[ecca]

This will just add some temporary flags i think, so try this one out instead.

PHP Code:

#pragma semicolon 1
#include <sourcemod>

new Handle:db = INVALID_HANDLE;

public Plugin:myinfo =
{
    name = "VIP",
    author = "ecca",
    description = "",
    version = "1.0",
    url = ""
};

public OnPluginStart()
{
    SQL_TConnect(SQL_OnConnect, "VipPlugin");
}

public SQL_OnConnect(Handle:owner, Handle:hndl, const String:error[], any:data)
{
    if (hndl == INVALID_HANDLE)
    {
        LogError("Error connecting to the database: %s", error);
    }
    else
    {
        db = hndl;
        PrintToServer("Connection successful");
    }
}

public OnClientPostAdminCheck(client)
{
    if (IsClientInGame(client) && !IsFakeClient(client))
    {
        new String:steamid[20];
        GetClientAuthString(client, steamid, sizeof(steamid));
        
        new String:query[1024];
        FormatEx(query, sizeof(query),  "SELECT * FROM viplist WHERE steamid='%s'", steamid);
        
        SQL_TQuery(db, CheckVIP, query, client);
    }
}

public CheckVIP(Handle:owner, Handle:hndl, const String:error[], any:client)
{
    if (hndl == INVALID_HANDLE)
    {
        LogError("error: %s", error);
    }

    if    (SQL_FetchRow(hndl))
    {
        new clientFlags = 0;
        clientFlags = GetUserFlagBits(client);
        clientFlags |= ADMFLAG_RESERVATION|ADMFLAG_CUSTOM6;
        SetUserFlagBits(client, clientFlags);
    }
}