Message-ID: <1364.62.66.218.59.1169073199.squirrel@mail.agile.dk>
Date: Wed, 17 Jan 2007 23:33:19 +0100 (CET)
Subject: Some help with functions-syntax
From: "Jan Meyland Andersen" <jma@agile.dk>
To: pgsql-sql@postgresql.org
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I have some problem with writing a function.

I have made this function which I can't get it to work.

This is probaly a triviel question but i'm new to plsql, so this is a
showstopper for me.

DECLARE
	_relkind char;
	_RES "EMS"."KeySet";
	_WHERECLAUSE text;
BEGIN
	SELECT pgc.relkind INTO _relkind
	FROM pg_class pgc JOIN pg_namespace pgn ON pgc.relnamespace=pgn.oid
	WHERE pgn.nspname=$1 AND pgc.relname=$2;

	IF _relkind = 'r' THEN
		_WHERECLAUSE := '(fknam.nspname = ''$1'' AND fkc.relname = ''$2'')';
	END IF;

	IF _relkind = 'v' THEN
		_WHERECLAUSE := '';
	END IF;

	FOR _RES IN
		SELECT	fknam.nspname AS "FKTABLE_SCHEM",
			fkc.relname AS "FKTABLE_NAME",
			fka.attname AS "FKCOLUMN_NAME",
			pknam.nspname AS "PKTABLE_SCHEM",
			pkc.relname AS "PKTABLE_NAME",
			pka.attname AS "PKCOLUMN_NAME",
			fkcon.conname AS "FK_NAME",
			pkcon.conname AS "PK_NAME",
			CASE
				WHEN pkcon.contype = 'p' THEN 'PRIMARY'
				WHEN pkcon.contype = 'u' THEN 'UNIQUE'
			END AS "UNIQUE_OR_PRIMARY"
		FROM 	pg_constraint AS fkcon
			JOIN pg_namespace AS fknam ON fkcon.connamespace=fknam.oid
			JOIN pg_class AS fkc ON fkc.oid=fkcon.conrelid
			JOIN pg_attribute fka ON fka.attrelid=fkc.oid AND fka.attnum =
ANY(fkcon.conkey)
			JOIN pg_constraint AS pkcon ON fkcon.confrelid=pkcon.conrelid AND
fkcon.confkey=pkcon.conkey
			JOIN pg_namespace pknam ON pkcon.connamespace=pknam.oid
			JOIN pg_class pkc ON pkc.oid=fkcon.confrelid
			JOIN pg_attribute pka ON pka.attrelid=pkc.oid AND pka.attnum =
some(pkcon.conkey)
		WHERE 	(
			(pkcon.conkey[1] = pka.attnum AND fkcon.conkey[1] = fka.attnum) OR
			(pkcon.conkey[2] = pka.attnum AND fkcon.conkey[2] = fka.attnum) OR
			(pkcon.conkey[3] = pka.attnum AND fkcon.conkey[3] = fka.attnum) OR
			(pkcon.conkey[4] = pka.attnum AND fkcon.conkey[4] = fka.attnum) OR
			(pkcon.conkey[5] = pka.attnum AND fkcon.conkey[5] = fka.attnum)
			) AND || _WHERECLAUSE
 		LOOP
		RETURN NEXT _RES;
	END LOOP;
	RETURN;
END;

I get the following error:

ERROR: operator does not exist: || text
SQL state: 42883
Hint: No operator matches the given name and argument type(s). You may
need to add explicit type casts.


How do I solve this?

I also have a question about how to write CASE-statement? I am only able
to use if.

Regards

Jan