no obtiene datos el sqlquery en una funcion

[Miguel Salas]

STATIC FUNCTION CalculaSaldo(oDataField)


local nSaldo := 0
local oSqlQuerysaldo := TSQLQuery():New()
WITH OBJECT oSqlQuerysaldo
:oDataSource:= appdata:oMariadbds1

:cSelect := [SELECT * from factura]

:lOpen := .t.
MsgBox(Len(oSqlQuerysaldo:aFields) ) // manda un 0
END WITH

nSaldo := oSqlQuerysaldo:saldo


return nSaldo


En cambio este si carga las tuplas
METHOD Button1Click( oSender ) CLASS TForm4
local nSaldo := 0

//MsgBox(oDataField:oDataset:clave)


WITH OBJECT ::oSqlQuery2
:oDataSource:= appdata:oMariadbds1


:cSelect := [SELECT * from factura]

:lOpen := .t.

END WITH

::oDBBrowse3:oDataSet := ::oSQLQuery2
::oDBBrowse3:Refresh()

RETURN Nil

[Miguel Salas]

resuelto dbe crearse con tsqlquery:create() no con new()