hibernate QBC 例子

hibernate QBC 例子

package com.bjsxt.hibernate;


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;
}
}

package com.bjsxt.hibernate;


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")
}
)
/*
@NamedNativeQueries(
{
@NamedNativeQuery(name="topic.select2_5Topic", query="select * from topic limit 2, 5")
}
)
*/


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;
}

}

package com.bjsxt.hibernate;


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;
}

}

package com.bjsxt.hibernate;


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




public class MsgInfo {
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;
}

}

HibernateQLTest.java

package com.bjsxt.hibernate;


import java.util.Date;


import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.annotations.FetchMode;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.criterion.Restrictions;
import org.hibernate.tool.hbm2ddl.SchemaExport;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;


public class HibernateQLTest {
private static SessionFactory sf;

@BeforeClass
public static void beforeClass() {
sf = new AnnotationConfiguration().configure().buildSessionFactory();
}
@AfterClass
public static void afterClass() {
sf.close();
}

@Test
public void testSchemaExport() {
new SchemaExport(new AnnotationConfiguration().configure()).create(false, true);
}

@Test
public void testSave() {
Session session = sf.openSession();
session.beginTransaction();

for(int i=0; i<10; i++) {
Category c = new Category();
c.setName("c" + i);
session.save(c);
}

for(int i=0; i<10; i++) {
Category c = new Category();
c.setId(1);
Topic t = new Topic();
t.setCategory(c);
t.setTitle("t" + i);
t.setCreateDate(new Date());
session.save(t);

}

for(int i=0; i<10; i++) {

Topic t = new Topic();
t.setId(1);
Msg m = new Msg();
m.setCont("m" + i);
m.setTopic(t);
session.save(m);

}




session.getTransaction().commit();
session.close();
}

//is empty and is not empty
@Test
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();

}

public static void main(String[] args) {
beforeClass();
}
}