1.整合Mybatis

导入相关jar包

• junit

  • <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.11</version>
    </dependency>
    

• mybatis

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

• mysql数据库

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

• spring相关

  • <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.2.0.RELEASE</version>
    </dependency>
    
    <!--        spring操作数据库，还需要spring-jdbc-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.2.0.RELEASE</version>
    </dependency>
    

• aop织入

  • <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.4</version>
    </dependency>
    

• mybatis-spring

  • <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.2</version>
    </dependency>
    

• 偷懒Lombok

  • <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
    </dependency>
    

1.1Mybatis-spring

1.编写数据源配置（和mybatis的配置文件里面的内容一样）

<!--    DataSource:使用spring的数据源替换Mybatis的配置
        这里使用Spring提供的jdbc：org.springframework.jdbc.datasource-->
    <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="123456"/>
    </bean>

2.sqlSessionFactory

<!--    sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--        绑定数据源dataSource-->
        <property name="dataSource" ref="datasource"/>
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
<!--        绑定mybatis配置文件（非必要）,这样mabtis配置文件内容也可以一起使用了-->
<!--        <property name="configLocation" value="classpath:mybatis-config.xml"/>-->
    </bean>

3.sqlSessionTemplate

<!--    获取SqlSession，相当于mybatis中通过工具类获取SqlSession-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
<!--        只能使用构造器注入sqlSessionFactory因为它没有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{
    //之前的操作都要使用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到Spring

<!--    将写的接口实现类注入到spring-->
    <bean id="userMapper" class="mapper.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>

6.测试使用

@Test
public void test02() throws Throwable{
    ApplicationContext context = new ClassPathXmlApplicationContext("spring-dao.xml");
    UserMapper userMapper = context.getBean("userMapper", UserMapper.class);

    for (User user:
            userMapper.selectuser()) {
        System.out.println(user);
    }


}

1.2继承SqlSessionDaoSupport类实现

1.编写接口的实现类

 public class UserMapperImpl02 extends SqlSessionDaoSupport implements UserMapper{
 
     @Override
     public List<User> selectuser() {
         SqlSession sqlSession = getSqlSession();
         UserMapper mapper = sqlSession.getMapper(UserMapper.class);
         return mapper.selectuser();
     }
 }

• 继承SqlSessionDaoSupport类，就可以直接在类里面通过getSqlSession（）方法获取sqlsession，然后再获取mapper，再执行方法即可

2.按照第一种方法更改配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd">

<!--    DataSource:使用spring的数据源替换Mybatis的配置
        这里使用Spring提供的jdbc：org.springframework.jdbc.datasource-->
    <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="123456"/>
    </bean>
    
<!--    sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--        绑定数据源dataSource-->
        <property name="dataSource" ref="datasource"/>
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    </bean>
    
<!--    方式二-->
    <bean id="userMapper2" class="mapper.UserMapperImpl02">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>
</beans>

• 直接将获取sqlsession的步骤用继承来实现。