SqlSessionFactoryBean

In base MyBatis, the SqlSessionFactory is built using SqlSessionFactoryBuilder. In MyBatis-Spring, SqlSessionFactoryBean is used instead.

Setup

To create the factory bean, put the following in the Spring XML configuration file:

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
  <property name="dataSource" ref="dataSource" />
</bean>

Note that SqlSessionFactoryBean implements Spring's FactoryBean interface (see section 3.8 of the Spring documentation). This means that the bean Spring ultimately creates is not the SqlSessionFactoryBean itself, but what the factory returns as a result of the getObject() call on the factory. In this case, Spring will build an SqlSessionFactory for you at application startup and store it with the name sqlSessionFactory . In Java, the equivalent code would be:

SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
SqlSessionFactory sessionFactory = factoryBean.getObject();

In normal MyBatis-Spring usage, you will not need to use SqlSessionFactoryBean or the corresponding SqlSessionFactory directly. Instead, the session factory will be injected into MapperFactoryBeans or other DAOs that extend SqlSessionDaoSupport .

Properties

SqlSessionFactory has a single required property, the JDBC DataSource . This can be any DataSource and should be configured just like any other Spring database connection.

One common property is configLocation which is used to specify the location of the MyBatis XML configuration file. One case where this is needed is if the base MyBatis configuration needs to be changed. Usually this will be <settings> or <typeAliases> sections.

Note that this config file does not need to be a complete MyBatis config. Specifically, any environments, data sources and MyBatis transaction managers will be ignored . SqlSessionFactoryBean creates its own, custom MyBatis Environment with these values set as required.

Another reason to require a config file is if the MyBatis mapper XML files are not in the same classpath location as the mapper classes. With this configuration, there are two options. This first is to manually specify the classpath of the XML files using a <mappers> section in the MyBatis config file. A second option is to use the mapperLocations property of the factory bean.

The mapperLocations property takes a list of resource locations. This property can be used to specify the location of MyBatis XML mapper files. The value can contain Ant-style patterns to load all files in a directory or to recursively search all paths from a base location. For example:

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
  <property name="dataSource" ref="dataSource" />
  <property name="mapperLocations" value="classpath*:sample/config/mappers/**/*.xml" />
</bean>

This will load all the MyBatis mapper XML files in the sample.config.mappers package and its sub-packages from the classpath.

One property that may be required in an environment with container managed transactions is transactionFactoryClass . Please see the relevant section in the Transactions chapter.

In case you are using the multi-db feature you will need to set the databaseIdProvider property:

      
<bean id="vendorProperties" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
    <property name="properties">
        <props>
            <prop key="SQL Server">sqlserver</prop>
            <prop key="DB2">db2</prop>
            <prop key="Oracle">oracle</prop>
            <prop key="MySQL">mysql</prop>
        </props>
    </property>
</bean>

<bean id="databaseIdProvider" class="org.apache.ibatis.mapping.VendorDatabaseIdProvider">
    <property name="properties" ref="vendorProperties"/>
</bean>

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="mapperLocations" value="classpath*:sample/config/mappers/**/*.xml" />
    <property name="databaseIdProvider" ref="databaseIdProvider"/>
</bean>

NOTE Since 1.3.0, configuration property has been added. It can be specified a Configuration instance directly without MyBatis XML configuration file. For example:

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
  <property name="dataSource" ref="dataSource" />
  <property name="configuration">
    <bean class="org.apache.ibatis.session.Configuration">
      <property name="mapUnderscoreToCamelCase" value="true"/>
    </bean>
  </property>
</bean>