Kbase P115120: Crash referencing THIS- or TARGET-PROCEDURE within a dynamic QUERY-PREPARE( ) predicate.
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
15/10/2008 |
|
Status: Unverified
SYMPTOM(s):
Client crashes invoking the QUERY-PREPARE() method of a QUERY object.
The predicate expression given to QUERY-PREPARE() contains a reference to THIS-PROCEDURE or TARGET-PROCEDURE.
Stack trace contains references to the following:
rnqsmprep
rnqsmsem
rnDynQryPrepare
umDynqGetAttr
CAUSE:
This is a known issue being investigated by Development.
When the QUERY-PREPARE() is executed, the query compiler does not have the correct information to interpret THIS-PROCEDURE nor TARGET-PROCEDURE. The crash is caused by the QUERY-PREPARE() method trying to deference a NULL pointer.
FIX:
The following example gives a pattern to follow in order to amend your code.
Suppose the crash occurs with the following statement:
hQuery:QUERY-PREPARE("FOR EACH customer WHERE customer.custNum = DYNAMIC-FUNCTION('getCustNum' IN TARGET-PROCEDURE)").
You can change the predicate expression to:
hQuery:QUERY-PREPARE("FOR EACH customer WHERE customer.custNum = DYNAMIC-FUNCTION('getCustNum' IN WIDGET-HANDLE(' " + STRING(TARGET-PROCEDURE) + " '))").
By doing so, TARGET-PROCEDURE is resolved to a handle *before* the QUERY-PREPARE() method is invoked.
The same workaround can be applied to THIS-PROCEDURE.