spring整合mybatis

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pom.xml中导入相关jar包

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.2</version>
    </dependency>

    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.47</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.3.5</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.3.4</version>
    </dependency>

    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.6</version>
    </dependency>

    <dependency>
        <groupId>com.spring</groupId>
        <artifactId>spring_mybatis</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
    
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.6</version>
    </dependency>
</dependencies>

方式一：

1.新建spring的配置文件spring-dao.xml

<?xml version="1.0" encoding="UTF-8"?>
<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"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd">

</beans>

2.配置dataSource数据源

<!--配置DataSource数据源：使用spring数据源替换mybatis的配置-->
<!--使用spring提供的jdbc:org.springframework.jdbc.datasource.DriverManagerDataSource-->
<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=false&amp;
                                    useUnicode=true&amp;characterEncoding=UTF-8"/>
    <property name="username" value="root"/>
    <property name="password" value="sundan"/>
</bean>

3.配置sqlSessionFactory对象

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
   <property name="dataSource" ref="dataSource" />
    <!--可以在这里绑定mybatis配置文件-->
   <property name="configLocation" value="classpath:mybatis-config.xml"/>
    <!--注册mapper.xml文件-->
   <property name="mapperLocations" value="classpath:com/spring/dao/UserMapper.xml"/>
</bean>

4.sqlSession的配置

<!--sqlSession的配置-->
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
    <!--只能使用构造器注入sqlSessionFactory:源码中没有set方法-->
    <constructor-arg index="0" ref="sqlSessionFactory"/>
</bean>

5.编写UserMapper实现类UserMapperImpl

public class UserMapperImpl implements UserMapper {
    
    private SqlSessionTemplate sqlSession;
    public void setSqlSession(SqlSessionTemplate sqlSession){
        this.sqlSession = sqlSession;
    }

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

6.将第五步中的UserMapperImpl 实现类注入到spring中

<!--将UserMapperImpl注入到spring中-->
<bean id="userMapper" class="com.spring.dao.UserMapperImpl">
    <property name="sqlSession" ref="sqlSession"/>
</bean>

7.测试

@Test
public void queryAllUsersTest() {
    ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring-dao.xml");
    UserMapper userMapper = applicationContext.getBean("userMapper", UserMapper.class);
    List<User> users = userMapper.queryAllUsers();
    for (User user : users) {
        System.out.println(user);
    }
}

方式二

使用SqlSessionDaoSupport用来提供 SqlSession。调用 getSqlSession() 方法得到一个 SqlSessionTemplate，之后可以用于执行 SQL 方法

省去了我们方式一中的第4步和第6步
需要继承SqlSessionDaoSupport类

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

<!--UserMapperImpl2注入到spring中-->
<bean id="userMapper2" class="com.spring.dao.UserMapperImpl2">
    <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>

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