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kela的笔�?ORM产品 ---- hibernate(5)

Kela — Thu, 08 Dec 2005 05:29:00 GMT

Hibernate Query Language�Q�HQL�Q?BR>
相对于Criteria提供的符合面向对象风格的查询��装模式。HQL提供了更加丰富灵�zȝ��Ҏ��，它在�늛�Criteria功能范围的前提下�Q�提供了更加强大的查询（在Hibernate3中增加了实体的更斎ͼ�删除�Q�能力。更多的HQL使用�Ҏ��请参考Hibernate开发手册和其它�|�络资源。HQL为官�Ҏ��荐查询模式�?BR>�C�Z��Q�StudentCriteriaQuery.java一个基于HQL的查询，更新�Q�删除�?BR>/**
* StudentHQL.java
* Hibernate Query Language(HQL)
*/
package com.kela.hb.model;

import java.util.Iterator;
import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

import com.kela.hb.pojo.KelaStudent;
import com.kela.hb.util.HibernateUtil;

/**
* @author kangfeng(kela.kf@gmail.com)
*
*/
public class StudentHQL {

/*
   * 实体查询(查询数据库表中所有的�U�录)
   */
public void exampleSelect_1(){
    Session session;
    Query query;

    String hql;
    try {
       session = HibernateUtil.currentSession();

       //查询�W�合相应�~�号和年龄大�?5的学生纪�?BR>      hql = " from com.kela.hb.pojo.KelaStudent as kelaStudent " +
                " where kelaStudent.stuID = '402880fc07dfe16f0107dfe173640001' " +
                " or kelaStudent.stuAge > 25";
      query = session.createQuery(hql);
      List list = query.list();
      Iterator it = list.iterator();
     while(it.hasNext()) {
         KelaStudent kelaStudent = (KelaStudent)it.next();
         System.out.print("    姓名:" + kelaStudent.getStuName());
         System.out.print("    性别:" + kelaStudent.getStuSex());
        System.out.print("    �q�龄:" + kelaStudent.getStuAge());
         System.out.print("    地址:" + kelaStudent.getStuAddress());
         System.out.println();
      }
    } catch(HibernateException he) {
       System.out.println("[提示]: 查询数据发生错误," + he.getMessage());
    } finally {
       HibernateUtil.closeSession();
    }
}

/*
* 属性查�?查询数据库表中需要的若干个字�D?
* �q�回�c�d��为数�l�方�?BR> */
public void exampleSelect_2(){
   Session session;
   Query query;

   String hql;
   try {
      session = HibernateUtil.currentSession();

     //查询KELA_STUDENT中字�D��ؓStuName�Q�StuAge�Q�StuAddress的所有纪�?BR>      //同样也可以加一些条�?BR>     hql = " select kelaStudent.stuName, kelaStudent.stuAge, kelaStudent.stuAddress " +
               " from com.kela.hb.pojo.KelaStudent as kelaStudent ";
      query = session.createQuery(hql);
      List list = query.list();
      Iterator it = list.iterator();
      while(it.hasNext()) {
         Object[] rs = (Object[])it.next();
         System.out.print("    姓名:" + rs[0]);
         System.out.print("    �q�龄:" + rs[1]);
         System.out.print("    地址:" + rs[2]);
        System.out.println();
      }
    } catch(HibernateException he) {
       System.out.println("[提示]: 查询数据发生错误," + he.getMessage());
    } finally {
       HibernateUtil.closeSession();
    }
}

/*
* 参数�l�定(使用��序占位�W?? ),相当于我们经�怋�用的�Q?BR>  * select * from KELA_STUDENT where KelaID = ?    and KelaAge > ?
*/
public void exampleSelect_3(){
    Session session;
   Query query;

    String hql;
     try {
        session = HibernateUtil.currentSession();

