MybatisPlus自带生成策略(id值)

基于这篇博客

user类

package com.xiang.pojo;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.Date;

/**
 * Created by IntelliJ IDEA.
 * User: xiang
 * Date: 2021/10/21 2:50
 */

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
//    @TableId(type = IdType.ID_WORKER) //数字类型的id使用，当类型为Long时默认使用，生成19位的Id值，
    @TableId(type = IdType.ID_WORKER_STR)//字符串类型的id使用，需要写明注解，生成19位的Id值
    //同时需要设置数据库的字段id的类型为Bigint，因为int的长度只有11位
    private Long id;
    private String username;
    private String sex;
    private int age;
    private Date birthday;
}

参考网址

分布式系统唯一ID生成方案汇总

测试类

package com.xiang;

import com.xiang.mapper.UserMapper;
import com.xiang.pojo.User;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.List;

/**
 * Created by IntelliJ IDEA.
 * User: xiang
 * Date: 2021/10/21 16:02
 */
@SpringBootTest
public class GenerationStrategy {
    @Autowired
    UserMapper userMapper;

    @Test
    void intro() {
        User user = new User();
        user.setUsername("周某");
        user.setSex("男");
        int insert = userMapper.insert(user);
        if (insert > 0) {
            System.out.println("插入成功");
        } else {
            System.out.println("fail");
        }
        List<User> list = userMapper.selectList(null);
        for (User listUser : list) {
            System.out.println(listUser);
        }
    }
}

运行结果

JDBC Connection [HikariProxyConnection@1979825302 wrapping com.mysql.cj.jdbc.ConnectionImpl@48a0c8aa] will not be managed by Spring
==>  Preparing: INSERT INTO user ( id, username, sex, age ) VALUES ( ?, ?, ?, ? )
==> Parameters: 1451098975287668738(Long), 周某(String), 男(String), 0(Integer)
<==    Updates: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@29a98d9f]
插入成功
JDBC Connection [HikariProxyConnection@1985280051 wrapping com.mysql.cj.jdbc.ConnectionImpl@48a0c8aa] will not be managed by Spring
==>  Preparing: SELECT id,username,sex,age,birthday FROM user
==> Parameters: 
<==    Columns: id, username, sex, age, birthday
<==        Row: 1, xiang, 男, 18, 2021-10-03
<==        Row: 559, 小向, 男, 18, 2021-10-04
<==        Row: 602, admin, 女, 18, 2021-10-20
<==        Row: 603, testbox, 女, 18, 2021-10-02
<==        Row: 604, 小一, 男, 18, 2021-10-16
<==        Row: 605, 小二, 女, 18, null
<==        Row: 607, 小四, 女, 21, null
<==        Row: 609, 小五, 女, 0, null
<==        Row: 1451097869404868609, 向某, 男, 0, null
<==        Row: 1451098975287668738, 周某, 男, 0, null
<==      Total: 10