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Driver can not set up the TDBXCommon.Parameters
Posted: Mon 23 Sep 2019 01:58
by Eden0928
DBXCommon.TDBXCommand.Prepare
Prepare the command for execution
This method prepares the command for execution.
If no parameters have been set up, the driver supports parameter metadata and the dynamic SQL statement contains parameters, Prepare sets up the command's parameters.
My test code:
Code: Select all
procedure TForm2.Button1Click(Sender: TObject);
var
LCommand: TDBXCommand;
begin
LCommand := SQLConnection1.DBXConnection.CreateCommand;
LCommand.Text := 'SELECT * FROM employee WHERE empno = ?';
LCommand.Prepare;
Memo1.Lines.Add(IntToStr(LCommand.Parameters.Count));
end;
The result always to get 0.
How to set the sqlcoonection.param what support auto create TDBXCommand.Parameters?
Re: Driver can not set up the TDBXCommon.Parameters
Posted: Wed 25 Sep 2019 14:50
by Stellar
Thank you for providing the information. We've reproduced the issue and started to investigate possible causes of the described behavior. We will let you know the results as soon as we get them.
Re: Driver can not set up the TDBXCommon.Parameters
Posted: Tue 22 Oct 2019 03:37
by Eden0928
Hi
Do we have a date for the fix to be available?
Thanks
Re: Driver can not set up the TDBXCommon.Parameters
Posted: Wed 23 Oct 2019 13:53
by Stellar
We have fixed the issue with auto creation of parameters, and the fix will be included in the next build of dbExpress driver for SQL Server.
Re: Driver can not set up the TDBXCommon.Parameters
Posted: Tue 05 Nov 2019 02:28
by Eden0928
Could you fixed the problem to all dbExpress driver product?
Re: Driver can not set up the TDBXCommon.Parameters
Posted: Fri 08 Nov 2019 13:42
by Stellar
At the moment, we cannot give you an exact date for when the next build of dbExpress driver for SQL Server will be released.
We can provide you with a nightly build of dbExpress driver for SQL Server that includes the fix of the issue with auto creation of parameters.
To get the build, please send us a request via the e-support form. (devart.com the "Support"\"Request Support" menu).
Re: Driver can not set up the TDBXCommon.Parameters
Posted: Mon 17 Feb 2020 07:43
by Eden0928
Hi
I try the 8.1.3 trial.
But TDBXCommand.IsPrepared is always false, and TDBXCommand.Parameters.count is zero.
Could you tell me how to set the connection properties?
Re: Driver can not set up the TDBXCommon.Parameters
Posted: Mon 24 Feb 2020 16:00
by Stellar
Please use the syntax :<name> to place a parameter marker in a SQL statement when using Devart dbExpress driver for SQL Server. For example:
Code: Select all
procedure TForm2.Button1Click(Sender: TObject);
var
LCommand: TDBXCommand;
begin
LCommand := SQLConnection1.DBXConnection.CreateCommand;
LCommand.Text := 'SELECT * FROM employee WHERE empno = :p1';
LCommand.Prepare;
Memo1.Lines.Add(IntToStr(LCommand.Parameters.Count));
end;
Re: Driver can not set up the TDBXCommon.Parameters
Posted: Tue 25 Feb 2020 07:05
by Eden0928
Stellar wrote: ↑Mon 24 Feb 2020 16:00
Please use the syntax :<name> to place a parameter marker in a SQL statement when using Devart dbExpress driver for SQL Server. For example:
Code: Select all
procedure TForm2.Button1Click(Sender: TObject);
var
LCommand: TDBXCommand;
begin
LCommand := SQLConnection1.DBXConnection.CreateCommand;
LCommand.Text := 'SELECT * FROM employee WHERE empno = :p1';
LCommand.Prepare;
Memo1.Lines.Add(IntToStr(LCommand.Parameters.Count));
end;
Good!
After use Prepare method, TDBXCommand.Parameters.Count > 0.
However, why TDBXCommand.IsPrepared always is False?
Re: Driver can not set up the TDBXCommon.Parameters
Posted: Tue 25 Feb 2020 07:32
by ramyasri123
Hi
Do we have a date for the fix to be available?
Thanks
Re: Driver can not set up the TDBXCommon.Parameters
Posted: Thu 27 Feb 2020 16:00
by Stellar
The fix was included in the latest version 8.1.3 of dbExpress driver, which is available for download on our website.
Re: Driver can not set up the TDBXCommon.Parameters
Posted: Tue 17 Nov 2020 14:19
Hi,
We've updated dbexpsda40.dll today from version 7.4.6 to 8.3.1.
Delphi Tokyo 10.2 update 3
Parameters in the query are not found (TSQLQuery.Params.Count stays 0) and if I call TSQLQuery.PrepareStatement I get an AV in dbexpress250.bpl.
Help...
Kind regards
Mies
Re: Driver can not set up the TDBXCommon.Parameters
Posted: Tue 17 Nov 2020 14:45
I'm sorry,
Problem solved. The SQLConnection wasn't properly initialized.
Re: Driver can not set up the TDBXCommon.Parameters
Posted: Fri 20 Nov 2020 09:18
by Stellar
Glad to see that the issue was resolved.
Feel free to contact us if you have any further questions about our products.