Hibernate映射问题之OneToOne【自己整理】

首先贴上一个MkYong的例子

stock.java

 1 package com.mkyong.stock;

 2  

 3 import javax.persistence.CascadeType;

 4 import javax.persistence.Column;

 5 import javax.persistence.Entity;

 6 import javax.persistence.FetchType;

 7 import javax.persistence.GeneratedValue;

 8 import static javax.persistence.GenerationType.IDENTITY;

 9 import javax.persistence.Id;

10 import javax.persistence.OneToOne;

11 import javax.persistence.Table;

12 import javax.persistence.UniqueConstraint;

13  

14 @Entity

15 @Table(name = "stock", catalog = "mkyongdb", uniqueConstraints = {

16         @UniqueConstraint(columnNames = "STOCK_NAME"),

17         @UniqueConstraint(columnNames = "STOCK_CODE") })

18 public class Stock implements java.io.Serializable {

19  

20     private Integer stockId;

21     private String stockCode;

22     private String stockName;

23     private StockDetail stockDetail;

24  

25     public Stock() {

26     }

27  

28     public Stock(String stockCode, String stockName) {

29         this.stockCode = stockCode;

30         this.stockName = stockName;

31     }

32  

33     public Stock(String stockCode, String stockName, StockDetail stockDetail) {

34         this.stockCode = stockCode;

35         this.stockName = stockName;

36         this.stockDetail = stockDetail;

37     }

38  

39     @Id

40     @GeneratedValue(strategy = IDENTITY)

41     @Column(name = "STOCK_ID", unique = true, nullable = false)

42     public Integer getStockId() {

43         return this.stockId;

44     }

45  

46     public void setStockId(Integer stockId) {

47         this.stockId = stockId;

48     }

49  

50     @Column(name = "STOCK_CODE", unique = true, nullable = false, length = 10)

51     public String getStockCode() {

52         return this.stockCode;

53     }

54  

55     public void setStockCode(String stockCode) {

56         this.stockCode = stockCode;

57     }

58  

59     @Column(name = "STOCK_NAME", unique = true, nullable = false, length = 20)

60     public String getStockName() {

61         return this.stockName;

62     }

63  

64     public void setStockName(String stockName) {

65         this.stockName = stockName;

66     }

67  

68     @OneToOne(fetch = FetchType.LAZY, mappedBy = "stock", cascade = CascadeType.ALL)

69     public StockDetail getStockDetail() {

70         return this.stockDetail;

71     }

72  

73     public void setStockDetail(StockDetail stockDetail) {

74         this.stockDetail = stockDetail;

75     }

76  

77 }

 

StockDetail.java

  1 package com.mkyong.stock;

  2  

  3 import java.util.Date;

  4 import javax.persistence.Column;

  5 import javax.persistence.Entity;

  6 import javax.persistence.FetchType;

  7 import javax.persistence.GeneratedValue;

  8 import javax.persistence.Id;

  9 import javax.persistence.OneToOne;

 10 import javax.persistence.PrimaryKeyJoinColumn;

 11 import javax.persistence.Table;

 12 import javax.persistence.Temporal;

 13 import javax.persistence.TemporalType;

 14 import org.hibernate.annotations.GenericGenerator;

 15 import org.hibernate.annotations.Parameter;

 16  

 17 @Entity

 18 @Table(name = "stock_detail", catalog = "mkyongdb")

 19 public class StockDetail implements java.io.Serializable {

 20  

 21     private Integer stockId;

 22     private Stock stock;

 23     private String compName;

 24     private String compDesc;

 25     private String remark;

 26     private Date listedDate;

 27  

 28     public StockDetail() {

 29     }

 30  

 31     public StockDetail(Stock stock, String compName, String compDesc,

 32             String remark, Date listedDate) {

 33         this.stock = stock;

 34         this.compName = compName;

 35         this.compDesc = compDesc;

 36         this.remark = remark;

 37         this.listedDate = listedDate;

 38     }

 39  

 40     @GenericGenerator(name = "generator", strategy = "foreign", 

 41     parameters = @Parameter(name = "property", value = "stock"))

 42     @Id

 43     @GeneratedValue(generator = "generator")

 44     @Column(name = "STOCK_ID", unique = true, nullable = false)

 45     public Integer getStockId() {

 46         return this.stockId;

 47     }

 48  

 49     public void setStockId(Integer stockId) {

 50         this.stockId = stockId;

 51     }

 52  

 53     @OneToOne(fetch = FetchType.LAZY)

 54     @PrimaryKeyJoinColumn

 55     public Stock getStock() {

 56         return this.stock;

 57     }

 58  

 59     public void setStock(Stock stock) {

 60         this.stock = stock;

 61     }

 62  

 63     @Column(name = "COMP_NAME", nullable = false, length = 100)

 64     public String getCompName() {

 65         return this.compName;

 66     }

 67  

 68     public void setCompName(String compName) {

 69         this.compName = compName;

 70     }

 71  

 72     @Column(name = "COMP_DESC", nullable = false)

 73     public String getCompDesc() {

 74         return this.compDesc;

 75     }

 76  

 77     public void setCompDesc(String compDesc) {

 78         this.compDesc = compDesc;

 79     }

 80  

 81     @Column(name = "REMARK", nullable = false)

 82     public String getRemark() {

 83         return this.remark;

 84     }

 85  

 86     public void setRemark(String remark) {

 87         this.remark = remark;

 88     }

 89  

 90     @Temporal(TemporalType.DATE)

 91     @Column(name = "LISTED_DATE", nullable = false, length = 10)

 92     public Date getListedDate() {

 93         return this.listedDate;

 94     }

 95  

 96     public void setListedDate(Date listedDate) {

 97         this.listedDate = listedDate;

 98     }

 99  

100 }

<?xml version="1.0" encoding="utf-8"?>

<!DOCTYPE hibernate-configuration PUBLIC

"-//Hibernate/Hibernate Configuration DTD 3.0//EN"

"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

 

<hibernate-configuration>

<session-factory>

    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>

    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/mkyongdb</property>

    <property name="hibernate.connection.username">root</property>

    <property name="hibernate.connection.password">password</property>

    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>

    <property name="show_sql">true</property>

    <mapping class="com.mkyong.stock.Stock" />

    <mapping class="com.mkyong.stock.StockDetail" />

</session-factory>

</hibernate-configuration>

　　然后是用于测试的App.java

package com.mkyong;

 

import java.util.Date;

 

import org.hibernate.Session;

 

import com.mkyong.stock.Stock;

import com.mkyong.stock.StockDetail;

import com.mkyong.util.HibernateUtil;

 

public class App {

	public static void main(String[] args) {

		System.out.println("Hibernate one to one (Annotation)");

		Session session = HibernateUtil.getSessionFactory().openSession();

 

		session.beginTransaction();

 

		Stock stock = new Stock();

 

		stock.setStockCode("7052");

		stock.setStockName("PADINI");

 

		StockDetail stockDetail = new StockDetail();

		stockDetail.setCompName("PADINI Holding Malaysia");

		stockDetail.setCompDesc("one stop shopping");

		stockDetail.setRemark("vinci vinci");

		stockDetail.setListedDate(new Date());

 

		stock.setStockDetail(stockDetail);

		stockDetail.setStock(stock);

 

		session.save(stock);

		session.getTransaction().commit();

 

		System.out.println("Done");

	}

}