c# print barcode zebra Moving a Subtree in Visual C#

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Moving a Subtree
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Moving a subtree is a bit tricky. A change in someone s manager affects the row for that employee and for all of his or her subordinates. The inputs are the root of the subtree and the new parent (manager) of that root. The level and path values of all employees in the subtree are going to be affected. So you need to be able to isolate that subtree and also gure out how to revise the level and path values of all the subtree s members. To isolate the affected subtree, you join the row for the root (R) with the Employees table (E) based on E.path LIKE R.path + % . To calculate the revisions in level and path, you need access to the rows of both the old manager of the root (OM) and the new one (NM). The new level value for all nodes is their current level value plus the difference in levels between the new manager s level and the old manager s level. For example, if you move a subtree to a new location so that the difference in levels between the new manager and the old one is 2, you need to add 2 to the level value of all employees in the affected subtree. Similarly, to amend the path value of all nodes in the subtree, you need to remove the pre x containing the
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root s old manager s path and substitute it with the new manager s path. This can be achieved simply by using the STUFF function. Run the following code to create the MoveSubtree stored procedure, which implements the logic I just described:
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---------------------------------------------------------------------- Stored Procedure: MoveSubtree, -Moves a whole subtree of a given root to a new location -under a given manager --------------------------------------------------------------------USE tempdb; GO IF OBJECT_ID('dbo.MoveSubtree') IS NOT NULL DROP PROC dbo.MoveSubtree; GO CREATE PROC dbo.MoveSubtree @root INT, @mgrid INT AS SET NOCOUNT ON; BEGIN TRAN; -- Update level and path of all employees in the subtree (E) -- Set level = -current level + new manager's level - old manager's level -- Set path = -in current path remove old manager's path -and substitute with new manager's path UPDATE E SET lvl = E.lvl + NM.lvl - OM.lvl, path = STUFF(E.path, 1, LEN(OM.path), NM.path) FROM dbo.Employees AS E -- E = Employees (subtree) JOIN dbo.Employees AS R -- R = Root (one row) ON R.empid = @root AND E.path LIKE R.path + '%' JOIN dbo.Employees AS OM -- OM = Old Manager (one row) ON OM.empid = R.mgrid JOIN dbo.Employees AS NM -- NM = New Manager (one row) ON NM.empid = @mgrid; -- Update root's new manager UPDATE dbo.Employees SET mgrid = @mgrid WHERE empid = @root; COMMIT TRAN; GO
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The implementation of this stored procedure is simplistic and is provided for demonstration purposes. Good behavior is not guaranteed for invalid parameter choices. To make this procedure more robust, you should also check the inputs to make sure that attempts to make someone his or her own manager or to generate cycles are rejected. For example, this can be achieved by using an EXISTS predicate with a SELECT statement that rst generates a result set with the new paths and making sure that the employees IDs do not appear in their managers paths.
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To test the procedure, rst examine the tree before moving the subtree:
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SELECT empid, REPLICATE(' | ', lvl) + empname AS empname, lvl, path FROM dbo.Employees ORDER BY path;
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You get the following output:
empid empname ----------- ------------------1 David 2 | Eitan 4 | | Seraph 5 | | Jiru 10 | | | Sean 8 | | | Lilach 6 | | Steve 3 | Ina 7 | | Aaron 11 | | | Gabriel 9 | | | Rita 12 | | | | Emilia 13 | | | | Michael 14 | | | | Didi lvl ---0 1 2 2 3 3 2 1 2 3 3 4 4 4 path ------------.1. .1.2. .1.2.4. .1.2.5. .1.2.5.10. .1.2.5.8. .1.2.6. .1.3. .1.3.7. .1.3.7.11. .1.3.7.9. .1.3.7.9.12. .1.3.7.9.13. .1.3.7.9.14.
Then run the following code to move Aaron s subtree under Sean:
BEGIN TRAN; EXEC dbo.MoveSubtree @root = 7, @mgrid = 10; -- After moving subtree SELECT empid, REPLICATE(' | ', lvl) + empname AS empname, lvl, path FROM dbo.Employees ORDER BY path; ROLLBACK TRAN; -- rollback used in order not to apply the change
Note The change is rolled back for demonstration only, so the data is the same at the start of each test script. Examine the result tree to verify that the subtree moved correctly:
empid empname ----------- ------------------------1 David 2 | Eitan 4 | | Seraph 5 | | Jiru 10 | | | Sean 7 | | | | Aaron 11 | | | | | Gabriel lvl ---0 1 2 2 3 4 5 path -----------------.1. .1.2. .1.2.4. .1.2.5. .1.2.5.10. .1.2.5.10.7. .1.2.5.10.7.11.
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