怎样编写一个简单的hibernate程序

使用两种方法来实现将数据插入数据库的程序

第一种方法：传统的hibernate

首先此程序需要的jar包为：

1、数据库端的操作

创建数据库语句：

create database hibernate character set utf8;

创建表：

use hibernate;

create table student(id int primary key,name varchar(20),age int);

     

2、hibernate连接数据库的配置文件hibernate.cfg.xml，存放在src目录下。

<?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>

        <!-- Database connection settings -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>
        <property name="connection.username">root</property>
        <property name="connection.password">root</property>

        <!-- JDBC connection pool (use the built-in) -->
        <!-- <property name="connection.pool_size">1</property> -->

        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

        <!-- Enable Hibernate's automatic session context management -->
        <!-- <property name="current_session_context_class">thread</property>  -->

        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>

        <!-- Drop and re-create the database schema on startup -->
        <!-- <property name="hbm2ddl.auto">update</property>  -->

        <mapping resource="com/bjxst/hibernate/model/Student.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

3、封装数据库字段的类 Student.java 

package com.bjxst.hibernate.model;

public class Student {
private int id;
private String name;
private int age;
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;
}

}

   

4、建立Student.java封装的字段与数据库表字段的映射文件  hibernate.hbm.xml（存放在与Student.java同一目录下）

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="com.bjxst.hibernate.model">
    <class name="Student" table="student">
        <id name="id"></id>
        <property name="name"></property>
        <property name="age"></property>
    </class>
</hibernate-mapping>

5、最后编写测试程序StudentTest.java（存放在src下默认的包中）

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

import com.bjxst.hibernate.model.Student;

public class StudentTest {
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Student s=new Student();
		s.setId(1);
		s.setName("s1");
		s.setAge(1);
		Configuration cfg=new Configuration();
		SessionFactory sf=cfg.configure().buildSessionFactory();
		Session session=sf.openSession();
		session.beginTransaction();
		session.save(s);
		session.getTransaction().commit();
		session.close();
		sf.close();
		
	}

}

编写完后，运行StudentTest.java，运行结果为：Hibernate: insert into student (name, age, id) values (?, ?, ?)

此时查看数据库中，已存在添加的记录：

此时，一个简单的hibernate连接mysql的程序已创建成功。

 

第二种方法：使用hibernate-annotation

需要的jar包：

1、数据库端的操作

创建数据库：

create database hibernate character set utf8;

建表：

use hibernate;
create table student(id int primary key,name varchar(20),age int);

2、编写配置文件：

hibernate.cfg.xml(存放在src目录下)

<?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>

        <!-- Database connection settings -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>
        <property name="connection.username">root</property>
        <property name="connection.password">root</property>

        <!-- JDBC connection pool (use the built-in) -->
        <!-- <property name="connection.pool_size">1</property> -->

        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

        <!-- Enable Hibernate's automatic session context management -->
        <!-- <property name="current_session_context_class">thread</property>  -->

        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>

        <!-- Drop and re-create the database schema on startup -->
        <!-- <property name="hbm2ddl.auto">update</property>  -->

        <mapping resource="com/bjxst/hibernate/model/Student.hbm.xml"/>
        <mapping class="com.bjxst.hibernate.model.Teacher"/>

    </session-factory>

</hibernate-configuration>

3、封装数据库字段的类Teacher.java

package com.bjxst.hibernate.model;
import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class Teacher {
private int id;
private String name;
private String title;

@Id
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 getTitle() {
	return title;
}
public void setTitle(String title) {
	this.title = title;
}
}

4、编写测试程序TeacherTest.java(存放在src默认的包中)

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;

import com.bjxst.hibernate.model.Student;
import com.bjxst.hibernate.model.Teacher;

public class TeacherTest {
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Teacher t=new Teacher();
		t.setId(1);
		t.setName("t1");
		t.setTitle("初级");
		Configuration cfg=new AnnotationConfiguration();
		SessionFactory sf=cfg.configure().buildSessionFactory();
		Session session=sf.openSession();
		session.beginTransaction();
		session.save(t);
		session.getTransaction().commit();
		session.close();
		sf.close();
		
	}

}

运行测试程序，查看数据库结果，插入成功。