本文主要介绍Spring与Mybatis三种常用整合方法,需要的整合架包是mybatis-spring.jar,可通过链接
http://code.google.com/p/mybatis/下载到。
1、采用数据映射器(MapperFactoryBean)的方式,不用写mybatis映射文件,采用注解方式提供相应的sql语句和输入参数。
(1)Spring配置文件:
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<!-- 引入jdbc配置文件 -->
<context:property-placeholder location= "jdbc.properties" />
<!--创建jdbc数据源 -->
<bean id= "dataSource" class = "org.apache.commons.dbcp.BasicDataSource" destroy-method= "close" >
<property name= "driverClassName" value= "${driver}" />
<property name= "url" value= "${url}" />
<property name= "username" value= "${username}" />
<property name= "password" value= "${password}" />
<property name= "initialSize" value= "${initialSize}" />
<property name= "maxActive" value= "${maxActive}" />
<property name= "maxIdle" value= "${maxIdle}" />
<property name= "minIdle" value= "${minIdle}" />
</bean>
<!-- 创建SqlSessionFactory,同时指定数据源-->
<bean id= "sqlSessionFactory" class = "org.mybatis.spring.SqlSessionFactoryBean" >
<property name= "dataSource" ref= "dataSource" />
</bean>
<!--创建数据映射器,数据映射器必须为接口-->
<bean id= "userMapper" class = "org.mybatis.spring.mapper.MapperFactoryBean" >
<property name= "mapperInterface" value= "com.xxt.ibatis.dbcp.dao.UserMapper" />
<property name= "sqlSessionFactory" ref= "sqlSessionFactory" />
</bean>
<bean id= "userDaoImpl2" class = "com.xxt.ibatis.dbcp.dao.impl.UserDaoImpl2" >
<property name= "userMapper" ref= "userMapper" />
</bean>
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(2)数据映射器UserMapper,代码如下:
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public interface UserMapper {
@Select ( "SELECT * FROM user WHERE id = #{userId}" )
User getUser( @Param ( "userId" ) long id);
}
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(3)dao接口类UserDao,代码如下:
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public interface UserDao {
public User getUserById(User user);
}
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(4)dao实现类UserDaoImpl2,,代码如下:
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public class UserDaoImpl2 implements UserDao {
private UserMapper userMapper;
public void setUserMapper(UserMapper userMapper) {
this .userMapper = userMapper;
}
public User getUserById(User user) {
return userMapper.getUser(user.getId());
}
}
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2、采用接口org.apache.ibatis.session.SqlSession的实现类org.mybatis.spring.SqlSessionTemplate。
mybatis中, sessionFactory可由SqlSessionFactoryBuilder.来创建。
MyBatis-Spring 中,使用了SqlSessionFactoryBean来替代。
SqlSessionFactoryBean有一个必须属性dataSource,另外其还有一个通用属性configLocation(用来指定mybatis的xml配置文件路径)。
(1)Spring配置文件:
<!-- 创建SqlSessionFactory,同时指定数据源-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<!-- 指定sqlMapConfig总配置文件,订制的environment在spring容器中不在生效-->
<property name="configLocation" value="classpath:sqlMapConfig.xml"/>
<!--指定实体类映射文件,可以指定同时指定某一包以及子包下面的所有配置文件,mapperLocations和configLocation有一个即可,当需要为实体类指定别名时,可指定configLocation属性,再在mybatis总配置文件中采用mapper引入实体类映射文件 -->
<!- - <property name="mapperLocations" value="classpath*:com/xxt/ibatis/dbcp/**/*.xml"/> -->
<bean>
(2)mybatis总配置文件sqlMapConfig.xml:
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<configuration>
<typeAliases>
<typeAlias type= "com.xxt.ibatis.dbcp.domain.User" alias= "User" />
</typeAliases>
<mappers>
<mapper resource= "com/xxt/ibatis/dbcp/domain/user.map.xml" />
</mappers>
</configuration>
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(3)实体类映射文件user.map.xml:
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<mapper namespace= "com.xxt.ibatis.dbcp.domain.User" >
<resultMap type= "User" id= "userMap" >
<id property= "id" column= "id" />
<result property= "name" column= "name" />
<result property= "password" column= "password" />
<result property= "createTime" column= "createtime" />
</resultMap>
<select id= "getUser" parameterType= "User" resultMap= "userMap" >
select * from user where id = #{id}
</select>
<mapper/>
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(4)dao层接口实现类UserDaoImpl:
Java代码
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public class UserDaoImpl implements UserDao {
public SqlSessionTemplate sqlSession;
public User getUserById(User user) {
return (User)sqlSession.selectOne( "com.xxt.ibatis.dbcp.domain.User.getUser" , user);
}
public void setSqlSession(SqlSessionTemplate sqlSession) {
this .sqlSession = sqlSession; }
}
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3、采用抽象类org.mybatis.spring.support.SqlSessionDaoSupport提供SqlSession。
(1)spring配置文件:
Java代码
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<bean id= "sqlSessionFactory" class = "org.mybatis.spring.SqlSessionFactoryBean" >
<property name= "dataSource" ref= "dataSource" />
<property name= "configLocation" value= "classpath:sqlMapConfig.xml" />
<!-- <property name= "mapperLocations" value= "classpath*:com/xxt/ibatis/dbcp/domain/user.map.xml" / > -->
</bean>
<bean id= "sqlSession" class = "org.mybatis.spring.SqlSessionTemplate" >
<constructor-arg index= "0" ref= "sqlSessionFactory" />
</bean>
<bean id= "userDaoImpl3" class = "com.xxt.ibatis.dbcp.dao.impl.UserDaoImpl3" >
<!--注入SqlSessionTemplate实例 -->
<property name= "sqlSessionTemplate" ref= "sqlSession" />
<!--也可直接注入SqlSessionFactory实例,二者都指定时,SqlSessionFactory失效 -->
<!-- <property name= "sqlSessionFactory" ref= "sqlSessionFactory" /> -->
</bean>
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(2) dao层接口实现类UserDaoImpl3:
Java代码
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public class UserDaoImpl3 extends SqlSessionDaoSupport implements UserDao {
public User getUserById(User user) {
return (User) getSqlSession().selectOne( "com.xxt.ibatis.dbcp.domain.User.getUser" , user);
}
}
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