U kunt het pakket DBMS_SQL gebruiken. Dit biedt een alternatieve manier om dynamische SQL uit te voeren. Het is misschien wat omslachtiger om te gebruiken, maar het kan flexibeler zijn, vooral met variërende aantallen bindparameters.
Hier is hoe je het zou kunnen gebruiken (waarschuwing:ik heb dit niet getest):
FUNCTION player_search (
pName IN VARCHAR2,
pHeight IN NUMBER,
pTeam IN VARCHAR2
) RETURN SYS_REFCURSOR
IS
cursor_name INTEGER;
ignore INTEGER;
id_var MyTable.ID%TYPE;
name_var MyTable.Name%TYPE;
height_var MyTable.Height%TYPE;
team_var MyTable.Team%TYPE;
BEGIN
-- Put together SQLQuery here...
-- Open the cursor and parse the query
cursor_name := DBMS_SQL.OPEN_CURSOR;
DBMS_SQL.PARSE(cursor_name, SQLQuery, DBMS_SQL.NATIVE);
-- Define the columns that the query returns.
-- (The last number for columns 2 and 4 is the size of the
-- VARCHAR2 columns. Feel free to change them.)
DBMS_SQL.DEFINE_COLUMN(cursor_name, 1, id_var);
DBMS_SQL.DEFINE_COLUMN(cursor_name, 2, name_var, 30);
DBMS_SQL.DEFINE_COLUMN(cursor_name, 3, height_var);
DBMS_SQL.DEFINE_COLUMN(cursor_name, 4, team_var, 30);
-- Add bind variables depending on whether they were added to
-- the query.
IF pName IS NOT NULL THEN
DBMS_SQL.BIND_VARIABLE(cursor_name, ':pName', pName);
END IF;
IF pHeight > 0 THEN
DBMS_SQL.BIND_VARIABLE(cursor_name, ':pHeight', pHeight);
END IF;
IF pTeam IS NOT NULL THEN
DBMS_SQL.BIND_VARIABLE(cursor_name, ':pTeam', pTeam);
END IF;
-- Run the query.
-- (The return value of DBMS_SQL.EXECUTE for SELECT queries is undefined,
-- so we must ignore it.)
ignore := DBMS_SQL.EXECUTE(cursor_name);
-- Convert the DBMS_SQL cursor into a PL/SQL REF CURSOR.
RETURN DBMS_SQL.TO_REFCURSOR(cursor_name);
EXCEPTION
WHEN OTHERS THEN
-- Ensure that the cursor is closed.
IF DBMS_SQL.IS_OPEN(cursor_name) THEN
DBMS_SQL.CLOSE_CURSOR(cursor_name);
END IF;
RAISE;
END;
(Opmerking:DBMS_SQL.TO_REFCURSOR
is nieuw in Oracle 11g.)