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Requests for ancestors of a given node are also commonfor example, returning the chain of management for a given employee. Not surprisingly, the algorithms for returning ancestors using iterative logic are similar to those for returning subordinates. Simply, instead of traversing the graph starting with a given node and proceeding "downwards" to child nodes, you start with a given node and proceed "upwards" to parent nodes. Run the code in Listing 9-11 to create the fn_managers function. The function accepts an input employee ID (@empid) and, optionally, a level limit (@maxlevels), and it returns managers up to the requested number of levels away from the input employee (if a limit was specified).

---------------------------------------------------------------------- Function: fn_managers, Ancestors with optional level limit --- Input : @empid INT : Employee id -@maxlevels : Max number of levels to return --- Output : @Mgrs Table: id and level of managers of -input employee in all levels <= @maxlevels --- Process : * In a loop, while current manager is not null -and previous level is smaller than @maxlevels -insert into @Mgrs current manager, -and get next level manager --------------------------------------------------------------------USE tempdb; GO IF OBJECT_ID('dbo.fn_managers') IS NOT NULL DROP FUNCTION dbo.fn_managers; GO CREATE FUNCTION dbo.fn_managers (@empid AS INT, @maxlevels AS INT = NULL) RETURNS @Mgrs TABLE ( empid INT NOT NULL PRIMARY KEY, lvl INT NOT NULL ) AS BEGIN IF NOT EXISTS(SELECT * FROM dbo.Employees WHERE empid = @empid) RETURN; DECLARE @lvl AS INT; SET @lvl = 0; -- Initialize level counter with 0 -- If input @maxlevels is NULL, set it to maximum integer -- to virtually have no limit on levels SET @maxlevels = COALESCE(@maxlevels, 2147483647); WHILE @empid IS NOT NULL -- while current employee has a manager AND @lvl <= @maxlevels -- and previous level < @maxlevels BEGIN -- Insert current manager to @Mgrs

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context.MapRoute( "NewSurvey", "survey/{tenant}/newsurvey", new { controller = "Surveys", action = "New" }); context.MapRoute( "NewQuestion", "survey/{tenant}/newquestion", new { controller = "Surveys", action = "NewQuestion" }); context.MapRoute( "AddQuestion", "survey/{tenant}/newquestion/add", new { controller = "Surveys", action = "AddQuestion" }); }

INSERT INTO @Mgrs(empid, lvl) VALUES(@empid, @lvl); SET @lvl = @lvl + 1; -- Increment level counter -- Get next level manager SET @empid = (SELECT mgrid FROM dbo.Employees WHERE empid = @empid); END RETURN; END GO

The function first checks whether the input node ID exists, and then breaks if it doesn't It then initializes the @lvl counter to zero, and it assigns the maximum possible integer to the @maxlevels variable if a NULL was specified in it to practically have no level limit The function then enters a loop that iterates as long as @empid is not null (because null represents the root's manager ID) and the current level is smaller than or equal to the requested number of levels The loop's body inserts the current employee ID along with the level counter into the @Mgrs output table variable, increments the level counter, and assigns the current employee's manager's ID to the @empid variable I should point out a couple of differences between this function and the subordinates function.

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This function uses a scalar subquery to get the manager ID in the next level, unlike the subordinates function, which used a join to get the next level of subordinates The reason for the difference is that there can be only one manager for a given employee, while there can be multiple subordinates for a given manager Also, this function uses the expression @lvl <= @maxlevels to limit the number of levels, while the subordinates function used the expression @lvl < @maxlevels The reason for the discrepancy is that this function doesn't have a separate INSERT statement to get the root employee and a separate one to get the next level of employees; rather, it has only one INSERT statement in the loop Consequently the @lvl counter here is incremented after the INSERT, while in the subordinates function it was incremented before the INSERT.