HIBERNATE:Hibernate 学习一－－注解方式自动建表
一.必备包
? 1.commons-collections-3.2.1.jar
? 2.ejb3-persistence.jar
? 3.hibernate3.jar
? 4.hibernate-jpa-2.0-api-1.0.1.Final.jar
? 5.javassist-3.15.0-GA.jar
? 6.jboss-logging-3.1.0.GA.jar
? 7.jboss-transaction-api_1.1_spec-1.0.0.Final.jar
? 8.slf4j-api-1.6.1.jar
? 9.数据库驱动包(MySql:mysql-connector-java-5.1.9-bin.jar)
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二.配置文件hibernate.cfg.xml
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<?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> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql://localhost:3306/DREAM_20121208</property> <property name="connection.username">root</property> <property name="connection.password">123456</property> <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property> <property name="show_sql">true</property> <property name="hbm2ddl.auto">update</property> <property name="hibernate.format_sql">true</property> <property name="hibernate.current_session_context_class">thread</property> <mapping /> </session-factory></hibernate-configuration>
?三.实体 User.java
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@Entity@Table(name = "T_USER")public class User { private int id; private String username; private int age; @Id @GenericGenerator(name = "generator", strategy = "increment") @GeneratedValue(generator = "generator") @Column(name = "I_ID") public int getId() { return id; } public void setId(int id) { this.id = id; } @Column(name = "STR_USER_NAME", length = 20) public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } @Column(name = "I_AGE") public int getAge() { return age; } public void setAge(int age) { this.age = age; }}?四.工具类
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public class HibernateUtil { private static final SessionFactory sessionFactory; static { try { sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory(); } catch (Throwable ex) { System.err.println("Initial SessionFactory creation failed." + ex); throw new ExceptionInInitializerError(ex); } } public static SessionFactory getSessionFactory() { return sessionFactory; }}?五.测试类:Test.java
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public class Test { public static void main(String[] args) { createAndStorePerson(); HibernateUtil.getSessionFactory().close(); } private static void createAndStorePerson() { Session session = HibernateUtil.getSessionFactory().getCurrentSession(); session.beginTransaction(); User user = new User(); user.setUsername("test"); user.setAge(18); session.save(user); session.getTransaction().commit(); }}?六.创建数据库(要与配置文件hibernate.cfg.xml中相符)
?七.结束
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