[jira] Commented: (CAY-1380) Support for Escaped LIKE Clauses in Expressions

["Andrew Lindesay (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CAY-1380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12806430#action_12806430 ] 

Andrew Lindesay commented on CAY-1380:
--------------------------------------

It seems that some databases have tighter restrictions on where this escape can go; hold off on applying this patch until I can resolve that.

> Support for Escaped LIKE Clauses in Expressions
> -----------------------------------------------
>
>                 Key: CAY-1380
>                 URL: https://issues.apache.org/jira/browse/CAY-1380
>             Project: Cayenne
>          Issue Type: New Feature
>    Affects Versions: 3.1M1
>            Reporter: Andrew Lindesay
>         Attachments: patch-for-like-escaping-29jan2010.diff
>
>
> At present in Cayenne, by using Expressions, it is not possible to escape LIKE clauses.  So if somebody enters FOO%BAR into a client all you can do is to strip out the %.  This is a bit tricky to work around.  The JDBC approach is allow you to append some extra text to the operand in order to define an escape character like this;
> SELECT a FROM tabA WHERE a LIKE '%=_' {escape '='}
> So, I added an instance variable to "PatternMatchNode" to carry the escape char and then modified "QueryAssemblerHelper" to append this to the operand if it is present.  See attached patch

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