Re: svn commit: r901627 - in /cayenne/main/trunk: docs/doc/src/main/resources/ framework/cayenne-jdk1.5-unpublished/src/main/java/org/apache/cayenne/exp/parser/ framework/cayenne-jdk1.5-unpublished/src/main/jjtree/org/apache/cayenne/ejbql/ framework/

From: Andreas Hartmann (andrea..pache.org)
Date: Thu Jan 21 2010 - 16:31:24 EST

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    Am 21.01.10 21:54, schrieb Andrus Adamchik:
    >
    > On Jan 21, 2010, at 10:38 PM, Andrey Razumovsky wrote:
    >
    >> So, following specification, this cannot be performed anyhow?
    >
    > No. But the idea I guess is that pattern is not another column value. It
    > is always a literal.

    Yes, the tutorial emphasizes this: "The pattern value is a string
    literal that may contain wildcard characters."

    http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/EJBQL5.html

    I find this restriction rather strange, but maybe the authors couldn't
    think of a reasonable real-world scenario which requires a dynamically
    generated pattern.

    -- Andreas

    >
    >>
    >> I agree subselects in LIKE is not good, then maybe let's change that to
    >> input_parameter() | string_literal() | functions_returning_strings() ?
    >> Specification does not say what to do if right part is not input
    >> parameter
    >> or string literal. So is it really bad if we do more than specification
    >> says?
    >
    > I think it doesn't buy us much. LIKE is a rather special case IMO, and
    > this is reflected in the spec.
    >
    >> Another weird thing is that pattern_value() unlike other expressions
    >> is not
    >> described in BNF on pages 109-112..
    >
    > True. It is described in the text only. The EJBQL BNF is rather sketchy
    > in some parts.
    >
    > Andrus
    >
    >

    -- 
    Andreas Hartmann, CTO
    BeCompany GmbH
    http://www.becompany.ch
    Tel.: +41 (0) 43 818 57 01
    



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