Cartesian Query

Question

Hi,
I'm using Toplink 11g with Weblogic 10.3.0.
The application is generating query having cartesian product on one single table; here goes an example;
SELECT t0.ID_REQUEST,
t0.RD_NUM_RETRY,
t0.RD_START_TIME,
t0.EVENT_ID,
t0.RD_END_TIME,
t0.MSISDN,
t0.RD_STATUS,
t0.RET_MESSAGE,
t0.REQUEST,
t0.RD_BILL_DATE,
t0.SERVICE_CLASS,
t0.CSP,
t0.SERVICE_ID,
t0.RET_CODE,
t0.SERVICE_KEY,
t0.RD_ID,
t0.SERVICE_NAME,
t0.RD_CESS,
t0.TOTAL_AMOUNT,
t0.BILLED_PARTIAL
FROM BILLING_NOT_SUCCESS t0, BILLING_NOT_SUCCESS t1
WHERE ( ( ( ( (t0.RD_STATUS = 'PARKED') AND (t0.RD_END_TIME > SYSDATE))
AND (t0.RD_CESS = 0))
AND (t1.MSISDN = xxxxxxxxx))
Is there any particular reason for this or it's simply an error?
I'm afraid of the owerhead generated by this cartesian product: How can I (should I?) avoid Toplink to generate query of this kind?
Thank you veri much indeed.
AND (t1.RET_CODE IN ('006', '201', '058')));
L.D.

Answer 1

Hi,
thank you very much for answering.
I'm using toplink, included adding toplink.jar in classpath of my Weblogic project.
Weblogic version is 10.3.0. (no JPA2.0). It's used to implement data access metods beeing used by SINGLETON Clustered application.
Sessions are configured as SERVERSessions distributed by a broker.
Sessions are configured in sessions.xml.
Thi is the most external methos building the query:
public List<BillingNotSuccess> getFNDRecords(String msisdn) throws Exception {
     List<BillingNotSuccess> billRes = null;
     Expression exp = null, exp1 = null;
     exp = getConditions().and(exprBuild.get("msisdn").equal(msisdn));
     String retCodeCondition = null;
     String valueR = configurator.getParameterValue(Parameters.PARAM_RETRY_CODES_RELOAD);
     logger.debug("mcss.retry.codes.reload: "+valueR);
     if (valueR != null && !valueR.equalsIgnoreCase("")){
          retCodeCondition = valueR;
     String valueP = configurator.getParameterValue(Parameters.PARAM_RETRY_CODES_PARTIAL);
     logger.debug("mcss.retry.codes.partial: "+valueP);
     if (valueP != null && !valueP.equalsIgnoreCase("")){
          retCodeCondition = (retCodeCondition!=null)?retCodeCondition+","+valueP:valueP;
     if (retCodeCondition != null){
          exp1 = exprBuild.get("retCode").in(retCodeCondition.split(","));
     billRes =  readWithConditionOrdering(BillingNotSuccess.class, "rdStartTime", exp.and(exp1));
     traceResult(billRes);
     return billRes;
This is the method used to build AND conditions shared by other business methods:
private Expression getConditions() throws Exception {
     Expression exp = null, exp1 = null, exp2 = null;
     exprBuild = new ExpressionBuilder(BillingNotSuccess.class);
     exp = exprBuild.get("rdStatus").equal("PARKED");
     exp1 = exprBuild.get("rdEndTime").greaterThan(new Date());
     exp2 = exprBuild.get("rdCess").equal(0);
     return exp.and(exp1).and(exp2);
Thank you very much again and please let me know if I can help with any further details.
Best regards.
L.D.