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Hibernate入门

2024-07-05 10:45:36   225人阅读

okay，了解了struts2后开始搭建hibernate环境

eclipse 4.3.2

jdk 1.7.0_45

hibernate 4.3.5

mysql 5.1.67

准备好上面的环境，安装hibernate（拷贝hibernate所需lib-->requered-->jar包和mysql的java驱动jar包拷到lib里面）

在数据库新建一个数据库hibernate,创建usertable表字段有name,password

在eclipse中新建一个java project Hiernate

在src目录下新建一个hibernate.cfg.xml文件（可以在文档里面找到基本的配置，然后根据自己的情况修改一下）

<?xml version=‘1.0‘ encoding=‘utf-8‘?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/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"></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.internal.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/gxf/beans/user.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

在src目录下新建一个bean，User.java

package com.gxf.beans;

public class User {
    private String name;
    private String password;
    
    public User(String name, String password) {
        super();
        
        this.name = name;
        this.password = password;
    }
    
    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;
    }
    
}

在与bean同目录下新建一个user.hbm.xml（这里可以在文档里面找到，根据自己的bean和数据库表进行修改）

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping PUBLIC
 3 "-//Hibernate/Hibernate Mapping DTD//EN"
 4 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
 5 
 6 <hibernate-mapping package="com.gxf.beans">
 7 
 8     <class name="User" table="usertable">
 9         <id name="name"> 
10         </id>
11         <property name="password"/>
12     </class>
13 
14 </hibernate-mapping>

在src目录下新建一个测试类，Test.java

 1 package com.gxf.test;
 2 
 3 import org.hibernate.HibernateException;
 4 import org.hibernate.Session;
 5 import org.hibernate.SessionFactory;
 6 import org.hibernate.Transaction;
 7 import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
 8 import org.hibernate.cfg.Configuration;
 9 import org.hibernate.service.ServiceRegistry;
10 
11 import com.gxf.beans.User;
12 
13 public class Test {
14 
15     public static void main(String[] args) {
16         try {
17             Configuration configuration = new Configuration().configure();
18             ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
19             SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);
20             Session session = sessionFactory.openSession();
21             
22             
23             Transaction tx = session.beginTransaction();
24             User userToSave = new User("lisi","luckyzhangsan");
25             session.save(userToSave);
26             tx.commit();
27             session.close();
28            } catch (HibernateException e) {
29             e.printStackTrace();
30            }
31         }
32 
33     }

最后运行Test.java，控制台没有报错，病输出对应的sql语句。到数据库中执行查找命令，插入成功

这里只是为了测试hibernate环境，熟悉hibernate的工作流程，比较粗糙


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