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@GeneratedValuepublic 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@GeneratedValuepublic 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;@ManyToOnepublic Topic getTopic() {return topic;}public void setTopic(Topic topic) {this.topic = topic;}@Id@GeneratedValuepublic 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->DBprivate 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;//DetachedCritereafor(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();}

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Hibernate QBC与QBE

创建类

QBCTESt

QBETest

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