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=rootspring.datasource.password=123456spring.datasource.url=jdbc:mysql://localhost:3306/mybatisplus?useSSL=false&useUnicode=true&characterEncoding=utf-8spring.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Userlombok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@NoArgsConstructorpublic 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;@Repositorypublic 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;@RestControllerpublic 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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