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Selection callback definition function, makes it possible to define a callback function that will be called for each line returned by the SqlRequest function

SqlDB SqlFetch ( SqlDB _db_ fun [SqlDB u0 [S r1]] I _callback_ u0 _user_ )

_db_
	any SqlDB
_callback_
	if the return code for this callback is set to 0, the SqlRequest will recall it, providing it with the next line if the return code for this callback is not 0, processing of the SqlRequest function will be stopped in all cases, if a callback function is defined by SqlFetch, the SqlRequest function will return null lastly, the callback remains valid during the execution of the next SqlRequest. It is thus automatically deactivated when SqlRequest is returned
_user_
	user parameter