sqlite3_step() 与sqlite3_exec()的区别

youxin2012 2012-10-26 04:02:32

偶知道 sqlite3_step() 与sqlite3_exec() 都可以执行sql语句，想知道两者用起来的区别在哪？

除了 sqlite3_step() 在执行之前需要调用sqlite3_perpare(),之后需要sqlite3_finalize()

谢谢

...全文

4017 1 打赏收藏转发到动态举报

写回复

用AI写文章

1 条回复

切换为时间正序

请发表友善的回复…

发表回复

云敛容 2014-07-28

打赏
举报

sqlite3_exec() 就是把你提到的三个函数结合在了一起：sqlite3_step()， sqlite3_perpare()， sqlite3_finalize()。然后提供一个回调函数进行结果的处理。

EXPORTS sqlite3_aggregate_context sqlite3_aggregate_count sqlite3_bind_blob sqlite3_bind_double sqlite3_bind_int sqlite3_bind_int64 sqlite3_bind_null sqlite3_bind_parameter_count sqlite3_bind_parameter_index sqlite3_bind_parameter_name sqlite3_bind_text sqlite3_bind_text16 sqlite3_busy_handler sqlit

Visual studio 2012 下 sqlite3的工程文件,生成32或64位的sqlite3库 This page explains how to compile SQLite with Microsoft Visual Studio.NET (aka VS.NET). Download Download and unzip the file sqlite_source.zip (or sqlite-amalgamation-x_x_x_x.zip). Do not use the .tar.gz files because they have not been pre-processed for use with Windows. Create a starter DLL project File > New > Project. Under Project Types, select Visual C++ Projects and then Win32. Choose the project template "Win32 Project". Give the project a name and click OK. When the "Win32 Application Wizard" appears, choose Application Settings. set the Application Type to DLL and check the box that says "Empty project". Click Finish. You now have a blank DLL project. Add the SQLite files to the project Project > Add Existing Item. Add all the .c and .h files that you unzipped, except for: tclsqlite.c and shell.c. Note: You may add tclsqlite.c and shell.c, but then you have to define the preprocessor-symbol NO_TCL. Click Project -> Properties, navigate to the C/C++-folder and choose "Preprocessor". In the field that says "Preprocessor definitions" add NO_TCL to the existing string, separated by a semicolon. Under "Code Generation" for "Runtime Library" make sure to pick static linking. /MTd (release) or /MTd (debug) Make a .DEF file A .def file should be placed in the project directory. Get the def file by downloading the zipped sqlite DLL file under the "Precompiled Binaries For Windows" in the download page. Add the sqlite[3].def file to the project. Under Project > Properties navigate to the Linker folder and choose "Input". In the field that says "Module Definition File" type sqlite[3].def. NOTE: You have to do this twice, once for the Debug configuration and once for the Release configuration. Compile! The next 3 steps maybe be required by some. I was able to build the DLL and produce a .lib file only following the above 12 steps. for VS 2005. In order to build the lib file so that an application can link against the sqlite[3].dll you will need to add a step to the post-build event. Right click on Project, select Properties, expand Build Events and type "LIB /DEF:\sqlite[3].def" into the Command line field, both for debug and release configurations, where is the location to the file sqlite[3].def. To compile 3.3.7(this may apply to other versions too), I had to do this extra step: Add the project directory to the include path, here's how to do it in details: Under Project > Properties navigate to the C/C++ folder and choose "General", In the field "Additional Include Directories" type "."(a single dot, which is the current directory) Repeat for each configuration (debug/release/Win32/x64). To compile 3.6.14.1 (maybe others too), I also had to: Go to Project > Properties. Open the C/C++ then Preprocessor folder. Add "SQLITE_ENABLE_COLUMN_METADATA" to the list of preprocessor definitions. Repeat for each configuration (debug/release/Win32/x64). How to make the SQLITE.EXE command-line utility There are some slight changes if you wanted to build the sqlite.exe command-line utility, instead of the DLL. To do that, when you're creating the project and you get to the "Win32 Application Wizard", choose "Console Application" instead of "DLL". Then, when you are adding files to the project, also add shell.c. Finally, don't include the .DEF file. The sqllite def for version 2 is. EXPORTS sqlite_open sqlite_close sqlite_exec sqlite_last_insert_rowid sqlite_error_string sqlite_interrupt sqlite_complete sqlite_busy_handler sqlite_busy_timeout sqlite_get_table sqlite_free_table sqlite_mprintf sqlite_vmprintf sqlite_exec_printf sqlite_exec_vprintf sqlite_get_table_printf sqlite_get_table_vprintf sqlite_freemem sqlite_libversion sqlite_libencoding sqlite_changes sqlite_create_function sqlite_create_aggregate sqlite_function_type sqlite_user_data sqlite_aggregate_context sqlite_aggregate_count sqlite_set_result_string sqlite_set_result_int sqlite_set_result_double sqlite_set_result_error sqliteMalloc sqliteFree sqliteRealloc sqlite_set_authorizer sqlite_trace sqlite_compile sqlite_step sqlite_finalize sqlite_progress_handler sqlite_reset sqlite_last_statement_changes

sqlite_step()在执行select时使用，因为查询到的结果可能会有多条，所以只要返回值是SQLITE_ROW，就要一直循环去获取结果；而sqlite3_exec()则是对insert、update，delete等执行后只影响数据库中的内容的操作时使用。 ...

如果既不想写回调函数，又想避免 sqlite3_get_table之后麻烦的一维数组遍历，那么利用sqlite3_prepare_v2执行sql select语句，让后sqlite3_step遍历select执行的返回结果是一个非常方便的solution. 当然，你必须要明白sqlite3_prepare_v2不仅仅能够执行table的query selection，也能方便地进行sql Delete, Insert, Update等其他一些操作。它能帮你把sql语句的执行操作变的更加优雅。 i...

如果既不想写回调函数，又想避免sqlite3_get_table之后麻烦的一维数组遍历，那么利用sqlite3_prepare_v2执行sql select语句，让后sqlite3_step遍历select执行的返回结果是一个非常方便的solution. 当然，你必须要明白sqlite3_prepare_v2不仅仅能够执行table的query selection，也能方便地进行sql Del

CGI

2,204

社区成员

4,518

社区内容

发帖

与我相关

我的任务

社区管理员

加入社区

近7日
近30日
至今

加载中

查看更多榜单

社区公告

暂无公告

试试用AI创作助手写篇文章吧

+ 用AI写文章