8

我正在尝试使标签搜索正常工作，并且除了 LIKE 标签匹配之外，它主要工作。

我已将示例代码添加到SQLFiddle以供使用，并将其包含在此处：

表格和数据

CREATE TABLE Attendees
(
 Id INT,
 Text VARCHAR(500)
);


CREATE TABLE Tags
(
 Id INT,
 Description VARCHAR(50)
);

CREATE TABLE AttendeeTags
(
 AttendeeId INT,
 TagId INT,
 Value VARCHAR(50)
);

INSERT INTO Attendees VALUES (1, 'Attendee 1');
INSERT INTO Attendees VALUES (2, 'Attendee 2');

INSERT INTO Tags VALUES (1, 'Tag Name 1');
INSERT INTO Tags VALUES (2, 'Tag Name 2');

INSERT INTO AttendeeTags VALUES (1, 1, 'Value 1');
INSERT INTO AttendeeTags VALUES (1, 1, 'Value 2');
INSERT INTO AttendeeTags VALUES (1, 2, 'Value 1');
INSERT INTO AttendeeTags VALUES (1, 2, 'Value 2');
INSERT INTO AttendeeTags VALUES (2, 1, 'Value 1');

询问

DECLARE @MandatoryTagXml XML 

SET @MandatoryTagXml = '<tags><tag><description>Tag Name 1</description><value>Value 2</value></tag></tags>'

;WITH MandatoryTags AS
         (
          SELECT TagValue.value('(./value)[1]', 'nvarchar(100)') AS value,
                 TagValue.value('(./description)[1]', 'nvarchar(100)') AS [description]       
          FROM @MandatoryTagXml.nodes('/tags/tag') AS T(TagValue)
          )

SELECT DISTINCT A.Id [AttendeeId]
        FROM [dbo].[Attendees] A
        INNER JOIN [dbo].[AttendeeTags] AT ON AT.AttendeeId = AttendeeId
        INNER JOIN [dbo].[Tags] T ON T.Id = AT.TagId AND T.[Description] IN (SELECT [description] FROM MandatoryTags)
        WHERE NOT EXISTS (
                        SELECT T.Id, c.value
                        FROM MandatoryTags c 
                        JOIN Tags T
                            ON c.[description] = T.[Description]
                        -- Add LIKE match to value - This is the problem line
                        JOIN AttendeeTags AT
                            ON AT.Value LIKE '%' + C.[Value] + '%'
                        EXCEPT
                        SELECT ATT.TagId, ATT.Value
                        FROM [AttendeeTags] ATT
                        WHERE ATT.AttendeeId = A.Id                          
                        )

我想要的是当 Tags.Description 与 @MandatoryTagXml 中的描述完全匹配时获得结果，并且 AttendeeTags.Value 类似于 @MandatoryTagXml 中提供的值

如果没有以下行，事情将按预期工作（即当 XML 完全匹配时）

JOIN AttendeeTags AT ON AT.Value LIKE '%' + C.[Value] + '%'

但是当我包含它时，我开始得到不正确的结果。例如设置值应该返回两个参加者.Id，但它不返回任何结果。

我已经尝试了 EXISTS 和 NOT EXISTS 以及 EXCEPT 和 INTERSECT 等的各种组合，但无法让它在所有情况下都能正常工作。

任何人都可以就如何使其工作提供任何建议吗？

4

2 回答 2

2

我认为你的加入比需要的更复杂......

DECLARE @MandatoryTagXml XML 

SET @MandatoryTagXml = '
<tags>
<tag><description>Tag Name 1</description><value>Value 1</value></tag>
<tag><description>Tag Name 2</description><value>Value 2</value></tag>
</tags>'

;WITH MandatoryTags AS
         (
          SELECT TagValue.value('(./value)[1]', 'nvarchar(100)') AS value,
                 TagValue.value('(./description)[1]', 'nvarchar(100)') AS [description]       
          FROM @MandatoryTagXml.nodes('/tags/tag') AS T(TagValue)
          )

SELECT A.Id [AttendeeId]
FROM [dbo].[Attendees] A
  INNER JOIN [dbo].[AttendeeTags] AT
    INNER JOIN [dbo].[Tags] T
    ON T.Id = AT.TagId
  ON AT.AttendeeId = A.Id

  INNER JOIN MandatoryTags m
  ON T.Description = m.Description
  AND AT.Value LIKE ('%' + m.Value + '%')
GROUP BY A.Id
-- Make sure that all of the tags are matched
HAVING COUNT(*) = (SELECT COUNT(*) FROM MandatoryTags)

更新：我已更改 SQL 以强制匹配 xml 中的所有标签。

于 2013-09-09T14:46:08.780 回答
1

在子查询中用 AT.value 替换 C.value，这里是链接：
http ://sqlfiddle.com/#!6/3d9e9/39

 WHERE NOT EXISTS (
                    SELECT T.Id, AT.Value
                    FROM MandatoryTags c 
                    JOIN Tags T
                        ON c.[description] = T.[Description]
                    -- Add LIKE match to value - This is the problem line
                    JOIN AttendeeTags AT
                        ON AT.Value LIKE '%' + C.[Value] + '%'
于 2013-09-09T14:44:08.613 回答