toSQL method
Generates the SQL fragment for this ORDER BY specification.
Returns a string like "field_name
ASC" or "field_name
DESC".
Example:
QOrder('name').toSQL(); // "`name` ASC"
QOrder('created_at', desc: true).toSQL(); // "`created_at` DESC"
Implementation
@override
String toSQL() {
return '${field.toSQL()} ${desc ? 'DESC' : 'ASC'}';
}