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    <p>The best way to use this is with DBMS_SQL.</p> <p>You create a string that represents your SQL statement. You still use bind variables. It's painful.</p> <p>It goes something like this (I haven't compiled this, but it should be close) :-</p> <pre><code>CREATE OR REPLACE FUNCTION find_country( v_name t1.country%TYPE, v_type t2.type%TYPE) /* Hmm, column called type? */ DECLARE v_SQL varchar2(2000); v_select INTEGER; /* "Pointer" to a DBMS_SQL select statement */ v_execute INTEGER; BEGIN v_SQL := 'select column from table1 t1, table2 t2 || 'where t1.id = t2.id'; IF v_name IS NOT NULL THEN v_SQL := v_SQL || ' AND t1.country = :v_name' END IF; IF v_type IS NOT NULL THEN v_SQL := v_SQL || ' AND t2.type = :v_type'; END IF; /* Setup Cursor */ v_select := dbms_sql.open_cursor; dbms_sql.parse( v_select, v_SQL, DBMS_SQL.native); IF v_name IS NOT NULL THEN dbms_sql.bind_variable( v_select, ':v_name', v_name ); END IF; IF v_type IS NOT NULL THEN dbms_sql.bind_variable( v_select, ':v_type', v_type ); END IF; DBMS_SQL.DEFINE_COLUMN(v_select, 1, v_column); /* This is what we have selected */ /* Return value from EXECUTE is undefined for a SELECT */ v_execute := DBMS_SQL.EXECUTE( v_select ); IF DBMS_SQL.FETCH_ROWS( v_select ) &gt; 0 THEN /* A row was found DBMS_SQL.COLUMN_VALUE( v_select, 1, v_column); /* Tidy Up */ DBMS_SQL.CLOSE_CURSOR(v_select); RETURN v_ID_address; ELSE DBMS_SQL.CLOSE_CURSOR(v_select); /* No row */ RETURN NULL; END IF; EXCEPTION WHEN OTHERS THEN IF DBMS_SQL.IS_open(v_select) THEN DBMS_SQL.CLOSE_CURSOR(v_select); END IF; RAISE; END; </code></pre> <p>This approach is so painful compared to just writing the SQL inline that unless you have heaps of columns sometimes it's just easier writing a couple of different versions using this syntax:</p> <pre><code>FOR r IN (SELECT blah FROM blah WHERE t1 = v_t1) LOOP func( r.blah ); END LOOP; </code></pre>
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    1. COa column called type? ... don't ask! :( Thanks a lot for this, it looks like the way i have to do it.
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