Get part of variable and provide to others variable

Question

Hi,
I am having V_Flatfilename variable
in ssis package which is used to store the filepath with file name in sql table.
I want to get only filename and give to another variable using expression
another variable is V_Src_Filename
V_Flatfilename=\\RLDEVOLP04\IncomingFiles\TESTFILES\FBDET_ZZ_150402054946.txt
my output should be like FBDET_ZZ
In sql I am getting filename using below logic
SUBSTRING(FileName,38,LEN(FileName)-54)
Kindly suggeste correct expression ,
thanks & regards,
Vipin jha 
Thankx & regards, Vipin jha MCP

Answer 1

Hi Vipin,
Being a SQL Developer my solution would be as follows.
Declare @Table Table
[FileName] Varchar(50)
INSERT @Table([FileName])
Values ('FBDET_ZZ_150401055847') ,
('BRKRTE_150401055847') ,
('CLASS_120420152212') ,
('CLASS_') ,
('CLASS')
SELECT * FROM @Table;
select
[FileName]
, PATINDEX('%[0-9]%',[FileName])
, Case When PATINDEX('%[0-9]%',[FileName]) <> 0 Then
Case
When Right(SubString([FileName] , 1 , PATINDEX('%[0-9]%',[FileName])-1) , 1) = '_' Then
LEFT(SubString([FileName] , 1 , PATINDEX('%[0-9]%',[FileName])-1),LEN(SubString([FileName] , 1 , PATINDEX('%[0-9]%',[FileName])-1))-1)
ELSE
SubString([FileName] , 1 , PATINDEX('%[0-9]%',[FileName])-1)
End
ELSE
Case
When Right([FileName] , 1) = '_' Then LEFT([FileName] , Len([FileName])-1)
ELSE
[FileName]
END
End
From @Table;
Failure in Life is failure to try... PGDCA-98(South Gujarat University),MCSA (SQL 2012) , MCTS (SQL Server 2005) http://blog.vspatel.co.uk/