Spring与Mybatis的整合方法有哪些
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:
<!-- 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>
(2)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); }
(3)dao接口类UserDao,代码如下:
public interface UserDao { public User getUserById(User user); }
(4)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)。
(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:
<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>
(3)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:
Java代码
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:
Java代码
<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:
Java代码
public class UserDaoImpl3 extends SqlSessionDaoSupport implements UserDao { public User getUserById(User user) { return (User) getSqlSession().selectOne("com.xxt.ibatis.dbcp.domain.User.getUser", user); } }