hibernate数据源配置

如果用xml配置的话，那就写两个配置文件，可以不再用“hibernate.cfg.xml”做文件名，随便什么都可以，像“mysql.cfg.xml”或“sqlserver.xml”都行。用Configuration类获取SessionFactory的代码：


SessionFactory mysqlFactory = new Configuration().configure("mysql.cfg.xml").buildSessionFactory();

SessionFactory sqlserverFactory = new Configuration().configure("sqlserver.xml").buildSessionFactory();



如果你用spring，多数据库就更简单了，像这段代码可以完成所有配置：

<beans>
 <bean id="mysqlDS" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
 <property name="url">
 <value>jdbc:mysql://localhost:3306/test</value>
 </property>
 <property name="driverClassName">
 <value>org.gjt.mm.mysql.Driver</value>
 </property>
 <property name="username">
 <value>root</value>
 </property>
 <property name="password">
 <value>123456</value>
 </property>
 </bean>

 <bean id="mysqlFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
 <property name="dataSource">
 <ref local="mysqlDS"/>
 </property>
 <property name="hibernateProperties">
 <props>
 <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
 </props>
 </property>
 <property name="mappingResources">
 <list>
 <value>test.hbm.xml</value>
 </list>
 </property>
 </bean>

 <bean id="sqlserverDS" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
 <property name="url">
 <value>jdbc:odbc:test</value>
 </property>
 <property name="driverClassName">
 <value>sun.jdbc.odbc.JdbcOdbcDriver</value>
 </property>
 <property name="username">
 <value>root</value>
 </property>
 <property name="password">
 <value>123456</value>
 </property>
 </bean>

 <bean id="sqlserverFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
 <property name="dataSource">
 <ref local="sqlserverDS"/>
 </property>
 <property name="hibernateProperties">
 <props>
 <prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop>
 </props>
 </property>
 <property name="mappingResources">
 <list>
 <value>test.hbm.xml</value>
 </list>
 </property>
 </bean>

 .......

</beans>

hibernate和spring还有很多可行的配置，可以参考他们的references，有很详细地说明的。