QSqlQuery causes an implicit conversion

I inherited some NetBeans C++ code and QSqlQuery causes an implicit conversion in queries when passing a string.

                q.addBindValue(labelObject->text());

(@P1 int,@P2 int,@P3 nvarchar(14),*@P4 int,@P5 int,@P6 nvarchar(14*),@P7 int,@P8 int)

IF EXISTS (SELECT NULL FROM VAL_LABEL WHERE ROUT_ID=@P1 AND LABEL_ID=@P2)

  UPDATE VAL_LABEL

    SET LABEL_VAL=@P3

    WHERE ROUT_ID=@P4 AND LABEL_ID=@P5

  ELSE

    INSERT INTO VAL_LABEL (LABEL_VAL,ROUT_ID,LABEL_ID)

       VALUES (@P6,@P7,@P8)

labelObject is a QLabelEdit and the text() property is a QString.  When the objects gets bound in SQL Server it becomes a NVARCHAR and in a text field that is VARCHAR then this causes an implicit conversion which slows down my server.

Realize that I didn't write this code but in trying to tune this code up I am finding all sorts of issues but performance issues shouldn't be caused by QT.