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 [Hibernate]Using Hibernate with Tomcat
软件技术
lhwork 发表于 2006/8/20 11:36:39 |
| If you use Hibernate on Tomcat you don't have to use Tomcat's
JNDI-bound JDBC connections. You can let Hibernate manage the JDBC
connection pool. This works on all versions of Tomcat and is very easy
to configure.First, create a hibernate.cfg.xml or hibernate.properties file, as per documentation (no, property names in cfg.xml don't have to be prefixed with "hibernate.xxx"):
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><hibernate-configuration> <session-factory> <!-- Settings for a local HSQL (testing) database. --> <property name="dialect">org.hibernate.dialect.HSQLDialect</property> <property name="connection.driver_class">org.hsqldb.jdbcDriver</property> <property name="connection.url">jdbc:hsqldb:hsql://localhost</property> <property name="connection.username">sa</property> <property name="connection.password"></property> <!-- Use the C3P0 connection pool. --> <property name="c3p0.min_size">3</property> <property name="c3p0.max_size">5</property> <property name="c3p0.timeout">1800</property> <!-- Disable second-level cache. --> <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property> <property name="cache.use_query_cache">false</property> <property name="cache.use_minimal_puts">false</property> <property name="max_fetch_depth">3</property> <!-- Print SQL to stdout. --> <property name="show_sql">true</property> <property name="format_sql">true</property> <!-- Drop and then re-create schema on SessionFactory build, for testing. --> <property name="hbm2ddl.auto">create</property> <!-- Bind the getCurrentSession() method to the thread. --> <property name="current_session_context_class">thread</property> <!-- Hibernate XML mapping files --> <mapping resource="org/MyClass.hbm.xml"/> <!-- Hibernate Annotations (and package-info.java) <mapping package="org.mypackage"/> <mapping class="org.MyClass/> --> </session-factory></hibernate-configuration>Now copy this file into your WEB-INF/classes directory of your web application. Copy hibernate3.jar into your WEB-inf/lib
directory and with it all required 3rd party libraries (see
lib/README.txt in the Hibernate distribution). Don't forget to also
copy your JDBC driver to WEB-INF/lib. Never ever copy anything in Tomcat into a global directory outside of your web application or you are in classloader hell!Start Hibernate by building a SessionFactory, as shown here with HibernateUtil.This
listener initializes and closes Hibernate on deployment and
undeployment, instead of the first user request hitting the application:
public class HibernateListener implements ServletContextListener { public void contextInitialized(ServletContextEvent event) { HibernateUtil.getSessionFactory(); // Just call the static initializer of that class } public void contextDestroyed(ServletContextEvent event) { HibernateUtil.getSessionFactory().close(); // Free all resources }}Add it to your web.xml:
<listener> <listener-class>org.mypackage.HibernateListener</listener-class></listener> |
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