Question

Greetings all
In my spring application I will need to use hibernate with two different databases (PostgreSQL & MySQL) and I am not pretty good with configuration, so I need some guide about how to do so

I am using the following configuration for hibernate-postgresql

<bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">

        <property name="dataSource" ref="dataSource" />
        <property name="annotatedClasses">
            <list>
                <value>com.project.domain.myDomain</value>
            </list>

        </property>

        <property name="hibernateProperties">
            <value>
                hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect
            </value>
        </property>


    </bean>


    <bean id="dataSource"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">

        <property name="driverClassName" value="org.postgresql.Driver" />

        <property name="url">
        <value>${db.url}</value> 
        </property>

        <property name="username" > 
        <value>${db.username}</value>
        </property>

        <property name="password">  
        <value>${db.password}</value>
        </property>

    </bean>

    <bean id="transactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>

    <bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>

    <bean
        class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />

and in the DAO I make an autowire for the sessionFactory.

Answer 1

The only way is to have to Data Sources with their one stack (SessionFactory, Hibernate Template, ect.). Then you can inject the HIbernate Tempolate you want to use in you business classes (or both if you want to access both DB at same time).

here is an example DAO with explicit config

…

<bean id="db2SessionFactory"
    class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
...
</bean>

<bean id="db1Dao" class="ch.sbb.uno.dao.hibernate.UnoHibernateDaoSupport" scope="prototype">
    <property name="sessionFactory" ref="db1SessionFactory" />  
</bean>

<bean id="db2Dao" class="ch.sbb.uno.dao.hibernate.UnoHibernateDaoSupport" scope="prototype">
    <property name="sessionFactory" ref="db2SessionFactory" />  
</bean>