From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | hannu(at)trust(dot)ee (Hannu Krosing) |
Cc: | hannu(at)trust(dot)ee, byronn(at)insightdist(dot)com, pgsql-hackers(at)postgreSQL(dot)org, pgsql-interfaces(at)postgreSQL(dot)org |
Subject: | Re: [HACKERS] Re: [INTERFACES] retrieving varchar size |
Date: | 1998-04-23 17:35:43 |
Message-ID: | 199804231736.NAA29768@candle.pha.pa.us |
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Thread: | |
Lists: | pgsql-hackers pgsql-interfaces |
>
> In the latter case, I would suggest an additional SQL command for open
> cursors,
> or a pseudo table for open cursor where you could do a simple select
> statement:
>
> DECLARE CURSOR FOO_CURSOR FOR SELECT * FROM MYTABLE;
>
> SELECT _FIELD_NAME,_FIELD_TYPE,_FIELD_SIZE FROM
> FOO_CURSOR_INFO_PSEUTOTABLE;
The information you want is in pg_attribute.atttypmod. It is normally
-1, but is set for char() and varchar() fields, and includes the 4-byte
length. See bin/psql/psql.c for a sample of its use.
--
Bruce Momjian | 830 Blythe Avenue
maillist(at)candle(dot)pha(dot)pa(dot)us | Drexel Hill, Pennsylvania 19026
+ If your life is a hard drive, | (610) 353-9879(w)
+ Christ can be your backup. | (610) 853-3000(h)
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