[DogeMan]

Код:

mysql_format(con, query, sizeof(query), "SELECT * FROM `tb_players` WHERE `cl_nick` = '%e'", PlayerName(playerid));
mysql_tquery(con, query, "SearchPlayer", "i", playerid);

public SearchPlayer(playerid)
{
     if(cache_num_rows() > 0) ShowPlayerDialog(LOGIN);
     else ShowPlayerDialog(REGISTRO);
     return 1;
}

Cуdigo auto-explicativo.