Re: [HACKERS] Re: [INTERFACES] retrieving varchar size

>
> 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.

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