Hibernate入门（1）-第一个Hibernate程序

Hibernate入门（1）-第一个Hibernate程序

Hibernate是最著名的ORM工具之一，本系列文章主要学习Hibernate的用法，不涉及Hibernate的原理。本文介绍第一个Hibernate例子，注意，这是一个独立的Hibernate，跟Spring和Struts没有任何关系。

目录结构

main
|--java
|----com
|------chzhao
|--------hibernatetest
|----------Dept.hbm.xml
|----------Dept.java
|----------DeptDao.java
|----------HibernateBase.java
|--resources
|----hibernate.cfg.xml
test
|----com
|------chzhao
|--------hibernatetest
|----------AppTest.java
|----------DeptDaoTest.java

maven pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion>

<groupId>com.wisdombud</groupId>
<artifactId>HibernateTest</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>HibernateTest</name>
<url>http://maven.apache.org</url>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<hibernate.version>4.2.0.Final</hibernate.version>
<hibernate.search>4.2.0.Final</hibernate.search>
<mysql-connector-java.version>5.1.29</mysql-connector-java.version>
</properties>

<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql-connector-java.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-c3p0</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-ehcache</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-search</artifactId>
<version>${hibernate.search}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>${hibernate.version}</version>
</dependency>
</dependencies>
</project>

实体类

package com.chzhao.hibernatetest;

public class Dept {
private String id;
private String DeptNo;
private String DName;

public String getId() {
return id;
}

public void setId(String id) {
this.id = id;
}

public String getDeptNo() {
return DeptNo;
}

public void setDeptNo(String deptNo) {
DeptNo = deptNo;
}

public String getDName() {
return DName;
}

public void setDName(String dName) {
DName = dName;
}
}

映射文件

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="com.chzhao.hibernatetest">
<class name="Dept" table="dept">
<id name="id" column="id" type="string"></id>
<property name="DeptNo" />
<property name="DName" />
</class>
</hibernate-mapping>

Hibernate操作基础类

package com.chzhao.hibernatetest;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public abstract class HibernateBase {
protected SessionFactory sessionFactory;// 会话工厂，用于创建会话
protected Session session;// hibernate会话
protected Transaction transaction; // hiberante事务

public HibernateBase() throws HibernateException {
this.initHibernate();
}

protected void initHibernate() throws HibernateException {
sessionFactory = new Configuration().configure().buildSessionFactory();
}

protected void beginTransaction() throws HibernateException {
session = sessionFactory.openSession();
transaction = session.beginTransaction();
}

protected void endTransaction(boolean commit) throws HibernateException {

if (commit) {
transaction.commit();
} else {
transaction.rollback();
}
session.close();
}
}

实体操作类

package com.chzhao.hibernatetest;

import java.util.Iterator;

import org.hibernate.HibernateException;
import org.hibernate.Query;

public class DeptDao extends HibernateBase {
public DeptDao() throws HibernateException {
super();
}

public void addDept(Dept Dept) throws HibernateException {
beginTransaction();
session.save(Dept);
endTransaction(true);
}

public Iterator getAllDepts() throws HibernateException {
String queryString = "select Depts from Dept as Dept";
beginTransaction();
Query query = session.createQuery(queryString);
Iterator it = query.iterate();
return it;
}

public void deleteDept(String id) throws HibernateException {
beginTransaction();
Dept Dept = (Dept) session.load(Dept.class, id);
session.delete(Dept);
endTransaction(true);
}

public Iterator getSomeDept(String name) throws HibernateException {
String queryString = "select u from Dept as u where u.name like :name";
beginTransaction();
Query query = session.createQuery(queryString);
query.setString("name", "%" + name + "%");
Iterator it = query.iterate();
return it;
}
}

hibernate配置文件

<?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">

<hibernate-configuration>
<session-factory>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="connection.url">
jdbc:mysql://localhost:3306/tz?useUnicode=true&characterEncoding=utf8
</property>
<property name="connection.username">tz</property>
<property name="connection.password">tz</property>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="show_sql">true</property>
<mapping resource="com/chzhao/hibernatetest/Dept.hbm.xml" />
</session-factory>
</hibernate-configuration>

测试类

package com.chzhao.hibernatetest;

import java.util.UUID;

import junit.framework.TestCase;

public class DeptDaoTest extends TestCase {
public void testAddDept() {
DeptDao dao = new DeptDao();
Dept dept = new Dept();
dept.setDeptNo("3");
dept.setDName("c");
dept.setId(UUID.randomUUID().toString());
dao.addDept(dept);
}
}