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POSelect and use one column
 

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    <p>Please consider the following (working) stored procedure. This function receives an integer as its first parameter, indicating which <code>privilegeid</code> has to be checked against the current user. Privileges are stored in the table <code>privileges</code> and consist of an id and a name (varchar).</p> <p>Each privilege belongs to one or more <code>roles</code> stored in <code>users_roles</code>. Each user is assigned to one or more roles. This function retrieves all roles assigned to <code>current_user</code> and checks them, like said, against the given priviligeid.</p> <pre><code>CREATE OR REPLACE FUNCTION "public"."has_privilege" (in int4) RETURNS bool AS $BODY$ DECLARE asked_privilegeid ALIAS FOR $1; userid int; role_row users_roles%rowtype; privilege_row privileges%rowtype; BEGIN EXECUTE 'SELECT userid FROM users WHERE username=$1' INTO userid USING current_user; FOR role_row IN SELECT * FROM users_roles WHERE userid=userid LOOP IF role_row.roleid = 1 THEN return TRUE; END IF; FOR privilege_row IN SELECT * FROM privileges WHERE roleid=role_row.roleid LOOP IF privilege_row.privilegeid = asked_privilegeid THEN return TRUE; END IF; END LOOP; END LOOP; return FALSE; END $BODY$ LANGUAGE 'plpgsql' </code></pre> <p>However, this code isn't a efficient as it could be considering it retrieves <em>all</em> rowvalues for <code>users_roles</code> and <code>privileges</code>. I tried to write the procedure as following, but it doesn't seem to work:</p> <pre><code>CREATE OR REPLACE FUNCTION "public"."has_privilege" (in int4) RETURNS bool AS $BODY$ DECLARE asked_privilegeid ALIAS FOR $1; privilegeid int; userid int; roleid int; //role_row users_roles%rowtype; //privilege_row privileges%rowtype; BEGIN EXECUTE 'SELECT userid FROM users WHERE username=$1' INTO userid USING current_user; FOR roleid IN SELECT roleid FROM users_roles WHERE userid=userid LOOP IF roleid = 1 THEN return TRUE; END IF; FOR privilegeid IN SELECT privilegeid FROM privileges WHERE roleid=roleid LOOP IF privilegeid = asked_privilegeid THEN return TRUE; END IF; END LOOP; END LOOP; return FALSE; END $BODY$ LANGUAGE 'plpgsql' </code></pre> <p>What am I doing wrong? Thanks in advance!</p> <p><strong>Edit</strong>: The indentions didn't came through as expected. Here are pastebin links: <a href="http://pastebin.com/w18WaCW0" rel="nofollow">http://pastebin.com/w18WaCW0</a> <a href="http://pastebin.com/W8ewXxEe" rel="nofollow">http://pastebin.com/W8ewXxEe</a></p>
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