Support for per-adapter customization of EJBQL translator
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Key: CAY-819
URL: https://issues.apache.org/cayenne/browse/CAY-819
Project: Cayenne
Issue Type: Task
Components: Cayenne Core Library
Affects Versions: 3.0
Reporter: Andrus Adamchik
Assignee: Andrus Adamchik
Fix For: 3.0
One the important features of EJBQL query is that, just like SelectQuery its
synatx is DB-independent . Therefore we need a mechanism to customize
translation per DbAdapter. The first case that came up where we will need it:
* Null handling. Most databases support null comparison (although the result is
often different):
SELECT * FROM ARTIST WHERE ARTIST_NAME = NULL (notice "= NULL" instead of "IS
NULL)
FrontBase throws an exception. So one alternative syntax we can use for this
query on FrontBase is "SELECT * FROM ARTIST WHERE FALSE"
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