hibernate 之HQL查询实例

配置文件hibernate.cfg.xml：

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>

<session-factory>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="connection.url">
jdbc:mysql://localhost:3306/hubin
</property>
<property name="connection.username">root</property>
<property name="connection.password"></property>
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="myeclipse.connection.profile">mysql</property>
<property name="show_sql">true</property>
<property name="format_sql">true</property>

<mapping resource="com/hubin/entity/Users.hbm.xml" />
<mapping resource="com/hubin/entity/Userinf.hbm.xml" />
</session-factory>

</hibernate-configuration>

关系对象模型文件主表文件Users.hbm.xml：

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!--
Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
<class name="com.hubin.entity.Users" table="users" catalog="hubin">
<id name="id" type="java.lang.Long">
<column name="id" />
<generator class="increment" />
</id>
<property name="username" type="java.lang.String">
<column name="username" />
</property>
<property name="password" type="java.lang.String">
<column name="password" />
</property>
<property name="email" type="java.lang.String">
<column name="email" />
</property>
<set name="userinfs" inverse="true" cascade="delete">
<key>
<column name="userID" not-null="true" />
</key>
<one-to-many class="com.hubin.entity.Userinf" />
</set>
</class>
</hibernate-mapping>

关系对象模型副表文件Userinf.hbm.xml：

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!--
Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
<class name="com.hubin.entity.Userinf" table="userinf" catalog="hubin">
<id name="id" type="java.lang.Integer">
<column name="id" />
<generator class="increment" />
</id>
<many-to-one name="users" class="com.hubin.entity.Users" fetch="select">
<column name="userID" not-null="true" />
</many-to-one>
<property name="arm" type="java.lang.String">
<column name="arm" length="30" />
</property>
</class>
</hibernate-mapping>

Java代码：

实体类Users.java:

package com.hubin.entity;

import java.util.HashSet;
import java.util.Set;

/**
* Users entity. @author MyEclipse Persistence Tools
*/

public class Users implements java.io.Serializable {

// Fields

private Long id;
private String username;
private String password;
private String email;
private Set userinfs = new HashSet(0);

// Constructors

/** default constructor */
public Users() {
}

/** full constructor */
public Users(String username, String password, String email, Set userinfs) {
this.username = username;
this.password = password;
this.email = email;
this.userinfs = userinfs;

}

// Property accessors

public Long getId() {
return this.id;
}

public void setId(Long id) {
this.id = id;
}

public String getUsername() {
return this.username;
}

public void setUsername(String username) {
this.username = username;
}

public String getPassword() {
return this.password;
}

public void setPassword(String password) {
this.password = password;
}

public String getEmail() {
return this.email;
}

public void setEmail(String email) {
this.email = email;
}

public Set getUserinfs() {
return this.userinfs;
}

public void setUserinfs(Set userinfs) {
this.userinfs = userinfs;
}

}

实体类Userinf.java:

package com.hubin.entity;

/**
* Userinf entity. @author MyEclipse Persistence Tools
*/

public class Userinf implements java.io.Serializable {

// Fields

private Integer id;
private Users users;
private String arm;

// Constructors

/** default constructor */
public Userinf() {
}

/** minimal constructor */
public Userinf(Users users) {
this.users = users;
}

/** full constructor */
public Userinf(Users users, String arm) {
this.users = users;
this.arm = arm;
}

// Property accessors

public Integer getId() {
return this.id;
}

public void setId(Integer id) {
this.id = id;
}

public Users getUsers() {
return this.users;
}

public void setUsers(Users users) {
this.users = users;
}

public String getArm() {
return this.arm;
}

public void setArm(String arm) {
this.arm = arm;
}

}

dao层代码：

import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import org.hibernate.Session;

import com.hubin.entity.Userinf;
import com.hubin.entity.Users;
import com.hubin.sessionfactory.HibernateSessionFactory;

public class UsersDao {

/**
* 获取用户信息表所有数据
*
*/
public static void getUserInfo(){
Session session=HibernateSessionFactory.getSession();
session.beginTransaction();
List<Userinf> list=session.createQuery("from Userinf").list();
System.out.println("集合的数目"+list.size());
for(Userinf uf:list){
System.out.println(uf.getUsers().getUsername()+" "+uf.getArm());
}

session.getTransaction().commit();
session.close();
}
/**
* 获取用户表所有数据信息
*/
public static void getUsers(){
Session session=HibernateSessionFactory.getSession();
session.beginTransaction();
List<Users> list=session.createQuery("from Users").list();
for(Users us:list){
System.out.println(us.getUsername());
Set<Userinf> set=us.getUserinfs();
for(Userinf uf:set){
System.out.print(uf.getUsers().getEmail()+"    ");
}
System.out.println("");
}
System.out.println("************************************************");
Iterator<Users> it=list.iterator();
while(it.hasNext()){
System.out.println(it.next().getUsername());
}

session.getTransaction().commit();
session.close();
}
/**
* 获取用户部分信息
*/
public static void getUsersUsernameAndPassword(){
Session session=HibernateSessionFactory.getSession();
session.beginTransaction();
//此时不能通过用户表对象泛型进行接收，只能通过集合对象进行接收
List list=session.createQuery("select username,password from Users").list();
for(int i=0;i<list.size();i++){
//此时取出来的是一个对象数组
Object obj[]=(Object[])list.get(i);
System.out.println(obj[0].toString()+"  "+obj[1].toString());
System.out.println("");
}
session.getTransaction().commit();
session.close();
}

public static void main(String args[]){
//调用方法
getUsersUsernameAndPassword();
}
}