hibenrate(8)一对一对象关系

hibenrate(八)一对一对象关系
一、一对一单/双向外键关联(Annotation)
Annotation: @OneToOne @JoinColumn(name="")
XML:<many-to-one unique（单向）
           <many-to-one unique   <one-to-one property-ref(双向)
a)Husband.java

@Entitypublic class Husband {private int id;private Wife wief.........@Id@GeneratedValuepublic int getId() {return id;}@OneToOne@JoinColumn(name="wifeId")public Wife getWife() {return wife;}..........}

b)Wife.java

@Entitypublic class Wife {private int id;……………            @Id@GeneratedValuepublic int getId() {return id;}        //双向关联时加入：         //  private Husband husband;        // @OneToOne(mappedBy="wife")         // public Husband getHusband(){              return husband;;          }………………….}

注：凡是双向关联，必设：mappedBy



二、一对一单/双向主键关联(Annotation) (不重要)有bug
Annotation: @OneToOne@PrimaryKeyJoinColumn

a)Husband.java   Wife.java的设置一样

..............@OneToOne@PrimaryKeyJoinColumnpublic Wife getWife() {return wife;}...........

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