1.主目录结构
具体实现：
Hibernate开发过程:
1. 概念：
对JDBC API进行封装，负责Java对象持久层
2. 开发步骤：
导入需要的hiberate包
新建外部jar库，统一管理jar包
1.窗口->首选项->java->构建路径->用户库->新建->添加外部jar
构建路径，添加用户库
2.属性->java构建路径->添加库->用户库->选择需要的包
设置发布项目的时间将jar文件添加在web-INF下的lib文件
3.属性->developmentAssembly->选择
.在com.cfg包下新建hiberate.cfg.xml hibernate基本配置，数据库基本信息
<?xml version="1.0"encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/HibernateConfiguration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
//数据库驱动包
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.password">123456</property>
//数据库路径
<property name="hibernate.connection.url">jdbc:mysql://127.0.0.1:3306/hiberdb?useUnicode=true&characterEncoding=UTF-8</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
//如果表不存在，可以新建表
<property name="hbm2ddl.auto">create</property>
//配置文件的在项目中路径
<mapping resource="com/cfg/tbl/Person.hbm.xml"/>
</session-factory>
</hibernate-configuration>
根据数据库的表新建pojo类
package com.model;
public classPerson {
private int id;
private String name;
private int age;
private String address;
public Person() {
super();
// TODO自动生成的构造函数存根
}
public Person(int id, String name, int age, String address) {
super();
this.id = id;
this.name = name;
this.age = age;
this.address = address;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
Pojo映射配置（在com.cfg.tbl 包下的Person.hbm.xml
<?xml version="1.0"encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/HibernateMapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
//table属性对应数据库的table表
<class name="com.model.Person" table="Person">
//id是数据库中的表的唯一标识 name是自己定义的pojo的类的属性名，//column是数据库中的属性名
<id name="id" column="ID"type="java.lang.Integer">
<generator class="increment"></generator>
</id>
<property name="name" column="NAME"type="java.lang.String"></property>
<property name="age" column="AGE"type="java.lang.Integer"></property>
<property name="address" column="ADDRESS"type="java.lang.String"></property>
</class>
</hibernate-mapping>
编写数据库帮助类（在com.db.util包下的HiberDBUtil
package com.db.util;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HiberDBUtil {
privatestatic String CONFIG_FILE_LOCATION="/com/cfg/hiberate.cfg.xml";
privatestatic Configuration config=new Configuration();
privatestatic SessionFactory sessionFac;
privatestatic ThreadLocal<Session> tdlocal=new ThreadLocal<Session>();
privatestatic String confile=CONFIG_FILE_LOCATION;
//静态数据块 加载配置文件，生成SessionFactory对象
static{
try{
//加载配置文件
config.configure(confile);
//生成SessionFactory对象
sessionFac=config.buildSessionFactory();
}catch(Exceptione){
e.printStackTrace();
}
}
privateHiberDBUtil(){
}
publicstatic SessionFactory getSessionFactory(){
returnsessionFac;
}
publicstatic Session getSession(){
Session session=tdlocal.get();
if(session==null||!session.isOpen()){
if(sessionFac==null){
reBuildSessionFactory();
}
session=(session!=null)?sessionFac.openSession():null;
tdlocal.set(session);
}
return session;
}
publicstatic void reBuildSessionFactory(){
try{
//加载配置文件
config.configure(confile);
//生成SessionFactory对象
sessionFac=config.buildSessionFactory();
}catch(Exceptione){
e.printStackTrace();
}
}
publicstatic void closeSession(){
Sessionsession=tdlocal.get();
tdlocal.set(null);
if(session!=null){
session.close();
}
}
}
编写测试类（hiberate使用事务操作数据库）
package com.Test;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import com.db.util.HiberDBUtil;
import com.model.Person;
public class Test {
publicstatic void main(String[] args) throws Exception {
SessionFactory sessionFac=HiberDBUtil.getSessionFactory();
Sessionsession=sessionFac.openSession();
//事物处理
Transactiontransa=(Transaction)session.beginTransaction();
Personp1=new Person();
p1.setId(1);
p1.setName("hzs");
p1.setAge(21);
p1.setAddress("广州");
session.save(p1);
//提交事物
transa.commit();
session.close();
}
}
//删除对象
public static void delete(int pid){
SessionFactory sessionFac=HiberDBUtil.getSessionFactory();
Sessionsession=sessionFac.openSession();
Transactiontransa=(Transaction)session.beginTransaction();
//删除对象
Pinfo pdelete=(Pinfo)session.get(Pinfo.class, pid);
session.delete(pdelete);
transa.commit();
session.close();
}
//查询数据
public static void select(){
SessionFactory sessionFac=HiberDBUtil.getSessionFactory();
Sessionsession=sessionFac.openSession();
Queryquery=session.createQuery("from Pinfo where pname like '%小%'");
List<Pinfo>list=query.list();
for(Pinfop: list){
System.out.println("姓名："+p.getPname()+"\t性别："+p.getpSex()+"\t地址："+p.getpAddress()+"\t爱好："+p.getPhob());
}
session.close();
}
//更新数据
publicstatic void update(Pinfo p){
SessionFactory sessionFac=HiberDBUtil.getSessionFactory();
Sessionsession=sessionFac.openSession();
Transactiontransa=(Transaction)session.beginTransaction();
session.update(p);
transa.commit();
session.close();
}