        //查询�W�合相应�~�号和年龄大�?0的学生纪�?BR>       hql = " from KelaStudent as kelaStudent " +
                " where kelaStudent.stuID = ? or kelaStudent.stuAge >= ?";
       query = session.createQuery(hql);
       //注意了是�?开始的
       query.setString(0, "402880fc07dfe16f0107dfe173640001");
      query.setInteger(1, 20);
       List list = query.list();
       Iterator it = list.iterator();
      while(it.hasNext()) {
          KelaStudent kelaStudent = (KelaStudent)it.next();
          System.out.print("    姓名:" + kelaStudent.getStuName());
          System.out.print("    性别:" + kelaStudent.getStuSex());
           System.out.print("    �q�龄:" + kelaStudent.getStuAge());
           System.out.print("    地址:" + kelaStudent.getStuAddress());
           System.out.println();
       }
    } catch(HibernateException he) {
       System.out.println("[提示]: 查询数据发生错误," + he.getMessage());
    } finally {
       HibernateUtil.closeSession();
    }
  }

/*
   * 参数�l�定(使用引用占位�W?: ),相当于我们经�怋�用的�Q?BR>   * select * from KELA_STUDENT where KelaID = ? and KelaAge > ?
   */
   public void exampleSelect_4(){
     Session session;
     Query query;

     String hql;
     try {
       session = HibernateUtil.currentSession();

         //查询�W�合相应�~�号的学生纪�?BR>         hql = " from KelaStudent as kelaStudent " +
                  " where kelaStudent.stuID = :stuID ";
         query = session.createQuery(hql);
         //stuID 对应 :stuID
         query.setParameter("stuID", "402880fc07dfe16f0107dfe173640001");
         List list = query.list();
         Iterator it = list.iterator();
         while(it.hasNext()) {
             KelaStudent kelaStudent = (KelaStudent)it.next();
             System.out.print("    姓名:" + kelaStudent.getStuName());
             System.out.print("    性别:" + kelaStudent.getStuSex());
            System.out.print("    �q�龄:" + kelaStudent.getStuAge());
             System.out.print("    地址:" + kelaStudent.getStuAddress());
             System.out.println();
       }
     } catch(HibernateException he) {
         System.out.println("[提示]: 查询数据发生错误," + he.getMessage());
      } finally {
        HibernateUtil.closeSession();
      }
   }

/*
    * 利用HQL的更�?BR>    */
   public void exampleUpdate() {
     Session session;
     Transaction tran;
     Query query;

     String hql;
     try {

       session = HibernateUtil.currentSession();
        tran = session.beginTransaction();

         hql = " update KelaStudent " +
                  " set stuAge = 30 " +
                  " where stuID = '402880fc07dfe16f0107dfe173640001' ";
         query = session.createQuery(hql);
         System.out.println("更新的纪录条数是:" + query.executeUpdate());
         tran.commit();
     } catch (HibernateException he) {
         System.out.println("[提示]: 更新数据发生错误," + he.getMessage());
     } finally {
          HibernateUtil.closeSession();
      }
   }

/*
   * 利用HQL的删�?BR>   */
  public void exampleDelete() {
   Session session;
    Transaction tran;
    Query query;

   String hql;
    try {
        session = HibernateUtil.currentSession();
        tran = session.beginTransaction();

       hql = "delete KelaStudent where stuID = '402880fc080437200108043725760001'";

       query = session.createQuery(hql);
      System.out.println("删除�U�录的条数是�Q? + query.executeUpdate());
        tran.commit();
     } catch(HibernateException he) {
        System.out.println("[提示]: 删除数据发生错误," + he.getMessage());
     } finally {
         HibernateUtil.closeSession();
     }
}
public static void main(String[] args) {

      StudentHQL studentHQL = new StudentHQL();
       studentHQL.exampleSelect_1();
}

}

Kela 2005-12-08 13:29 发表评论

kela的笔�?ORM产品 ---- hibernate(4)

Kela — Tue, 06 Dec 2005 05:31:00 GMT

使用Criteria Query �q�行数据查询

Criteria Query 是一�U�通过对象化的查询�Q��ƈ��数据查询条件封装�ؓ一个对象�?BR>��单来看，可以看作是传�l�SQL的对象化表示�Q�如�Q?BR> criteria = session.createCriteria(KelaStudent.class);
criteria.add(Expression.eq("stuName", "邓立�?));
�q�相当于SQL�?" select * from KELA_STUDENT where StuName = '邓立�? "

