Hibernate映射问题之OneToOne【自己整理】

首先贴上一个MkYong的例子

stock.java

 package com.mkyong.stock;

 import javax.persistence.CascadeType;
 import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.FetchType;
 import javax.persistence.GeneratedValue;
 import static javax.persistence.GenerationType.IDENTITY;
 import javax.persistence.Id;
 import javax.persistence.OneToOne;
 import javax.persistence.Table;
 import javax.persistence.UniqueConstraint;

 @Entity
 @Table(name = "stock", catalog = "mkyongdb", uniqueConstraints = {
         @UniqueConstraint(columnNames = "STOCK_NAME"),
         @UniqueConstraint(columnNames = "STOCK_CODE") })
 public class Stock implements java.io.Serializable {

     private Integer stockId;
     private String stockCode;
     private String stockName;
     private StockDetail stockDetail;

     public Stock() {
     }

     public Stock(String stockCode, String stockName) {
         this.stockCode = stockCode;
         this.stockName = stockName;
     }

     public Stock(String stockCode, String stockName, StockDetail stockDetail) {
         this.stockCode = stockCode;
         this.stockName = stockName;
         this.stockDetail = stockDetail;
     }

     @Id
     @GeneratedValue(strategy = IDENTITY)
     @Column(name = "STOCK_ID", unique = true, nullable = false)
     public Integer getStockId() {
         return this.stockId;
     }

     public void setStockId(Integer stockId) {
         this.stockId = stockId;
     }

     @Column(name = "STOCK_CODE", unique = true, nullable = false, length = 10)
     public String getStockCode() {
         return this.stockCode;
     }

     public void setStockCode(String stockCode) {
         this.stockCode = stockCode;
     }

     @Column(name = "STOCK_NAME", unique = true, nullable = false, length = 20)
     public String getStockName() {
         return this.stockName;
     }

     public void setStockName(String stockName) {
         this.stockName = stockName;
     }

     @OneToOne(fetch = FetchType.LAZY, mappedBy = "stock", cascade = CascadeType.ALL)
     public StockDetail getStockDetail() {
         return this.stockDetail;
     }

     public void setStockDetail(StockDetail stockDetail) {
         this.stockDetail = stockDetail;
     }

 }

StockDetail.java

 package com.mkyong.stock;

 import java.util.Date;
 import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.FetchType;
 import javax.persistence.GeneratedValue;
 import javax.persistence.Id;
 import javax.persistence.OneToOne;
 import javax.persistence.PrimaryKeyJoinColumn;
 import javax.persistence.Table;
 import javax.persistence.Temporal;
 import javax.persistence.TemporalType;
 import org.hibernate.annotations.GenericGenerator;
 import org.hibernate.annotations.Parameter;

 @Entity
 @Table(name = "stock_detail", catalog = "mkyongdb")
 public class StockDetail implements java.io.Serializable {

     private Integer stockId;
     private Stock stock;
     private String compName;
     private String compDesc;
     private String remark;
     private Date listedDate;

     public StockDetail() {
     }

     public StockDetail(Stock stock, String compName, String compDesc,
             String remark, Date listedDate) {
         this.stock = stock;
         this.compName = compName;
         this.compDesc = compDesc;
         this.remark = remark;
         this.listedDate = listedDate;
     }

     @GenericGenerator(name = "generator", strategy = "foreign",
     parameters = @Parameter(name = "property", value = "stock"))
     @Id
     @GeneratedValue(generator = "generator")
     @Column(name = "STOCK_ID", unique = true, nullable = false)
     public Integer getStockId() {
         return this.stockId;
     }

     public void setStockId(Integer stockId) {
         this.stockId = stockId;
     }

     @OneToOne(fetch = FetchType.LAZY)
     @PrimaryKeyJoinColumn
     public Stock getStock() {
         return this.stock;
     }

     public void setStock(Stock stock) {
         this.stock = stock;
     }

     @Column(name = "COMP_NAME", nullable = false, length = 100)
     public String getCompName() {
         return this.compName;
     }

     public void setCompName(String compName) {
         this.compName = compName;
     }

     @Column(name = "COMP_DESC", nullable = false)
     public String getCompDesc() {
         return this.compDesc;
     }

     public void setCompDesc(String compDesc) {
         this.compDesc = compDesc;
     }

     @Column(name = "REMARK", nullable = false)
     public String getRemark() {
         return this.remark;
     }

     public void setRemark(String remark) {
         this.remark = remark;
     }

     @Temporal(TemporalType.DATE)
     @Column(name = "LISTED_DATE", nullable = false, length = 10)
     public Date getListedDate() {
         return this.listedDate;
     }

     public void setListedDate(Date listedDate) {
         this.listedDate = listedDate;
     }

 }

<?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");
	}
}