Question

我正在创建一个hibernate应用程序，我想在其中创建一个复合主键。以下是我写的映射文件：

<?xml version="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>
  <class name="Fold.ChildrenPark" table="ChildrenPark">
    <composite-id>
    <key-property name="date" not-null="true"/>
    <key-property name="valveOffTime" not-null="true"/>
    <key-property name="valveOnTime" not-null="true"/>
    </composite-id>
    <property name="overHeadTankLevelAfterFilling"/>
    <property name="overHeadTankLevelBeforeFilling"/>
    <property name="rank"/>
  </class>
</hibernate-mapping>

但我得到的例外情况如下：

 - 1689 [http-listener-1(4)] ERROR org.hibernate.util.xml.ErrorLogger -
   Error parsing XML (11) : Attribute "not-null" must be declared for
   element type "key-property". Severe:   1717 [http-listener-1(4)] WARN
   org.hibernate.util.DTDEntityResolver - recognized obsolete hibernate
   namespace http://hibernate.sourceforge.net/. Use namespace
   http://www.hibernate.org/dtd/ instead. Refer to Hibernate 3.6
   Migration Guide! Severe:   1719 [http-listener-1(4)] ERROR
   org.hibernate.util.xml.ErrorLogger - Error parsing XML (2) :
   Attribute "not-null" must be declared for element type
   "key-property". Info:   Exception in insertion of data:
   org.hibernate.InvalidMappingException: Unable to read XML

所以我想知道这段代码中缺少什么。我在网上搜索但没有找到任何有用的东西。这意味着什么？

Answer 1

有很多事情：

1 /改变你的dtd：

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

为：

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

这将删除有关过时的hibernate名称空间

的警告

2 /删除key-property的not-null属性，key属性不存在此属性，因为PK属性不能为null。

hibernate中的复合主键问题

1 个答案: