Spring_整合Mybatis

1、导入相关jar包

• junit

• mybatis

• mysq数据库

• Spring相关的

• aop织入

• mybatis-spring 【new】

<dependency>
    <groupId>mysqlgroupId>
    <artifactId>mysql-connector-javaartifactId>
    <version>8.0.16version>
dependency>
<dependency>
    <groupId>junitgroupId>
    <artifactId>junitartifactId>
    <version>4.12version>
dependency>

<dependency>
    <groupId>org.mybatisgroupId>
    <artifactId>mybatisartifactId>
    <version>3.5.2version>
dependency>



<dependency>
    <groupId>org.springframeworkgroupId>
    <artifactId>spring-webmvcartifactId>
    <version>5.2.0.RELEASEversion>
dependency>


<dependency>
    <groupId>org.springframeworkgroupId>
    <artifactId>spring-jdbcartifactId>
    <version>5.2.0.RELEASEversion>
dependency>


<dependency>
    <groupId>org.aspectjgroupId>
    <artifactId>aspectjweaverartifactId>
    <version>1.9.4version>
dependency>

<dependency>
    <groupId>org.mybatisgroupId>
    <artifactId>mybatis-springartifactId>
    <version>2.0.2version>
dependency>

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

1. 编写数据源配置

2. sqlSessionFactory

3. sqlSessionTemplate

   （前三步都是配置文件）

   ApplicationConte.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: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"/>


beans>

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">


<configuration>

    <typeAliases>
        <typeAlias type="com.ly.pojo.User" alias="User"/>
    typeAliases>



    


configuration>

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: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">


    
    <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/mybatistext?useSSL=true&useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT"/>
        <property name="username" value="root"/>
        <property name="password" value="ly0825"/>
    bean>
    
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="mapperLocations" value="classpath:com/ly/mapper/*.xml"/>
    bean>
    
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">

        <constructor-arg index="0" ref="sqlSessionFactory"/>
    bean>
    <bean id="userMapper" class="com.ly.mapper.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"/>
    bean>

beans>

4.需要给接口加实现类

UserMapperImpl.java

package com.ly.mapper;

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

import java.util.List;

public class UserMapperImpl implements UserMapper{
    //我们原来所有的操作，都是用sqlSession来执行，现在都使用SqlSessionTemplate
    private SqlSessionTemplate sqlSession;

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

    public List getUserList() {
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        return mapper.getUserList();
    }
}

UserMapper.java(接口)

package com.ly.mapper;

import com.ly.pojo.User;

import java.util.List;

public interface UserMapper {
    //获取全部用户
    public  List getUserList();
}

UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
        DOCTYPE mapper
                PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
                "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.ly.mapper.UserMapper">

    <select id="getUserList" resultType="User">
        select * from user
    select>
    

mapper>

User.java【实体类】

package com.ly.pojo;

import lombok.Data;

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


}

5.将自己写的实现类注入到Spring中即可；

第二种整合方式：

package com.ly.mapper;

import com.ly.pojo.User;
import org.apache.ibatis.session.SqlSession;
import org.mybatis.spring.support.SqlSessionDaoSupport;

import java.util.List;

//mybatis plus 精简版 不需要在配置文件中配置sqlSession，接口实现类不需要注入sqlSession
// 但是需要继承SqlSessionDaoSupport，需要注入sqlSessionFactory，将其交给父类，让其给我们生成sqlSession，我们只需要调用getSqlSession方法
public class UserMapperImplTwo extends SqlSessionDaoSupport implements UserMapper{


    public List getUserList() {
        SqlSession sqlSession = getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List userList = mapper.getUserList();
        return userList;
    }
}