package squirrel
RowScanner is the interface that wraps the Scan method. Scan behaves like database/sql.Row.Scan.
type RowScanner interface {
	Scan(...interface{}) error
}
Row wraps database/sql.Row to let squirrel return new errors on Scan.
type Row struct {
	RowScanner
	err error
}
Scan returns Row.err or calls RowScanner.Scan.
func ( *Row) ( ...interface{}) error {
	if .err != nil {
		return .err
	}
	return .RowScanner.Scan(...)