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6.6

Delphi ADO  - calling stored procedures with params

Asked by henrikatwork in Delphi Programming, Delphi Database

Tags: delphi, ado, stored, procedure

Hi, why do I get an error using this code? "Operation not allowed in context (or something like that). Can anyone see the problem? I'm using a dynamic stored procedure, taking a SQL command as a parameter. The stored procedure at the end:

function ReaderADO.readADOSet(sSQLStatement: string): ADODB_TLB.Recordset;
var
  myConnection : ADODB_TLB.TConnection;
  rsResult : ADODB_TLB.Recordset;
  cmdCommand : ADODB_TLB.Command;
  oleParam, oleRecords : OleVariant;
begin
  myConnection := m_ConnectionPool.getADOConnection();
  oleRecords := Unassigned;
  rsResult := ADODB_TLB.CoRecordset.Create();
  cmdCommand := ADODB_TLB.CoCommand.Create( );
  cmdCommand.Set_ActiveConnection( myConnection.DefaultInterface );
  cmdCommand.CommandType := adCmdStoredProc;
  cmdCommand.CommandText := 'sp_DynamicRead';
  cmdCommand.Parameters.Item[0].Name := '@sql';
  cmdCommand.Parameters.Item[0].Value := 'SELECT * FROM xt_Car';
  cmdCommand.Parameters.Item[0].type_ := adVarChar;
   cmdCommand.Prepared := True;
  rsResult := cmdCommand.Execute(oleRecords, oleRecords , adLockOptimistic);
  result := rsResult;
  m_ConnectionPool.returnConnection();
end;

The Stored procedure looks like this:
CREATE PROCEDURE sp_Dynamicread (@sql VARCHAR(255)) AS
EXEC (@sql)
GO

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About this solution

Zones: Delphi Programming, Delphi Database
Tags: delphi, ado, stored, procedure
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Solution Provided By: bpana
Participating Experts: 4
Solution Grade: A
 
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