On 07/04/2013 08:53 AM, giozh wrote:
i've write this function that search if inside a specified table there's a
specified value:
CREATE FUNCTION check_if_if_exist(id INTEGER, table_name character(50),
table_column character(20) ) RETURNS BOOLEAN AS $$
BEGIN
RETURN EXECUTE 'SELECT EXISTS(SELECT * FROM table_name WHERE
table_column =
id)';
END;
$$ LANGUAGE plpgsql
but when i try to call it i always receive an error and the function will
not call. where is the problem?
Try:
CREATE OR REPLACE FUNCTION utility.check_if_if_exist(id integer,
table_name character, table_column character)
RETURNS boolean
LANGUAGE plpgsql
AS $function$
DECLARE
_exists boolean;
BEGIN
EXECUTE 'SELECT EXISTS(SELECT * FROM '|| table_name || ' WHERE '
|| table_column ||' =
$1)' INTO _exists USING id ;
RETURN _exists;
END;
More information here:
http://www.postgresql.org/docs/9.2/interactive/plpgsql-statements.html#PLPGSQL-STATEMENTS-EXECUTING-DYN
--
Adrian Klaver
adrian.kla...@gmail.com
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