�q�种方式的特�Ҏ��比�h�W�合Java�E�序员的�~�码习惯�Q�非常的�Ҏ��上手�?/P>

更多的��用方法和参数,参考Hibernate文档和深入浅出Hibernate�{�资料�?/P>

�C�Z��一�Q�StudentCriteriaQuery.java 一个基�?Criteria Query 的查�?BR>
/**
* StudentCriteriaQueryl.java
*
* ��Z�� Criteria Query 的对象化查询
*/
package com.kela.hb.model;

import java.util.Iterator;
import java.util.List;

import org.hibernate.Criteria;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.criterion.Example;
import org.hibernate.criterion.Expression;

import com.kela.hb.pojo.KelaStudent;
import com.kela.hb.util.HibernateUtil;

/**
* @author kangfeng(kela.kf@gmail.com)
*
*/
public class StudentCriteriaQuery {

  /*
* 带有表达式的 Criteria 查询
   */
public void exampleSelect_1() {
      Session session;
      Criteria criteria;
      try {
         session = HibernateUtil.currentSession();
         criteria = session.createCriteria(KelaStudent.class);

          //关于Expression提供的对应查询限定机�? 可在Hibernate的文��中获得详细资料
          //如果没有一下的查询条�g则查询所有的数据�?KELA_STUDENT 的纪�?BR>
          //查询数据库表 KELA_STUDENT 中　StuName = '邓立�?的纪�?
          //查询条�g中的stuName对应com.kela.hb.pojo.KelaStudent的属性stuName
          //criteria.add(Expression.eq("stuName", "邓立�?));

          //查询�q�龄大于25岁的学生�U�录
          criteria.add(Expression.gt("stuAge", new Integer(25)));

           //如果同时出现几个限定条�g,�?StuName = '邓立�?; stuAge > 25 则取交集

           KelaStudent kelaStudent = new KelaStudent();

           List list = criteria.list();
           Iterator it = list.iterator();
           while(it.hasNext()) {
                kelaStudent = (KelaStudent)it.next();
                System.out.print(" �~�号:" + kelaStudent.getStuID());
                System.out.print(" 名称:" + kelaStudent.getStuName());
                System.out.print(" 性别:" + kelaStudent.getStuSex());
                System.out.print(" �q�龄:" + kelaStudent.getStuAge());
                System.out.print(" 地址:" + kelaStudent.getStuAddress());
                System.out.println();
           }
       } catch (HibernateException e) {
            System.out.println("[提示]: 查询没有成功," + e.getMessage());
       } finally {
           HibernateUtil.closeSession();
     }
}

/*
   * �C�Z��查询,�Ҏ��已有的对象，查询属性与之相�W�的其它对象
   */
public List exampleSelect_2(KelaStudent kelaStudent) {
      Session session;
      Criteria criteria;
      try {
          session = HibernateUtil.currentSession();
          criteria = session.createCriteria(KelaStudent.class);
          criteria.add(Example.create(kelaStudent));
          return criteria.list();
      } catch (HibernateException he) {
         System.out.println("[提示]: 查询发生错误," + he.getMessage());
         return null;
      } finally {
         HibernateUtil.closeSession();
     }
}

/*
   * 调用�C�Z��查询�Q��ƈ打印�l�果
   * �q�种查询�q�不常用�Q�但是在�l�合查询中非常的有用途�?BR>   * 比如要查询的条�g有多个，但不能确定的时候，可以按照下面的例子��用，直接讑֮�查询的条�Ӟ��
   * �?nbsp;后将对象传入卛_��查询�?BR>   */
   public void exampleSelect_3() {
      KelaStudent kelaStudent = new KelaStudent();
      //在这里可以设�|�多个条�Ӟ��如年龄，地址�{?BR>     kelaStudent.setStuName("邓立�?);

