Estimated Row Count Query. How to avoid?

Question

Hi,
I use Jdeveloper 9.0.3. Production to evaluate its capability with swing JClient. I found that before the form is shown on the desktop the framework runs the quety like this.
SELECT /*+ ORDERED USE_NL(RtEmployee) USE_NL(RtUnitmeasure) USE_NL(RtGroupcode) */ count(1) FROM (SELECT RtProduct.PRODUCTID, RtProduct.ID_UM, RtUnitmeasure.SHORTNAMERUS, RtProduct.ID_COMMON, RtProduct.NAMERUS, RtProduct.NAMEENG, RtProduct.ID_GROUPCODE, RtGroupcode.GROUPCODE, RtProduct.IS_GRCODEFAULT, RtProduct.VAT, RtProduct.PRICE_U, RtProduct.MINPRICE, RtProduct.MARKUP, RtProduct.IS_DISCOUNT, RtProduct.NOTE, RtEmployee.SURNAME, RtProduct.CREATEDATE, RtProduct.MODIFYDATE, RtProduct.ID_OPERATOR, RtProduct.ID, RtUnitmeasure.ID AS ID1, RtGroupcode.ID AS ID2, RtEmployee.ID AS ID3 FROM RT_PRODUCT RtProduct, RT_EMPLOYEE RtEmployee, RT_UNITMEASURE RtUnitmeasure, RT_GROUPCODE RtGroupcode WHERE ((RtProduct.ID_OPERATOR = RtEmployee.ID)AND (RtProduct.ID_UM = RtUnitmeasure.ID))AND (RtProduct.ID_GROUPCODE = RtGroupcode.ID))
to estimate dataset cardinality.
Attention development team. Plase pay attention that the statement is badly formed as
Hints entered into "Query Hint" field of the VO is placed in outer query but intended to use in sub query and will not be taken into account by optimizer!
My question is how to avoid this query and/or how can I replace a functionality for estimating dataset cardinality by user defined function or so?
Best regards,
Vyacheslav

Answer 1

I tried the suggested solution but could not figure
out how to get the current query string to extract
the WHERE clause to use in my own query or to get the
parameters to build my own WHERE. How about a more
explicit code example?
Joe:
A few different ways to do this. First, note that getQueryHitCount()
method receives the following parameter:
ViewRowSetImpl viewRowSet
To get the entire query statement, you can call
String entireQuery = vo.getQuery();
For each row set (identified by the viewRowSet parameter), you have a
set of where-clause parameters. Some of these are user provided
(through setWhereClauseParam calls) and some of these are system
provided (system provided params are primarily for view links).
To get all where-clause params (both user and system params), you
call:
Object[] paramVals = viewRowSet.getParametersAsStorageTypes();
Again, paramVals include both user and system param vals.
If you do
int noUserParams = viewRowSet.getWhereClauseParams().length;
noUserParams will tell how many of these are user supplied:
paramVals[0] .. paramVals[noUserParams-1] are user supplied and the
rest are system supplied.
If you want to get the Long postings are being truncated to ~1 kB at this time.