Hibernate中使用HQL语句删除数据

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在Hibernate 3中，增加了HQL删除语句，格式如下：

Delete FROM 表名 Where 列名=?

实例：

hibernate.cfg.xml:Hibernate环境配置文件

Xml代码



<?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="connection.username">system</property>

<property name="connection.url">

jdbc:oracle:thin:@localhost:1521:MGC

</property>

<property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>

<property name="myeclipse.connection.profile">oracle</property>

<property name="connection.password">admin</property>

<property name="connection.driver_class">

oracle.jdbc.driver.OracleDriver

</property>

<property name="show_sql">true</property>

<mapping resource="mgc/hibernate/test/Member.hbm.xml" />

</session-factory>

</hibernate-configuration>

Member.hbm.xml:数据库映射文件

Xml代码



<?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="mgc.hibernate.test.Member" table="MEMBER" schema="SYSTEM">

<id name="id" type="java.lang.Long">

<column name="ID" precision="22" scale="0" />

<generator class="assigned"></generator>

</id>

<property name="username" type="java.lang.String">

<column name="USERNAME" length="20" not-null="true" />

</property>

<property name="password" type="java.lang.String">

<column name="PASSWORD" length="20" not-null="true" />

</property>

</class>

</hibernate-mapping>

Member.java:POJO类

Java代码



package mgc.hibernate.test;

public class Member {

private long id ;

private String username ;

private String password ;

public long getId() {

return id;

}

public void setId(long id) {

this.id = id;

}

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

}

MemberOperate.java:数据库操作类

Java代码



package mgc.hibernate.test;

import java.util.Iterator;

import java.util.List;

import org.hibernate.Query;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.Transaction;

import org.hibernate.cfg.Configuration;

public class MemberOperate {

//所有的操作都是通过Session完成

private Session session = null ;

//在构造方法中实例化Session对象

public MemberOperate() {

//找到Hibernate配置

Configuration config = new Configuration().configure() ;

//从配置中取出SessionFactory

SessionFactory factroy = config.buildSessionFactory() ;

//取出一个Session

this.session = factroy.openSession() ;

}

//使用HQL语句删除数据

public void delete(int id) {

Transaction tran = this.session.beginTransaction() ;

String hql = "Delete FROM Member Where id=?" ;

Query q = this.session.createQuery(hql) ;

q.setInteger(0, id) ;

q.executeUpdate() ;

tran.commit() ;

}

}

TestDel02.java:应用程序

Java代码



package mgc.hibernate.test;

public class TestDel02 {

/**

* @param args

*/

public static void main(String[] args) {

//实例化MemberOperate对象

MemberOperate mo = new MemberOperate() ;

mo.delete(4) ;

}

}