Hibernate个人学习笔记(2)

新增改查的操作

 

一、cfg.xml配置

<?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/test
</property>
<property name="connection.username">root</property>
<property name="connection.password">root</property>
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="myeclipse.connection.profile">
com.mysql.jdbc.Driver
</property>

<property name="hibernate.show_sql">true</property>
<property name="hibernate.format_sql">true</property>

<mapping resource="com/neusoft/Dao.hbm.xml" />
</session-factory>

</hibernate-configuration>

 

二、先实例化对象

public class User {
private int id;
private String username;
private String password;
private String nicheng;

public User() {
super();
// TODO Auto-generated constructor stub
}

public User(int id, String username, String password, String nicheng) {
super();
this.id = id;
this.username = username;
this.password = password;
this.nicheng = nicheng;
}

public int getId() {
return id;
}

public void setId(int 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;
}

public String getNicheng() {
return nicheng;
}

public void setNicheng(String nicheng) {
this.nicheng = nicheng;
}

}

三、配置实例化配置文件

<?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.neusoft.user" table="user" catalog="test">
<id name="id" type="java.lang.Integer">
<column name="id" />
<generator class="assigned"></generator>
</id>
<property name="username" type="java.lang.String">
<column name="username" length="10" />
</property>
<property name="password" type="java.lang.String">
<column name="password" length="10" />
</property>
<property name="nicheng" type="java.lang.String">
<column name="nicheng" length="20" />
</property>
</class>
</hibernate-mapping>

 

四、session 工具类

package com.neusoft.HibernateTest;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;

public class UserUtils {
//读取Hibernate.cfg.xml文件
private static SessionFactory factory;
static{
try{
//读取hibernate.cfg.xml文件
Configuration cfg = new Configuration().configure();
//建立SessionFactory
factory = cfg.buildSessionFactory();
}catch(Exception e){
e.printStackTrace();
}
}

//打开Session
public static Session getSession(){
return factory.openSession();
}

//关闭Session
public static void closeSession(Session session){
if(session != null ){
if(session.isOpen()){
session.close();
}
}
}

public static SessionFactory getSessionFactory(){
return factory;
}
}

 

五：

新增

public class Save extends TestCase{
//新增
public void test(){


Session session = null;
try {
session = UserUtils.getSession();
session.beginTransaction();
Dao dao = new Dao();
dao.setUsername("qwe");
dao.setPassword("asd");
dao.setNicheng("zxc");
session.save(dao);
session.getTransaction().commit();
} catch (Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally{
UserUtils.closeSession(session);
}
}
}

查询：

public class Load extends TestCase{
//查詢
public void test(){
Session session = null;
try {
session = UserUtils.getSession();
session.beginTransaction();
Dao dao = (Dao) session.load(Dao.class, 1);
System.out.println(dao.getUsername());
System.out.println(dao.getPassword());
System.out.println(dao.getNicheng());
session.getTransaction().commit();
} catch (Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally{
UserUtils.closeSession(session);
}
}
}

 

删除：

public class Delete extends TestCase{
//刪除
public void test(){
Session session = null;
try {
session = UserUtils.getSession();
session.beginTransaction();
Dao dao = (Dao) session.load(Dao.class, 1);
session.delete(dao);
session.getTransaction().commit();
} catch (Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally{
UserUtils.closeSession(session);
}
}
}

 

修改：

public class Undate extends TestCase {
//修改
public void test(){
Session session = null;
try {
session = UserUtils.getSession();
session.beginTransaction();
Dao dao = (Dao) session.load(Dao.class, 1);
dao.setUsername("lll");
session.update(dao);
session.getTransaction().commit();
} catch (Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally{
UserUtils.closeSession(session);
}
}
}