如何在sql中对空的短语进行子串处理？

Question

我有一个链接，我想它的子字符串成许多碎片拿到号码
例如： -

&OR=-12&MR=24560&MM=20&Mx=110&EOW=1&OW=50&OV=12&CV=-1 

我想-12，24560，20，...等 ，我做到了使用此代码

DECLARE @strprog AS NVARCHAR(MAX)--,@strLM AS NVARCHAR(20),@strLOW AS NVARCHAR(20),@strLOR AS NVARCHAR(20),@strLCR AS NVARCHAR(20), 

DECLARE @OR AS SMALLINT, @MR AS SMALLINT, @MM AS SMALLINT, @Mx AS SMALLINT, @EOW AS SMALLINT, @OW AS SMALLINT, @OV AS SMALLINT, @CV AS SMALLINT 

SET @strprog='WorkFlow/WFmain.aspx?sservice=WFAppraisalManage&showrep=1&applyRole=0&DisableApproval=1&grbCompQuest=1&EnablecompletionChk=1 
&MaxCompletionNo=110&ProficiencyValidation=0&objresulttxt=0 

&OR=-12&MR=24560&MM=20&Mx=110&EOW=1&OW=50&OV=12&CV=-1' 


SET @OR= SUBSTRING(@strprog,CHARINDEX('&OR=',@strprog)+4,CASE WHEN CHARINDEX('&',@strprog,CHARINDEX('&OR=',@strprog)+4) <=0 THEN LEN(@strprog)+1 ELSE CHARINDEX('&',@strprog,CHARINDEX('&OR=',@strprog)+4) END -CHARINDEX('&OR=',@strprog)-4 ) 
SELECT @OR 

SET @MR= SUBSTRING(@strprog,CHARINDEX('&MR=',@strprog)+4,CASE WHEN CHARINDEX('&',@strprog,CHARINDEX('&MR=',@strprog)+4) <=0 THEN LEN(@strprog)+1 ELSE CHARINDEX('&',@strprog,CHARINDEX('&MR=',@strprog)+4) END -CHARINDEX('&MR=',@strprog)-4 ) 
SELECT @MR 

SET @MM= SUBSTRING(@strprog,CHARINDEX('&MM=',@strprog)+4,CASE WHEN CHARINDEX('&',@strprog,CHARINDEX('&MM=',@strprog)+4) <=0 THEN LEN(@strprog)+1 ELSE CHARINDEX('&',@strprog,CHARINDEX('&MM=',@strprog)+4) END -CHARINDEX('&MM=',@strprog)-4 ) 
SELECT @MM 

SET @Mx= SUBSTRING(@strprog, CHARINDEX('&Mx=',@strprog)+4 ,CASE WHEN CHARINDEX('&',@strprog,CHARINDEX('&Mx=',@strprog)+4) <=0 THEN LEN(@strprog)+1 ELSE CHARINDEX('&',@strprog,CHARINDEX('&Mx=',@strprog)+4) END -CHARINDEX('&Mx=',@strprog)-4 ) 
SELECT @Mx 

SET @EOW= SUBSTRING(@strprog,CHARINDEX('&EOW=',@strprog)+5,CASE WHEN CHARINDEX('&',@strprog,CHARINDEX('&EOW=',@strprog)+5) <=0 THEN LEN(@strprog)+1 ELSE CHARINDEX('&',@strprog,CHARINDEX('&EOW=',@strprog)+5) END -CHARINDEX('&EOW=',@strprog)-5) 
SELECT @EOW 

SET @OW= SUBSTRING(@strprog,CHARINDEX('&OW=',@strprog)+4,CASE WHEN CHARINDEX('&',@strprog,CHARINDEX('&OW=',@strprog)+4) <=0 THEN LEN(@strprog)+1 ELSE CHARINDEX('&',@strprog,CHARINDEX('&OW=',@strprog)+4) END -CHARINDEX('&OW=',@strprog)-4 ) 
SELECT @OW 

SET @OV= SUBSTRING(@strprog,CHARINDEX('&OV=',@strprog)+4,CASE WHEN CHARINDEX('&',@strprog,CHARINDEX('&OV=',@strprog)+4) <=0 THEN LEN(@strprog)+1 ELSE CHARINDEX('&',@strprog,CHARINDEX('&OV=',@strprog)+4) END -CHARINDEX('&OV=',@strprog)-4 ) 
SELECT @OV 

