Dzmitry Rusak updated CAY-1070:
-------------------------------
Attachment: NamingFixes.patch
s.Fix bug with multiple using of one parameter.
Class name and methods named according java conventions.
> Generating Query and Procedure 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 stored procedures and mapped 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
> }
> For each ProcedureQuery and SQLTemplate query, a method would have to return a generic QueryResponse object, as we don't have enough info to tell whether the query is selecting or updating or both (although we can do something smart about SQLTemplates, such as greping for SELECT in the beginning of the query).
> public QueryResponse performQuery2(ObjectContext, 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; not yet sure how to do with with SQLTemplate or ProcedureQuery). In the future we can 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.
> * For each stored procedure that does not have at least one procedure query, create a method that builds a procedure query on the fly. Method name is based on stored procedure name.
> public QueryResponse performProcedure2(ObjectContext, Object parameter1, Object parameter2) {
> // Create ProcedureQuery
> // bind parameters and
> // run the query here
> }
> [1] http://cayenne.apache.org/doc/cgen.html
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