Java 如何为两个mysql和oracle定义routingdatasource？

我想为两个不同的数据库定义一个routingdatasource：mysql和oracle

<bean id="dataSourceTarget" class="com.test.common.RoutingDataSource">
    <property name="targetDataSources">
        <map key-type="com.test.common.DataSourceType">
            <entry key="MY_SQL" value-ref="mySqlDataSource"/>
            <entry key="ORACLE" value-ref="oracleDataSource"/>
        </map>
    </property>
    <property name="defaultTargetDataSource" ref="mySqlDataSource"/>
</bean>

<bean id="mySqlDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
      destroy-method="close">
    <property name="driverClass" value="${jdbc.driver.classname}" />
    <property name="jdbcUrl" value="${mysql.url}" />
    <property name="user" value="${mysql.username}" />
    <property name="password" value="${mysql.password}" />
</bean>

<bean id="oracleDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
      destroy-method="close">
    <property name="driverClass" value="oracle.jdbc.driver.OracleDriver" />
    <property name="jdbcUrl" value="${oracle.url}" />
    <property name="user" value="${oracle.user}" />
    <property name="password" value="${oracle.passw}" />
</bean>

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
            <prop key="hibernate.format_sql">true</prop>
            <prop key="hibernate.use_sql_comments">true</prop>
        </props>
    </property>
</bean>

我已经定义了以下config.xml

<bean id="dataSourceTarget" class="com.test.common.RoutingDataSource">
    <property name="targetDataSources">
        <map key-type="com.test.common.DataSourceType">
            <entry key="MY_SQL" value-ref="mySqlDataSource"/>
            <entry key="ORACLE" value-ref="oracleDataSource"/>
        </map>
    </property>
    <property name="defaultTargetDataSource" ref="mySqlDataSource"/>
</bean>

<bean id="mySqlDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
      destroy-method="close">
    <property name="driverClass" value="${jdbc.driver.classname}" />
    <property name="jdbcUrl" value="${mysql.url}" />
    <property name="user" value="${mysql.username}" />
    <property name="password" value="${mysql.password}" />
</bean>

<bean id="oracleDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
      destroy-method="close">
    <property name="driverClass" value="oracle.jdbc.driver.OracleDriver" />
    <property name="jdbcUrl" value="${oracle.url}" />
    <property name="user" value="${oracle.user}" />
    <property name="password" value="${oracle.passw}" />
</bean>

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
            <prop key="hibernate.format_sql">true</prop>
            <prop key="hibernate.use_sql_comments">true</prop>
        </props>
    </property>
</bean>

<bean id="dataSourceTarget" class="com.test.common.RoutingDataSource">
    <property name="targetDataSources">
        <map key-type="com.test.common.DataSourceType">
            <entry key="MY_SQL" value-ref="mySqlDataSource"/>
            <entry key="ORACLE" value-ref="oracleDataSource"/>
        </map>
    </property>
    <property name="defaultTargetDataSource" ref="mySqlDataSource"/>
</bean>

<bean id="mySqlDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
      destroy-method="close">
    <property name="driverClass" value="${jdbc.driver.classname}" />
    <property name="jdbcUrl" value="${mysql.url}" />
    <property name="user" value="${mysql.username}" />
    <property name="password" value="${mysql.password}" />
</bean>

<bean id="oracleDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
      destroy-method="close">
    <property name="driverClass" value="oracle.jdbc.driver.OracleDriver" />
    <property name="jdbcUrl" value="${oracle.url}" />
    <property name="user" value="${oracle.user}" />
    <property name="password" value="${oracle.passw}" />
</bean>

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
            <prop key="hibernate.format_sql">true</prop>
            <prop key="hibernate.use_sql_comments">true</prop>
        </props>
    </property>
</bean>

此外，我必须为会话定义方言。

---

但是如何根据它所使用的数据源来定义它呢？

路由数据源是您自己的类？我宁愿创建两个会话工厂，然后创建一个能够返回正确会话工厂的东西。请注意，一旦hibernate会话打开，它就会保持连接（这取决于配置，但通常是这样）。那么，如果您进行切换呢？是的，您是对的，RoutingDataSourse是我自己的类，它实现了AbstractRoutingDataSource。我可以实现“我的”RoutingSessionFactory，问题是操作的顺序是什么？我认为首先为事务注释路由DataSource，然后我可以从ThreadLocals:-）获取正确的会话工厂。谢谢

<bean id="dataSourceTarget" class="com.test.common.RoutingDataSource">
    <property name="targetDataSources">
        <map key-type="com.test.common.DataSourceType">
            <entry key="MY_SQL" value-ref="mySqlDataSource"/>
            <entry key="ORACLE" value-ref="oracleDataSource"/>
        </map>
    </property>
    <property name="defaultTargetDataSource" ref="mySqlDataSource"/>
</bean>

<bean id="mySqlDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
      destroy-method="close">
    <property name="driverClass" value="${jdbc.driver.classname}" />
    <property name="jdbcUrl" value="${mysql.url}" />
    <property name="user" value="${mysql.username}" />
    <property name="password" value="${mysql.password}" />
</bean>

<bean id="oracleDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
      destroy-method="close">
    <property name="driverClass" value="oracle.jdbc.driver.OracleDriver" />
    <property name="jdbcUrl" value="${oracle.url}" />
    <property name="user" value="${oracle.user}" />
    <property name="password" value="${oracle.passw}" />
</bean>

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
            <prop key="hibernate.format_sql">true</prop>
            <prop key="hibernate.use_sql_comments">true</prop>
        </props>
    </property>
</bean>