    List list = exampleSelect_2(kelaStudent);
     Iterator it = list.iterator();
     while(it.hasNext()) {
        kelaStudent = (KelaStudent)it.next();
         System.out.print(" �~�号:" + kelaStudent.getStuID());
         System.out.print(" 名称:" + kelaStudent.getStuName());
         System.out.print(" 性别:" + kelaStudent.getStuSex());
         System.out.print(" �q�龄:" + kelaStudent.getStuAge());
         System.out.print(" 地址:" + kelaStudent.getStuAddress());
         System.out.println();
     }

   }

   public static void main(String[] args) {
          StudentCriteriaQuery scq = new StudentCriteriaQuery();

          //查询�q�龄大于25的学生纪�?BR>          scq.exampleSelect_1();

          //按照�l�定的条件进行查询，�q�里�?name = '邓立�?
         //scq.exampleSelect_3();
   }

}

Kela 2005-12-06 13:31 发表评论

kela的笔�?ORM产品 ---- hibernate(3)

Kela — Tue, 22 Nov 2005 05:02:00 GMT

一个Hibernate版本的“Hello World�?BR>
1. 搭徏环境
     建立��目�Q?/STRONG>名称为HibernateProject�Q�如下图�Q?BR>
      下蝲Hibernate发行包：
       �q�里使用 Hibernate3.X �Q�因�?Hibernate �?.X 上性能有了更大的提升。（也可以采�?2. X的版本，3.X �?2.X 之间的差异不多，�q�里的“不多”是从��用者的角度来看�Q�在需要注意的地方�Q�会注明�Q�另�?3.X �?2.X 差异表一张）
      下蝲地址�Q?A >http://www.hibernate.org �?http://www.redsaga.com 的努力之下，Hibernate 的官方发行包中（ doc\reference 下）�Q�始�l�有高质量的中文官方文��Q�非常的感谢他们�?BR>      在ClassPath 中设�|�系�l�开发需要的�c�d��Q?BR>      在项目的lib目录下添加以下类�? .jar) 文�g�Q��ƈ且将�q�些 .jar 指定在系�l?nbsp;ClassPath 中。（��M��Q�无论在哪种环境中都必须保证�pȝ��能找到我们设�|�的 .jar �?BR>        a.数据库驱动程�?BR>           数据库��?MS SQL SERVER �Q�以下是MS �?JDBC 驱动。（ MS �?JDBC 驱动不是 Hibernate 官方的推荐驱动，在实际的��目中，朋友们可以根�?Hibernate  开发文��中的配�|�说明进行取舍）
           msbase.jar, mssqlserver.jar, msutil.jar
        b.Hibernate 3.X 的类�?BR>           ��发行包下的 hibernate3.jar 文�g复制�?��目�Q�HibernateProject�Q�的 lib 目录下�?BR>        c.Hibernate需要的�W�三方类�?BR>           ��发行包�?lib 目录下的 .jar 文�g复制到项目（HibernateProject�Q�的 lib 目录下�?BR>           需要注意的是，我们�q�里��全部的 .jar 攑֜�了lib中，在实际的开发中可以�Ҏ��文��配置的说明，�q�行选择�?BR>
2. 建立数据�?BR>    数据库名�U�ͼ�hbdb
create database hbdb;
   数据表名�U�ͼ�KELA_STUDENT
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[KELA_STUDENT]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[KELA_STUDENT]
GO

CREATE TABLE [dbo].[KELA_STUDENT] (
[StuID] [varchar] (32) COLLATE Chinese_PRC_CI_AS NOT NULL ,        -- PK
[StuName] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,            --学生姓名
[StuSex] [char] (1) COLLATE Chinese_PRC_CI_AS NULL ,                      --学生性别
[StuAge] [smallint] NULL ,                                                                             --学生�q�龄
[StuAddress] [varchar] (255) COLLATE Chinese_PRC_CI_AS NULL         --学生地址
) ON [PRIMARY]
GO

