Annocation 复合主键(实现2)

最新推荐文章于 2025-07-28 23:27:29 发布

xiaowei126ymhr

最新推荐文章于 2025-07-28 23:27:29 发布

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文章标签： string hibernate properties equals class object

本文链接：https://blog.youkuaiyun.com/xiaowei126ymhr/article/details/6213276

本文介绍了一个名为Teacher2的Java实体类，该类使用了Hibernate框架进行数据库映射。Teacher2类通过注解定义了与数据库表Teacher_2的对应关系，并实现了Serializable接口。主要属性包括firstName、lastName和zhicheng，其中firstName和lastName被共同指定为@Id标识符。

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package bean; import java.io.Serializable; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.Table; @Entity @Table(name="Teacher_2") public class Teacher2 implements Serializable { private String firstName; private String lastName; private String zhicheng; public Teacher2() { } @Column(name="zhi_cheng",length=4,nullable=true) public String getZhicheng() { return zhicheng; } public void setZhicheng(String zhicheng) { this.zhicheng = zhicheng; } @Id public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } @Id public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } @Override public boolean equals(Object obj) { return true; } @Override public int hashCode() { int result = 17; return result; } }

map multiple properties as @Id properties:

映射的组合属性用@Id

/*the identifier type is then the entity class itself and needs to be Serializable
标识类型则是类的本事，它自己必须实现Serializable接口
This approach is unfortunately not standard and only supported by Hibernate
这种方式标准,但不幸的是,只有hibernate冬眠*/