使用Sql Server从完整路径解析Html文件名

在以下示例中，我需要从Sql Server SELECT语句中的完整路径解析HTML文件名：

Declare @x table(Id int primary key, form_url varchar(256))

Insert  @x values (1, 'Agents/Accounting/Agent.html')
Insert  @x values (2, 
'Modules/Vendors/Vendors/VendorInformation/Vendor.html')
Insert  @x values (3, 
'Modules/Customers/Customers/AccountInformation/Account.html?AccountNo')

Select * from @x

注意：路径之间的级别数量可变，HTML文件名后面可能有数据

我想要的输出是：

• Agent.html
• Vendor.html
• Account.html

---

您可以使用

reverse

和

charindex

将所有内容设置为最后一个斜杠，然后使用

charindex

或

子字符串

仅限制HTML页面

Declare @x table(Id int primary key, form_url varchar(256))

Insert  @x values (1, 'Agents/Accounting/Agent.html')
Insert  @x values (2, 
'Modules/Vendors/Vendors/VendorInformation/Vendor.html')
Insert  @x values (3, 
'Modules/Customers/Customers/AccountInformation/Account.html?AccountNo')

Select 
    *
    ,FullPath = right(form_url,charindex('/',reverse(form_url)) - 1) 
    ,OnlyHtml = left(right(form_url,charindex('/',reverse(form_url)) - 1) ,charindex('.html',right(form_url,charindex('/',reverse(form_url)) + 3)))
    ,AnotherOnlyHtml = right(substring(form_url,1,charindex('.html',form_url) + 4),charindex('/',reverse(substring(form_url,1,charindex('.html',form_url) + 4))) - 1) 
from @x

---

T-SQL不是为字符串操作而设计的。但有可能实现您所需要的：

Select x.*, IIF(CHARINDEX('?', sub.s) > 0,
                LEFT(sub.s, CHARINDEX('?', sub.s)-1),
                sub.s) result
from @x x
CROSS APPLY (SELECT IIF(CHARINDEX('/',form_url) > 0,
                       RIGHT(form_url,CHARINDEX('/', REVERSE(form_url))-1),
                        form_url)) sub(s);

---

如果对助手函数感兴趣。这是一个经过修改的parse/split函数，它接受两个不相似的delimeter。在您的情况下，可以是

“/”

和

“？”

。你可能注意到了一个附加的“？”以防你遗漏了一个

示例

Select * 
 From @x
 Cross Apply [dbo].[tvf-Str-Extract](form_url+'?','/','?') B

感兴趣的功能

CREATE FUNCTION [dbo].[tvf-Str-Extract] (@String varchar(max),@Delimiter1 varchar(100),@Delimiter2 varchar(100))
Returns Table 
As
Return (  

with   cte1(N)   As (Select 1 From (Values(1),(1),(1),(1),(1),(1),(1),(1),(1),(1)) N(N)),
       cte2(N)   As (Select Top (IsNull(DataLength(@String),0)) Row_Number() over (Order By (Select NULL)) From (Select N=1 From cte1 N1,cte1 N2,cte1 N3,cte1 N4,cte1 N5,cte1 N6) A ),
       cte3(N)   As (Select 1 Union All Select t.N+DataLength(@Delimiter1) From cte2 t Where Substring(@String,t.N,DataLength(@Delimiter1)) = @Delimiter1),
       cte4(N,L) As (Select S.N,IsNull(NullIf(CharIndex(@Delimiter1,@String,s.N),0)-S.N,8000) From cte3 S)

Select RetSeq = Row_Number() over (Order By N)
      ,RetPos = N
      ,RetVal = left(RetVal,charindex(@Delimiter2,RetVal)-1) 
 From  (
        Select *,RetVal = Substring(@String, N, L) 
         From  cte4
       ) A
 Where charindex(@Delimiter2,RetVal)>1

)
/*
Max Length of String 1MM characters

Declare @String varchar(max) = 'Dear [[FirstName]] [[LastName]], ...'
Select * From [dbo].[tvf-Str-Extract] (@String,'[[',']]')
*/