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Update TODO for LIKE/ESCAPE.

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Bruce Momjian 2000-10-12 01:23:37 +00:00
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From zalman@netcom.com Tue Mar 16 18:01:18 1999
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From: Zalman Stern <zalman@netcom.com>
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Subject: Re: [SQL] How match percent sign in SELECT using LIKE?
To: maillist@candle.pha.pa.us (Bruce Momjian)
Date: Tue, 16 Mar 1999 14:55:33 -0800 (PST)
Cc: zalman@netcom.com, herouth@oumail.openu.ac.il, pgsql-sql@postgreSQL.org
In-Reply-To: <199903162226.RAA20904@candle.pha.pa.us> from "Bruce Momjian" at Mar 16, 99 05:26:09 pm
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Bruce Momjian wrote:
> That is also an excellent idea. Just convert their escape to \ inside
> the parser. Of course, they still have to use \\ to get a \, as in any
> string. Great idea.
You can even make it fully compliant if you want. (There are of course
backward compatibility problems. I'm not sure what the Postgres policy is
on this.)
- If the escape character is backslash, do nothing.
- Otherwise, turn all backslashes in the string to double backslashes.
- If the escape character is not set, stop here.
- Turn all occurences of the escape character into a backslash except
where the escape character is doubled, where it should be made into a
single occurence.
(Optionally, if "\n" is just an 'n' character, you can handle double
occurences of the escape character by turning the first one into a
backslash.)
Probably the best bet for PostgreSQL programmers is to always code Like
clauses with an ESCAPE '\' (or however its written).
I really wish they'd chosen a character other than underscore for the
"match one" wildcard... Is there any standard practice for seperating words
in table names?
-Z-