Hibernate配置subclass

在配置subclass的时候出现了

 

写道

[main] ERROR org.hibernate.util.XMLHelper - Error parsing XML: XML InputStream(26)
The content of element type "class" must match "(meta*,subselect?,cache?
,synchronize*,(id|composite-id),discriminator?,(version|timestamp)?,
(property|many-to-one|one-to-one|component|dynamic-component
|properties|any|map|set|list|bag|idbag|array|primitive-array|query-list)*,
((join*,subclass*)|joined-subclass*|union-subclass*),loader?,sql-insert?
,sql-update?,sql-delete?,filter*)"

 

我的xx.hbm.xml配置是这样的：

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<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.summit.pojo.Animal" table="animal">
<id column="id" type="long" name="id">
<generator class="uuid"></generator>
</id>
<property name="name" column="name" type="string"></property>
<discriminator type="string">
<column name="animalType"></column>
</discriminator>
<subclass name="com.summit.pojo.Dog" discriminator-value="dog">
<property name="jump" type="string"></property>
</subclass>
<subclass name="com.summit.pojo.Kitchen" discriminator-value="kitchen">
<property name="fly" column="fly" type="string"></property>
</subclass>
</class>
</hibernate-mapping>

当我把discriminator删除掉的就正确了，可是又不符合定义子类映射的要求，所以 从google上搜索，包括查看hibernate-mapping-3.0.dtd，可以看到是到class的这一段描述:

写道

<!ELEMENT class (
meta*,
subselect?,
cache?,
synchronize*,
comment?,
tuplizer*,
(id|composite-id),
discriminator?,
natural-id?,
(version|timestamp)?,
(property|many-to-one|one-to-one|component|dynamic-component|properties|any|map|set|list|bag|idbag|array|primitive-array)*,
((join*,subclass*)|joined-subclass*|union-subclass*),
loader?,sql-insert?,sql-update?,sql-delete?,
filter*,
resultset*,
(query|sql-query)*
)>

 可以看到discriminator必须要在id的后面定义，所以把discriminator改到id后面就OK了，像这样：

写道

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.summit.pojo.Animal" table="animal">
<id column="id" type="long" name="id">
<generator class="uuid"></generator>
</id>
<discriminator type="string">
<column name="animalType"></column>
</discriminator>
<property name="name" column="name" type="string"></property>
<subclass name="com.summit.pojo.Dog" discriminator-value="dog">
<property name="jump" type="string"></property>
</subclass>
<subclass name="com.summit.pojo.Kitchen" discriminator-value="kitchen">
<property name="fly" column="fly" type="string"></property>
</subclass>
</class>
</hibernate-mapping>