TSQL-URL中的控制器和操作

Question

我的應用記錄了url請求，例如：“ / Users / Edit”，“ / News /”和“ /”。
幾乎所有的url也都可以通過web-api獲得，它在所有內容之前都有一個“ / api”。

我需要一個查詢

1. 給定“ / Users / Edit /”，我得到“ Users”和“ Edit”（可選/只要結果恆定）
2. 給定“ / Users /”，我得到“ Users”，並且為NULL
3. 給定“ /”，我得到NULL和NULL
4. 給定“ /Content/myCss.css”，我得到“內容”和（ NULL或“ myCss.css”）
5. 忽略“ / api”

基本上，我想要的是獲取控制器和該URL文本的操作...

Answer 1

您幾乎完成了。 嘗試一點xml。

-- Sample data.
declare @URLs as Table ( URL VarChar(256), Controller VarChar(256), [Action] VarChar(256) );
insert into @URLs ( URL ) values
  ( '/Users/Edit/' ),
  ( '/Users/' ),
  ( '/' ),
  ( '/Content/myCss.css' ),
  ( '/api/Users/Edit/' ),
  ( '/api/Users/' ),
  ( '/api/' ),
  ( '/api/Content/myCss.css' );
select * from @URLs;

-- Flog it into submission.
select URL, XMLURL, Ele2, Ele3, Ele4, Leonard.Controller, Leonard.[Action]
  from @URLs as U cross apply
    ( select Cast( '<root><ele>' + Replace( URL, '/', '</ele><ele>' ) + '</ele></root>' as XML ) as XMLURL ) as XU cross apply
    ( select XMLURL.value('(/root/ele)[2]', 'varchar(256)') as Ele2,
      XMLURL.value('(/root/ele)[3]', 'varchar(256)') as Ele3,
      XMLURL.value('(/root/ele)[4]', 'varchar(256)') as Ele4 ) as XE cross apply
    ( select NullIf( case when Ele2 = 'api' then Ele3 else Ele2 end, '' ) as Controller,
      NullIf( case when Ele2 = 'api' then Ele4 else Ele3 end, '' ) as [Action] ) as Leonard;

-- Update the table.
update U
  set Controller = Leonard.Controller, [Action] = Leonard.[Action]
    from @URLs as U cross apply
    ( select Cast( '<root><ele>' + Replace( URL, '/', '</ele><ele>' ) + '</ele></root>' as XML ) as XMLURL ) as XU cross apply
    ( select XMLURL.value('(/root/ele)[2]', 'varchar(256)') as Ele2,
      XMLURL.value('(/root/ele)[3]', 'varchar(256)') as Ele3,
      XMLURL.value('(/root/ele)[4]', 'varchar(256)') as Ele4 ) as XE cross apply
    ( select NullIf( case when Ele2 = 'api' then Ele3 else Ele2 end, '' ) as Controller,
      NullIf( case when Ele2 = 'api' then Ele4 else Ele3 end, '' ) as [Action] ) as Leonard;

select * from @URLs;

想法是將每個URL轉換為XML，並且路徑上的每個元素都是單獨的XML元素。 由於可以使用XML.value通過索引訪問元素，因此很容易挑選出前幾個元素，使用case忽略'api' ，並使用NullIf將任何空字符串轉換為null。

---

對於只了解T-SQL辯證法（要求每行以非數字，非字母字符開頭）的用戶，提供了以下原始示例的大寫翻譯：

;DECLARE @URLS TABLE
(URL VARCHAR
(256
)
,CONTROLLER VARCHAR
(256
)
,[ACTION] VARCHAR
(256
)
)
;INSERT @URLS
( URL
) VALUES
('/Users/Edit/'
)
,
('/Users/'
)
,
('/'
)
,
('/Content/myCss.css'
)
,
('/api/Users/Edit/'
)
,
(
'/api/Users/'
)
,
('/api/'
)
,
('/api/Content/myCss.css'
)
;SELECT
* FROM @URLS
;SELECT URL
,XMLURL
,ELE2
,ELE3
,ELE4
,LEONARD
.CONTROLLER
,LEONARD
.
[ACTION]FROM @URLS U CROSS APPLY
(SELECT CAST
('<ROOT><ELE>'
+REPLACE
(URL
,'/'
,'</ELE><ELE>'
)
+'</ELE></ROOT>'AS XML
)XMLURL
)XU CROSS APPLY
(SELECT XMLURL
.value
('(/ROOT/ELE)[2]'
,'VARCHAR(256)'
)ELE2
,XMLURL
.value
('(/ROOT/ELE)[3]'
,'VARCHAR(256)'
)ELE3
,XMLURL
.value
('(/ROOT/ELE)[4]'
,'VARCHAR(256)')ELE4
)XE CROSS APPLY
(SELECT NULLIF
(CASE WHEN ELE2
='API' THEN ELE3 ELSE ELE2 END
,''
)CONTROLLER
,NULLIF
(CASE WHEN ELE2
='API' THEN ELE4 ELSE ELE3 END
,''
)[ACTION]
)LEONARD
;