springboot如何对本地数据库增删改查_Springboot+MySQL实现数据库的增删改查
1、目录结构：
2、pom.xml文件：
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.3.3.RELEASE
com.leyou.demo
user-service-demo
0.0.1-SNAPSHOT
user-service-demo
Demo project for Spring Boot
1.8
org.springframework.boot
spring-boot-starter-data-jdbc
org.springframework.boot
spring-boot-starter-web
org.mybatis.spring.boot
mybatis-spring-boot-starter
mysql
mysql-connector-java
org.springframework.boot
spring-boot-starter-test
test
org.junit.vintage
junit-vintage-engine
tk.mybatis
mapper-spring-boot-starter
2.1.5
org.projectlombok
lombok
1.18.12
org.springframework.boot
spring-boot-maven-plugin
3、model实体类：package com.leyou.userservice.model;
import lombok.Data;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import java.io.Serializable;
import java.util.Date;
/**
* @ClassName: User
* @Description:
* @Author: q'j'j
* @Create: 2020-09-01 11:03
*/
@Table(name = "tb_user")
@Data
public class User implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String username;
private String password;
private Long phone;
private Date created;
}
4、Dao层，也叫mapper层package com.leyou.userservice.Dao;
import com.leyou.userservice.model.User;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface UserMapper extends tk.mybatis.mapper.common.Mapper{
}
5、service层package com.leyou.userservice.Service;
import com.leyou.userservice.Dao.UserMapper;
import com.leyou.userservice.model.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
/**
* @ClassName: UserService
* @Description:
* @Author: q'j'j
* @Create: 2020-09-01 11:33
*/
@Service
public class UserService {
@Autowired
private UserMapper userMapper;
public User queryById(Long id){
return this.userMapper.selectByPrimaryKey(id);
}
}
6、controller层package com.leyou.userservice.Controller;
import com.leyou.userservice.Service.UserService;
import com.leyou.userservice.model.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* @ClassName: UserController
* @Description:
* @Author: q'j'j
* @Create: 2020-09-01 11:33
*/
@RestController
@RequestMapping("user")
public class UserController {
@Autowired
private UserService userService;
@GetMapping("/{id}")
public User queryById(@PathVariable("id") Long id){
return this.userService.queryById(id);
}
}
7、配置文件：server:
port: 8081
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/yun6?characterEncoding=utf-8&serverTimezone=UTC
username: root
password: 1234
hikari:
maximum-pool-size: 20
minimum-idle: 10
mybatis:
type-aliases-package: com.leyou.userservice.model
8、MySQL数据库
(1)建表`DROP TABLE IF EXISTS `tb_user`;
CREATE TABLE `tb_user` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`username` varchar(50) NOT NULL COMMENT '用户名',
`password` varchar(32) NOT NULL COMMENT '密码，加密存储',
`phone` varchar(20) DEFAULT NULL COMMENT '注册手机号',
`created` datetime NOT NULL COMMENT '创建时间',
PRIMARY KEY (`id`),
UNIQUE KEY `username` (`username`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=28 DEFAULT CHARSET=utf8 COMMENT='用户表';
`
(2)插入数据``INSERT INTO `tb_user` VALUES ('16', 'huge', '1f8fe7059d1a86060f3a82bfcf2ea06e', '13688666688', '2018-04-29 16:31:35');
INSERT INTO `tb_user` VALUES ('17', 'leyou', '9ff12f364c1e1d576a6c031af17c6a2c', '13800880088', '2018-05-01 09:31:33');
INSERT INTO `tb_user` VALUES ('18', 'hehe', 'ec597888142eb7ae821a6bf3555ffc4f', '16888668866', '2018-05-01 09:35:29');
INSERT INTO `tb_user` VALUES ('19', 'haha', 'b1e2d0f363b8937b72056d39b933eed9', '18999999999', '2018-05-01 09:38:22');
INSERT INTO `tb_user` VALUES ('20', 'heihei', 'bffbff3726148ca20b8e1edbb96e7d02', '13888888888', '2018-05-01 09:38:39');
INSERT INTO `tb_user` VALUES ('21', 'hugege', '0760bf52d18804f9b1ba9ec2526f74db', '13600527634', '2018-05-01 18:23:46');
INSERT INTO `tb_user` VALUES ('27', 'liuyan', 'ee15b6016cd78661056c5701d6f343e7', '17623672016', '2018-05-01 18:25:30');`
9、启动查询
localhost:8081/user/17