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基于Annotation的关系映射 前期准备:

基于映射文件共享主键方式实现一对一：

基于映射文件唯一外键式实现一对一：

1、共享主键方式:

 

Person:

@Entity@Table(name = "person", catalog = "hibernate")public class Person implements java.io.Serializable {	private Integer id;	private String name;	private IdCard idCard;	public Person() {	}	@Id	@GeneratedValue	@Column(name = "id", unique = true, nullable = false)	public Integer getId() {		return this.id;	}	public void setId(Integer id) {		this.id = id;	}	@Column(name = "name", nullable = false, length = 45)	public String getName() {		return this.name;	}	public void setName(String name) {		this.name = name;	}	@OneToOne(cascade = CascadeType.ALL)	@PrimaryKeyJoinColumn // 这个注解只能写在主(生成ID)的一端,指向从表	public IdCard getIdCard() {		return idCard;	}	public void setIdCard(IdCard idCard) {		this.idCard = idCard;	}}

 

 

IdCard:

@Entity@Table(name = "id_card", catalog = "hibernate")public class IdCard implements java.io.Serializable {	private Integer id;	private Person person;	private String cardNo;	public IdCard() {	}	@Id	@GenericGenerator(name = "abc", strategy = "foreign", parameters = { @Parameter(name = "property", value = "person") })	@GeneratedValue(generator = "abc")	@Column(name = "id", unique = true, nullable = false)/*      与映射文件相比较：         
    			
     			
     				
      person			
     		
    */	public Integer getId() {		return this.id;	}	public void setId(Integer id) {		this.id = id;	}	@OneToOne(cascade = CascadeType.ALL)	@JoinColumn(name = "id", unique = true, nullable = false, insertable = false, updatable = false)	public Person getPerson() {		return this.person;	}	public void setPerson(Person person) {		this.person = person;	}	@Column(name = "card_no", nullable = false, length = 45)	public String getCardNo() {		return this.cardNo;	}	public void setCardNo(String cardNo) {		this.cardNo = cardNo;	}}

 

测试与使用和基于映射文件基本一样：

2、唯一外键方式

Person:

@Entity@Table(name = "person", catalog = "hibernate")public class Person implements java.io.Serializable {	private Integer id;	private String name;	private IdCard idCard;	public Person() {	}	@Id	@GeneratedValue	@Column(name = "id", unique = true, nullable = false)	public Integer getId() {		return this.id;	}	public void setId(Integer id) {		this.id = id;	}	@Column(name = "name", nullable = false, length = 45)	public String getName() {		return this.name;	}	public void setName(String name) {		this.name = name;	}	@OneToOne(cascade = CascadeType.ALL,mappedBy="person")     //
      与之前的映射文件比较    //当指定person中的mappedBy后,关系只能被idcard来主动维护	public IdCard getIdCard() {		return idCard;	}	public void setIdCard(IdCard idCard) {		this.idCard = idCard;	}}

 

IdCard:

@Entity@Table(name = "id_card", catalog = "hibernate")public class IdCard implements java.io.Serializable {	private Integer id;	private Person person;	private String cardNo;	public IdCard() {	}	@Id	@GeneratedValue	@Column(name = "id", unique = true, nullable = false)	public Integer getId() {		return this.id;	}	public void setId(Integer id) {		this.id = id;	}	@OneToOne(cascade = CascadeType.ALL)	@JoinColumn(name = "person_id", unique = true)/*  比较：	
       */	public Person getPerson() {		return this.person;	}	public void setPerson(Person person) {		this.person = person;	}	@Column(name = "card_no", nullable = false, length = 45)	public String getCardNo() {		return this.cardNo;	}	public void setCardNo(String cardNo) {		this.cardNo = cardNo;	}}

测试与使用和基于映射文件基本一样：