The input Function ..............................................................................................166 The raw_input Function ....................................................................................168 User Output ...................................................................................................................170 Formatting ..............................................................................................................172 File Input .......................................................................................................................175 File Output ....................................................................................................................177 Closing Files ..................................................................................................................179 Positioning in Files ......................................................................................................180 Directories and Files ...................................................................................................183 The stat Module: File Statistics ..............................................................................186 Command Line Arguments ........................................................................................190 Pickle ..............................................................................................................................192 In Conclusion ................................................................................................................195 CONTENTS x Q Q Q CHAPTER 7 Functions and Modules .....................................................................197 What Is a Function? ....................................................................................................197 Defining Functions in Python ...................................................................................197 What Are Arguments? ................................................................................................200 How Do You Pass an Argument to a Function? ....................................................201 Default Arguments ......................................................................................................203 Variable Default Arguments .....................................................................................205 Keyword Arguments ....................................................................................................206 Returning Values from Functions ............................................................................207 Returning Multiple Values from Functions ...........................................................209 Recursive Functions ....................................................................................................210 Passing Functions as Arguments .............................................................................212 Lambda Functions .......................................................................................................213 Variable Numbers of Arguments to a Function ....................................................215 Variable Scope in Functions ......................................................................................216 Using Modules ..............................................................................................................218 In Conclusion ................................................................................................................219 CHAPTER 8 Exception Handling ............................................................................221 Looking at Exceptions in Python ..............................................................................222 Traceback Example ......................................................................................................223 Understanding Tracebacks ........................................................................................224 Exceptions .....................................................................................................................225 Catching Exceptions with try..except .........................................................226 Multiple except Clauses .....................................................................................229 Blank except Clauses ..........................................................................................231 The else Clauses .........................................................................................................232 The finally Clause ....................................................................................................234 Raising Your Own Exceptions ...................................................................................235 Exception Arguments .................................................................................................237 User-Defined Exceptions ............................................................................................238 Working with the Exception Information ..............................................................239 CONTENTS xi Q Q Q exc_type ................................................................................................................239 exc_value ..............................................................................................................240 Using the with Clause for Files ................................................................................243 Re-throwing Exceptions .............................................................................................244 In Conclusion ................................................................................................................246 CHAPTER 9 Object-Oriented Programming .........................................................247 A Brief History of OOP ................................................................................................247 What Is an Object? ......................................................................................................248 Why Do We Use Objects? ...........................................................................................249 Reuse ........................................................................................................................249 Ease in Debugging .................................................................................................250 Maintainability ......................................................................................................250 The Attributes of Object-Oriented Development .................................................251 Abstraction .............................................................................................................251 Data Hiding ............................................................................................................252 Inheritance .............................................................................................................253 Polymorphism ........................................................................................................255 Terminology ..................................................................................................................256 Class .........................................................................................................................256 Object .......................................................................................................................256 Attribute ..................................................................................................................257 Method ....................................................................................................................258 Message Passing ....................................................................................................259 Event Handling ......................................................................................................260 Derivation ...............................................................................................................260 Coupling ..................................................................................................................261 Cohesion ..................................................................................................................261 Constants ................................................................................................................261 Other Concepts .............................................................................................................262 In Conclusion ................................................................................................................262 CONTENTS xii Q Q Q CHAPTER 10 Classes and Objects in Python ..........................................................265 Python Classes ..............................................................................................................265 Properties ......................................................................................................................267 Attribute Modifying Functions .................................................................................272 Private Attributes ........................................................................................................274 Doc Strings ....................................................................................................................275 Properties ......................................................................................................................277 The self Object ...........................................................................................................279 Methods .........................................................................................................................281 Special Methods ...........................................................................................................283 Initialization ...........................................................................................................283 Termination ............................................................................................................284 String Conversion ..................................................................................................285 Inheritance ....................................................................................................................287 Multiple Inheritance ...................................................................................................291 Using super ..................................................................................................................293 Polymorphism ..............................................................................................................295 Exception Classes .........................................................................................................297 Iterators .........................................................................................................................299 Operator Overloading .................................................................................................301 In Conclusion ................................................................................................................304 CHAPTER 11 The Python Library ..............................................................................305 Containers .....................................................................................................................305 Working with