[Java][服务器][MyBatis-Plus] MyBatisPlus的CRUD 添加和主键生成策略

一、insert

1、插入操作

    //添加操作
    @Test
    public void addUser() {
        User user = new User();
        user.setName("岳不群1");
        user.setAge(70);
        user.setEmail("[email protected]");

        int insert = userMapper.insert(user);
        System.out.println("insert:"+insert);
    }

执行日志输出结果 Parameters: 1249545169748951041(Long), 岳不群1(String), 70(Integer), [email protected](String)

1249545169748951041是MP自动生成的

Creating a new SqlSession
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@4ab550d5] was not registered for synchronization because synchronization is not active
JDBC Connection [HikariProxyConnection@999674172 wrapping com.mysql.cj.jdbc.ConnectionImpl@3730ab42] will not be managed by Spring
==>  Preparing: INSERT INTO user ( id, name, age, email ) VALUES ( ?, ?, ?, ? ) 
==> Parameters: 1249545169748951041(Long), 岳不群1(String), 70(Integer), [email protected](String)
<==    Updates: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@4ab550d5]
insert:1

2、主键策略

（1）ID_WORKER

MyBatis-Plus默认的主键策略是：ID_WORKER  全局唯一ID

参考资料：分布式系统唯一ID生成方案汇总：https://www.cnblogs.com/haoxinyue/p/5208136.html

 

 

@Data
public class User {

    //@TableId(type = IdType.ID_WORKER) //mp自带策略，生成19位值，数字类型使用这种策略，比如long
    //@TableId(type = IdType.ID_WORKER_STR) //mp自带策略，生成19位值，字符串类型使用这种策略
    private Long id;

    private String name;
    private Integer age;
    private String email;
}