我有递归SQL函数的问题。原来的问题是我有一份员工名单,他们每个人都有各种培训。这些培训中的每一项都有一些预先要求。例如要获得您的1类驾驶执照,您必须拥有您的5类。如果我删除了5类,我需要检查是否禁用1类。在Visual Studio(ado.net)中超出了最大存储过程,函数,触发器或视图嵌套级别,但在SQL服务器中没有。
现在,因为这是一棵没有固定最大深度的树(实际上我停检查10ish)我决定使用递归。我写了两个存储过程
[dbo].[spCheckTrainingPreqs]
@PIN int,
@training_id int,
@missingTraining int OUTPUT
和
[dbo].[spCheckTrainingPreqsEmployee]
@PIN int
现在,当我打电话spCheckTrainingPreqsEmployee与雇员数它为每个引脚/ training_id组合光标并调用spCheckTrainingPreqs。 spCheckTrainingPreqs使用递归本地游标来遍历树。
现在踢球。它工作正常,在Visual Studio
DECLARE @return_value int
EXEC @return_value = [dbo].[spCheckTrainingPreqsEmployee]
@PIN = 12673
SELECT 'Return Value' = @return_value
GO
但是,如果我去到Visual Studio中,并将其添加到表适配器没有返回一个存储过程我得到的错误“最大存储过程,函数,触发器或视图的嵌套水平超过(限制32)“
我检查过我的表没有触发器。唯一的复杂性是,许多表的视图基于它们的子查询,甚至是c#编码的自定义串联函数。请记住从SQL管理器运行它工作正常。
参考的完整代码
/****** Object: StoredProcedure [dbo].[spCheckTrainingPreqs] Script Date: 08/31/2010 10:13:36 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROC [dbo].[spCheckTrainingPreqs]
@PIN int,
@training_id int,
@missingTraining int OUTPUT
AS
-- get the Prerequisites
declare @requiresID int
declare CurPrereqs cursor local for SELECT RequiresID FROM TrainingPrerequisites WHERE SourceID = @training_id
SET @missingTraining = 0
OPEN CurPrereqs
FETCH NEXT FROM CurPrereqs INTO @requiresID
WHILE @@FETCH_STATUS = 0
BEGIN
IF (@missingTraining = 0) -- stop when a missing training is found
BEGIN
IF (SELECT count(training_id) FROM employee_training WHERE PIN = @PIN AND training_id = @requiresID GROUP BY training_id) = 1
BEGIN
--they have the training
IF (@@NESTLEVEL < 10) -- we only check 10 levels deep
BEGIN
EXEC spCheckTrainingPreqs @PIN, @requiresID, @missingTraining
UPDATE employee_training SET missingPreReq = @missingTraining WHERE training_id = @training_id and PIN = @PIN;
END
END
ELSE
BEGIN
SET @missingTraining = @requiresID
UPDATE employee_training SET missingPreReq = @missingTraining WHERE training_id = @training_id and PIN = @PIN;
CLOSE CurPrereqs
DEALLOCATE CurPrereqs;
RETURN
END
END
FETCH NEXT FROM CurPrereqs INTO @requiresID
END
CLOSE CurPrereqs
DEALLOCATE CurPrereqs;
和
/****** Object: StoredProcedure [dbo].[spCheckTrainingPreqsEmployee] Script Date: 08/31/2010 10:28:27 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Create date: 08/31/2010
-- Description: Checks all pre reqs for an employee
-- =============================================
ALTER PROCEDURE [dbo].[spCheckTrainingPreqsEmployee]
@PIN int
AS
BEGIN
SET NOCOUNT ON;
declare @training_id int
declare @missingTraining int
SET @missingTraining = 0
declare CurPrereqsE cursor local for SELECT training_id FROM employee_training WHERE PIN = @PIN
OPEN CurPrereqsE
FETCH NEXT FROM CurPrereqsE INTO @training_id
WHILE @@FETCH_STATUS = 0
BEGIN
EXEC spCheckTrainingPreqs @PIN, @training_id, @missingTraining
FETCH NEXT FROM CurPrereqsE INTO @training_id
END
CLOSE CurPrereqsE
DEALLOCATE CurPrereqsE;
END
所以,如果我忽略错误,只是使用它似乎工作,但我仍然担心错误。 – Jeff 2010-08-31 21:06:45