| [Teneo/Hibernate] Delete many objects from database at once [message #617975] |
Thu, 01 May 2008 13:02 |
 Kai Schlamp
Messages: 344
Registered: July 2009 |
Senior Member |
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Hy. This is more of a hibernate HQL problem, than a Teneo problem. But I
hope that someone perhaps has an answer here, as the Hibernate forum
wasn't too informative.
I have an EMF class named "Document", that has an attribute "properties"
of type "StringToStringMap". This model is mapped with hbm2ddl to my
database, so that there is a table for "Document" and one for
"properties". The last one has a "Document" id as foreign id. (For more
details please see Hibernate mapping file below.)
Now I want to delete a large number of objects at once. I have their id's
for that task. With normal SQL this would be no problem at all. With HQL
it isn't that easy (but I like to use that cause of database independency).
Deleting each object one by one (with session.delete()) is not an option,
as it takes far too long (I have to sequentially fetch each object by id
and then delete it).
My other thought was to use bulk delete (see
http://www.hibernate.org/hib_docs/v3/reference/en/html/batch .html#batch-direct
... delete Document as doc where doc.id = 33, or something like that), but
it fails cause of a foreign key exception as it doesn't handle the
dependent properties table.
So it seems that bulk delete doesn't use the 'cascade="all,delete-orphan"'
and so doesn't delete cascading.
Is there another option do delete many objects at once?
Kai
extract from the hibernate mapping file:
<class name="org.pubcurator.documentor.documentmodel.impl.DocumentImpl "
entity-name="Document" abstract="false" lazy="false"
discriminator-value="Document" table="`document`">
<meta attribute="eclassName">Document</meta>
<meta
attribute="epackage">http://www.pubcurator.org/documentor/documentmodel</meta>
<id name="id" type="long" unsaved-value="0">
<column not-null="true" unique="false" name="`id`"/>
<generator class="native"/>
</id>
<discriminator column="`dtype`" type="string"/>
<version name="e_version" column="e_version"
access=" org.eclipse.emf.teneo.hibernate.mapping.property.VersionProp ertyHandler ">
<meta attribute="syntheticVersion">true</meta>
</version>
<map name="properties" lazy="true" cascade="all,delete-orphan">
<key update="true">
<column name="`document_properties_id`" not-null="false"
unique="false"/>
</key>
<map-key type="java.lang.String"/>
<element type="java.lang.String" not-null="false" unique="false">
<column not-null="false" unique="false" name="`value`" length="10000"/>
</element>
</map>
</class>
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