108 lines
3.9 KiB
Java
108 lines
3.9 KiB
Java
package com.learn.entity;
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import com.baomidou.mybatisplus.annotation.IdType;
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import com.baomidou.mybatisplus.annotation.TableField;
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import com.baomidou.mybatisplus.annotation.TableId;
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import com.baomidou.mybatisplus.annotation.TableName;
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import jakarta.persistence.*;
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import jakarta.validation.constraints.*;
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import java.time.LocalDateTime;
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/**
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* 学生实体 —— 同时兼容 JPA 和 MyBatis-Plus
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*
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* 对比观察：
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* @Entity (JPA) ↔ @TableName (MP) —— 声明这是一个表映射类
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* @Table (JPA) ↔ @TableName (MP) —— 指定对应的表名
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* @Id (JPA) ↔ @TableId (MP) —— 主键
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* @GeneratedValue (JPA) ↔ @TableId(type=...) (MP) —— 主键生成策略
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* @Column (JPA) ↔ @TableField (MP) —— 字段映射
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*
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* 注意：JPA 和 MP 的注解可以共存于同一个实体类上，互不冲突。
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* 因为它们分属不同的框架，各自读取各自的注解。
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*/
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@Entity
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@Table(name = "student")
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@TableName("student") // MP 注解：指定表名
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public class Student {
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@Id
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@GeneratedValue(strategy = GenerationType.IDENTITY) // JPA：数据库自增
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@TableId(type = IdType.AUTO) // MP：数据库自增
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private Long id;
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@NotBlank(message = "姓名不能为空")
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@Size(min = 1, max = 20, message = "姓名长度 1-20")
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@Column(name = "name", length = 20, nullable = false)
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@TableField("name") // MP 注解（当字段名=列名时可省略，此处显式写出便于学习）
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private String name;
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@Min(value = 1, message = "年龄必须大于 0")
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@Max(value = 150, message = "年龄必须小于 150")
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@Column(name = "age", nullable = false)
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@TableField("age")
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private int age;
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@NotBlank(message = "邮箱不能为空")
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@Email(message = "邮箱格式不正确")
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@Column(name = "email", length = 50, nullable = false)
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@TableField("email")
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private String email;
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@Min(value = 0, message = "成绩不能为负数")
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@Max(value = 100, message = "成绩不能超过 100")
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@Column(name = "score", nullable = false)
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@TableField("score")
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private int score;
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// ---- 审计字段（由数据库自动管理）----
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@Column(name = "create_time", insertable = false, updatable = false)
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@TableField("create_time")
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private LocalDateTime createTime;
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@Column(name = "update_time", insertable = false, updatable = false)
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@TableField("update_time")
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private LocalDateTime updateTime;
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// ==================== 构造方法 ====================
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public Student() {}
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public Student(Long id, String name, int age, String email, int score) {
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this.id = id;
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this.name = name;
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this.age = age;
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this.email = email;
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this.score = score;
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}
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// ==================== Getter / Setter ====================
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public Long getId() { return id; }
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public void setId(Long id) { this.id = id; }
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public String getName() { return name; }
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public void setName(String name) { this.name = name; }
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public int getAge() { return age; }
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public void setAge(int age) { this.age = age; }
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public String getEmail() { return email; }
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public void setEmail(String email) { this.email = email; }
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public int getScore() { return score; }
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public void setScore(int score) { this.score = score; }
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public LocalDateTime getCreateTime() { return createTime; }
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public void setCreateTime(LocalDateTime createTime) { this.createTime = createTime; }
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public LocalDateTime getUpdateTime() { return updateTime; }
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public void setUpdateTime(LocalDateTime updateTime) { this.updateTime = updateTime; }
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@Override
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public String toString() {
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return String.format("Student{id=%d, name='%s', age=%d, email='%s', score=%d}",
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id, name, age, email, score);
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}
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}
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