为什么在hibernate中factory = new Configuration().configure().buildSessionFactory();会这么慢

[gks_cn]

有没有解决方法没有？
代码如下：
factory = new Configuration().configure().buildSessionFactory();
配置文件如下：
<hibernate-configuration>
<session-factory name="foo">
<mapping resource="struts/advinfo/db/Advisor.hbm.xml"/>
<mapping resource="sys/bm/Duty.hbm.xml"/>
<mapping resource="struts/message/bo/Accessories.hbm.xml"/>
<mapping resource="struts/message/bo/Body.hbm.xml"/>
<mapping resource="struts/message/bo/Send.hbm.xml"/>
</session-factory>
</hibernate-configuration>

[dkmilk]

初始化很慢是正常现像，可以写成plug，在服务器起动时初始化，

[gks_cn]

如何写？有没有相关资料和例子？

[jianghuxing]

public class IntializtionServlet extends HttpServlet {
public void init() throws ServletException {
try {
..........................
factory = new Configuration().configure().buildSessionFactory();
System.out.println("数据库初始化成功");
} catch (HibernateException e) {
e.printStackTrace();
System.out.println("数据库初始化失败");
}
}

然后在web.xml中加：
<servlet>
<servlet-name>CongressConfigInit</servlet-name>
<servlet-class>
XXX.IntializtionServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>

[gks_cn]

这个不能治本。主要是调试的时候暴慢。受不了了。

[gks_cn]

行，可是启动服务器的时候变慢了。

[ChDw]

在运行的时候快吗？

还有就是你的XML中声明的DTD版本和hibernate的版本匹配吗？

[gks_cn]

我用的hb3。0。但是配置
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd">

<hibernate-configuration>
<session-factory name="foo">
<mapping resource="struts/advinfo/db/Advisor.hbm.xml"/>
<mapping resource="sys/bm/Duty.hbm.xml"/>
<mapping resource="struts/message/bo/Accessories.hbm.xml"/>
<mapping resource="struts/message/bo/Body.hbm.xml"/>
<mapping resource="struts/message/bo/Send.hbm.xml"/>
</session-factory>
</hibernate-configuration>
没有下到3。0的配置摸班

[gks_cn]

问题解决了。是因为2。0的dtd和3。0的包不匹配造成的。

[bestdelphier]

我也初学hibernate，但是我写的程序没有这个问题，up&mark。

[jianghuxing]

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd">

<hibernate-configuration>
<session-factory>
<!-- local connection properties -->
<property name="hibernate.connection.url">
jdbc:mysql://192.168.1.90/db_congress?useUnicode=true&characterEncoding=gbk
</property>
<property name="hibernate.connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password" />
<!-- property name="hibernate.connection.pool_size"></property -->
<!-- dialect for MySQL -->
<property name="dialect">
net.sf.hibernate.dialect.MySQLDialect
</property>
<property name="hibernate.show_sql">false</property>
<property name="hibernate.use_outer_join">true</property>
<property name="hibernate.transaction.factory_class">
net.sf.hibernate.transaction.JDBCTransactionFactory
</property>
<mapping resource="com/netec/congress/model/TbSysVocation.hbm" />
<mapping resource="com/netec/congress/model/TbDeputyBaseinfo.hbm" />
<mapping resource="com/netec/congress/model/TbSysMeetingtype.hbm" />
<mapping resource="com/netec/congress/model/TbSysVotezone.hbm" />
<mapping resource="com/netec/congress/model/TbMeetingdoc.hbm" />
<mapping resource="com/netec/congress/model/TbSysClan.hbm" />
<mapping resource="com/netec/congress/model/TbSysDegree.hbm" />
<mapping resource="com/netec/congress/model/TbMeeting.hbm" />
<mapping resource="com/netec/congress/model/TbAgendaitem.hbm" />
<mapping resource="com/netec/congress/model/TbDeputation.hbm" />
<mapping resource="com/netec/congress/model/TbSysNation.hbm" />
<mapping resource="com/netec/congress/model/TbSysMeetingdoctype.hbm" />
<mapping resource="com/netec/congress/model/TbSysPeriod.hbm" />
<mapping resource="com/netec/congress/model/TbDeputyExtendinfo.hbm" />
<mapping resource="com/netec/congress/model/TbSysConfig.hbm" />
<mapping resource="com/netec/congress/model/TbAuditpersonInfo.hbm" />
<mapping resource="com/netec/congress/model/TbSysAuditsort.hbm" />
</session-factory>
</hibernate-configuration>

[jianghuxing]

public static void initialize (String configFileName) throws HibernateException {
if (null == configFileName && sessionFactoryMap.size() > 0) return;
else if (null != sessionFactoryMap.get(configFileName)) return;
else {
Configuration cfg = new Configuration();
if (null == configFileName)
cfg.configure();
else
cfg.configure(configFileName);
setSessionFactory(configFileName, cfg.buildSessionFactory());
}
}

