Building Query in Pre-Query. How to make it more Memory Efficient

Question

Hello all,
I have a form with 2 Data Blocks.
First Block is used for giving query Parameters and second one returns the results based on a View.
I build the Select Clause in the pre-query based on the Parameters. So every time I have a Different Query.
Could that create problem in the Database Server due to parsing queries again and again?
Would using a Different approach (i.e. ref Cursors) be more memory Efficient?
Thanks

Answer 1

The pre-query is quite Large so I am pasting only a part of the Code (the rest of it Is Identical).
In the selects v is the alias of the View of the Second Data Block.
The :qf_ bind variables are fields of the First block where I give the Parameters.
               IF :QF_IS_DISPLAYED=1 THEN
               L_WHERE := L_WHERE || ' AND V.IS_DISPLAYED =''1''';
               END IF;
               IF :qf_colour IS NOT NULL THEN
               L_WHERE := L_WHERE || ' AND item_colour=''' ||:qf_colour ||'''';
               END IF;
     IF :qf_product_item_colour IS NOT NULL THEN
               L_WHERE := L_WHERE || ' AND product_item_colour=''' ||:qf_product_item_colour ||'''';
     END IF;
     IF :qf_product_length IS NOT NULL THEN
               L_WHERE := L_WHERE || ' AND product_length=''' ||:qf_product_length ||'''';
     END IF;
               IF :qf_apf_batch_id IS NOT NULL THEN
               L_WHERE := L_WHERE || ' AND apf_batch_id=' ||:qf_apf_batch_id;
               END IF;
                    if :qf_prod_resource is not null then
                    L_WHERE := L_WHERE ||' AND v.resources = ''' ||:qf_prod_resource ||'''';
                    end if;
                    if :qf_customer_number is not null then
                    L_WHERE := L_WHERE || ' AND FACTORY_ORDER_ID IN (SELECT FA.FACTORY_ORDER_ID
                                                                                                                                                 FROM OE_ORDER_HEADERS_ALL OH,
                                                                                                                                                                RA_CUSTOMERS RA,
                                                                                                                                                                XXSC_DEMAND_LINES DL,
                                                                                                                                                                XXSC_FACTORY_ORDERS FA
                                                                                                                                                 WHERE      OH.SOLD_TO_ORG_ID = RA.CUSTOMER_ID
                                                                                                                                                 AND      DL.SOURCE_HEADER_ID = OH.HEADER_ID
                                                                                                                                                 AND          DL.FACTORY_ORDER_ID = FA.FACTORY_ORDER_ID
                                                                                                                                                 AND               RA.CUSTOMER_NUMBER = ''' ||:qf_customer_number ||''')';
                    end if;