Re: unable to call a function

You are passing the literal value "table_name" as the table, and
"column_name" as the column.
You need to concatenate the substituted values onto the string with the ||
operator:

return execute 'select exists(select * from ' || quote_ident(table_name) ||
' where ' || quote_ident(table_column) || ' = ' || id || ')';

(not tested)

On Thu, Jul 4, 2013 at 11:53 AM, giozh <giozh(at)yahoo(dot)it> 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?
>
>
>
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--
Moshe Jacobson
Nead Werx, Inc. | Manager of Systems Engineering
2323 Cumberland Parkway, Suite 201 | Atlanta, GA 30339
moshe(at)neadwerx(dot)com | www.neadwerx.com

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