/**
* Set the session factory
*/
protected static void setSessionFactory (SessionFactory sessionFactory) {
setSessionFactory((String) null, sessionFactory);
}

/**
* Set the session factory
*/
protected static void setSessionFactory (String configFileName, SessionFactory sessionFactory) {
sessionFactoryMap.put(configFileName, sessionFactory);
}

/**
* Return the SessionFactory that is to be used by these DAOs. Change this
* and implement your own strategy if you, for example, want to pull the SessionFactory
* from the JNDI tree.
*/
protected SessionFactory getSessionFactory() throws HibernateException {
return getSessionFactory (getConfigurationFileName());
}

private static SessionFactory getSessionFactory(String configFile) throws HibernateException {
if (sessionFactoryMap.size() == 1) return (SessionFactory) sessionFactoryMap.values().toArray()[0];
else {
SessionFactory sessionFactory = (SessionFactory) sessionFactoryMap.get(configFile);
if (null == sessionFactory)
if (null == configFile)
throw new RuntimeException("The session factory has not been initialized.");
else
throw new RuntimeException("The session factory for '" + configFile + "' has not been initialized.");
else
return sessionFactory;
}
}

/**
* Return a new Session object that must be closed when the work has been completed.
* @return the active Session
*/
protected Session getSession() throws HibernateException {
return createSession();
}

/**
* Return a new Session object that must be closed when the work has been completed.
* @return the active Session
*/
public static Session createSession() throws HibernateException {
return createSession(null);
}

/**
* Return a new Session object that must be closed when the work has been completed.
* @param configFile the config file must match the meta attribute "config-file" in the hibernate mapping file
* @return the active Session
*/
public static Session createSession(String configFile) throws HibernateException {
java.util.Stack sessionStack = (java.util.Stack) threadedSessions.get();
Session session = null;
if (null == sessionStack) {
sessionStack = new java.util.Stack();
threadedSessions.set(sessionStack);
}
if (sessionStack.size() > 0) {
Object[] arr = (Object[]) sessionStack.peek();
String cf = (String) arr[0];
if (null == cf) {
session = (Session) arr[1];
}
else if (null != cf && null != configFile) {
if (cf.equals(configFile)) session = (Session) arr[1];
}
if (null == session) {
session = getSessionFactory(configFile).openSession();
arr = new Object[2];
arr[0] = configFile;
arr[1] = session;
sessionStack.push(arr);
}
}
else {
session = getSessionFactory(configFile).openSession();
Object[] arr = new Object[2];
arr = new Object[2];
arr[0] = configFile;
arr[1] = session;
sessionStack.push(arr);
}
return session;
}

[gks_cn]

我用的是hibernate3。0，数据库连接是用的jndi。服务器是webshpere

[liubofan2004]

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[gks_cn]

控制台信息是：
05-4-12 12:03:34:703 CST] 3cc2d191 Environment I org.hibernate.cfg.Environment Hibernate 3.0
[05-4-12 12:03:34:703 CST] 3cc2d191 Environment I org.hibernate.cfg.Environment loaded properties from resource hibernate.properties: {hibernate.cglib.use_reflection_optimizer=true, hibernate.dialect=org.hibernate.dialect.OracleDialect, hibernate.show_sql=true, hibernate.connection.datasource=jdbc/OracleDs}
[05-4-12 12:03:34:703 CST] 3cc2d191 Environment I org.hibernate.cfg.Environment using CGLIB reflection optimizer
[05-4-12 12:03:34:703 CST] 3cc2d191 Environment I org.hibernate.cfg.Environment JVM does not support Statement.getGeneratedKeys()
[05-4-12 12:03:34:703 CST] 3cc2d191 Environment I org.hibernate.cfg.Environment JVM does not support LinkedHasMap, LinkedHashSet - ordered maps and sets disabled
[05-4-12 12:03:34:703 CST] 3cc2d191 Environment I org.hibernate.cfg.Environment using workaround for JVM bug in java.sql.Timestamp
[05-4-12 12:03:34:703 CST] 3cc2d191 Environment I org.hibernate.cfg.Environment using pre JDK 1.4 java.sql.Timestamp handling
[

[gks_cn]

我的服务器是用的jdk1。3是不是这个的问题？

[jianghuxing]

应当是这个问题，
还有你在初始化得到factory 是不是静态的？

[gks_cn]

是静态的。

[jianghuxing]

factory = new Configuration().configure(“初始化的配置文件”).buildSessionFactory();

还有，你是初始化的时候慢还是在运行的时候慢呢＞？？

[jianghuxing]

一般在初始化的时候就是慢些，hibernate要初始化很多东西，
如果是运行的时候慢，看年看你的session怎么了用了。是不是每次对数据库操作都要创建新的session

[gks_cn]

运行很快。初始化的时候很慢。