Spring整合Mybatis

一、回顾mybatis的编写程序

          步骤：

　　　　a、导入相关jar包

　　　　　　　　junit、mybatis、mysql数据库、spring相关的、aop织入、mybatis-spring<dependencies>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.2</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.23</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.6</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.4</version>
        </dependency>
        <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>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.6</version>
        </dependency>
　　　　

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.18</version>

</dependency>

    </dependencies>

　　　　b、编写配置文件

　　　　　　　　编写实体类、编写核心配置文件、编写接口、编写Mapper.xml、测试

　　　　c、测试

二、Spring整合mybatis第一种方式：

        使用：SqlSessionTemplate

 

　　1、编写数据源

　　2、创建sqlSessionFactory

　　3、sqlSessionTemplate

　　4、需要给接口加实现类

　　5、将自己写的实现类，注入到spring当中

　　6、测试

 

　　创建两个xml文件，

　　　　　　1、Spring-dap.xml：用于配置数据源，创建SqlSessionTemplate

<?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: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">
    <!--datasource:使用spring的数据源替换mybatis
     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?userUnicode=true;characterEncode=Utf-8"/>
        <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:mapper/mybatis-config.xml"/>  ：mybatis配置文件可以可不要
        <property name="mapperLocations" value="classpath:mapper/UserMapper.xml"/>
    </bean>
    <!--SqlSessionTemplate :就是我们使用的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>


</beans>

　　　　2、applicationContext.xml  ：把接口的实现类注入到spring当中去

<?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: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">
    <import resource="spring-dao.xml"/>
    <!---->
    <bean id="userMapper" class="com.zy.dap.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>

</beans>

　　　　3、实体类   user

package com.zy.pojo;

import lombok.Data;

@Data
public class User {
    private int id;
    private String name;
    private int age;
}

 

　　　　4、接口类

　　　　　　UserMapper

package com.zy.dap;

import com.zy.pojo.User;

import java.util.List;

public interface UserMapper {
    List<User> selectUser();
}

   　　　　   UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.zy.dap.UserMapper">
    <select id="selectUser" resultType="com.zy.pojo.User">
        select * from user;
    </select>
</mapper>

　　 　　　　UserMapperImpl

package com.zy.dap;

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

import java.util.List;

public class UserMapperImpl implements UserMapper{
    /*原本，我们都使用sqlSession来操作，现在都是使用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、测试

import com.zy.dap.UserMapper;
import com.zy.pojo.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.List;

public class MyTest {
    @Test
    public void test()  {
        ApplicationContext context=new ClassPathXmlApplicationContext("mapper/applicationContext.xml");  //注意放置xml文件的路径
        UserMapper userMapper = context.getBean("userMapper", UserMapper.class);
        List<User> users = userMapper.selectUser();
        for (User user : users) {
            System.out.println(user);
        }


    }
}

 三、Spring整合mybatis第二种方式：

　　　　使用：SqlSessionDaoSupport

　　　　有些配置文件和第一种方式是一样的，只是他们的接口实现的方法不同

1、实体类

package com.zy.pojo;

import lombok.Data;

@Data
public class User {
    private int id;
    private String name;
    private int age;
}

 

2、接口、接口实现类

package com.zy.dap;

import com.zy.pojo.User;

import java.util.List;

public interface UserMapper {
    List<User> selectUser();
}

 

package com.zy.dap;

import com.zy.pojo.User;

import org.mybatis.spring.support.SqlSessionDaoSupport;

import java.util.List;

public class UserMapper1Impl extends SqlSessionDaoSupport implements UserMapper{

    @Override
    public List<User> selectUser() {
      return getSqlSession().getMapper(UserMapper.class).selectUser();

    }
}

3、配置文件：在applicationContext添加

 <bean id="userMapper1" class="com.zy.dap.UserMapper1Impl">
       <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>

4、测试

public void test()  {
        ApplicationContext context=new ClassPathXmlApplicationContext("mapper/applicationContext.xml");
        UserMapper userMapper = context.getBean("userMapper1", UserMapper.class);
        List<User> users = userMapper.selectUser();
        for (User user : users) {
            System.out.println(user);
        }