package org.drsoft.hibernate.model.oneToMany;

import java.util.Date;

import java.util.Set;

import javax.persistence.*;

@Entity

@Table(name = "OneToMany_One")

public class OneToManyForOneModel {

@Id

@Column(name = "Record_ID")

@GeneratedValue(strategy = GenerationType.IDENTITY)

private int recordID;

@Column(name = "Total_Trade_Amt")

private long totalTradeAmt;

@Column(name = "Modify_Time")

private Date modifyTime;

@Column(name = "Create_Time", insertable = false, updatable = false)

private Date createTime;

@OneToMany(cascade = {

CascadeType.PERSIST }, fetch = FetchType.LAZY, targetEntity = OneToManyForManyModel.class, orphanRemoval = false,mappedBy="oneToManyForOneModel")

private Set<OneToManyForManyModel> details;

省略setter和getter

}

package org.drsoft.hibernate.model.oneToMany;

import java.util.Date;

import javax.persistence.*;

@Entity

@Table(name = "OneToMany_Many")

public class OneToManyForManyModel {

@Id

@Column(name = "Detail_ID")

@GeneratedValue(strategy = GenerationType.IDENTITY)

private int detailID;

@Column(name = "Trade_Amt")

private long tradeAmt;

@Column(name = "Create_Time", insertable = false, updatable = false)

private Date createTime;

@ManyToOne

@JoinColumn(name = "Ref_Record_ID", referencedColumnName = "Record_ID")

private OneToManyForOneModel oneToManyForOneModel;

省略setter和getter

}

package org.drsoft.hibernate.manager.oneToMany;

import java.util.*;

import org.drsoft.hibernate.model.oneToMany.*;

import org.drsoft.utils.hibernateUtils;

import org.hibernate.Session;

import org.hibernate.Transaction;

public class OneToManyManager {

public static void main(String[] args) {

Session curSession = hibernateUtils.openSession();

Transaction curTransaction = null;

Calendar calendar = Calendar.getInstance(Locale.CHINA);

try {

System.out.println("#1 创建 One 和 Many数据");

// #1 创建 One 和 Many数据

OneToManyForOneModel oneToManyForOneModel = new OneToManyForOneModel();

long totalTradeAmt = 0;

for (int i = 0; i < 5; i++) {

OneToManyForManyModel oneToManyForManyModel = new OneToManyForManyModel();

oneToManyForManyModel.setTradeAmt(calendar.get(Calendar.SECOND) + i);

totalTradeAmt = totalTradeAmt + oneToManyForManyModel.getTradeAmt();

if (oneToManyForOneModel.getDetails() == null) {

oneToManyForOneModel.setDetails(new HashSet<OneToManyForManyModel>());

System.out.println("创建 HashSet<OneToManyForManyModel>()");

}

oneToManyForOneModel.getDetails().add(oneToManyForManyModel);

}

oneToManyForOneModel.setTotalTradeAmt(totalTradeAmt);

oneToManyForOneModel.setModifyTime(new Date());

curTransaction = hibernateUtils.beginTransaction(curSession);

curSession.persist(oneToManyForOneModel);

curTransaction.commit();

System.out.println("#2 查询 One 数据");

// #2 查询 One 数据

oneToManyForOneModel = (OneToManyForOneModel) curSession.load(OneToManyForOneModel.class, new Integer(1));

System.out.println("OneToManyForOneModel RecordID=" + oneToManyForOneModel.getRecordID()

+ "\tTotalTradeAmt=" + oneToManyForOneModel.getTotalTradeAmt());

Set<OneToManyForManyModel> details = oneToManyForOneModel.getDetails();

Iterator<OneToManyForManyModel> it = details.iterator();

while (it.hasNext()) {

OneToManyForManyModel obj = it.next();

System.out.println(

"OneToManyForManyModel DetailID=" + obj.getDetailID() + "\tTradeAmt=" + obj.getTradeAmt());

}

} catch (Exception e) {

if (curTransaction != null && curTransaction.isActive()) {

curTransaction.rollback();

}

throw e;

} finally {

if (curSession != null) {

curSession.close();

}

}

}

}