标签：hibernnate 入门 hibernate.cfg.xml
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 >
<!-- Database connection settings -->
<property name= "connection.driver_class">com.mysql.jdbc.Driver </property >
<property name= "connection.url">jdbc:mysql://localhost/hibernate</property >
<property name= "connection.username">root</property >
<property name= "connection.password">1234rewq</property >
<!-- JDBC connection pool (use the built-in) -->
<property name= "connection.pool_size">1</property >
<!-- SQL dialect 对应数据库语言 -->
<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 -->
<!-- 是否打印sql语句在控制台 -->
<property name ="show_sql">true</ property>
<!-- 是否在控制台按格式化输出 sql语句 -->
<property name ="format_sql">true</ property>
<!-- Drop and re-create the database schema on startup -->
<property name ="hbm2ddl.auto">update</ property>
<!-- 实体类与数据库映射 -->
<mapping resource= "com/company/project/bean/Book.hbm.xml" />
</session-factory >
</hibernate-configuration>
----------------------------------------------------------------------------
Book.hbm.xml
<?xmlversion="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.company.project.bean">
<!-- name对应类里的属性 table对应数据表的内容 catalog对应数据的名字 -->
<class name ="Book" table="book" catalog= "hibernate">
<id name ="bookid" column="bookid" type= "java.lang.Integer">
<!-- <generator>子元素是一个Java类的名字， 用来为该持久化类的实例生成唯一的标识。 -->
<generator class ="native"></generator>
</id >
<property name ="bookname" column="bookname" type= "java.lang.String" length ="20"/>
<property name ="bookprice" column="bookprice" type= "java.lang.Float"/>
<property name ="author" column= "author" type= "java.lang.String" length ="20"/>
</class >
</hibernate-mapping>
-----------------------------------------------------------------------------------
实体类
package com.company.project.bean;
public class Book {
private String bookname;
private int bookid;
private float bookprice;
private String author;
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this. author = author;
}
public String getBookname() {
return bookname;
}
public void setBookname(String bookname) {
this. bookname = bookname;
}
public int getBookid() {
return bookid;
}
public void setBookid(int bookid) {
this. bookid = bookid;
}
public float getBookprice() {
return bookprice;
}
public void setBookprice( float bookprice) {
this. bookprice = bookprice;
}
}
-----------------------------------------------------------------------------------
测试类
package com.company.project.test;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.classic.Session;
import com.company.project.bean.Book;
public class TestMain {
public static void main(String[] args) {
Configuration config = new Configuration();
config.configure(); // 加载配置文件 默认加载hibernate.cfg.xml
SessionFactory sessionFactory = config.buildSessionFactory(); // 得到一个SessionFactory
Session session = sessionFactory.openSession(); // 通过sessionFactory
// 创建连接session
// 即JDBC中的Conncetion
Book book = new Book();
book.setBookname( "hibernate 3.3");
book.setBookprice(118.0f);
book.setAuthor( "conan");
session.save( book); // 添加数据 由hibernate完成
//增加一个事务，只有提交了才会从 hibernate缓存中添加到数据库中
session.beginTransaction().commit();
Query query = session.createQuery( "from Book"); //查询
List<?> list = query.list();
for (Object o : list) {
Book b = (Book) o;
System. out.println( b.getBookid()+ " "+b .getBookname()+" " +b .getBookprice()+" "+b .getAuthor());
}
}
}
标签：hibernnate 入门 hibernate.cfg.xml
原文地址：http://icola.blog.51cto.com/5412204/1725779
