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07.15.2008 at 01:59PM PDT, ID: 23567644
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6.6

Access Violation vs. Invalid filter expression

Asked by mikesExpertExchange in Delphi Programming, Delphi Components, Delphi Database

Tags: ,

i'm using D7 and connecting to an oracle database via an ADO connection component. using TClientDataSet and TDataSetProvider components. i first qry for data using an ADO query component that i create on the fly (in code). once the query finishes i use the following lines of code to populate / prepare the TClientDataSet and TDataSetProvider components to open:

    OnTheFlyQuery.Open;
    ClientDataSet1.FieldDefs.Clear;
    DataSetProvider1.DataSet := OnTheFlyQuery;
    ClientDataSet1.ProviderName := 'DataSetProviderMDN1';
    DataSetProvider1.GetRecords(-1, RecCount, ResetOption);
    ClientDataSet1.Open;

I use the TClientDataSet and TDataSetProvider components because the results returned from the OnTheFlyQuery will more than likely be more than one record and I may need to loop throught these records later on whill other queries are running so i wanted to keep the records local.

My problem is that the OnTheFlyQuery can sometimes take 10 - 15 mins and right now fixing that problem is out of my hands. When it does take that long I get an Access violation on the ClientDataSet1.Open line, if it does finish in a reasonable time then i'm still getting a: "EDatabaseError with message "Invalid filter expression character: ¬" error message. If I change the CommandTimeout of the OnTheFlyQuery or the TADOConnection components to be 6300 secs (15 min) then I still get the EDatabasError but no access violation error. Any ideas / suggestions?Start Free Trial
 
Keywords: Access Violation vs. Invalid filter expr…
Title
1 TADOConnection
2 d7 ado fix?
3 How do I use ADO to connect to a table?
4 TADOConnection timeout > 30 sec. …
5 Access Violation Error using GetTable…
6 Using TADOConnection in DLLs
 
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[+][-]07.15.2008 at 02:01PM PDT, ID: 22011104

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Zones: Delphi Programming, Delphi Components, Delphi Database
Tags: Delphi, Delphi
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Solution Provided By: Delphian
Participating Experts: 2
Solution Grade: A
 
 
[+][-]07.16.2008 at 09:48AM PDT, ID: 22017731

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