Springboot 整合mybatis框架

一: 在pom.xml 中导入mybatis 和 mysql依赖

		<!--整合mybatis框架-->
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>2.1.1</version>
		</dependency>
		<!--mysql驱动-->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>

二: 编写application.yml配置

applicat.properties也可以.我用的yml

spring:
  datasource:
    username: root
    password: root
    url: jdbc:mysql://localhost:3306/saishiguanli?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC
    driver-class-name: com.mysql.cj.jdbc.Driver

#mybatis配置
mybatis:
  #指向实体类
  typeAliasesPackage: com.sizaif.emsdemo.pojo
  #编写的mapper的路径
  mapperLocations: classpath:mybatis/Mapper/*.xml
  #configLocation: classpath:/mybatis-config.xml

三:编写Mapper.xml 和Mapper接口层

接口层

package com.sizaif.emsdemo.mapper;

import com.sizaif.emsdemo.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import java.util.List;

// 这是mybaties 的Mapper类
@Mapper
@Repository
public interface UserMapper {


    List<User> queryUserList();

    User queryUserById(int id);

    int addUser(User user);

    int deleteUser(int id);

    int updateUser(User user);


}

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.sizaif.emsdemo.mapper.UserMapper">

    
    <select id="queryUserList" resultType="User">
        select * FROM saishiguanli.user;
    </select>
    <select id="queryUserById" resultType="User">
        select * from user where id = #{id}
    </select>

    <insert id="addUser" parameterType="User">
        insert into saishiguanli.user (uid,uname,upwd) values (#{uid},#{uname},#{upwd})
    </insert>

    <update id="updateUser" parameterType="User">
        update saishiguanli.user set uname=#{uname},upwd=#{upwd} where uid = #{uid}
    </update>

    <delete id="deleteUser" parameterType="int">
        delete from saishiguanli.user where uid = #{uid}
    </delete>
</mapper>

四:最后测试:

在controller下编写:

package com.sizaif.emsdemo.controller;

import com.sizaif.emsdemo.mapper.UserMapper;
import com.sizaif.emsdemo.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class UserController {

    @Autowired
    private UserMapper userMapper;

    @GetMapping("/queryUserList")
    public List<User> queryUserList()
    {
        List<User> userlist = userMapper.queryUserList();
        for (User user : userlist) {
            System.out.println(user);
        }
        return userlist;

    }
}