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https://issues.apache.org/cayenne/browse/CAY-1070?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrus Adamchik closed CAY-1070.
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Resolution: Fixed
> Generating SelectQuery Access Code
> ----------------------------------
>
> Key: CAY-1070
> URL: https://issues.apache.org/cayenne/browse/CAY-1070
> Project: Cayenne
> Issue Type: Task
> Components: Cayenne Core Library
> Affects Versions: 3.0
> Reporter: Andrus Adamchik
> Assignee: Andrus Adamchik
> Fix For: 3.0
>
> Attachments: DataMapGeneration.patch, NamingFixes.patch
>
>
> The original request for this feature was submitted as CAY-995. I am using a
> separate Jira to better formulate what needs to be done and provide the
> context. The goal to generate a flexible type-safe code to invoke mapped
> select queries.
> 1. This feature should initially target class generation with Ant (via 'cgen'
> task [1]), although backend should be done in a way that should be later
> reusable with CayenneModeler and Maven plugins (actually all code generation
> stuff is done like that, so it won't be hard to follow).
> 2. The new feature will be activated in the "datamap" cgen "mode" (default
> mode is "entity"). Until now "datamap" mode always required a custom template
> to make any sense at all. Now it will result in generating a default
> predefined Java class (with a superclass if "makepairs" is true) per DataMap.
> 3. The new standard Velocity templates need to be created for "datamap" mode
> under "resources/dotemplates/v1_2", one for singleclass generation and two
> for subclass/superclass generation. Just like with persistent Java class
> templates, datamap-subclass.vm should be an empty class inheriting from a
> generated superclass; datamap-superclass.vm and datamap-singleclass.vm should
> be essentially the same thing except for the class name.
> 4. Generated class name should be derived from DataMap name and use
> DataMap.getDefaultPackage() for the package name. All non-Java identifier
> characters in the DataMap name should be replaced (with "_" ??) when deriving
> a class name. Superclass in a makepairs generation mode should be prefixed
> with "_" (same as persistent Java classes).
> 5. Generated classes must include the following:
> * A singleton method that returns a static final instance of the class:
> protected static MyDataMap instance = new MyDataMap();
> public static MyDataMap getInstance() {
> return instance;
> }
> * A method for each mapped query. For each SelectQuery, a method would look
> like this:
> public List<EntityClass> performQuery1(ObjectContext context, Object
> parameter1, Object parameter2, ...) {
> // bind parameters and
> // run the query here
> }
>
> The number, names and order of parameters must match that of the mapped
> query (for SelectQuery that would require parsing qualifier expression to
> search for parameter nodes). also do something smart about parameter types
> (we can sort of guess them in SelectQuery), but this is not required for
> version 1 of the feature.
> [1] http://cayenne.apache.org/doc/cgen.html
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