使用annotation配置hibernate（3）：一对一关系配置

主键一对一

数据库表结构

Student.java

@Entity
@Table(name = "student")
public class Student {
    @Id
    @Column(name = "id")
    @GenericGenerator(name = "generator",strategy = "native")
    @GeneratedValue(generator = "generator")
    private int id;
    
    @Column(name = "name")
    private String name;
    
    @OneToOne(cascade=CascadeType.ALL)
    @PrimaryKeyJoinColumn//这个注解只能写在生成ID的一端
    private IDCard idCard;
    
}

IDCard.java

@Entity
@Table(name = "idcard")
public class IDCard {
    @Id
    @GenericGenerator(name = "fkgenerator",parameters = {@Parameter(name = "property",value = "student")}, strategy = "foreign")
    @GeneratedValue(generator = "fkgenerator")
    private int id;
    
    @Column(name = "num")
    private String num;
    
    @OneToOne(cascade=CascadeType.ALL,mappedBy = "idCard")
    private Student student;
}

外键一对一

数据库表结构

Student.java

@Entity
@Table(name = "student")
public class Student {
    @Id
    @Column(name = "id")
    @GenericGenerator(name = "generator",strategy = "uuid")
    @GeneratedValue(generator = "generator")
    private String id;
    
    @Column(name = "name")
    private String name;
        
    @OneToOne(cascade=CascadeType.ALL)
    @JoinColumn(name = "idcard")
    private IDCard idCard;
}

IDCard.java

@Entity
@Table(name = "idcard")
public class IDCard {
    @Id
    @Column(name = "id")
    @GenericGenerator(name = "generator",strategy = "uuid")
    @GeneratedValue(generator = "generator")
    private String id;
    
    @Column(name = "num")
    private String num;
    
    @OneToOne(mappedBy = "idCard")
    private Student student;
    
}