如何使用SQL查询显示像父子一样的层次结构行

Question

如何使用SQL查询显示像父子一样的层次结构行

Vik*_*ash 6 t-sql sql-server sql-server-2008

我在我的应用程序中使用博客评论,我在一个表中插入每个评论行,所以如果他们中的任何一个回复特定评论,点击commentid我插入replyid新行.

屏幕截图如下:

在这里你可以看到commentid24和26有replycommentid23.我需要一个查询显示24和26之后23.因为23是24和26的父.

以下是表格布局和示例数据的设置脚本:

USE [myDB]
GO
/****** Object:  Table [dbo].[Blog_CommentDetails]    Script Date: 11/12/2016 6:36:04 PM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Blog_CommentDetails](
    [CommentID] [int] IDENTITY(1,1) NOT NULL,
    [CommentUserName] [nvarchar](200) NOT NULL,
    [CommentText] [nvarchar](max) NULL,
    [CommentApprovedByUserID] [int] NULL,
    [CommentPostDocumentID] [int] NOT NULL,
    [CommentDate] [datetime] NULL DEFAULT (getdate()),
    [HtmlComment] [nvarchar](max) NULL,
    [CommentIsSpam] [bit] NULL CONSTRAINT [DEFAULT_Blog_MainComment_CommentIsSpam]  DEFAULT ((0)),
    [CommentIsApproved] [bit] NULL CONSTRAINT [DEFAULT_Blog_MainComment_CommentIsApproved]  DEFAULT ((0)),
    [CommentEmail] [nvarchar](250) NULL,
    [CommentInfo] [nvarchar](max) NULL,
    [ReplyCommentID] [int] NULL
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

