java hibernate 封装基类

hibernate不需要再封装

+ spring，按3层写， 已经很好用

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　　在eclipse上安装hibernate tool方法如下：
1、启动eclipse
选择help－software updates，打开available software选项卡，然后单击add sites 分别输入jboos的工具和hibernate工具在线安装地址，然后选择安装hibernate toolsjboos 和tools development release，如图示：

等待安装成功，安装过程因要下载不少jar包，视你的网络速度不同，需要的时间不同，安装完毕eclipse将提示你重新启动，重启eclipse安装完成。(注意：先安装hibernate tools成功后，再安装jboos tools development release)
2、新建一个工程myhibernate，然后然后选择file－new－hibernate configuration file(cfg.xml)，打开创建hibernate配置向导，我这里配置了一个sql server2000数据库，选中create a console configuration 复选项，以此配置文件创建hibernate控制台配置。
创建hibernate console configuration向导有main、option、classpath、mappings、common五个选项卡，如果你在工程中已经引入了jdbc驱动则，直接点击finish完成即可，以后在完成其他配置。

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　　package com.lynn.db.dao;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class BaseDao {
static Configuration conf = null;
static SessionFactory factory = null;
static Session session = null;
static{
try {
conf = new Configuration().configure();
factory = conf.buildSessionFactory();
} catch (Exception e) {
e.printStackTrace();
}
}
public static Session getSession(){
session = factory.openSession();
return session;
}
public static void closeSession(){
if(session!=null)
session.close();
}
}
下面是封装的增、删、改、查
package com.lynn.db.dao;
import java.util.List;
import org.hibernate.Criteria;
import org.hibernate.FetchMode;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.criterion.Order;
import org.hibernate.criterion.Restrictions;
import com.lynn.page.PageInfo;
public class HibernateDao {
protected Session session = null;
protected Transaction ts = null;
protected Criteria criteria;
public boolean save(Object obj){
boolean check = false;
try {
session = BaseDao.getSession();//获得连接
ts = session.beginTransaction();//创建事务
session.save(obj);//保存对象
ts.commit();//提交事务
check = true;
} catch (Exception e) {
e.printStackTrace();
ts.rollback();//出现异常则回滚事务
}
return check;
}
public boolean delete(Object obj){
boolean check = false;
try {
session = BaseDao.getSession();
ts = session.beginTransaction();
session.delete(obj);
ts.commit();
check = true;
} catch (Exception e) {
e.printStackTrace();
ts.rollback();
}
return check;
}
public boolean update(Object obj){
boolean check = false;
try {
session = BaseDao.getSession();
ts = session.beginTransaction();
session.delete(obj);
ts.commit();
check = true;
} catch (Exception e) {
e.printStackTrace();
ts.rollback();
}
return check;
}
public Criteria QueryByFetch(String...fetch){
try {
if(fetch!=null && fetch.length>0){
for (int i = 0; i < fetch.length;="" i++)="" {="" criteria="criteria.setFetchMode(fetch[i]," fetchmode.join);="" }="" }="" }="" catch="" (exception="" e)="" {="" e.printstacktrace();="" }="" return="" criteria;="" }="" public="" criteria="" querybyproperties(object...properties){="" try="" {="" if(properties!="null" &&="" properties.length="">0){
for (int i = 0; i < properties.length;="" i="i+2)" {="" criteria="criteria.add(Restrictions.like((String)properties[i]," properties[i+1]));="" }="" }="" return="" criteria;="" }="" catch="" (exception="" e)="" {="" e.printstacktrace();="" }="" return="" null;="" }="" public="" criteria="" query(class="" c){="" session="BaseDao.getSession();" criteria="session.createCriteria(c);" return="" criteria;="" }="" public="" list="" querylist(){="" try="" {="" return="" criteria.list();="" }="" catch="" (exception="" e)="" {="" e.printstacktrace();="" }="" return="" null;="" }="" public="" object="" queryunique(){="" try="" {="" return="" criteria.uniqueresult();="" }="" catch="" (exception="" e)="" {="" e.printstacktrace();="" }="" return="" null;="" }="" public="" criteria="" querybypage(pageinfo="" pageinfo){="" return="" criteria.setfirstresult((pageinfo.getpageindex()-1)*="" pageinfo.getpagesize())="" .setmaxresults(pageinfo.getpagesize());="" }="" public="" criteria="" querybyorder(order="" o){="" return="" criteria.addorder(o);="" }="">

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　　eclipse 不需要封装Hibernate,但是需要导入Hibernate包，例如：hibernate3.jar， 数据库对应的JDBC驱动（例如mysql-connector-java-5.1.5-bin.jar），slf4j-api-1.7.1.jar，slf4j-simple-1.7.1.jar，javax[1].servlet-5.1.12.jar，jta-1.1.jar，hibernate-jpa-2.0-api-1.0.1.Final.jar，javassist-3.12.0.GA.jar，antlr-2.7.6.jar，commons-collections-3.1.jar，dom4j-1.6.1.jar
，把这些jar包导入到lib下。（不知道你想问什么，希望可以帮到你）