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Re: unable to call a function - Mailing list pgsql-general

From Moshe Jacobson
Subject Re: unable to call a function
Date
Msg-id CAJ4CxL=CwK2-uYZ-PJ-MSbiKLmHwxo3+mMNZsnfRioRuvaRSYA@mail.gmail.com
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In response to unable to call a function  (giozh <giozh@yahoo.it>)
Responses Re: unable to call a function
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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@yahoo.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@neadwerx.com | www.neadwerx.com

"Quality is not an act, it is a habit." -- Aristotle

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