报错信息：

原因是将数据库表的id更改成了uid，之前表的主键为id

org.springframework.dao.DataIntegrityViolationException: 
### Error updating database.  Cause: java.sql.SQLException: Field 'uid' doesn't have a default value
### The error may exist in com/atguigu/mybatisplus/mapper/UserMapper.java (best guess)
### The error may involve com.atguigu.mybatisplus.mapper.UserMapper.insert-Inline
### The error occurred while setting parameters
### SQL: INSERT INTO t_user  ( name, age, email )  VALUES (  ?, ?, ?  )
### Cause: java.sql.SQLException: Field 'uid' doesn't have a default value
; Field 'uid' doesn't have a default value; nested exception is java.sql.SQLException: Field 'uid' doesn't have a default value
 

解决方式：

package com.atguigu.mybatisplus.pojo;

import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.*;

/**
 * ClassName: User
 * Package: com.atguigu.mybatisplus.pojo
 * Description:
 *
 * @Author: start
 * @Create 2025-12-07 17:16
 * @Version: 1.0
 */
//@NoArgsConstructor
//@AllArgsConstructor
//@Getter
//@Setter
//@EqualsAndHashCode
@Data
// 设置实体类所对应的表名
//@TableName("t_user")
public class User {
    // 将属性所对应的字段指定为主键
    @TableId
    private Long uid;
    private String name;
    private Integer age;
    private String email;

}