标签：style blog http color io os 使用 ar java
hibernate 是对jdbc进行轻量级封装的 orm 框架，充当项目的持久层.
要使用 hibernate首先就需要继续配置，
引包：下载hibernate然后加入jar包
同时引入mysql的jar包
<1> 首先，手动去创建一张测试用的表，这里数据库选择mysql
CREATE TABLE `employee` ( `id` int(10) NOT NULL auto_increment, `name` varchar(20) NOT NULL, `email` varchar(20) NOT NULL, `hiredate` date NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=12 DEFAULT CHARSET=latin1;
然后去手动录入数据
<2>创建我们的domain对象
建一个包，名为com.sun.domain，在包下建立一个java文件名为：Employee.java
这里面装的都是表里面的所有的字段
package com.sun.domain;
public class Employee {
private static final long serialVersionUID = 1L;
private Integer id;
private String name;
private String email;
private java.util.Date hiredate;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public java.util.Date getHiredate() {
return hiredate;
}
public void setHiredate(java.util.Date hiredate) {
this.hiredate = hiredate;
}
}
<3>在com.sun.domain下创建对象和表的映射关系Employee.hbm.xml
<property></property> 标签下name是domain对象的属性名，<column/>是和该对像属性名相对应的表的字段名
<?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 package="com.sun.domain"> <class name="Employee" table="employee" > <id name="id" type="java.lang.Integer"> <generator class="increment"></generator> </id> <property name="name" type="java.lang.String"> <column name="name" not-null="true"/> </property> <property name="email" type="java.lang.String"> <column name="email" not-null="true"/> </property> <property name="hiredate" type="java.util.Date"> <column name="hiredate" not-null="true"/> </property> </class> </hibernate-mapping>
<4>手动配置我们的hibernate.cfg.xml文件，该文件用于配置 连接的数据库的类型，driver, 对象关系映射文件
<?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>
<!--数据库的连接--> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql://127.0.0.1:3306/test</property>
<!--数据库的用户名和密码-->
<property name="connection.username">root</property>
<property name="connection.password">123456</property>
<property name="show_sql">true</property> <property name="dialect">org.hibernate.dialect.MySQLInnoDBDialect</property> <mapping resource="com/sun/domain/Employee.hbm.xml"/> </session-factory> </hibernate-configuration>
<5>写一个手动测试文件，因为hibernate是一个数据库持久层框架，所以，不至于web能用，se也能有使用，这里就用se进行测试
创建一个包com.sun.seriver，在下面创建一个文件Student.java
package com.sun.seriver;
import java.util.Date;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import com.sun.domain.Employee;
public class Student {
public static void main(String[] args) {
// TODO Auto-generated method stub
Student.delEmpoyee(); //删除
// Student.upEmpoyee();//更新
// Student.selectEmpoyee();//查询
// Student.addEmpoyee();//添加
}
private static void delEmpoyee() {
Configuration cfg=new Configuration();
SessionFactory sf = cfg.configure("hibernate.cfg.xml").buildSessionFactory();
Session session = sf.openSession();
Transaction ts=session.beginTransaction();
Employee emp=(Employee) session.load(Employee.class, 2);
session.delete(emp);
ts.commit();
}
private static void upEmpoyee() {
Configuration cfg=new Configuration();
SessionFactory sf = cfg.configure("hibernate.cfg.xml").buildSessionFactory();
Session session = sf.openSession();
Transaction ts= session.beginTransaction();
Employee emp=(Employee)session.load(Employee.class, 1);
emp.setName("usagi");
ts.commit();
}
//SQL SELECT
private static void selectEmpoyee() {
Configuration cfg=new Configuration();
SessionFactory sf = cfg.configure("hibernate.cfg.xml").buildSessionFactory();
Session session = sf.openSession();
Employee emp=(Employee) session.load(Employee.class, 2);
System.out.println(emp.getId()+" "+emp.getName()+" "+emp.getEmail());
session.close();
}
//INSERT SELECT
private static void addEmpoyee() {
Employee s = new Employee();
s.setName("sunzhiyan");
s.setEmail("999@qq.com");
s.setHiredate(new Date());
System.out.println("test is ok");
Configuration cfg=new Configuration();
SessionFactory sf = cfg.configure("hibernate.cfg.xml").buildSessionFactory();
Session session = sf.openSession();
session.beginTransaction();
session.save(s);
session.getTransaction().commit();
session.close();
sf.close();
}
}
这样，基本的hibernate的基本配置和测试就完成了
标签：style blog http color io os 使用 ar java
原文地址：http://www.cnblogs.com/sunxun/p/4022055.html
