Hibernate configuring multiple datasources and multiple session factories

Question

I am using Spring and Hibernate the spring configuration is as below. How do i configure two data sources, session factories. The transaction is managed using annotations. Please advise

<!-- we can use annotations -->
<context:annotation-config/>

<!-- package to look for annotated classes -->
<context:component-scan base-package="com.XXX.XXX.service.impl"/>

<!-- we will manage transactions with annotations -->
<tx:annotation-driven/>


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

<!-- configure hibernate session factory -->

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
    destroy-method="close" p:driverClassName="com.microsoft.sqlserver.jdbc.SQLServerDriver"
    p:url="jdbc:sqlserver://DB_NAME\DB_INSTANCE:DB_PORT;databaseName=DB_NAME;username=DB_USER;password=DB_PASSWORD;" />

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
   <property name="dataSource" ref="dataSource" />
    <property name="configLocation">
            <value>classpath:hibernate.cfg.xml</value>
    </property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop>
            <prop key="hibernate.current_session_context_class">thread</prop>
            <prop key="show_sql">false</prop>
        </props>
    </property>

</bean>

Answer 1

<!-- configure hibernate session factory for FirstDB -->

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
    destroy-method="close" p:driverClassName="com.microsoft.sqlserver.jdbc.SQLServerDriver"
    p:url="jdbc:sqlserver://${FirstDB_DB_HosName}\${FirstDB_DB_instanceName}:${FirstDB_DB_PortNumber};databaseName=${FirstDB_DB_DatabaseName};username=${FirstDB_DB_UserName};password=${FirstDB_DB_Password};" />

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
   <property name="dataSource" ref="dataSource" />
    <property name="configLocation">
            <value>classpath:hibernate.cfg.xml</value>
    </property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop>
            <prop key="hibernate.current_session_context_class">thread</prop>
            <prop key="show_sql">false</prop>
        </props>
    </property>

</bean>


 <!-- configure hibernate session factory for SecondDB database -->

<bean id="SecondDBdataSource" class="org.apache.commons.dbcp.BasicDataSource"
    destroy-method="close" p:driverClassName="com.microsoft.sqlserver.jdbc.SQLServerDriver"
    p:url="jdbc:sqlserver://${SecondDB_DB_HOST}\${SecondDB_DB_INSTANCE}:${SecondDB_DB_PORT};databaseName=${SecondDB_DB_DATABASENAME};username=${SecondDB_DB_USERNAME};password=${SecondDB_DB_PASSWORD};" />


 <bean id="secondDBSessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
   <property name="dataSource" ref="SecondDBdataSource" />
    <property name="configLocation">
            <value>classpath:hibernate-SecondDB.cfg.xml</value>
    </property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop>
            <prop key="hibernate.current_session_context_class">thread</prop>
            <prop key="show_sql">false</prop>
        </props>
    </property> 

</bean>

In the Hibernate DAO we can use @Qualifier annotation as below to wire the 2 session factories

/**
 * Basic DAO operations dependent with Hibernate's specific classes
 * @see SessionFactory
 */
@Transactional(propagation= Propagation.REQUIRED, readOnly=false)
public class HibernateDao<E, K extends Serializable> implements GenericDao<E, K> {

  @Autowired
  @Qualifier(value="sessionFactory")
  private SessionFactory sessionFactory;

  @Autowired
  @Qualifier(value="secondDBSessionFactory")
  private SessionFactory secondDBSessionFactory;


  protected Class<? extends E> daoType;

  public HibernateDao() {
    daoType = (Class<E>) ((ParameterizedType) getClass().getGenericSuperclass())
                    .getActualTypeArguments()[0];
  }

  //Remaining Code
}

Answer 2

You can show that simple configuration in my project

 <context:component-scan base-package="it.dommy.portmaga" />

<context:property-placeholder location="default.properties" />

<!-- Enable annotation style of managing transactions -->
<tx:annotation-driven />

<context:annotation-config/>


<bean id="dataSource"class="com.mchange.v2.c3p0.ComboPooledDataSource"
      destroy-method="close" >
    <property name="driverClass" value="${db.driverClassName}" />
    <property name="jdbcUrl" value="${db.url}" />
    <property name="user" value="${db.username}" />
    <property name="password" value="${db.password}" />
</bean>
<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${hibernate.dialect}</prop>
            <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
            <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
            <prop key="hibernate.format_sql">${hibernate.format_sql}</prop>
            <prop key="hibernate.hbm2ddl.auto">create-drop</prop>
            <!--<prop key="hibernate.use_sql_comments">${hibernate.use_sql_comments}</prop>-->
            <!--<prop key="hibernate.validator.apply_to_ddl">${hibernate.validator.apply_to_ddl}</prop>-->
            <!--<prop key="hibernate.max_fetch_depth">${hibernate.max_fetch_depth}</prop>-->
            <!--<prop key="hibernate.default_batch_fetch_size">${hibernate.default_batch_fetch_size}</prop>-->
            <!--<prop key="hibernate.jdbc.batch_size">${hibernate.jdbc.batch_size}</prop>-->
            <!--<prop key="hibernate.validator.autoregister_listeners">true</prop>-->
            <!-- This will drop our existing database and re-create a new one. -->

        </props>
    </property>
    <property name="packagesToScan">
        <list>
            <value>it.dommy.portmaga.model.mysql</value>
        </list>
    </property>
</bean>

<bean id="secondDBdataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
      destroy-method="close">
<property name="driverClass" value="${dba.driverClassName}" />
<property name="jdbcUrl" value="${dba.url}" />
<property name="user" value="${dba.username}" />
<property name="password" value="${dba.password}" />
</bean>

<bean id="secondSessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="secondDBdataSource" />
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${hibernate.a.dialect}</prop>
            <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
        </props>
    </property>
    <property name="packagesToScan">
        <list>
            <value>it.dommy.portmaga.model.access</value>
        </list>
    </property>
</bean>

<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory" ref="secondSessionFactory" />

</bean>

if you wont show all project go here: https://bitbucket.org/dgabriele/portmaga