基于默认 ASP.NET RoleProvider 的分层 SQL 角色

Question

我正在尝试对默认 ASP.NET RoleProvider 进行以下调整，以便它支持分层角色定义。但是我无法创建以下函数，它会保持执行函数...

参考：http://mark.tremaine.net/howto/hierarchical-sql-role-provider/

这个函数有什么问题吗？

    -- ================================================
    -- Template generated from Template Explorer using:
    -- Create Multi-Statement Function (New Menu).SQL
    --
    -- Use the Specify Values for Template Parameters 
    -- command (Ctrl-Shift-M) to fill in the parameter 
    -- values below.
    --
    -- This block of comments will not be included in
    -- the definition of the function.
    -- ================================================
    SET ANSI_NULLS ON
    GO
    SET QUOTED_IDENTIFIER ON
    GO
    -- =============================================
    -- Author:      <Author,,Name>
    -- Create date: <Create Date,,>
    -- Description: <Description,,>
    -- =============================================


     CREATE FUNCTION [dbo].[aspnet_Roles_Ancestor_TVF] (
     @RoleId uniqueidentifier
     )
     RETURNS
     @aspnet_Roles TABLE (
     ApplicationId uniqueidentifier
     , RoleId uniqueidentifier
     , RoleName nvarchar(256)
     , LoweredRoleName nvarchar(256)
     , Description nvarchar(256)
     , ParentRoleId uniqueidentifier
     )
     AS
     BEGIN
     ; WITH aspnet_Roles_CTE (
     ApplicationId
     , RoleId
     , RoleName
     , LoweredRoleName
     , Description
     , ParentRoleId
     , HierarchyLevel
     ) AS (
     SELECT
     ApplicationId
     , RoleId
     , RoleName
     , LoweredRoleName
     , Description
     , ParentRoleId
     , 1 AS HierarchyLevel
     FROM aspnet_Roles
     WHERE RoleId = @RoleId

     UNION ALL

     SELECT
     aspnet_Roles.ApplicationId
     , aspnet_Roles.RoleId
     , aspnet_Roles.RoleName
     , aspnet_Roles.LoweredRoleName
     , aspnet_Roles.Description
     , aspnet_Roles.ParentRoleId
     , aspnet_Roles_CTE.HierarchyLevel + 1 AS HierarchyLevel
     FROM aspnet_Roles
     INNER JOIN aspnet_Roles_CTE
     ON aspnet_Roles.RoleId = aspnet_Roles_CTE.ParentRoleId
     )

     INSERT INTO @aspnet_Roles (
     ApplicationId
     , RoleId
     , RoleName
     , LoweredRoleName
     , Description
     , ParentRoleId
     )
     SELECT
     ApplicationId
     , RoleId
     , RoleName
     , LoweredRoleName
     , Description
     , ParentRoleId
     FROM aspnet_Roles_CTE
     ORDER BY HierarchyLevel

     RETURN
     END
    GO

Answer 1

我认为问题出在 CTE 的结构上。 Union 查询的前半部分应代表父项，第二部分应返回子项。也就是说，你是沿着层次结构走下去，而不是向上走。因此，我会将 Union 查询后半部分的 On 子句更改为：

aspnet_Roles_CTE.RoleId = aspnet_Roles.ParentRoleId。

编辑

一些示例数据会有所帮助。这是我发起的一个小测试：

Declare @RoleId int;
Set @RoleId = 1;

With aspnet_Roles As
    (
    Select 1 As ApplicationId, 1 As RoleId, 'Parent Role A' As RoleName, Null As ParentRoleId
    Union All Select 1, 2, 'Parent Role B', Null
    Union All Select 1, 3, 'Parent Role C', Null
    Union All Select 1, 4, 'Child Role A-A', 1
    Union All Select 1, 5, 'Child Role A-B', 1
    Union All Select 1, 6, 'Child Role A-C', 1
    Union All Select 1, 7, 'Child Role A-A-A', 4
    Union All Select 1, 8, 'Child Role A-A-B', 4
    Union All Select 1, 9, 'Child Role A-A-C', 4
    )
    , aspnet_Roles_CTE ( ApplicationId, RoleId, RoleName, ParentRoleId, HierarchyLevel ) As
    (
    Select ApplicationId, RoleId, RoleName, ParentRoleId, 1 AS HierarchyLevel
    From aspnet_Roles
    Where RoleId = @RoleId
    Union All
    Select AR.ApplicationId, AR.RoleId, AR.RoleName, AR.ParentRoleId, HierarchyLevel + 1
    From aspnet_Roles As AR
        Join aspnet_Roles_CTE As CTE
            On CTE.ApplicationId = AR.ApplicationId
                And CTE.RoleId = AR.ParentRoleId
     )
Select ApplicationId, RoleId, RoleName, ParentRoleId, HierarchyLevel
From aspnet_Roles_CTE

结果：

ApplicationId | RoleId | RoleName         | ParentRoleId | HierarchyLevel
1             | 1      | Parent Role A    | NULL         | 1
1             | 4      | Child Role A-A   | 1            | 2
1             | 5      | Child Role A-B   | 1            | 2
1             | 6      | Child Role A-C   | 1            | 2
1             | 7      | Child Role A-A-A | 4            | 3
1             | 8      | Child Role A-A-B | 4            | 3
1             | 9      | Child Role A-A-C | 4            | 3

Answer 2

我知道 CTE 有递归耗尽限制，但也许你有一个孩子的父母的孩子，即循环关系？