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unit udr_myrowcount;
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{$IFDEF MSWINDOWS}
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{$DEFINE WINDOWS}
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{$ENDIF}
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{$IFDEF FPC}
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{$mode delphi}
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{$codepage UTF8}
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{$interfaces COM}
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{$ENDIF}
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interface
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uses
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Classes, SysUtils, IB, FBUDRController, FBUDRIntf;
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{ The DDL for this external function is
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create or alter function MyRowCount (
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table_name varchar(31)
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) returns integer
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external name 'fbudrtests!row_count'
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engine udr;
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}
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type
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TMyRowCountFunction = class(TFBUDRFunction)
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public
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function Execute(context: IFBUDRExternalContext;
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ProcMetadata: IFBUDRProcMetadata;
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InputParams: IFBUDRInputParams;
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ResultSQLType: cardinal): variant; override;
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end;
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implementation
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function TMyRowCountFunction.Execute(context: IFBUDRExternalContext;
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ProcMetadata: IFBUDRProcMetadata; InputParams: IFBUDRInputParams;
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ResultSQLType: cardinal): variant;
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begin
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with context do
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begin
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Result := GetAttachment.OpenCursorAtStart(GetTransaction,
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'Select count(*) from ' + InputParams.ByName('table_name').AsString)[0].AsInteger;
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end;
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end;
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Initialization
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FBRegisterUDRFunction('row_count',TmyRowCountFunction);
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end.
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