[Tomer!.$]

Try this:

pawn Код:

public OnPlayerConnect(playerid)
{
    new Query[80],string[128];
    format(Query,sizeof(Query),"SELECT * FROM `Users` WHERE `Username` = `%s` LIMIT 1;",GetName(playerid));
    mysql_query(Query);
    mysql_store_result();
    if(mysql_num_rows() > 0)
    {
        format(string,sizeof(string),"Hey, %s! \nYour account is registered.\nPlease enter the password to log in!",GetName(playerid));
        ShowPlayerDialog(playerid,0,DIALOG_STYLE_INPUT,"Login",string,"Login","Quit");
    }
    else
    {
        format(string,sizeof(string),"Hey, %s! \nYour account is not registered. \nPlease register to continue!",GetName(playerid));
        ShowPlayerDialog(playerid,1,DIALOG_STYLE_INPUT,"Register",string,"Register","Quit");
    }
    mysql_free_result();
    return 1;
}