hibernate的学习

1、maven配置文件（pom.xml）

        <dependency>
      	    <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
  	    <version>5.1.21</version>
   	</dependency>
   	
   	<dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>5.2.6.Final</version>
        </dependency>

2、建表

登录表，存放用户名与密码

3、文件结构

4、userlogin

public class userlogin {
public String username;
public String password;
public String getUsername() {
	return username;
}
public void setUsername(String username) {
	this.username = username;
}
public String getPassword() {
	return password;
}
public void setPassword(String password) {
	this.password = password;
}

}

5、userlogin.hbm.xml

<?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="wyj.hibernateLearn.userlogin" table="userlogin">  
    <id name="username">  
     <generator class="assigned"></generator>  
    </id>  

    <property name="password"></property>  
  </class>  

 </hibernate-mapping>

name是类，table是表名

6、hibernate.cfg.xml

<?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.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/userlogin</property>
        <property name="connection.username">用户名</property>
        <property name="connection.password">密码</property>
        <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
        <property name="show_sql">true</property>
        <mapping resource="userlogin.hbm.xml"/>  
    </session-factory>

</hibernate-configuration>

有可能会出现乱码问题：将<property name="connection.url">jdbc:mysql://localhost:3306/userlogin</property>

这一句改成<property name="connection.url">jdbc:mysql://localhost:3306/userlogin?useUnicode=true&characterEncoding=UTF-8</property>

指定连接属性

7、向数据库插入

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

public class storedata {
	public static void main(String[] args) {  

        Configuration cfg=new Configuration();  
        cfg.configure("hibernate.cfg.xml");

        SessionFactory factory=cfg.buildSessionFactory();  

        Session session=factory.openSession();  

        Transaction t=session.beginTransaction();  

        userlogin ul=new userlogin();
        ul.setUsername("余");
        ul.setPassword("123456");
        
        session.persist(ul);

        t.commit();
        session.close();  

        System.out.println("successfully saved");  
	}
}

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