SET @CV= SUBSTRING(@strprog,CHARINDEX('&CV=',@strprog)+4,CASE WHEN CHARINDEX('&',@strprog,CHARINDEX('&CV=',@strprog)+4) <=0 THEN LEN(@strprog)+1 ELSE CHARINDEX('&',@strprog,CHARINDEX('&CV=',@strprog)+4) END -CHARINDEX('&CV=',@strprog)-4 ) 
SELECT @CV 

问题是链接可以在任何地方 例如被剪除 -

&OR=-12&MR=24560&MM=20 

如何在停止切割时停止切割？ 有帮助吗？

Answer 1

您的所有子字符串都被等号抢先，并以＆符号结束。 为什么不创建一个循环来获取字符串，从第一个等于和号的值开始，从字符串中删除处理的字符串部分并继续执行与字符串其余部分相同的操作？

Answer 2

您可以在设置每个变量之前检查每个令牌的CHARINDEX，以查看该令牌是否完全存在于字符串中。

Answer 3

您可以在MSSQL服务器中使用XML类型将字符串分隔成多行，并获得一个带有attribute和value列的表。然后你可以选择任何属性，你从这个行集需要：

DECLARE @strprog AS NVARCHAR(MAX); 

SET @strprog='WorkFlow/WFmain.aspx?sservice=WFAppraisalManage&showrep=1& 
applyRole=0&DisableApproval=1&grbCompQuest=1&EnablecompletionChk=1 
&MaxCompletionNo=110&ProficiencyValidation=0&objresulttxt=0 
&OR=-12&MR=24560&MM=20&Mx=110&EOW=1&OW=50&OV=12&CV=-1'; 

DECLARE @xml as XML; 
SET @xml = cast(('<X>'+replace(@strprog,'&' ,'</X><X>')+'</X>') as xml); 

WITH T2 as 
(
    SELECT N.value('.', 'varchar(1000)') as val FROM @xml.nodes('X') as T(N) 
) 
SELECT LEFT(val,CHARINDEX('=',val)-1) as attribute, 
     SUBSTRING(val,CHARINDEX('=',val)+1,1000) as value 
     FROM T2; 

你得到如下行集：

╔═══════════════════════════════╦═══════════════════╗ 
║   attribute   ║  value  ║ 
╠═══════════════════════════════╬═══════════════════╣ 
║ WorkFlow/WFmain.aspx?sservice ║ WFAppraisalManage ║ 
║ showrep      ║ 1     ║ 
║ applyRole      ║ 0     ║ 
║ DisableApproval    ║ 1     ║ 
║ grbCompQuest     ║ 1     ║ 
║ EnablecompletionChk   ║ 1     ║ 
║ MaxCompletionNo    ║ 110    ║ 
║ ProficiencyValidation   ║ 0     ║ 
║ objresulttxt     ║ 0     ║ 
║ OR       ║ -12    ║ 
║ MR       ║ 24560    ║ 
║ MM       ║ 20    ║ 
║ Mx       ║ 110    ║ 
║ EOW       ║ 1     ║ 
║ OW       ║ 50    ║ 
║ OV       ║ 12    ║ 
║ CV       ║ -1    ║ 
╚═══════════════════════════════╩═══════════════════╝ 

Answer 4

DECLARE @strprog AS NVARCHAR(MAX)--,@strLM AS NVARCHAR(20),@strLOW AS NVARCHAR(20),@strLOR AS NVARCHAR(20),@strLCR AS NVARCHAR(20), 

DECLARE @OR AS SMALLINT, @MR AS SMALLINT, @MM AS SMALLINT, @Mx AS SMALLINT, @EOW AS SMALLINT, @OW AS SMALLINT, @OV AS SMALLINT, @CV AS SMALLINT 



--SELECT @MR =0, @MM =0, @Mx=0 , @EOW=0, @OW =0, @OV=0 


--&OR=-12&MR=24560&MM=20&Mx=110&EOW=1&OW=50&OV=12&CV=-1 

SET @strprog='WorkFlow/WFmain.aspx?sservice=WFAppraisalManage&showrep=1&applyRole=0&DisableApproval=1&grbCompQuest=1&EnablecompletionChk=1 
&MaxCompletionNo=110&ProficiencyValidation=0&objresulttxt=0 

