整合Mybatis

步骤

1. 导入相关jar包
   junit
   mybatis
   mysql数据库
   spring相关
   aop织入
   mybatis-spring

2. 编写配置文件
3. 测试

回忆Mybatis

1. 编写实体类
2. 编写核心配置文件
3. 编写接口
4. 编写Mapper.xml
5. 测试

Mybatis-Spring

方式一

1. 编写数据源配置

<!--DataSource:使用Spring的数据源替换Mybatis的配置-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>
        <property name="username" value="root"/>
        <property name="password" value="Dominus0825."/>
    </bean>

2. sqlSessionFactory

<!--SqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
<!--修改Mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="mapperLocations" value="classpath:mapper/UserMapper.xml"/>
    </bean>

3. sqlSessionTemplate

<!--SqlSessionTemplate:就是我们使用的sqlSqssion-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
<!--只能使用构造器注入sqlSessionFactory，因为没有set方法-->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>

4. 需要给接口加实现类

public class UserMapperImpl implements UserMapper{
    //我们的所有操作，在原来都是用sqlSession来执行，现在都使用SqlSessionTemplate
    private SqlSessionTemplate sqlSession;

    public void setSqlSession(SqlSessionTemplate sqlSession) {
        this.sqlSession = sqlSession;
    }

    @Override
    public List<User> selectUser() {
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        return mapper.selectUser();
    }
}

5. 将自己写的实现类，注入Spring中

    <bean id="userMapper" class="com.god.dao.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>

6. 测试

public class MyTest {
    @Test
    public void test() throws IOException {
        ApplicationContext context = new ClassPathXmlApplicationContext("spring-dao.xml");
        UserMapper userMapper = (UserMapper) context.getBean("userMapper");
        for (User user : userMapper.selectUser()) {
            System.out.println(user);
        }
    }
}

方式二

SqlSessionDaoSupport

1. 编写数据源配置

<!--DataSource:使用Spring的数据源替换Mybatis的配置-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>
        <property name="username" value="root"/>
        <property name="password" value="Dominus0825."/>
    </bean>

2. sqlSessionFactory

<!--SqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
<!--修改Mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="mapperLocations" value="classpath:mapper/UserMapper.xml"/>
    </bean>

3. 总配置文件

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           https://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/context
                           https://www.springframework.org/schema/context/spring-context.xsd">

    <import resource="spring-dao.xml"/>
    <bean id="userMapper2" class="com.god.dao.UserMapperImpl2">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>
</beans>

4. 实体类

public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper{
    @Override
    public List<User> selectUser() {
        return getSqlSession().getMapper(UserMapper.class).selectUser();
    }
}

<User.java><UserMapper.java><UserMapper.xml><spring-dao.xml><userMapperImpl2.java><applicationContext.xml><MyTest.java>