Mybatis与Spring三种整合方法

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。

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。
Spring配置文件:

<!-- 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>  

数据映射器UserMapper,代码如下:

public interface UserMapper {     
    @Select("SELECT * FROM user WHERE id = #{userId}")        
    User getUser(@Param("userId") long id);   
}  

dao接口类UserDao,代码如下:

public interface UserDao {   
    public User getUserById(User user);  
}  

dao实现类UserDaoImpl2,,代码如下:

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());      
    }  
}

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)。
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>

mybatis总配置文件sqlMapConfig.xml:

<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> 

实体类映射文件user.map.xml:

<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/> 

(4)dao层接口实现类UserDaoImpl:

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;      
    }
}

3、采用抽象类org.mybatis.spring.support.SqlSessionDaoSupport提供SqlSession。
(1)spring配置文件:

<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>  

(2) dao层接口实现类UserDaoImpl3:

public class UserDaoImpl3 extends SqlSessionDaoSupport implements UserDao {  
    public User getUserById(User user) {     
        return (User) getSqlSession().selectOne("com.xxt.ibatis.dbcp.domain.User.getUser", user);     
    } 
}