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 Country, Education FROM [adventureworks].[Model].Customer WHERE Country=:Country' 
FDQuery1.ParamByName('Country').AsString := 'Australia';
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.