MoveUP procedure for tree - SQL Server Forums

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MoveUP procedure for tree

Author

Topic

CoTuDo
Starting Member

3 Posts

Posted - 2006-05-11 : 10:32:14

My tree is built with table :
tree(treeNodeId,parentNodeId,sortOrder)
the third column: sortOrder it's for sort the tree, to have the possibility to move up and down...but i still can't realize it...please help me...:)

Kristen
Test

22859 Posts

Posted - 2006-05-11 : 11:03:51

If you want to move the current node to, say, position 7 then anything currently with Position >= 7 needs to have 1 added. Probably something like:


BEGIN TRANSACTION
UPDATE MyTable
SET    Position = Position + 1
WHERE  Position >= 7
IF @@ERROR <> 0 GOTO ErrorRollback

UPDATE MyTable
SET    Position = 7
WHERE  MyPK = ... some ID value for the record being moved ...
IF @@ERROR <> 0 GOTO ErrorRollback
COMMIT
RETURN 0

ErrorRollback:
ROLLBACK
RETURN 1

Kristen

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