1.类库:
apache的commons除外
<classpathentry kind="lib" path="test/lib/hibernate3.jar"/>
<classpathentry kind="lib" path="test/lib/hibernate-entitymanager.jar"/>
<classpathentry kind="lib" path="test/lib/jboss-archive-browsing.jar"/>
<classpathentry kind="lib" path="test/lib/dom4j-1.6.1.jar"/>
<classpathentry kind="lib" path="test/lib/hibernate-annotations.jar"/>
<classpathentry kind="lib" path="test/lib/hibernate-commons-annotations.jar"/>
<classpathentry kind="lib" path="test/lib/javassist.jar"/>
<classpathentry kind="lib" path="test/lib/cglib-2.1.3.jar"/>
<classpathentry kind="lib" path="test/lib/asm.jar"/>
<classpathentry kind="lib" path="test/lib/asm-attrs.jar"/>
<classpathentry kind="lib" path="test/lib/antlr-2.7.6.jar"/>
2.persistence.xml
<persistence-unit name="rmp" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<properties>
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.format_sql" value="true" />
<property name="hibernate.dialect"
value="org.hibernate.dialect.Oracle9iDialect" />
<property name="hibernate.connection.driver_class"
value="oracle.jdbc.OracleDriver" />
<property name="hibernate.connection.url"
value="jdbc:oracle:thin:@172.16.3.3:1521:ngrm" />
<property name="hibernate.connection.username" value="xxx" />
<property name="hibernate.connection.password"
value="xxx123" />
</properties>
</persistence-unit>
3.问题
1.重复属性映射问题,特别烦
@MapSuperClass
public class A {
@Transistence
public String getA11()
}
}
@Entity
@Table(name="...")
public class AA extends A {
@Transistce
@Override
public String getA11() {
}
}
要定义两次@Transistce
2.new 构造器问题
select distinct new com.xxx.A(a.id, a.ss) from AA a where a.ddd=?1 and ..
为啥一定要采用通用构造器来装载数据？这样最致命的问题是如果一天要改SQL，则要改构造函数，并且如果选出来的字段比较多，构造函数就没法看懂了
完全可以通过缺省构造器实例化，通过其它方式来设值．
其实这一点就是openJPA也没有解决好，主要是不支持别名造成的
3.uuid-hex主键生成器,为啥要用
@GeneratedValue(generator = "system-uuid")
@GenericGenerator(name = "system-uuid", strategy = "uuid.hex"),该处要引入一个Hibernate的类,以后就只能在职Hibernate的JPA上跑了,受限
而OpenJPA只用 @GeneratedValue(generator = "uuid-hex")要简单一些
4.优点
1. 验证器部分,但标记也实在太多了,我现在有点讨厌它