1. 导入依赖
首先新建一个springboot项目，勾选组件时勾选Spring Web、JDBC API、MySQL Driver
然后导入以下整合依赖
<!— https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter —>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.3</version>
</dependency>
2. 连接数据库
数据库代码：
— 创建数据库
CREATE DATABASE springboot;
— 使用springboot数据库
use springboot;
— 创建user表
CREATE TABLE IF NOT EXISTS `user`(
`id` INT(4) NOT NULL AUTO_INCREMENT COMMENT 身份号,
`name` VARCHAR(30) NOT NULL DEFAULT 匿名 COMMENT 姓名,
`pwd` VARCHAR(30) NOT NULL DEFAULT 123456 COMMENT 密码,
PRIMARY KEY (`id`)
)ENGINE=INNODB DEFAULT CHARSET=utf8
— 给user表插入数据
INSERT INTO `user`(`id`,`name`,`pwd`)
VALUES (1,zsr,000204),(2,gcc,000421),(3,BaretH,200024);
然后IDEA连接数据库
打开我们创建的数据库springboot
对应的user表
3. 编写数据库配置信息
在springboot配置文件中配置数据库信息
spring.datasource.username=root
spring.datasource.password=200024
spring.datasource.url=jdbc:mysql://localhost:3306/springboot?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
4. 编写pojo实体类
在主程序同级目录下新建pojo包，其中新建User实体类（使用了lombok）
package com.zsr.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
int id;
String name;
String password;
}
5. 编写mapper接口
在主程序同级目录下新建mapper包，其中新建UserMapper接口
package com.zsr.mapper;
import com.zsr.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;
import java.util.List;
@Mapper //表示这是Mybatis的mapper类
@Repository
public interface UserMapper {
List<User> queryUserList();
User queryUserByID(int id);
int addUser(User user);
int updateUser(User user);
int deleteUser(int id);
}
6. 编写mapper.xml
在resources目录下新建mabatis包，其中新建mapper包，再在其中新建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.zsr.mapper.UserMapper”>
<select id=“queryUserList” resultType=“user”>
select * from user
</select>
<select id=“queryUserByID” resultType=“user”>
select * from user 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>
7. 编写controller
在主程序同级目录下新建controller包，在其中新建UserController
package com.zsr.controller;
import com.zsr.mapper.UserMapper;
import com.zsr.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> users = userMapper.queryUserList();
return users;
}
@GetMapping(“/queryUserByID”)
public User queryUserByID() {
User user = userMapper.queryUserByID(2);
return user;
}
@GetMapping(“/addUser”)
public String addUser() {
userMapper.addUser(new User(4, “zml”, “45632”));
return “增加用户完毕”;
}
@GetMapping(“/updateUser”)
public String updateUser() {
userMapper.updateUser(new User(4, “zml”, “678910”));
return “修改用户完毕”;
}
@GetMapping(“/deleteUser”)
public String deleteUser() {
userMapper.deleteUser(4);
return “删除用户完毕”;
}
}
8. 测试
测试访问http://localhost:8080/queryUserList
测试访问http://localhost:8080/queryUserByID
测试访问http://localhost:8080/addUser
测试访问http://localhost:8080/updateUser
测试访问http://localhost:8080/deleteUser
