目录

• 导入依赖
• 准备工作
  • 新建实体类
  • 新建mapper接口
  • 新建mapper.xml
  • 新建Mybatis核心配置文件
  • 新建mybatis-spring配置文件
• 新建Mapper实现类
• 到spring中注册实现类
• 测试

导入依赖

1.connector
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.26</version>
        </dependency>
2.mybatis
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
3.spring-jdbc
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.3.12</version>
        </dependency>
4.mybatis-spring
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.5</version>
        </dependency>

准备工作

新建实体类

新建mapper接口

新建mapper.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.wang.mapper.UserMapper">
    <select id="getUsers" resultType="com.wang.pojo.User">
        select * from mybatis1.user
    </select>
</mapper>

新建Mybatis核心配置文件

<?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>
       <package name="com.wang.pojo"/>
   </typeAliases>

</configuration>

新建mybatis-spring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">
<!--数据源-->
    <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/mybatis1?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">
        <!-- 加载 MyBatis 的配置文件 -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <!-- 数据源 -->
        <property name="dataSource" ref="dataSource"/>
        <!--注册mapper-->
        <property name="mapperLocations" value="classpath:com/wang/mapper/*Mapper.xml"/>
    </bean>
<!--sqlSessionTemplate-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>
</beans>

新建Mapper实现类

package com.wang.mapper;

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

import java.util.List;

public class UserMapperImpl implements UserMapper{
    private SqlSessionTemplate sqlsession;

    public void setSqlsession(SqlSessionTemplate sqlsession) {
        this.sqlsession = sqlsession;
    }

    @Override
    public List<User> getUsers() {
        return sqlsession.getMapper(UserMapper.class).getUsers();
    }
}

到spring中注册实现类

<!--    mapper实现类-->
    <bean id="userMapper" class="com.wang.mapper.UserMapperImpl">
        <property name="sqlsession" ref="sqlSession"/>
    </bean>

测试

    @Test
    public void test1(){
        ApplicationContext context = new ClassPathXmlApplicationContext("spring-dao.xml");
        UserMapper userMapper = (UserMapper) context.getBean("userMapper");
        List<User> users = userMapper.getUsers();
        for (User user : users) {
            System.out.println(user);
        }
    }

结果：