GO
SET IDENTITY_INSERT [dbo].[Blog_CommentDetails] ON 

GO
INSERT [dbo].[Blog_CommentDetails] ([CommentID], [CommentUserName], [CommentText], [CommentApprovedByUserID], [CommentPostDocumentID], [CommentDate], [HtmlComment], [CommentIsSpam], [CommentIsApproved], [CommentEmail], [CommentInfo], [ReplyCommentID]) VALUES (22, N'Vikash', N'This is main comment', NULL, 1, CAST(N'2016-11-12 17:36:25.637' AS DateTime), N'<div class="main-comment-section"><div class="row"><div class="col-xs-12"><div class="post-comment-section"><p id="pCommentorName"><span id="sCommentorName" class="blogcommentname">Vikash</span><span id="sBlogPostedDate">Nov12,2016 5:35PM</span></p><p class="comment-detail" id="pBlogCommentDetails">This is main comment</p><div class="comment-reply"><ul><li><img src="assets/svg/components/blog-detail/icon_reply.svg" alt="Reply comment icon"><a class="joinus-link" id="btnComment" href="#" target="_self">::blogdetailsReply</a></li></ul></div></div></div></div></div>', 0, 1, N'vikash.kr@sonata-software.com', NULL, NULL)
GO
INSERT [dbo].[Blog_CommentDetails] ([CommentID], [CommentUserName], [CommentText], [CommentApprovedByUserID], [CommentPostDocumentID], [CommentDate], [HtmlComment], [CommentIsSpam], [CommentIsApproved], [CommentEmail], [CommentInfo], [ReplyCommentID]) VALUES (23, N'Megha k', N'This is reply comment', NULL, 1, CAST(N'2016-11-12 17:39:04.250' AS DateTime), N'<div class="reply-comment-section"><div class="row"><div class="col-xs-12"><div class="post-comment-section"><p id="pBlogReplyCommentorName"><span id="sReplyCommentorName" class="blogcommentname">Megha k</span><span id="sBlogReplyCommentDate">Nov12,2016 5:38PM</span></p><p class="comment-detail" id="pBlogReplyCommentDetails">This is reply comment</p><div class="comment-reply"><ul><li><img class="contributors-list" src="assets/svg/components/blog-detail/icon_reply.svg" alt="Reply comment icon"><a class="joinus-link" id="btnCommentReply" href="#" target="_self">::blogdetailsReply</a></li></ul></div></div></div></div></div>', 0, 1, N'megha.k@sonata-software.com', NULL, NULL)
GO
INSERT [dbo].[Blog_CommentDetails] ([CommentID], [CommentUserName], [CommentText], [CommentApprovedByUserID], [CommentPostDocumentID], [CommentDate], [HtmlComment], [CommentIsSpam], [CommentIsApproved], [CommentEmail], [CommentInfo], [ReplyCommentID]) VALUES (24, N'Siddappa H', N'This is reply text.', NULL, 1, CAST(N'2016-11-12 17:39:58.847' AS DateTime), N'<div class="main-comment-section"><div class="row"><div class="col-xs-12"><div class="post-comment-section"><p id="pCommentorName"><span id="sCommentorName" class="blogcommentname">Siddappa H</span><span id="sBlogPostedDate">Nov12,2016 5:39PM</span></p><p class="comment-detail" id="pBlogCommentDetails">This is reply text.</p><div class="comment-reply"><ul><li><img src="assets/svg/components/blog-detail/icon_reply.svg" alt="Reply comment icon"><a class="joinus-link" id="btnComment" href="#" target="_self">::blogdetailsReply</a></li></ul></div></div></div></div></div>', 0, 1, N'siddappa.h@sonata-software.com', NULL, 23)
GO
INSERT [dbo].[Blog_CommentDetails] ([CommentID], [CommentUserName], [CommentText], [CommentApprovedByUserID], [CommentPostDocumentID], [CommentDate], [HtmlComment], [CommentIsSpam], [CommentIsApproved], [CommentEmail], [CommentInfo], [ReplyCommentID]) VALUES (25, N'Suresh P', N'This is reply comment', NULL, 1, CAST(N'2016-11-12 17:40:44.470' AS DateTime), N'<div class="reply-comment-section"><div class="row"><div class="col-xs-12"><div class="post-comment-section"><p id="pBlogReplyCommentorName"><span id="sReplyCommentorName" class="blogcommentname">Suresh P</span><span id="sBlogReplyCommentDate">Nov12,2016 5:40PM</span></p><p class="comment-detail" id="pBlogReplyCommentDetails">This is reply comment</p><div class="comment-reply"><ul><li><img class="contributors-list" src="assets/svg/components/blog-detail/icon_reply.svg" alt="Reply comment icon"><a class="joinus-link" id="btnCommentReply" href="#" target="_self">::blogdetailsReply</a></li></ul></div></div></div></div></div>', 0, 1, N'suresh.p@sonata-software.com', NULL, NULL)
GO
INSERT [dbo].[Blog_CommentDetails] ([CommentID], [CommentUserName], [CommentText], [CommentApprovedByUserID], [CommentPostDocumentID], [CommentDate], [HtmlComment], [CommentIsSpam], [CommentIsApproved], [CommentEmail], [CommentInfo], [ReplyCommentID]) VALUES (26, N'Vikash', N'This is reply text', NULL, 1, CAST(N'2016-11-12 17:41:44.673' AS DateTime), N'<div class="reply-comment-section"><div class="row"><div class="col-xs-12"><div class="post-comment-section"><p id="pBlogReplyCommentorName"><span id="sReplyCommentorName" class="blogcommentname">Vikash</span><span id="sBlogReplyCommentDate">Nov12,2016 5:40PM</span></p><p class="comment-detail" id="pBlogReplyCommentDetails">This is reply text</p><div class="comment-reply"><ul><li><img class="contributors-list" src="assets/svg/components/blog-detail/icon_reply.svg" alt="Reply comment icon"><a class="joinus-link" id="btnCommentReply" href="#" target="_self">::blogdetailsReply</a></li></ul></div></div></div></div></div>', 0, 1, N'vikash.kr@sonata-software.com', NULL, 23)
GO
SET IDENTITY_INSERT [dbo].[Blog_CommentDetails] OFF
GO

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欢迎所有建议!

我在下面添加了三个插入查询:

Valex,请在表中插入此查询,即"INSERT [dbo].[Blog_CommentDetails]([CommentID],[CommentUserName],[CommentText],[CommentApprovedByUserID],[CommentPostDocumentID],[CommentDate],[HtmlComment],[ CommentIsSpam],[CommentIsApproved],[CommentEmail],[CommentInfo],[ReplyCommentID],[IsRejected])VALUES(58,N'Vicky',N'Test',0,1,CAST(N'2016-12-02) 11:51:07.270'AS DateTime),N'VickyDec2,2016 11:47 AM

测试

答复',0,1,N'vicky @ gmail.com',NULL,NULL,0)GO INSERT [dbo].[Blog_CommentDetails]([CommentID],[CommentUserName],[CommentText],[CommentApprovedByUserID],[CommentPostDocumentID] ,[CommentDate],[HtmlComment],[CommentIsSpam],[CommentIsApproved],[CommentEmail],[CommentInfo],[ReplyCommentID])VALUES(61,N'Billu',N'This是评论测试',0,1, CAST(N'2016-12-02 12:35:40.220'AS DateTime),N'BilluDec2,2016 12:34 PM

这是评论测试

答复',0,1,N'billu @ gmail.com',NULL,58)GO INSERT [dbo].[Blog_CommentDetails]([CommentID],[CommentUserName],[CommentText],[CommentApprovedByUserID],[CommentPostDocumentID],[ CommentDate],[HtmlComment],[CommentIsSpam],[CommentIsApproved],[CommentEmail],[CommentInfo],[ReplyCommentID])VALUES(62,N'Rakesh',N'This是rakesh test',0,1,CAST( N'2016-12-02 12:37:42.133'AS DateTime),N'RakeshDec2,2016 12:36 PM

