C＃-更新需要猜测AUTO_INCREMENT的ID

Question

Ok, so in my MySQL Database, I have a table called groups. In that table, there is one column called id and one column called group_id. Both are needed. Groups are inserted via a C# Emulator. I need to know, how can I edit my code to make it match id and group_id in the database? id is an AUTO_INCREMENT in my groups table and is the primary key.

Here is my C# code,

queryreactor.setQuery(string.Concat(new object[]
                {
                    "INSERT INTO groups (`name`, `desc`,`badge`,`owner_id`,`created`,`room_id`,`colour1`,`colour2`) VALUES(@name, @desc, @badge, ",
                    Session.GetHabbo().Id,
                    ", UNIX_TIMESTAMP(), ",
                    RoomId,
                    ",'",
                    Colour1,
                    "','",
                    Colour2,
                    "')"
                }));
                queryreactor.addParameter("name", Name);
                queryreactor.addParameter("desc", Desc);
                queryreactor.addParameter("badge", Badge);

Anyone any ideas? I know MySQL doesn't support 2 AUTO_INCREMENT columns. But, I basically just need to match the id column and group_id column.

Answer 1

I don't get it why you need two columns just to have exactly same values, because you can always use ID column for both group_Id and ID.

If you still want to have such columns, then a simple solution would be to fire an update query after your Insert query where your group_id gets updated with your newly inserted id column.

something like

update groups
set group_id = id
where group_id is null

or even better, write a trigger on your groups table so that your group_id column gets updated automatically with that of id column on an insert statement of the row