SpringBoot整合Mybatis（IDEA）

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Finish

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目录结构

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设计表

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application.properties配置文件

spring.datasource.username=root
spring.datasource.password=1234
spring.datasource.url=jdbc:mysql://localhost:3306/mydb?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

#整合mybatis
mybatis.type-aliases-package=com.cloud.pojo
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml

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创建pojo类

package com.cloud.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {

    private int id;
    private String name;
    private String pwd;

}

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Dao层

package com.cloud.mapper;

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

import java.util.List;

//这个注解表示了这是一个mybatis的mapper类：Dao
@Mapper
@Repository
public interface UserMapper {

    List<User> queryUserList();

    User queryUserById(int id);

    int addUser(User user);

    int updateUser(User user);

    int deleteUser(int id);
}

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.cloud.mapper.UserMapper">

    <select id="queryUserList" resultType="User">
        select * from user
    </select>
    
    <select id="queryUserById" resultType="User">
        select * from where id = #{id}
    </select>
    
    <insert id="addUser" parameterType="User">
        insert into user (id,name,pwd) values (#{id},#{name},#{pwd})
    </insert>

    <update id="updateUser" parameterType="User">
        update user set name=#{name},pwd=#{pwd} where id=#{id}
    </update>

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

</mapper>

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Controller层

package com.cloud.controller;

import com.cloud.mapper.UserMapper;
import com.cloud.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;
    }
    //剩下的方法自己完善

}

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