使用Hibernate例子annotations
下载hibernate-release-4.1.3.Final.tgz
例子在这里：
hibernate-release-4.1.3.Final\documentation\quickstart\en-US\html\files\hibernate-tutorials.zip
这里说关于annotations的事。
复制hibernate-release-4.1.3.Final\project\etc\log4j.properties到
hibernate-tutorials\annotations\src\test\resources中，
这样，可以控制log4j，省得运行时输出一堆log。
?
log4j.properties中，把log4j.logger.org.hibernate=debug改成log4j.logger.org.hibernate=warn
?
log就会干干净净。
============修改hibernate.cfg.xml，符合自己的数据库信息? ? ? ? <property name="connection.driver_class">com.mysql.jdbc.Driver</property>? ? ? ? <property name="connection.url">jdbc:mysql://ip地址:端口/数据库名字?useUnicode=true&characterEncoding=UTF-8</property>?
============增加一个map类
在hibernate.cfg.xml中加：
<mapping name="code"><?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://aa:2222/dd?useUnicode=true&characterEncoding=UTF-8</property> <property name="connection.username">ff</property> <property name="connection.password">ff</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> <!-- 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> <!-- Names the annotated entity class --> <mapping name="code">package org.hibernate.tutorial.annotations;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.Id;import javax.persistence.Table;@Entity@Table(name = "food_item")public class FoodItem2 { @Id @Column(name = "foodItem_Id") public long getFoodItemId() { return _foodItemId; } public void setFoodItemId(long foodItemId) { _foodItemId = foodItemId; } @Column(name = "name_str") public String getName() { return _name; } public void setName(String name) { _name = name; } @Column(name = "points_num") public int getPoints() { return _points; } public void setPoints(int points) { _points = points; } private long _foodItemId; private String _name; private int _points; public String toString() { return _foodItemId + ", " + _name + ", " + _points; }}?A2.java
package org.hibernate.tutorial.annotations;import java.util.List;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;public class A2 { private SessionFactory sessionFactory; protected void setUp() throws Exception { // A SessionFactory is set up once for an application sessionFactory = new Configuration().configure().buildSessionFactory(); } protected void tearDown() throws Exception { if (sessionFactory != null) { sessionFactory.close(); } } @SuppressWarnings({ "unchecked" }) public void testBasicUsage() { Session session = sessionFactory.openSession(); session.setDefaultReadOnly(true); session.beginTransaction(); List result = session.createQuery("from FoodItem2").list(); for (FoodItem2 event : (List<FoodItem2>) result) { System.out.println(event); } session.getTransaction().commit(); session.close(); } public static void main(String[] args) throws Exception { A2 a1 = new A2(); a1.setUp(); a1.testBasicUsage(); a1.tearDown(); }}?
树叶，阳光