&OR=-12&MR=24560&Mx=110&EOW=1&OW=50&OV=12' 

IF CHARINDEX('&OR=',@strprog) <> 0 
SET @OR= SUBSTRING(@strprog,CHARINDEX('&OR=',@strprog)+4,CASE WHEN CHARINDEX('&',@strprog,CHARINDEX('&OR=',@strprog)+4) <=0 THEN LEN(@strprog)+1 ELSE CHARINDEX('&',@strprog,CHARINDEX('&OR=',@strprog)+4) END -CHARINDEX('&OR=',@strprog)-4 ) 
SELECT @OR 

IF CHARINDEX('&MR=',@strprog) <> 0 
SET @MR= SUBSTRING(@strprog,CHARINDEX('&MR=',@strprog)+4,CASE WHEN CHARINDEX('&',@strprog,CHARINDEX('&MR=',@strprog)+4) <=0 THEN LEN(@strprog)+1 ELSE CHARINDEX('&',@strprog,CHARINDEX('&MR=',@strprog)+4) END -CHARINDEX('&MR=',@strprog)-4 ) 
SELECT @MR 

IF CHARINDEX('&MM=',@strprog) <> 0 
SET @MM= SUBSTRING(@strprog,CHARINDEX('&MM=',@strprog)+4,CASE WHEN CHARINDEX('&',@strprog,CHARINDEX('&MM=',@strprog)+4) <=0 THEN LEN(@strprog)+1 ELSE CHARINDEX('&',@strprog,CHARINDEX('&MM=',@strprog)+4) END -CHARINDEX('&MM=',@strprog)-4 ) 
SELECT @MM 

IF CHARINDEX('&Mx=',@strprog) <> 0 
SET @Mx= SUBSTRING(@strprog, CHARINDEX('&Mx=',@strprog)+4 ,CASE WHEN CHARINDEX('&',@strprog,CHARINDEX('&Mx=',@strprog)+4) <=0 THEN LEN(@strprog)+1 ELSE CHARINDEX('&',@strprog,CHARINDEX('&Mx=',@strprog)+4) END -CHARINDEX('&Mx=',@strprog)-4 ) 
SELECT @Mx 

IF CHARINDEX('&EOW=',@strprog) <> 0 
SET @EOW= SUBSTRING(@strprog,CHARINDEX('&EOW=',@strprog)+5,CASE WHEN CHARINDEX('&',@strprog,CHARINDEX('&EOW=',@strprog)+5) <=0 THEN LEN(@strprog)+1 ELSE CHARINDEX('&',@strprog,CHARINDEX('&EOW=',@strprog)+5) END -CHARINDEX('&EOW=',@strprog)-5) 
SELECT @EOW 

IF CHARINDEX('&OW=',@strprog) <> 0 
SET @OW= SUBSTRING(@strprog,CHARINDEX('&OW=',@strprog)+4,CASE WHEN CHARINDEX('&',@strprog,CHARINDEX('&OW=',@strprog)+4) <=0 THEN LEN(@strprog)+1 ELSE CHARINDEX('&',@strprog,CHARINDEX('&OW=',@strprog)+4) END -CHARINDEX('&OW=',@strprog)-4 ) 
SELECT @OW 

IF CHARINDEX('&OV=',@strprog) <> 0 
SET @OV= SUBSTRING(@strprog,CHARINDEX('&OV=',@strprog)+4,CASE WHEN CHARINDEX('&',@strprog,CHARINDEX('&OV=',@strprog)+4) <=0 THEN LEN(@strprog)+1 ELSE CHARINDEX('&',@strprog,CHARINDEX('&OV=',@strprog)+4) END -CHARINDEX('&OV=',@strprog)-4 ) 
SELECT @OV 

IF CHARINDEX('&CV=',@strprog) <> 0 
Set @CV= SUBSTRING(@strprog,CHARINDEX('&CV=',@strprog)+4,CASE WHEN CHARINDEX('&',@strprog,CHARINDEX('&CV=',@strprog)+4) <=0 THEN LEN(@strprog)+1 ELSE CHARINDEX('&',@strprog,CHARINDEX('&CV=',@strprog)+4) END -CHARINDEX('&CV=',@strprog)-4 ) 
SELECT @CV