thank you thank you thank you thank you thank you. I can feel my hair
growing back already.
Patrick Hatcher
Macys.Com
Josh Berkus
<josh@agliodbs To: "Patrick Hatcher" <PHatcher@macys.com>, pgsql-novice@postgresql.org
.com> cc:
Subject: Re: [NOVICE] Escaping ' in a function
08/27/2002
04:13 PM
Please respond
to josh
Patrick,
> I'm trying to create a function that passes a string that will need to be
> quoted. I finally figured out how many single quotes I needed and as a
> test, I've shown it in v_sql. However, I now need to do the same thing
for
> my FOR...LOOP query.
Ah, the classic qouted-quoted-quoted string problem.
Here's what I sometimes do for these procedures:
1. Build the procedure, without doubling any quotes.
2. Use search-and-replace on just the string value to double those quotes.
3. Use seach-and-replace on the whole procedure to double all quotes.
I find that this is more likely to yield me the correct number of quotes.
> CREATE or REPLACE FUNCTION recompileview(varchar) RETURNS varchar AS '
>
> DECLARE
> tblname ALIAS FOR $1;
> old_view RECORD;
> v_sql varchar;
>
> begin
> /* This is what I need */
> v_sql := ''Select * from pg_views where definition ~* '''''' || tblname
||
> '''''''' ;
>
> FOR old_view in Select * from pg_views where definition ~*
> ''''tblname'''''' LOOP
Use:
FOR old_view IN SELECT * FROM pg_views WHERE definition ~* tblname LOOP
No quotes are necessary with this version
Or:
FOR old_view IN EXECUTE v_sql LOOP
BTW, this procedure is going to cause havoc if you have views referencing
other views. They won't necessarily be re-created in order.
--
-Josh Berkus
Aglio Database Solutions
San Francisco