spring 和 mybatis 进行整合

参考文档自狂神笔记
步骤：
1.导入相关jar包
。junit
。mybatis
。mysql数据库
。spring相关的
。aop织入
。mybatis-spring【new】
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

官方文档

1.编写数据源

<?xml version="1.0" encoding="UTF8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       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">
    <!--DataSource : 使用Spring的数据源替换Mybatis的配置 c3p0 dbcp druid
    这里使用Spring提供的JDBC-->

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf8&amp;serverTimezone=Asia/Shanghai&amp;useSSL=false&amp;rewriteBatchedStatements=true"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>
    </beans>

2.sqlFactory

<?xml version="1.0" encoding="UTF8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       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">
    <!--DataSource : 使用Spring的数据源替换Mybatis的配置 c3p0 dbcp druid
    这里使用Spring提供的JDBC-->

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf8&amp;serverTimezone=Asia/Shanghai&amp;useSSL=false&amp;rewriteBatchedStatements=true"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>
    <!--sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!--绑定Mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="mapperLocations" value="classpath:com/zhou/mapper/*.xml"/>
     </bean>
</beans>

3.sqlSessionTemplate

<?xml version="1.0" encoding="UTF8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       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">
    <!--DataSource : 使用Spring的数据源替换Mybatis的配置 c3p0 dbcp druid
    这里使用Spring提供的JDBC-->

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf8&amp;serverTimezone=Asia/Shanghai&amp;useSSL=false&amp;rewriteBatchedStatements=true"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>
    <!--sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!--绑定Mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="mapperLocations" value="classpath:com/zhou/mapper/*.xml"/>
     </bean>
    <!--SqlSessionTemplate：就是我们使用的sqlSession
        只能使用构造器注入属性 sqlSessionFactory,因为它们有set方法-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"  >
         <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>
</beans>

4.需要给接口加实现类【】

<?xml version="1.0" encoding="UTF8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       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">
    <!--DataSource : 使用Spring的数据源替换Mybatis的配置 c3p0 dbcp druid
    这里使用Spring提供的JDBC-->

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf8&amp;serverTimezone=Asia/Shanghai&amp;useSSL=false&amp;rewriteBatchedStatements=true"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>
    <!--sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!--绑定Mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="mapperLocations" value="classpath:com/zhou/mapper/*.xml"/>
     </bean>
    <!--SqlSessionTemplate：就是我们使用的sqlSession
        只能使用构造器注入属性 sqlSessionFactory,因为它们有set方法-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"  >
         <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>
    <!---->
   <bean id="userMapper" class="com.zhou.mapper.UserMapperImpl">
       <property name="sqlSessionTemplate" ref="sqlSession"/>
   </bean>
</beans>

5.将自己写的实现类，注入到Spring中

package com.zhou.mapper;

import com.zhou.pojo.User;
import org.mybatis.spring.SqlSessionTemplate;

import java.util.List;

public class UserMapperImpl implements UserMapper{
    
    
//我们所有操作，都使用sqlSession来执行，在原来，现在都使用SqlSessionTemplate
    private SqlSessionTemplate sqlSessionTemplate;
    public void setSqlSessionTemplate(SqlSessionTemplate sqlSessionTemplate){
    
    
        this.sqlSessionTemplate=sqlSessionTemplate;
    }
    @Override
    public List<User> selectUser() {
    
    
        return sqlSessionTemplate.getMapper(UserMapper.class).selectUser();
    }
}

5.测试使用即可
上面是mybatis直接操作，下面是mybatis和spring整合之后的操作

    @Test
    public void test1() throws IOException {
    
    
        String resource="mybatis-config.xml";
        InputStream resourceAsStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(resourceAsStream);
        SqlSession sqlSession = build.openSession(true);
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<User> users = mapper.selectUser();
        for (User user : users) {
    
    
            System.out.println(user);
        }
    }
    @Test
    public void test2(){
    
    
        ClassPathXmlApplicationContext classPathXmlApplicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserMapperImpl userMapper = classPathXmlApplicationContext.getBean("userMapper", UserMapperImpl.class);
        List<User> users = userMapper.selectUser();
        for (User user : users) {
    
    
            System.out.println(user);
        }

    }

另外的写法接口的实现类去extends SqlSessionDaoSupport类
SqlSessionDaoSupport类中有getSqlSession()方法，用来获取SqlSession实例，当然在使用spring的Ioc,需要向中注入属性sqlSessionFactory
UserMapperImpl2.java

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

}

<?xml version="1.0" encoding="UTF8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       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">
     <import resource="spring-dao.xml"/>
    <!---->
    <bean id="userMapper" class="com.zhou.mapper.UserMapperImpl">
        <property name="sqlSessionTemplate" ref="sqlSession"/>
    </bean>
    <bean id="userMapper2" class="com.zhou.mapper.UserMapperImpl2">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>
</beans>

MyTest.java

    @Test
    public void test3(){
    
    
        ClassPathXmlApplicationContext classPathXmlApplicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserMapperImpl2 userMapper2 = classPathXmlApplicationContext.getBean("userMapper2", UserMapperImpl2.class);
        List<User> users = userMapper2.selectUser();
        for (User user : users) {
    
    
            System.out.println(user);
        }
    }

总结 : 整合到spring以后可以完全不要mybatis的配置文件，除了这些方式可以实现整合之外，我们还可以使用注解来实现，这个等后面学习SpringBoot的时候还会测试整合！