Using Firedac to run SQL stored procedure - sql

Question

I'm trying to figure out how to run a stored procedure using firedac
unit DataLayer.OilCommanderConnection;
interface
uses
FireDAC.Phys.FB,
Generics.Collections,
Model.Sample,
Model.Batch,
FireDAC.Stan.Intf, FireDAC.Stan.Option, FireDAC.Stan.Error,
FireDAC.UI.Intf, FireDAC.Phys.Intf, FireDAC.Stan.Def, FireDAC.Stan.Pool,
FireDAC.Stan.Async, FireDAC.Phys, FireDAC.Phys.MySQL, Data.DB,
FireDAC.Comp.Client, FireDAC.Phys.MSSQL,
FireDAC.DApt,
FireDAC.Comp.UI
;
type
TOilCommanderConnection = class
strict private
public
Connection : TFDConnection;
function GetSampleTypesForBatch(Batch : TBatch) : Boolean;
function Connect:Boolean;
constructor Create;
destructor Destroy; override;
end;
implementation
uses
SysUtils
;
function TOilCommanderConnection.Connect:Boolean;
var
OK : Boolean;
begin
OK := true;
Connection := TFDConnection.Create(nil);
try
Connection.Params.LoadFromFile('MSSQL.ini');
finally
Result := OK;
end;
end;
function TOilCommanderConnection.GetSampleTypesForBatch(Batch : TBatch) : Boolean;
var
StoredProc : TFDStoredProc;
begin
Connect;
StoredProc := TFDStoredProc.Create(nil);
try
StoredProc.Connection := Connection;
StoredProc.StoredProcName := 'GetSampleTypesForBatch';
StoredProc.Prepare;
StoredProc.FetchOptions.Items := StoredProc.FetchOptions.Items - [fiMeta];
with StoredProc.Params do
begin
Clear;
with Add do
begin
Name := 'BatchNo';
ParamType := ptInput;
DataType := ftString;
Size := 6;
end;
end;
StoredProc.StoredProcName := 'GetSampleTypesForBatch';
StoredProc.Prepare;
StoredProc.Params[0].Value := Batch.RackNo;
StoredProc.ExecProc;
while not StoredProc.Eof do
begin
//StoredProc.FieldByName('').AsS
StoredProc.Next;
end;
finally
FreeAndNil(StoredProc);
end;
Result := true;
end;
constructor TOilCommanderConnection.Create;
begin
inherited;
Connection := TFDConnection.Create(nil);
end;
destructor TOilCommanderConnection.Destroy;
begin
if Assigned(Connection) then FreeAndNil(Connection);
inherited;
end;
end.
I get an error message a the first occurrence of the line
StoredProc.Prepare;
Here is the message
--------------------------- Debugger Exception Notification
Project RefractiveIndexTests.exe raised exception class Exception with message 'Object factory for class
{3E9B315B-F456-4175-A864-B2573C4A2201} is missing. To register it, you
can drop component [TFDGUIxWaitCursor] into your project'.
I've called the function using
OilCommanderConnection.GetSampleTypesForBatch(batch);
from a test project.
the tutorial I read didn't explain what to do about this situation.
I've tried adding TFDGUIxWaitCursor into my project as the error message suggests but this has not made any difference. I wonder if this problem is related to me keeping the Database connection logic in a separate unit to my Main Form. I would like to be able to separate my user interface from my Data Layer.

Answer 1

Depending on the type of your application, include one of the following units into any one "uses" clause:
FireDAC.VCLUI.Wait - for VCL applications;
FireDAC.FMXUI.Wait - for FireMonkey applications;
FireDAC.ConsoleUI.Wait - for console / non-visual applications.