Rhythmk 学习 Hibernate 08 - Hibernate annotation 关联关系注解

时间：2022-04-03 08:58

@Entity public class article { @Id @GeneratedValue public Integer getArticleId() { return articleId; } ..... @OneToOne(cascade=CascadeType.ALL) @PrimaryKeyJoinColumn public articleContent getContent() { return content; } ...... } ?

@Entity public class articleContent { @Id @GeneratedValue public Integer getcId() { return cId; } .... }

　　执行保存生成两张无外键的独立表

@Entity public class article { @OneToOne(cascade=CascadeType.ALL) @JoinColumn(name="cid_fk") public articleContent getContent() { return content; } } @Entity public class articleContent { @OneToOne(mappedBy="articleContent") public article ArticleEntity; }

　　执行保存，生成两张表，同时article生成一个cid_fk字段关联 articleContent主键ID

@Entity public class article { @Id @GeneratedValue public Integer getArticleId() { return articleId; } @OneToOne(cascade=CascadeType.ALL) @JoinTable(name="article_content", joinColumns=@JoinColumn(name="aid"), inverseJoinColumns=@JoinColumn(name="aid_fk")) public articleContent getContent() { return content; } ...... }

　　生成三张表分别为：article，article_content，articlecontent 其中 article_content 分别生成两个外键具体参考等价建表语句：

CREATE TABLE `article_content` ( `aid_fk` int(11) DEFAULT NULL, `aid` int(11) NOT NULL, PRIMARY KEY (`aid`), KEY `FK_7pgn2vn8r1lpswmh5v2ix667s` (`aid_fk`), CONSTRAINT `FK_ebfc4cs1sishg6u8kwpvgqqj9` FOREIGN KEY (`aid`) REFERENCES `article` (`articleId`), CONSTRAINT `FK_7pgn2vn8r1lpswmh5v2ix667s` FOREIGN KEY (`aid_fk`) REFERENCES `articlecontent` (`cId`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;

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