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Help with update query

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Last Modified: 2012-08-21
Hello EE,

I have a TreeView in vb.net and when I take a node and drag it over another node..I want the order to be change. it works well in vb.net because I remove and insert the node correctly. but in the database it needs to change also becasue If I reload the Treeview i need to see the new order.


My table looks like this:

Code   Description  Sequence

ABC          Test              1
ABC1        Test1            2
ABC2        Test2            3
ABC3        Test3            4


Lets say I take the node ABC and Drag on the node ABC3
I need ABC in the table to be "after" ABC3 I would like to modify the Sequence that the result is:

ABC1          1
ABC2          2
ABC3          3
ABC            4

same thing reverse... lets say now we take ABC3 move to node ABC1, I need to update to that ABC3 be After ABC1  like this:

ABC1       1
ABC3       2
ABC2       3
ABC         4


how can I do a query update for that?  Im confused with the new Sequence, old sequence +1 .... -1... update the others to fit....


can you help?
thanks
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