hibernate helloword
1.首先下载hibernate 对应的jar 包
antlr-2.7.6.jar commons-collections-3.1.jar dom4j-1.6.1.jar hibernate3.jar javassist-3.9.0.GA.jar jta-1.1.jar log4j-1.2.15.jar mysql-connector-java-5.1.9.jar
slf4j-api-1.5.8.jar slf4j-log4j12-1.6.4.jar
其中mysql-connector-java-5.1.9.jar 为连接数据库驱动包
slf4j-api-1.5.8.jar slf4j-log4j12-1.6.4.jar log4j-1.2.15.jar 日志接口包与实现包
2.数据库为mysql IDE eclipse
3.新建数据库
(1)在mysql bin下 进入数据库 mysql -uroot -p ;
(2)create database hibernate;
(3)mysql> create table customers( id int primary key,name varchar(15) not null,password varchar(8) not null);
4.在src 跟目录下新建hibernate.cfg.xml 文件
文件内容如下:
<?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="connection.username">root</property>
<property name="connection.url">jdbc:mysql://127.0.0.1:3306/hibernate</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="myeclipse.connection.profile">hbmysql</property>
<property name="connection.password"></property>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<mapping resource="hbm/Customer.hbm.xml" />
</session-factory>
</hibernate-configuration>
注意：这里用的是mysql 方言。
5.新建hbm包
(1)Customer 类
package hbm;
public class Customer {
private int id;
private String name;
private String password;
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 String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Customer() {
}
}
(2)Customer.hbm.xml 对应Customer类的于数据库的配置文件
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="hbm.Customer" table="CUSTOMERS">
<id name="id" column="ID" type="int">
<generator class="increment"/>
</id>
<property name="name" column="NAME" type="string" not-null="true"/>
<property name="password" column="PASSWORD" type="string" not-null="true"/>
</class>
</hibernate-mapping>
(3)测试类Hbmain.java
package hbm;
import java.util.Iterator;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
public class Hbmain {
public static SessionFactory sessionFactory;// 数据存储源
static {
try {
Configuration config = new Configuration().configure();
sessionFactory = config.buildSessionFactory();
} catch (Exception e) {
e.printStackTrace();
}
}
/*
* 将一个customer对象存入database
*
* @Customer customer Object
*/
public void saveCustomer(Customer ct) {
Session session = sessionFactory.openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
session.save(ct);
tx.commit();
} catch (Exception e) {
tx.rollback();
e.printStackTrace();
} finally {
session.close();
}
}
/*
* 查找所有的customer object
*/
public void findAll() {
Session session = sessionFactory.openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
List customers = session.createQuery(
"from Customer as c order by c.name asc").list();
Iterator it = customers.iterator();
System.out.println("append:" + customers.size());
while (it.hasNext()) {
Customer c = (Customer) it.next();
System.out.println("ID:" + c.getId());
System.out.println("Name:" + c.getName());
System.out.println("Pass:" + c.getPassword());
}
tx.commit();
} catch (Exception e) {
tx.rollback();
} finally {
session.close();
}
}
/*
* 修改customer Name
*
* @name
*/
public void loadUpdate(int customer_id, String name) {
Session session = sessionFactory.openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
Customer c = (Customer) session.load(Customer.class, customer_id);
c.setName(name);
tx.commit();
} catch (Exception e) {
if (tx != null) {
tx.rollback();
}
e.printStackTrace();
} finally {
session.close();
}
}
/*
* 测试以上的方法 save() find() update()
*/
public void test() {
Customer ct = new Customer();
// ct.setId(5);
ct.setName("wj");
ct.setPassword("123456");
this.saveCustomer(ct);
this.findAll();
this.loadUpdate(ct.getId(), "phop");
}
public static void main(String[] args) {
Hbmain hb = new Hbmain();
hb.test();
sessionFactory.close();
}
}