Hibernate – One-To-One Example (Annotation)

1. “One-to-one” table relationship

See the previous one to one table relationship again.

2. Hibernate Model Class

Create two model classes – Stock.java and StockDetail.java, and put the annotation code inside.

File : Stock.java

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) //注意设置id生成方式
	@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;
	}
 
}

File : StockDetail.java

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;
	}
 
}

3. Hibernate Configuration File

Puts annotated classes Stock.java and StockDetail.java in your Hibernate configuration file, and also MySQL connection details.

File : hibernate.cfg.xml

<?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>

4. Run It

Run it, Hibernate will insert a row into the STOCK table and a row into the STOCK_DETAIL table.

File : 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");
	}
}

原文地址：
http://www.mkyong.com/hibernate/hibernate-one-to-one-relationship-example-annotation/