1.创建项目,项目名称hibernatedemo8,目录结构如图所示

2.在项目中创建lib目录存储jar文件,目录结构如图所示

3.在src目录中创建实体Bean Forum,包名(com.mycompany.demo.bean),如图所示

4.实体Bean Forum的内容如下

package com.mycompany.demo.bean;public class Forum {private int fid;private String name;public Forum() {super();}public Forum(String name) {super();this.name = name;}public int getFid() {return fid;}public void setFid(int fid) {this.fid = fid;}public String getName() {return name;}public void setName(String name) {this.name = name;}@Overridepublic int hashCode() {final int prime = 31;int result = 1;result = prime * result + fid;result = prime * result + ((name == null) ? 0 : name.hashCode());return result;}@Overridepublic boolean equals(Object obj) {if (this == obj)return true;if (obj == null)return false;if (getClass() != obj.getClass())return false;Forum other = (Forum) obj;if (fid != other.fid)return false;if (name == null) {if (other.name != null)return false;} else if (!name.equals(other.name))return false;return true;}
}

5.在src目录中创建实体Bean Forum的映射文件Forum.hbm.xml,包名(com.mycompany.demo.bean),如图所示

6.映射文件Forum.hbm.xml的内容如下

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN""http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> <!--package:指定<class/>所在的包 -->
<hibernate-mapping package="com.mycompany.demo.bean"><!--name:类名table:表名 catalog:数据库名称,默认为hibernate.cfg.xml中配置的数据库名称--><class name="Forum" table="hnsq_forum" catalog="b_shequ_two"><meta attribute="class-description">This class contains the forum detail. </meta><!--name:属性名colum:列名 --><id name="fid" type="int" column="fid"><!--increment:hibernate维护主键值identity:数据库自增长sequence:序列native:根据不同的数据库选择生成策略uuid:通过UUID算法生成,实际使用较多assigned:手工设置--><generator class="native"/></id><!--length:字节长度type:字段类型,支持java和hibernate类型not-null:非空约束unique:唯一性约束--><property name="name" column="name" type="string" length="50" not-null="true" unique="false"/></class>
</hibernate-mapping>

7.在src目录中创建工具类 HbnUtil,包名(com.mycompany.demo.util),如图所示

8.工具类 HbnUtil的内容如下

package com.mycompany.demo.util;import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;public class HbnUtil {private static SessionFactory sessionFactory;public static Session getSession(){if(sessionFactory == null || sessionFactory.isClosed()){sessionFactory = new Configuration().configure().buildSessionFactory();}return sessionFactory.getCurrentSession();}
}

9.在src目录中创建Hibernate的配置文件hibernate.cfg.xml,如图所示

10.Hibernate的配置文件hibernate.cfg.xml的内容如下

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration SYSTEM
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"><hibernate-configuration><session-factory><!-- 方言,可以从Hibernate核心jar(hibernate-core-x.x.x.Finall.jar)文件中的or.hibernate.dialect包中找到相应的类,类的全名就是 --><property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property><!-- 驱动 --><property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property><!-- 数据库连接地址 --><property name="hibernate.connection.url">jdbc:mysql://localhost:3306/b_shequ_two</property><!-- 用户名 --><property name="hibernate.connection.username">root</property><!-- 密码 --><property name="hibernate.connection.password"></property><!--create:每次都新创建,如果存在就删除create-drop:创建新表,sessionFactory关闭,表会删除update :表字段增加,会同步,字段减少不同步,数据改变会同步修改--><property name="hibernate.hbm2ddl.auto">update</property><!-- 输出sql --><property name="hibernate.show_sql">true</property><!-- 格式化sql --><property name="hibernate.format_sql">true</property><!-- 事务环境一个线程对一个事务thread:本地事务环境jta:分布式事务环境SpringSessionContext:用于ssh整合--><property name="hibernate.current_session_context_class">thread</property>   <!-- 使用c3p0数据源 --><property name="hibernate.connection.provider_class">org.hibernate.c3p0.internal.C3P0ConnectionProvider</property> <!-- List of XML mapping files --><mapping resource="com/mycompany/demo/bean/Forum.hbm.xml"/>
</session-factory>
</hibernate-configuration>

11.在项目中创建test目录存储测试文件,文件名称ManageForum,包名(com.mycompany.demo.bean),目录结构如图所示

12.ManageForum测试类的内容如下

package com.mycompany.demo.bean;import java.math.BigInteger;
import java.util.List;import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.SQLQuery;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.criterion.Order;
import org.hibernate.criterion.Projections;
import org.hibernate.criterion.Restrictions;
import org.junit.Before;
import org.junit.Test;import com.mycompany.demo.util.HbnUtil;public class ManageForum {private Session session;@Beforepublic void init(){session = HbnUtil.getSession();}/** 唯一性查询-SQL*/@Testpublic void testUniqueSQL(){try {session.beginTransaction();String sql = "SELECT * FROM hnsq_forum WHERE fid = ?";Forum forum = (Forum) session.createSQLQuery(sql).addEntity(Forum.class).setInteger(0, 54).uniqueResult();System.out.println(forum.getName());session.getTransaction().commit();} catch (Exception e) {session.getTransaction().rollback();e.printStackTrace();}}/** 唯一性查询-HQL*/@Testpublic void testUniqueHQL(){try {session.beginTransaction();String sql = "FROM Forum WHERE fid = ?";Forum forum = (Forum) session.createQuery(sql).setInteger(0, 54).uniqueResult();System.out.println(forum.getName());session.getTransaction().commit();} catch (Exception e) {session.getTransaction().rollback();e.printStackTrace();}}/** 唯一性查询-QBC*/@Testpublic void testUniqueQBC(){try {session.beginTransaction();Forum forum = (Forum) session.createCriteria(Forum.class).add(Restrictions.eq("fid", 54)).uniqueResult();System.out.println(forum.getName());session.getTransaction().commit();} catch (Exception e) {session.getTransaction().rollback();e.printStackTrace();}}/** 聚合函数查询-SQL*/@Testpublic void testCountSQL(){try {session.beginTransaction();String sql = "SELECT COUNT(*) FROM hnsq_forum";BigInteger total = (BigInteger) session.createSQLQuery(sql).uniqueResult();System.out.println(total);session.getTransaction().commit();} catch (Exception e) {session.getTransaction().rollback();e.printStackTrace();}}/** 聚合函数查询-HQL*/@Testpublic void testCountHQL(){try {session.beginTransaction();String sql = "SELECT COUNT(*) FROM Forum";Long total = (Long) session.createQuery(sql).uniqueResult();System.out.println(total);session.getTransaction().commit();} catch (Exception e) {session.getTransaction().rollback();e.printStackTrace();}}/** 聚合函数查询-QBC*/@Testpublic void testCountQBC(){try {session.beginTransaction();String sql = "SELECT COUNT(*) FROM Forum";Long total = (Long) session.createCriteria(Forum.class).setProjection(Projections.count("fid")).uniqueResult();System.out.println(total);session.getTransaction().commit();} catch (Exception e) {session.getTransaction().rollback();e.printStackTrace();}}
}

本文转自 素颜猪 51CTO博客，原文链接:http://blog.51cto.com/suyanzhu/1911392