hibernate annoation (二 创建表)2009-10-10 javaeye ericjoe为了追踪hibernate的信息 <property name="hibernate.show_sql">true</property>新建User类:@Entity @Table(name="E_USER",uniqueConstraints={ @UniqueConstraint(columnNames={"yahoo"}) }) public class User {
private int id; private String yahoo; //昵称唯一
@Id @GeneratedValue(strategy=GenerationType.AUTO) public int getId() { return id; } public void setId(int id) { this.id = id; } public String getYahoo() { return yahoo; } public void setYahoo(String yahoo) { this.yahoo = yahoo; }
}创建表 首先在hibernate.cfg.xml里配置<mapping class="com.eric.po.User"/>说明:使用annoation同样可以接受.hbm.xml文件1,以手动创建 DROP TABLE IF EXISTS `e_user`; CREATE TABLE `e_user` ( `id` int(11) NOT NULL auto_increment, `yahoo` varchar(255) default NULL, PRIMARY KEY (`id`), UNIQUE KEY `yahoo` (`yahoo`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;2,使用<property name="hbm2ddl.auto">create</property>属性来自动创建3,SchemaExport : new SchemaExport(new AnnotationConfiguration().configure()).create(true,true);create(true,true):两个参数:Java代码* @param script print the DDL to the console * @param export export the script to the databasehibernate建表语句: drop table if exists E_USER create table E_USER (id integer not null auto_increment, yahoo varchar(255), primary key (id), unique (yahoo))