[Divergent]

You should use escape strings instead of regular strings to prevent MYSQL injections (%e).

Код:

format(string, sizeof(string), "SELECT * FROM vehicles WHERE Owner = '%s'", Name(playerid));

In this code you're selecting all data. If you just want the vehicle model ID then you only need to select that row.

Код:

format(string, sizeof(string), "SELECT `vehiclemodel` FROM `vehicles` WHERE `Owner` = '%e'", Name(playerid));

But ideally all of this data should be loaded once a player logs in, and since this player is online you could just use the variables from the script rather than a MYSQL query.