spring整合mybaties

整合思路
需要spring通過單例的方式管理sqlSessionFactory，
spring和mybaties整合生成代理對象，使用sqlSessionFactory創建sqlSession(spring和mybatis整合自動完成)，
持久層的mapper都需要由spring進行管理。

添加jar包：mybatis-spring-1.2.1.jar

配置applicationContext.xml:

<!-- sqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 加載mybatis配置文件 -->
        <property name="configLocation" value="/SqlMapConfig.xml"></property>
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 數據庫連接池 使用c3p0-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="user" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
        <property name="driverClass" value="${jdbc.driver}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
    </bean>
    <!-- 加載配置文件 -->
    <context:property-placeholder location="classpath:db.properties" />

userMapper.xml:

<select id="findUserById" parameterType="int" resultType="mybatis.po.User">
        select * from users where id=#{id}
    </select>

SqlMapConfig.xml:

<mappers >
    <!-- 加載映射文件 -->
        <mapper resource="sqlMap/User.xml"></mapper>
    </mappers>

dao接口實現類需要注入sqlSessionFactory,通過spring進行注入
dao接口實現類繼承SqlSessionDaoSupport

public class UserDaoImpl extends SqlSessionDaoSupport implements UserMapper {

    @Override
    public User findUserById(int id) throws Exception {
        //直接使用繼承類中的getSqlSession方法
        SqlSession sqlSession = this.getSqlSession();
        User user = sqlSession.selectOne("test.findUserById", id);
        //sqlSession.close();spring方法結束自動關閉釋放資源
        return user;
    }

在applicationContext.xml中配置dao:

<!-- sqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 加載mybatis配置文件 -->
        <property name="configLocation" value="/SqlMapConfig.xml"></property>
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 原始dao接口 -->
    <bean id="userDao" class="mybatis.dao.UserDaoImpl">
        <!-- 屬於父類的屬性 -->
        <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
    </bean>

測試類：

public class UserDaoImplTest2 {
    private ApplicationContext applicationContext;

    //setUp方法中得到spring容器,@Before註解  先執行
    @Before
    public void setUp() throws Exception {
        applicationContext = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
    }

    @Test
    public void test() throws Exception {
        UserMapper userdao = (UserMapper) applicationContext.getBean("userDao");
        User user = userdao.findUserById(1);
        System.out.println(user);
    }

}

Mapper代理開發
applicationContext.xml配置：

<!-- mapper配置 
    MapperFactoryBean:根據mapper接口生成代理對象-->
    <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
        <property name="mapperInterface" value="mybatis.dao.UserMapper"></property>
        <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
    </bean>