MybatisPlus实现简单增删改查功能
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实现步骤：
工具：IDEA
数据库版本：mysql5.7
一、环境搭建
1.创建springboot项目
pom.xml
2.pom.xml : spring web、lombok mysql
<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <scope>runtime</scope> <optional>true</optional> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies>
3.添加mybatisplus依赖
<dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.3.1.tmp</version> </dependency>
application.properties
4.application.properties配置文件：用户名、密码、连接驱动、配置日志
注意：mysql8 需要增加时区的配置 serverTimezone=GMT%2B8 东八区
#mysql5 驱动不同 spring.datasource.username=root spring.datasource.password=123456 spring.datasource.url=jdbc:mysql://localhost:3306/mybatisplus?useSSL=false&useUnicode=true&characterEncoding=utf-8 spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver #配置日志 mybatis-plus.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl
数据库数据
#建表 DROP TABLE IF EXISTS user; CREATE TABLE user ( id BIGINT(20) NOT NULL COMMENT '主键ID', name VARCHAR(30) NULL DEFAULT NULL COMMENT '姓名', age INT(11) NULL DEFAULT NULL COMMENT '年龄', email VARCHAR(50) NULL DEFAULT NULL COMMENT '邮箱', PRIMARY KEY (id) ); #插入数据 DELETE FROM user; INSERT INTO user (id, name, age, email) VALUES (1, 'Jone', 18, 'test1@baomidou.com'), (2, 'Jack', 20, 'test2@baomidou.com'), (3, 'Tom', 28, 'test3@baomidou.com'), (4, 'Sandy', 21, 'test4@baomidou.com'), (5, 'Billie', 24, 'test5@baomidou.com');
代码详解
1.新建实体类User
lombok注解详解：
@Data：自动生成get\set方法
@AllArgsConstructor ：有参方法
@NoArgsConstructor：无参方法
@TableId(value = “id”,type = IdType.AUTO) ：给实体设置自增
package com.sh.entity;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.context.annotation.Primary;
import java.util.Date;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
@TableId(value = "id",type = IdType.AUTO)
private Integer id;
private String name;
private Integer age;
private String email;
private Date createTime;
private Date updateTime;
}
2. 新建mapper包
在mapper包里建UserMappe接口r 继承BaseMapper<实体类>
package com.sh.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.sh.entity.User;
import org.springframework.stereotype.Repository;
@Repository
public interface UserMapper extends BaseMapper<User> {
}
3.创建控制层controller：
新建UserController类
package com.sh.controller;
import com.sh.entity.User;
import com.sh.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
@RestController
public class UserController {
@Autowired
private UserMapper userMapper;
//查询 查询所以 null 就是没有条件
@GetMapping("/selectUser")
public List<User> getAll(){
List<User> user = userMapper.selectList(null);
return user;
}
//根据id查询
@GetMapping("/selectById")
public User selectUserById(){
User user = userMapper.selectById(1);
return user;
}
//根据多个id查询 Arrays.asList集合
@GetMapping("/selectByIds")
public List<User> selectUserByIds(){
List<User> user = userMapper.selectBatchIds(Arrays.asList(1,2,3));
return user;
}
//添加
@PostMapping("/insertUser")
public Integer insertUsers(User user){
Integer result = userMapper.insert(user);
return result;
}
//修改 根据id
@PutMapping("/updateUser")
public Integer updateUsers(User user){
Integer result = userMapper.updateById(user);
return result;
}
//删除 根据id
@DeleteMapping("/deleteUser")
public Integer deleteUsers(Integer id){
Integer result = userMapper.deleteById(id);
return result;
}
}
项目结构
注意：添加，修改操作需要数据库和实体设置自增
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