SQL Server CTE 语句 Varbinary(MAX) 不返回 RootID

Question

我有一个层次表来存储二叉树。我正在使用递归查询来检索基于IntroducerID 作为“RootID”的树级别。返回的值符合我的预期，但在 AgentId 数字增量达到 116 后，此 CTE 查询不会以分层形式返回 Level 值。

就像它无法再追踪 RootID 一样。

这就是我的表结构的样子；

CREATE TABLE [dbo].[TblHierarchy]
(
      [ID] [bigint] IDENTITY(1,1) NOT NULL,
      [AgentID] [bigint] NULL,
      [AgentName] [varchar](50) NULL,
      [RootID] [bigint] NULL,
      [IntroducerID] [bigint] NULL,
      [Description] [varchar](50) NULL,
      [HierarchyTree] [hierarchyid] NULL
) ON [PRIMARY]

以下是表格中的示例数据；

INSERT [dbo].[TblHierarchy] ([ID], [AgentID], [AgentName], [RootID], [IntroducerID], [Description], [HierarchyTree]) 
VALUES (1, 1, N'Toh', 0, NULL, N'', NULL)

INSERT [dbo].[TblHierarchy] ([ID], [AgentID], [AgentName], [RootID], [IntroducerID], [Description], [HierarchyTree]) 
VALUES (2, 2, N'Man', 1, 0, N'Child of Toh', NULL)

INSERT [dbo].[TblHierarchy] ([ID], [AgentID], [AgentName], [RootID], [IntroducerID], [Description], [HierarchyTree]) 
VALUES (3, 3, N'Rul', 1, 0, N'Child of Toh', NULL)

INSERT [dbo].[TblHierarchy] ([ID], [AgentID], [AgentName], [RootID], [IntroducerID], [Description], [HierarchyTree]) 
VALUES (4, 4, N'Rafiq', 2, 2, N'Child of Man', NULL)

INSERT [dbo].[TblHierarchy] ([ID], [AgentID], [AgentName], [RootID], [IntroducerID], [Description], [HierarchyTree]) 
VALUES (5, 5, N'Paan', 2, 2, N'Child of Man', NULL)

这是检索信息的查询。

WITH CTE AS
(
    SELECT 
        H1.AgentID,
        H1.RootID,
        H1.AgentName,
        H1.Description [Parent],
        Description [Self Description],
        CAST(AgentID AS varbinary(MAX)) [Level],
        CAST (h1.AgentID AS varchar(max)) [LevelID],
        CAST (H1.IntroducerID AS varchar(max)) [IntroducerID]
    FROM 
        TblHierarchy H1
    WHERE 
        H1.RootID = 3

    UNION ALL 

    SELECT 
        H2.AgentID,
        H2.RootID,
        H2.AgentName,
        c.[Self Description],
        Description [Self Description],
        c.[Level]+CAST(h2.AgentID AS varbinary(MAX)) AS [Level] ,
        c.[LevelID] + '>' + CAST (h2.AgentID AS varchar(max)) [LevelID],
        CAST (H2.IntroducerID AS varchar(max)) [IntroducerID]
    FROM
        TblHierarchy H2
    INNER JOIN 
        CTE c ON h2.RootID = c.AgentID
)
SELECT *
FROM CTE 
CROSS APPLY 
    (SELECT 
         SUBSTRING(LevelID, 1, CHARINDEX('>', LevelID + '>') - 1) ) c(RootLevelID) 
ORDER BY 
    [Level] DESC
OPTION (MAXRECURSION 0) 

Answer 1

我不完全了解您的需求（尤其是您想要通过所有这些铸造实现的目标......），但请查看：

编辑：经过一番思考，我希望我明白了

我删除了我之前的建议，即我必须更改您的输入数据。以下使用您的输入数据不变，并通过 AgentID 和 RootID 链接。

CREATE TABLE [dbo].[TblHierarchy](
      [ID] [bigint] IDENTITY(1,1) NOT NULL,
      [AgentID] [bigint] NULL,
      [AgentName] [varchar](50) NULL,
      [RootID] [bigint] NULL,
      [IntroducerID] [bigint] NULL,
      [Description] [varchar](50) NULL,
      [HierarchyTree] [hierarchyid] NULL
      ) ON [PRIMARY];


INSERT [dbo].[TblHierarchy] ( [AgentID], [AgentName], [RootID], [IntroducerID], [Description], [HierarchyTree]) 
VALUES 
( 1, N'Toh', 0, NULL, N'', NULL)
,( 2, N'Man', 1, 0, N'Child of Toh', NULL)
,( 3, N'Rul', 1, 0, N'Child of Toh', NULL)
,( 4, N'Rafiq', 2, 2, N'Child of Man', NULL)
,( 5, N'Paan', 2, 2, N'Child of Man', NULL)

SELECT * FROM dbo.TblHierarchy;

WITH recCTE AS
(
    SELECT h.ID
          ,h.AgentID
          ,h.AgentName
          ,h.RootID
          ,h.IntroducerID
          ,h.[Description]
          ,CAST(h.[Description] AS VARCHAR(MAX)) AS HierDescr
    FROM dbo.TblHierarchy AS h WHERE h.IntroducerID IS NULL

    UNION ALL

    SELECT h.ID
          ,h.AgentID
          ,h.AgentName
          ,h.RootID
          ,h.IntroducerID
          ,h.[Description]
          ,r.HierDescr + '/' + h.[Description]
    FROM recCTE AS r
    INNER JOIN dbo.TblHierarchy AS h ON h.RootID=r.AgentID
)
SELECT * FROM recCTE
GO
DROP TABLE [dbo].[TblHierarchy];