Hello I have a table called tournament which has TourID as the primary key . When testing scenarios I found out a bug on my page . When I delete using the following querie , then I insert a new tournament , I get the same TID, and I dont want this to happen I want to avoid any bugs caused by that, So How would I make the next tournametnt inserted be different ID thatn previous.,
On new Tour ID
Set RecSet = Server.CreateObject("ADODB
SqlQuery = "Select max(TourID) from tblTournament"
RecSet.Open SqlQuery,conSQL,1,1
If isnull(RecSet(0)) Then
MAX_TourID = 1
Else
MAX_TourID = 1 + RecSet(0)
End if
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Right click on the table and select modify..then select the colum you want to edit then look at colum properties...look for Identity Specification then click the plus sign and change (Is Identity) to yes and then crtl-s.
That will fix your problem. I walked you through the steps of using Microsoft SQL Server Management Studio.
its a bit confusing but when you go to (IS IDENTITY) you may have to scroll to the right and click on the box with the down arrow and choose either yes or no from the drop down menu...basically you can't type it. You have to choose yes or no from a drop down and depending on your monitor size and resolution it may be hidden so you have to scroll to the right.
If you use the identity and increment them by 1 or whatever you choose, after you delete a row, the new tournament should not get the same TID....and it doesn't become read only but I don't understand why any of your pages would ever want to update that field because the whole point of the identity is to have the numbers in that column be unique....which leads me to my next question, do you already have an identity specification in the table and you just want another column to auto increment as well?
identity columns always increment their values. If you started as a non-identity and want to change to identity, you have to do the following.
Assume a simple
create table mytable(mykey int , myvalue char(12))
insert into mytable select 1,'a'
insert into mytable select 2,'b'
insert into mytable select 3,'c'
Assume 150 rows in the table right now with max mykey=150
create table mynewtable (mykey int identity(1000,1), myvalue char(12))
set identity_insert mynewtable on
insert into mynewtable (mykey,myvalue) select mykey, myvalue from mytable
set identity_insert mynewtable off
now the next value for mykey will be 1001 and it will continue to increment thereafter.
insert into mynewtable(myvalue) values ('asdf')
select * from mynewtable
1 a
2 a
3 a
1001 asdf
Important Note! you cannot include the key in your insert statement - leave it out and it will automatically increment
You won't be able to change an existing column to identity, so, will have to add it afresh...
The problem will then become, you cannot maintain it directly, which does mean you will have to take out the calculation to generate a new number, and remove it from your insert statements, nor can it be the object of an update (meaning cannot do things like update tblTournament set TourID= some_new_number ).
Your alternative would be to add a new identity columns, and refer to that when trying to increment the current tourid (which would be a little out of the ordinary), or create a "delete_requested" flag and update that rather than a physical delete - then have a purge routine to physically remove older delete requested rows (so long as it is not the current max(tourid) ) and change your query to add in a where clause : and isnull(delete_requested,'N
The best solution is to rename that existing column (and index), add in a new column tourid as an identity, add back the primary key, change your pages accordingly. Only one other consideration and that would be any other dependant information using that ID. In which case, as a once off process, it is also possible to copy the table to a temp table, empty the real one and then set identity_insert tblTournament off and repopulate setting the new column with the old values, and then set identity_insert tblTournament on.
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by: faiga16Posted on 2008-12-17 at 10:14:27ID: 23196228
Set the column as identity. This is on Database level.