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");
	}
}