public string GetCommand(uint entry, int itemId, int maxCount, int extendedCost)
{
var builder = new CommandBuilder("npc_vendor");
builder.AddColumnValue("entry", entry);
builder.AddColumnValue("item", itemId);
builder.AddColumnValue("maxcount", maxCount);
builder.AddColumnValue("incrtime", 0);
builder.AddColumnValue("ExtendedCost", extendedCost);
return builder.BuildInsert(true);
}