3. ��?发行包下 ehcache.xml 文�g复制�?src �?nbsp;
    在Hibernate3�? 如果没有�q�个文�g会出�?BR>        WARN Configurator:126 - No configuration found. Configuring ehcache from ehcache-failsafe.xml found in
         the classpath: jar:file:/D:/J2eeProject/HibernateProject/lib/ehcache-1.1.jar!/ehcache-failsafe.xml
        的错误�?BR>    该文件�ؓ Hibernate 的本�w�的 Cache 配置�?BR>4. Hibernate 配置
    Hibernate 配置文�g主要用于配置数据库连接和Hibernate�q�行时所需要的各种属性（如，�q�接池，SQL方言�Q�是否现实SQL日志�{�）�?BR>    Hibernate 同时支持 xml 格式的配�|�文件各传统�?properties 文�g配置形式�Q�这里采�?xml �?BR>    配置文�g名默认�ؓ hibernate.cfg.xml�Q�或 hibernage.properties�Q�，Hibernate在初始化期间自动�?classPath中寻找这个文�Ӟ��q�读取其中的配置信息�Q��ƈ加蝲�?BR>    以下�?hibernate.cfg.xml 文�g�Q�在��目 HibernateProject 的src 下放以下内容�Q�：

        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "




   true




   org.hibernate.dialect.SQLServerDialect




   sa




   123456




   com.microsoft.jdbc.sqlserver.SQLServerDriver




   jdbc:microsoft:sqlserver://127.0.0.1:1433;DatabaseName=hbdb




  org.hibernate.connection.C3P0ConnectionProvider
  2
  2
  50000
  100
  3000
  2
  false





5. 日志配置
在Hibernate发行包的etc目录下找�?log4j.properties �C�Z��配置文�g�Q�可以修改其中的日志�U�别�Q�也可直接��用�?BR>在src下，攄�� log4j.properties 文�g�Q�内容如下：
# log4j #
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

log4j.rootLogger=warn, stdout

#讄��昄�� error以上�U�别log
log4j.logger.org.hibernate=error

6. 构徏 POJO �c�d��Hibernate映射( .hbm.xml)文�g
        说明�Q�根据数据库定义导出表结构，�q�自动生成对应的映射文�g和POJO java代码�Q�是实际开发当中最常用的方式，也是专家所推荐的。可以��?MiddleGen -- Hibernate�Q�Hibernate -- Extensions �{�的工具�Q�这些工��L��使用非常的方便，只修修改相应�?ant 构徏文�g卛_��Q�在�|�络上可以很�Ҏ��的找到这些工��L��使用�Ҏ��?BR>        �q�里采用手工�~�写 POJO 和映��文件的�Ҏ��Q�是��Z��开发者更好理�?Hibernate �q�作机制而考虑。付出手工编写会产生疏漏和错误的代�h�Q�我觉得在学习阶�D�|��值得的�?BR>      以下是这两个文�g�Q�他们的位置都在   com.kela.hb.pojo 下面�?BR>POJO�c�：com.kela.hb.pojo.KelaStudent
/**
* KelaStudent.java
*/
package com.kela.hb.pojo;

import java.io.Serializable;

public class KelaStudent implements Serializable {

private static final long serialVersionUID = 8365163573354176897L;

String stuID;
String stuName;
String stuSex;
Integer stuAge;
String stuAddress;

public KelaStudent() {

}

public String getStuAddress() {
  return stuAddress;
}

public void setStuAddress(String stuAddress) {
  this.stuAddress = stuAddress;
}

public Integer getStuAge() {
  return stuAge;
}

public void setStuAge(Integer stuAge) {
  this.stuAge = stuAge;
}

public String getStuID() {
  return stuID;
}

public void setStuID(String stuID) {
  this.stuID = stuID;
}

public String getStuName() {
  return stuName;
}

public void setStuName(String stuName) {
  this.stuName = stuName;
}

public String getStuSex() {
  return stuSex;
}

public void setStuSex(String stuSex) {
  this.stuSex = stuSex;
}
}

映射文�g�Q�KelaStudent.hbm.xml

    PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "