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Java-hibernate的Hello World

2024-07-26 22:20:59   219人阅读

 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

 

Java-hibernate的Hello World


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