Week 1-8: Spring Boot 学习计划完整项目

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

week3/src/main/java/com/learn/entity/Student.java

@@ -0,0 +1,107 @@
+package com.learn.entity;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableField;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import jakarta.persistence.*;
+import jakarta.validation.constraints.*;
+import java.time.LocalDateTime;
+
+/**
+ * 学生实体 —— 同时兼容 JPA 和 MyBatis-Plus
+ *
+ * 对比观察：
+ *   @Entity           (JPA)   ↔  @TableName        (MP)   —— 声明这是一个表映射类
+ *   @Table            (JPA)   ↔  @TableName        (MP)   —— 指定对应的表名
+ *   @Id               (JPA)   ↔  @TableId          (MP)   —— 主键
+ *   @GeneratedValue    (JPA)   ↔  @TableId(type=...) (MP)   —— 主键生成策略
+ *   @Column            (JPA)   ↔  @TableField       (MP)   —— 字段映射
+ *
+ * 注意：JPA 和 MP 的注解可以共存于同一个实体类上，互不冲突。
+ *       因为它们分属不同的框架，各自读取各自的注解。
+ */
+@Entity
+@Table(name = "student")
+@TableName("student")            // MP 注解：指定表名
+public class Student {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)  // JPA：数据库自增
+    @TableId(type = IdType.AUTO)                         // MP：数据库自增
+    private Long id;
+
+    @NotBlank(message = "姓名不能为空")
+    @Size(min = 1, max = 20, message = "姓名长度 1-20")
+    @Column(name = "name", length = 20, nullable = false)
+    @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）
+    private String name;
+
+    @Min(value = 1, message = "年龄必须大于 0")
+    @Max(value = 150, message = "年龄必须小于 150")
+    @Column(name = "age", nullable = false)
+    @TableField("age")
+    private int age;
+
+    @NotBlank(message = "邮箱不能为空")
+    @Email(message = "邮箱格式不正确")
+    @Column(name = "email", length = 50, nullable = false)
+    @TableField("email")
+    private String email;
+
+    @Min(value = 0, message = "成绩不能为负数")
+    @Max(value = 100, message = "成绩不能超过 100")
+    @Column(name = "score", nullable = false)
+    @TableField("score")
+    private int score;
+
+    // ---- 审计字段（由数据库自动管理）----
+    @Column(name = "create_time", insertable = false, updatable = false)
+    @TableField("create_time")
+    private LocalDateTime createTime;
+
+    @Column(name = "update_time", insertable = false, updatable = false)
+    @TableField("update_time")
+    private LocalDateTime updateTime;
+
+    // ==================== 构造方法 ====================
+
+    public Student() {}
+
+    public Student(Long id, String name, int age, String email, int score) {
+        this.id = id;
+        this.name = name;
+        this.age = age;
+        this.email = email;
+        this.score = score;
+    }
+
+    // ==================== Getter / Setter ====================
+
+    public Long getId() { return id; }
+    public void setId(Long id) { this.id = id; }
+
+    public String getName() { return name; }
+    public void setName(String name) { this.name = name; }
+
+    public int getAge() { return age; }
+    public void setAge(int age) { this.age = age; }
+
+    public String getEmail() { return email; }
+    public void setEmail(String email) { this.email = email; }
+
+    public int getScore() { return score; }
+    public void setScore(int score) { this.score = score; }
+
+    public LocalDateTime getCreateTime() { return createTime; }
+    public void setCreateTime(LocalDateTime createTime) { this.createTime = createTime; }
+
+    public LocalDateTime getUpdateTime() { return updateTime; }
+    public void setUpdateTime(LocalDateTime updateTime) { this.updateTime = updateTime; }
+
+    @Override
+    public String toString() {
+        return String.format("Student{id=%d, name='%s', age=%d, email='%s', score=%d}",
+                id, name, age, email, score);
+    }
+}