Hibernate中使用HQL語句刪除資料
阿新 • • 發佈:2019-01-26
在Hibernate 3中,增加了HQL刪除語句,格式如下:
Delete FROM 表名 Where 列名=?
例項:
hibernate.cfg.xml:Hibernate環境配置檔案
- <?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:資料庫對映檔案
Xml程式碼- <?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類
Java程式碼- 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:資料庫操作類
Java程式碼- 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 {
- //所有的操作都是通過Session完成
- private Session session = null ;
- //在構造方法中例項化Session物件
- public MemberOperate() {
- //找到Hibernate配置
- Configuration config = new Configuration().configure() ;
- //從配置中取出SessionFactory
- SessionFactory factroy = config.buildSessionFactory() ;
- //取出一個Session
- this.session = factroy.openSession() ;
- }
- //使用HQL語句刪除資料
- 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:應用程式
Java程式碼- package mgc.hibernate.test;
- public class TestDel02 {
- /**
- * @param args
- */
- public static void main(String[] args) {
- //例項化MemberOperate物件
- MemberOperate mo = new MemberOperate() ;
- mo.delete(4) ;
- }
- }