the deque Class ...........................................................................306 Math ................................................................................................................................312 Complex Math ..............................................................................................................313 Types ...............................................................................................................................315 Strings ............................................................................................................................318 Regular Expressions ....................................................................................................319 Patterns ...................................................................................................................320 Special Sequence Characters ..............................................................................323 CONTENTS xiii Q Q Q Compiling Regular Expressions .........................................................................323 Matching Strings ...................................................................................................324 Meta Characters ....................................................................................................326 Grouping .................................................................................................................327 System ............................................................................................................................328 Random Number Generation ....................................................................................330 Dates and Times ...........................................................................................................331 Creating a New Time ............................................................................................332 Time Operations ....................................................................................................332 Creating a New Date .............................................................................................333 Date Operations ....................................................................................................333 Time Zone Information ........................................................................................335 Operating System Interface .......................................................................................336 System Information ..............................................................................................336 Process Management ...........................................................................................337 In Conclusion ................................................................................................................341 CHAPTER 12 The GUI — TkInter ...............................................................................343 What Is TkInter? ...........................................................................................................343 Terms and Conditions .................................................................................................343 Event Handling ......................................................................................................344 Callbacks .................................................................................................................344 Widgets ....................................................................................................................345 Layout Managers ...................................................................................................345 Working with TkInter .................................................................................................346 Creating a Label ...........................................................................................................347 Frame Widgets and Centering ..................................................................................349 An Application with a Button ...................................................................................351 Working with Entry Fields and Grid Layouts ........................................................353 Creating a Class to Handle User Interfaces ...........................................................356 Working with List Boxes ............................................................................................358 Scrolling a List Box ................................................................................................361 CONTENTS xiv Q Q Q Menus .............................................................................................................................363 Context Menus .............................................................................................................366 Scale Widgets ................................................................................................................367 RadioButtons and CheckButton ...............................................................................370 Text Widgets .................................................................................................................373 In Conclusion ................................................................................................................375 CHAPTER 13 The Web Server—Apache ...................................................................377 Setting Up Apache .......................................................................................................377 Testing Apache .............................................................................................................378 Your First Python CGI Script: Hello Apache ...........................................................379 Examining the Hello Python Script ...................................................................380 The cgi-bin Directory ............................................................................................381 A Script for Displaying the Environment ...............................................................382 Receiving Data from an HTML File ..........................................................................384 Sending Data to an HTML File ..................................................................................387 How It All Works ...................................................................................................390 Dynamic HTML Displays Based on User Input ......................................................391 HTML Elements ............................................................................................................396 Cookies ...........................................................................................................................399 Uploading Files ............................................................................................................402 Redirection ....................................................................................................................403 Error Handling ..............................................................................................................405 In Conclusion ................................................................................................................406 CHAPTER 14 Working with Databases ...................................................................407 What Is a Database? ...................................................................................................407 Simple Database Terminology ...........................................................................408 What Is MySQL? ...........................................................................................................409 Downloading and Installing ......................................................................................409 Creating a New Database ..........................................................................................410 Creating a New User ....................................................................................................414 CONTENTS xv Q Q Q Opening an Existing Database .................................................................................415 Writing to a Database ................................................................................................417 Reading from a Database ..........................................................................................421 Updating a Database ..................................................................................................424 Deleting from a Database ..........................................................................................427 Searching a Database .................................................................................................430 In Conclusion ................................................................................................................436 CHAPTER 15 Putting It All Together .......................................................................437 Designing the Application .........................................................................................437 Program Flow .........................................................................................................437 User Interface Design ...........................................................................................438 Database Design ...................................................................................................439 Implementing the Database Tables ........................................................................440 Implementing the Forms ...........................................................................................442 Adding Reviews ............................................................................................................449 Adding the Review to the Database ........................................................................452 Listing the Reviews ......................................................................................................456 Deleting Books .............................................................................................................459 In Conclusion ................................................................................................................462 CHAPTER 16 Python and Graphics ..........................................................................463 The PIL Library ..............................................................................................................463 Downloading ..........................................................................................................464 Installing .................................................................................................................464 Verifying Your Installation ..................................................................................465 Creating a New Image ................................................................................................465 Function Parameters ............................................................................................466 Drawing on the Image ................................................................................................467 Drawing the Image ...............................................................................................468 Displaying the Image ...........................................................................................470 CONTENTS xvi Q Q Q
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