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Find last occurence of a character within a string


Find last occurence of a character within a string

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ramadesai108
ramadesai108
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Hi All,
I am trying to find the last occurence of a character within a string. I have the following code: what is the easiest way to accomplish this?

SELECT CASE WHEN FieldA IS NULL THEN '' ELSE

set @pos = charindex('\',FieldA,@pos)

while(@pos)>0
begin
set @lastpos=@pos
set @pos=charindex('\',FieldA,@pos+1)
end

SUBSTRING(FieldA ,@pos + 1, LEN(FieldA) - (@pos + 1)) END AS FileUploaded
FROM TableA

Example data of FieldA : "DirectoryA\DirectoryB\DirectoryC\FileName"
"DirectoryA\DirectoryB\FileName"

Thank you.
KenSimmons
KenSimmons
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You can use the Reverse Function to find the last occurrance.


Declare @FieldA varchar(100)
Set @FieldA = 'DirectoryA\DirectoryB\DirectoryC\FileName'

Select Substring(@FieldA,
LEN(@FieldA) -
Charindex('\',Reverse(@FieldA))+2,
LEN(@FieldA))

Ken Simmons
http://twitter.com/KenSimmons
GilaMonster
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Quickest way is to reverse the string and look for the first occurrence.

DECLARE @StringA varchar(100), @pos int
SET @stringA = 'DirectoryA\DirectoryB\FileName'

-- Where is the last '\'?

SET @pos = LEN(@StringA) - CHARINDEX('\',REVERSE(@StringA))
SELECT @pos




Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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Ramesh Saive
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Or this way too...


DECLARE @SomeFile VARCHAR(255)

SET @SomeFile = 'C:\WINDOWS\system32\FileName.xls'

SELECT RIGHT( @SomeFile, CHARINDEX( '\', REVERSE( @SomeFile ) + '\' ) - 1 )



--Ramesh


Vijaya Kadiyala
Vijaya Kadiyala
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Ramesh (4/8/2009)
Or this way too...


DECLARE @SomeFile VARCHAR(255)

SET @SomeFile = 'C:\WINDOWS\system32\FileName.xls'

SELECT RIGHT( @SomeFile, CHARINDEX( '\', REVERSE( @SomeFile ) + '\' ) - 1 )



Perfect solution..with simple trick using REVERSE...

Thanks -- Vijaya Kadiyala
www.dotnetvj.com
SQL Server Articles For Beginers



andrewd.smith
andrewd.smith
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If you're looking to retrieve the filename from a path, then this seems to do the job:

SELECT FieldA, COALESCE(RIGHT(FieldA, NULLIF(CHARINDEX('\', REVERSE(FieldA)) - 1, -1)), FieldA, '') AS Filename
FROM (
SELECT 'DirectoryA\DirectoryB\DirectoryC\FileName1' AS FieldA UNION ALL
SELECT 'DirectoryA\DirectoryB\FileName2' UNION ALL
SELECT 'FileName3' UNION ALL
SELECT 'DirectoryA\DirectoryB\' UNION ALL
SELECT '' UNION ALL
SELECT NULL
) TableA


ramadesai108
ramadesai108
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Thank you Ken Simmons, that worked. Have a nice day.
David Branscome
David Branscome
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Nice little bit of Code, Thanks!



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