这是rakesh测试

答复',0,1,N'rakesh @ gmail.com',NULL,58)

我现在正在编辑我的问题.请检查下面的屏幕截图:

我使用下面的查询:

WITH CTE AS ( SELECT CommentID ,

                     CommentPostDocumentID ,
                     CommentIsApproved,
                     CommentDate ,
                     ReplyCommentID ,
                     CommentUserName,
                     CommentID AS ThreadID ,
                     CAST( CommentID AS VARCHAR( MAX ) ) AS PathStr
              FROM Blog_CommentDetails AS T WITH(NOLOCK)
              WHERE ReplyCommentID IS NULL
              UNION ALL
              SELECT T.CommentID ,

                     t.CommentPostDocumentID ,
                     t.CommentIsApproved,
                     T.CommentDate ,
                     T.ReplyCommentID ,
                     T.CommentUserName,
                     CTE.ThreadID ,
                     PathStr + '-'+ CAST( T.ReplyCommentID AS VARCHAR( MAX ) ) AS PathStr
              FROM Blog_CommentDetails AS T WITH(NOLOCK)
              JOIN CTE 
              ON T.ReplyCommentID = CTE.CommentID
              WHERE T.ReplyCommentID IS NOT NULL )
            SELECT *
            FROM CTE
            WHERE CommentPostDocumentID = 18 AND CommentIsApproved=1
            ORDER BY ThreadID ,
                        PathStr ,
                        CommentDate DESC

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以下是显示评论的图片:

以下是预期的结构:

维卡什评论
Sid在vikash评论中回复.
Megha评论vikash所以megha评论比Sid在父母Vikash下更高.
QE回答了Megha的评论,所以他应该比Sid更好,但它排在最后一排.

Answer 1

val*_*lex 2

您应该使用递归 CTE。这是您后来的问题的改编

\n\n

WITH CTE AS\n(\n   SELECT CommentID, CommentUserName, CommentText,CommentDate,ReplyCommentID,\n          CommentID as ThreadID,\n          CAST(CommentID as varchar(MAX)) as PathStr\n   FROM Blog_CommentDetails as T \n   WHERE ReplyCommentID IS NULL\n\n   UNION ALL\n\n   SELECT T.CommentID, T.CommentUserName, t.CommentText,T.CommentDate,\n          T.ReplyCommentID,\n          CTE.ThreadID,\n          PathStr+\'-\'\n          +CAST(T.ReplyCommentID as varchar(MAX)) as PathStr\n   FROM Blog_CommentDetails as T \n   JOIN CTE ON T.ReplyCommentID = CTE.CommentID\n   WHERE T.ReplyCommentID IS NOT NULL\n)\n\nSELECT * FROM CTE ORDER BY ThreadID,PathStr,CommentID, CommentDate desc\n

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结果：

\n\n

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CommentID \xe2\x95\x91 CommentUserName \xe2\x95\x91      CommentText      \xe2\x95\x91       CommentDate       \xe2\x95\x91 ReplyCommentID \xe2\x95\x91 ThreadID \xe2\x95\x91 PathStr 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       22 \xe2\x95\x91 Vikash          \xe2\x95\x91 This is main comment  \xe2\x95\x91 2016-11-12 17:36:25.637 \xe2\x95\x91 NULL           \xe2\x95\x91       22 \xe2\x95\x91 22      \xe2\x95\x91\n\xe2\x95\x91        23 \xe2\x95\x91 Megha k         \xe2\x95\x91 This is reply comment \xe2\x95\x91 2016-11-12 17:39:04.250 \xe2\x95\x91 NULL           \xe2\x95\x91       23 \xe2\x95\x91 23      \xe2\x95\x91\n\xe2\x95\x91        24 \xe2\x95\x91 Siddappa H      \xe2\x95\x91 This is reply text.   \xe2\x95\x91 2016-11-12 17:39:58.847 \xe2\x95\x91 23             \xe2\x95\x91       23 \xe2\x95\x91 23-23   \xe2\x95\x91\n\xe2\x95\x91        26 \xe2\x95\x91 Vikash          \xe2\x95\x91 This is reply text    \xe2\x95\x91 2016-11-12 17:41:44.673 \xe2\x95\x91 23             \xe2\x95\x91       23 \xe2\x95\x91 23-23   \xe2\x95\x91\n\xe2\x95\x91        25 \xe2\x95\x91 Suresh P        \xe2\x95\x91 This is reply comment \xe2\x95\x91 2016-11-12 17:40:44.470 \xe2\x95\x91 NULL           \xe2\x95\x91       25 \xe2\x95\x91 25      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