Executing Prepared Statements with FireDAC Classes

By default, TFDQuery prepares the query to avoid recompiling the same query over and over.

FDQuery1.SQL.Text := 'SELECT * FROM INVOICES WHERE CustomerName=:CustomerName' 
FDQuery1.ParamByName('CustomerName').AsString := 'NewTech Industries';
FDQuery1.Open;

Notes

• If you need to execute a command only once, set ResourceOptions.DirectExecute to true.
• The connection must be active and open while a statement is prepared.