java barcode library Object/relational mapping metadata in Java

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Object/relational mapping metadata
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Whether you use XML files, JDK 5.0 annotations, or XDoclet, you ll often notice that you have to duplicate metadata in several places. In other words, you need to add global information that is applicable to more than one property, more than one persistent class, or even the whole application.
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Handling global metadata
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Consider the following situation: All of your domain model persistent classes are in the same package. However, you have to specify class names fully qualified, including the package, in every XML mapping file. It would be a lot easier to declare the package name once and then use only the short persistent class name. Or, instead of enabling direct field access for every single property through the access="field" mapping attribute, you d rather use a single switch to enable field access for all properties. Class- or package-scoped metadata would be much more convenient. Some metadata is valid for the whole application. For example, query strings can be externalized to metadata and called by a globally unique name in the application code. Similarly, a query usually isn t related to a particular class, and sometimes not even to a particular package. Other application-scoped metadata includes user-defined mapping types (converters) and data filter (dynamic view) definitions. Let s walk through some examples of global metadata in Hibernate XML mappings and JDK 5.0 annotations. Global XML mapping metadata If you check the XML mapping DTD, you ll see that the <hibernate-mapping> root element has global options that are applied to the class mapping(s) inside it some of these options are shown in the following example:
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<hibernate-mapping schema="AUCTION" default-lazy="false" default-access="field" auto-import="false"> <class ...> ... </class> </hibernate-mapping>
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The schema attribute enables a database schema prefix, AUCTION, used by Hibernate for all SQL statements generated for the mapped classes. By setting defaultlazy to false, you enable default outer-join fetching for some class associations, a
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Domain models and metadata
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topic we ll discuss in chapter 13, section 13.1, Defining the global fetch plan. (This default-lazy="true" switch has an interesting side effect: It switches to Hibernate 2.x default fetching behavior useful if you migrate to Hibernate 3.x but don t want to update all fetching settings.) With default-access, you enable direct field access by Hibernate for all persistent properties of all classes mapped in this file. Finally, the auto-import setting is turned off for all classes in this file. We ll talk about importing and naming of entities in chapter 4, section 4.3, Class mapping options.
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Mapping files with no class declarations Global metadata is required and present in any sophisticated application. For example, you may easily import a dozen interfaces, or externalize a hundred query strings. In large-scale applications, you often create mapping files without actual class mappings, and only imports, external queries, or global filter and type definitions. If you look at the DTD, you can see that <class> mappings are optional inside the <hibernate-mapping> root element. Split up and organize your global metadata into separate files, such as AuctionTypes.hbm.xml, AuctionQueries.hbm.xml, and so on, and load them in Hibernate s configuration just like regular mapping files. However, make sure that all custom types and filters are loaded before any other mapping metadata that applies these types and filters to class mappings.
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Let s look at global metadata with JDK 5.0 annotations. Global annotation metadata Annotations are by nature woven into the Java source code for a particular class. Although it s possible to place global annotations in the source file of a class (at the top), we d rather keep global metadata in a separate file. This is called package metadata, and it s enabled with a file named package-info.java in a particular package directory:
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@org.hibernate.annotations.TypeDefs({ @org.hibernate.annotations.TypeDef( name="monetary_amount_usd", typeClass = MonetaryAmountType.class, parameters = { @Parameter(name="convertTo", value="USD") } ), @org.hibernate.annotations.TypeDef( name="monetary_amount_eur", typeClass = MonetaryAmountType.class, parameters = { @Parameter(name="convertTo", value="EUR") } ) })
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