[X337]

You have to enclose a string with single or double quote in sql query.

Код:

WHERE `Name` = '%e'

And also, you can just execute update query without need to check if player name is exists in database. You can use cache_affected_rows() in the "OffBan" callback to check if player is already banned or doesn't exists.
Here's an example:

Код:

// In your oban cmd
mysql_format(g_Sql, query, sizeof(query), "UPDATE `accounts` SET `isBanned` = 1 WHERE `Name` =  '%e'", PlayerName); 
mysql_tquery(g_Sql, query, "OffBan", "is", playerid, PlayerName); 

public OffBan(playerid, Banned[]) 
{ 
	if(cache_affected_rows()) // It returns total of affected rows
	{
		new fmt[128];
		format(fmt, 128, "[BS] {AFAFAF}You have offline banned %s", Banned);
		SendClientMessage(playerid, COLOR_DARKCORAL, "[BS] {AFAFAF}Offline ban executed!");
		return 1;
	} 
	else
	{ 
		SendClientMessage(playerid, COLOR_DARKCORAL, "[BS] {AFAFAF}That player doesn't exist or already banned!"); 
		return 1; 
	} 
	return 1; 
}