How to recover data from a query made with object "ADODB.Command"? - sql-server

Question

Based on the code below where I can retrieve the result of a query using dynamic object "ADODB.Command"?
This unit will always work with stored procedure, and the types of parameters that will be used are the input and output type.
use Delphi 7 + SQL Server Express 2012.
unit uadolibrary;
interface
uses
ComObj, Variants;
function ADOStart(strConexao: AnsiString): Boolean;
function ADOStop: Boolean;
function ADOConfigParams(ParamName: string; ParamType, ParamIO,
ParamSize: integer; Val: variant; CanClear: Boolean = False): Boolean;
function ADOSetParamVal(ParamName: string; val: variant): Boolean;
function ADOGetParamVal(ParamName: string): Variant;
function ADOGetValue(_Indece: integer): Variant;
function ADOExecute(procname: string): Boolean;
const
{Param Data Types}
adInteger = 3;
adSingle = 4;
adDate = 7;
adBoolean = 11;
adVarBites = 16;
adUnsignedTinyInt = 17;
adDateTime = 135;
advarChar = 200;
{Param Directions}
adParamInput = 1;
adParamOutput = 2;
adParamReturnValue = 4;
{Command Types}
adCmdText = 1;
adCmdTable = 2;
adCmdStoredProc = 4;
adCmdTableDirect = 512;
adCmdFile = 256;
implementation
var
ADODBConnection,
ADORecordSet,
ADOCommand: Variant;
function ADOStart(strConexao: AnsiString): Boolean;
begin
try
ADODBConnection:= CreateOleObject('ADODB.Connection');
ADODBConnection.ConnectionString:= strConexao;
ADODBConnection.Open;
ADORecordSet:= CreateOLEObject('ADODB.Recordset');
ADOCommand:= CreateOLEObject('ADODB.Command');
ADOCommand.ActiveConnection:= ADODBConnection;
ADOCommand.CommandText:= 'Procedure';
ADOCommand.CommandType:= adCmdStoredProc;
Result:= True;
except
begin
if not (VarIsEmpty(ADODBConnection)) then
begin
ADODBConnection.Close;
ADODBConnection:= Unassigned;
end;
if not (VarIsEmpty(ADOCommand)) then
ADOCommand:= Unassigned;
if not (VarIsEmpty(ADORecordSet)) then
ADORecordSet:= Unassigned;
Result:= False;
end;
end;
end;
function ADOStop: Boolean;
begin
try
if not (VarIsEmpty(ADODBConnection)) then
ADODBConnection.Close;
ADODBConnection:= Unassigned;
ADORecordSet:= Unassigned;
ADOCommand:= Unassigned;
Result:= True;
except
Result:= False;
end;
end;
function ADOConfigParams(ParamName: string; ParamType, ParamIO,
ParamSize: integer; Val: variant; CanClear: Boolean): Boolean;
var
_W: integer;
DerivedParamSize: integer;
begin
try
case ParamType of
adInteger: DerivedParamSize:= 4;
adSingle : DerivedParamSize:= 4;
adDate : DerivedParamSize:= 8;
adBoolean: DerivedParamSize:= 1;
adVarBites: DerivedParamSize:= 1;
adUnsignedTinyInt: DerivedParamSize:= 1;
adDateTime: DerivedParamSize:= 8;
advarChar: DerivedParamSize:= ParamSize;
end;
if CanClear then
for _W:= 0 to (ADOCommand.parameters.count) - 1 do
ADOCommand.parameters.delete(0);
ADOCommand.parameters.append(
ADOCommand.createparameter(ParamName, ParamType, ParamIO,
DerivedParamSize, Val));
Result:= True;
except
Result:= False;
end;
end;
function ADOSetParamVal(ParamName: string; val: variant): Boolean;
begin
try
ADOCommand.Parameters[ParamName].Value := val;
Result:= True;
except
Result:= False;
end;
end;
function ADOGetParamVal(ParamName: string): Variant;
begin
try
Result:= ADOCommand.Parameters[ParamName].Value;
except
Result:= varEmpty;
end;
end;
function ADOExecute(procname: string): Boolean;
begin
try
ADOCommand.CommandText:= procname;
ADOCommand.CommandType:= adCmdStoredProc;
ADORecordSet:= ADOCommand.Execute;
Result:= True;
except
Result:= False;
end;
end;
function ADOGetValue(_Indece: integer): Variant;
begin
Result:= ADORecordSet.Fields.Item[_Indece].Value; {<- I thought it was here}
end;
end.

Answer 1

Managed to solve the problem this in my stored procedure. This function can retrieve the data returned.
function ADOGetParamVal (ParamName: string): Variant;
begin
try
Result:= ADOCommand.Parameters [ParamName] .Value;
except
Result:= varEmpty;
end;
end;