Hibernate QBC与QBE

创建类

Categogy类
模块

package com.hibernate.model;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
public class Category {
	private int id;
	private String name;
	@Id
	@GeneratedValue
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
}

Topic类
主题

package com.hibernate.model;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;

@Entity
@NamedQueries(
		{
			@NamedQuery(name="topic.selectCertainTopic", query="from Topic t where t.id = :id")
		}
		)

public class Topic {
	private int id;
	private String title;
	private Category category;
	private Date createDate;
	private List<Msg> msgs = new ArrayList<Msg>();
	@OneToMany(mappedBy="topic")
	public List<Msg> getMsgs() {
		
		return msgs;
	}
	public void setMsgs(List<Msg> msgs) {
		this.msgs = msgs;
	}
	public Date getCreateDate() {
		return createDate;
	}
	public void setCreateDate(Date createDate) {
		this.createDate = createDate;
	}
	@ManyToOne(fetch=FetchType.LAZY)
	public Category getCategory() {
		return category;
	}
	public void setCategory(Category category) {
		this.category = category;
	}
	@Id
	@GeneratedValue
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getTitle() {
		return title;
	}
	public void setTitle(String title) {
		this.title = title;
	}
	
}

msg类

package com.hibernate.model;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToOne;

@Entity
public class Msg {
	private int id;
	private String cont;
	private Topic topic;
	@ManyToOne
	public Topic getTopic() {
		return topic;
	}
	public void setTopic(Topic topic) {
		this.topic = topic;
	}
	@Id
	@GeneratedValue
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	
	public String getCont() {
		return cont;
	}
	public void setCont(String cont) {
		this.cont = cont;
	}
	
}

msginfo类

package com.hibernate.model;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToOne;


public class MsgInfo { //VO DTO Value Object username p1 p2 UserInfo->User->DB
	private int id;
	private String cont;
	private String topicName;
	private String categoryName;
	public MsgInfo(int id, String cont, String topicName, String categoryName) {
		super();
		this.id = id;
		this.cont = cont;
		this.topicName = topicName;
		this.categoryName = categoryName;
	}
	public String getTopicName() {
		return topicName;
	}
	public void setTopicName(String topicName) {
		this.topicName = topicName;
	}
	public String getCategoryName() {
		return categoryName;
	}
	public void setCategoryName(String categoryName) {
		this.categoryName = categoryName;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	
	public String getCont() {
		return cont;
	}
	public void setCont(String cont) {
		this.cont = cont;
	}
	
}

QBCTESt

public void testQBC() {
			Session session = sf.openSession();
			session.beginTransaction();
			//criterion 标准/准则/约束
			Criteria c = session.createCriteria(Topic.class) //from Topic
						 
						 .add(Restrictions.gt("id", 2)) //greater than = id > 2
						 .add(Restrictions.lt("id", 8)) //little than = id < 8
						 .add(Restrictions.like("title", "t_"))
						 .createCriteria("category")
						 .add(Restrictions.between("id", 3, 5)) //category.id >= 3 and category.id <=5
						 ;
			//DetachedCriterea
			for(Object o : c.list()) {
				Topic t = (Topic)o;
				System.out.println(t.getId() + "-" + t.getTitle());
			}
			session.getTransaction().commit();
			session.close();
			
		}

QBETest

		public void testQBE() {
			Session session = sf.openSession();
			session.beginTransaction();
			Topic tExample = new Topic();
			tExample.setTitle("T_");
			
			Example e = Example.create(tExample)
						.ignoreCase().enableLike();
			Criteria c = session.createCriteria(Topic.class)
						 .add(Restrictions.gt("id", 2))
						 .add(Restrictions.lt("id", 8))
						 .add(e)
						 ;
						 
			
			for(Object o : c.list()) {
				Topic t = (Topic)o;
				System.out.println(t.getId() + "-" + t.getTitle());
			}
			session.getTransaction().commit();
			session.close();
			
		}