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<id name="id" column="CATEGORY_ID" type="long"> <generator class="&idgenerator;"/> </id>
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The &idgenerator; value is called an entity placeholder. You can define its value at the top of the XML file as an entity declaration, as part of the document type definition:
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< xml version="1.0" > <!DOCTYPE hibernate-mapping SYSTEM
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Object/relational mapping metadata
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"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" [ <!ENTITY idgenerator "auction.custom.MyOracleGenerator"> ]>
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The XML parser will now substitute the placeholder on Hibernate startup, when mapping files are read. You can take this one step further and externalize this addition to the DTD in a separate file and include the global options in all other mapping files:
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< xml version="1.0" > <!DOCTYPE hibernate-mapping SYSTEM "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" [ <!ENTITY % globals SYSTEM "classpath://persistence/globals.dtd"> %globals; ]>
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This example shows the inclusion of an external file as part of the DTD. The syntax, as often in XML, is rather crude, but the purpose of each line should be clear. All global settings are added to the globals.dtd file in the persistence package on the classpath:
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<!ENTITY idgenerator "auction.custom.MyOracleGenerator"> <!-- Add more options if needed... -->
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To switch from Oracle to a different database system, just deploy a different globals.dtd file. Often, you need not only substitute an XML element or attribute value but also to include whole blocks of mapping metadata in all files, such as when many of your classes share some common properties, and you can t use inheritance to capture them in a single location. With XML entity replacement, you can externalize an XML snippet to a separate file and include it in other XML files. Let s assume all the persistent classes have a dateModified property. The first step is to put this mapping in its own file, say, DateModified.hbm.xml:
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<property name="dateModified" column= DATE_MOD type="timestamp"/>
This file needs no XML header or any other tags. Now you include it in the mapping file for a persistent class:
< xml version="1.0" > <!DOCTYPE hibernate-mapping SYSTEM "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" [
Domain models and metadata
<!ENTITY datemodified ]> <hibernate-mapping> <class name="Item" table="ITEM" <id ...> &datemodified; ... </class> SYSTEM "classpath://model/DateModified.hbm.xml">
The content of DateModified.hbm.xml will be included and be substituted for the &datemodified; placeholder. This, of course, also works with larger XML snippets. When Hibernate starts up and reads mapping files, XML DTDs have to be resolved by the XML parser. The built-in Hibernate entity resolver looks for the hibernate-mapping-3.0.dtd on the classpath; it should find the DTD in the hibernate3.jar file before it tries to look it up on the Internet, which happens automatically whenever an entity URL is prefixed with http://hibernate.sourceforge.net/. The Hibernate entity resolver can also detect the classpath:// prefix, and the resource is then searched for in the classpath, where you can copy it on deployment. We have to repeat this FAQ: Hibernate never looks up the DTD on the Internet if you have a correct DTD reference in your mapping and the right JAR on the classpath. The approaches we have described so far XML, JDK 5.0 annotations, and XDoclet attributes assume that all mapping information is known at development (or deployment) time. Suppose, however, that some information isn t known before the application starts. Can you programmatically manipulate the mapping metadata at runtime
Manipulating metadata at runtime
It s sometimes useful for an application to browse, manipulate, or build new mappings at runtime. XML APIs like DOM, dom4j, and JDOM allow direct runtime manipulation of XML documents, so you could create or manipulate an XML document at runtime, before feeding it to the Configuration object. On the other hand, Hibernate also exposes a configuration-time metamodel that contains all the information declared in your static mapping metadata. Direct programmatic manipulation of this metamodel is sometimes useful, especially for applications that allow for extension by user-written code. A more drastic approach would be complete programmatic and dynamic definition of the mapping metadata, without any static mapping. However, this is exotic and
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