mybatis-spring整合总结05_Injecting Mappers

Injecting Mappers

DAO除了手动使用SqlSessionDaoSupport或是SqlSessionTemplate之外,Mybatis-Spring提供了另外一种方法，使用代理工厂—MapperFactoryBean。它允许你直接将map接口注入到Service beans中去，而不用编写实现类(DAOImpl)。因为Mybatis-Spring会为你创建代理。
将mapper加入Spring的配置方法:

<bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
 <property name="mapperInterface" value="org.mybatis.spring.sample.mapper.UserMapper" />
 <property name="sqlSessionFactory" ref="sqlSessionFactory" />
</bean>

MapperFactoryBean将自动创建一个实现了UserMapper的代理类并注入到应用中。因为是在运行时创建，所以Mapper必须是一个接口而不是实现类。

<bean id="fooService" class="org.mybatis.spring.sample.mapper.FooServiceImpl">
 <property name="userMapper" ref="userMapper" />
</bean>

public class FooServiceImpl implements FooService {
 private UserMapper userMapper;
 public void setUserMapper(UserMapper userMapper) {
 this.userMapper = userMapper;
}
 public User doSomeBusinessStuff(String userId) {
 return this.userMapper.getUser(userId);
}
}

Mybatis-Spring将会管理事务的commit,rollback,close