And because the expression builder of SSIS is quite worthless, the opensource addon SSIS Expression Editor & Tester could be very useful.
Strings
Filename from pathstring
This expression reverses the string to find the position of the last \ and uses that number (minus 1) in the Right expression:
- RIGHT([FilePath],FINDSTRING(REVERSE([FilePath]),"\\",1) - 1)
- RIGHT(@[User::FilePath],FINDSTRING(REVERSE(@[User::FilePath]),"\\",1) - 1)
Folderpath from pathstring
This expressions reverses the string to find the position of the last \ and deduct that number of the total length. After that you can use that number in a substring.
- SUBSTRING(@[User::FilePath], 1,
LEN(@[User::FilePath]) - FINDSTRING(REVERSE(@[User::FilePath] ), "\\" ,1 ) + 1
)
Foldername from the pathstring
This expression finds the last and second last / in the filepath and uses the those positions to find the foldername.
- SUBSTRING(@[User::FilePath],
LEN(@[User::FilePath]) - FINDSTRING(REVERSE(@[User::FilePath]),"\\",2) + 2,
(LEN(@[User::FilePath]) - FINDSTRING(REVERSE(@[User::FilePath]),"\\",1)) - (LEN(@[User::FilePath]) - FINDSTRING(REVERSE(@[User::FilePath]),"\\",2)) - 1
)
In SSIS 2012 it's a lot easier/shorter with the token expression:
- TOKEN(@[User::FilePath],"\\",TOKENCOUNT(@[User::FilePath],"\\") - 1)
If you want to give a default value for empty columns, you can check the length or you can check for NULL or you can even check both:
- LEN([STRING_COLUMN]) == 0 ? "default value" : [STRING_COLUMN]
- ISNULL([STRING_COLUMN]) ? "default value" : [STRING_COLUMN]
- ISNULL([STRING_COLUMN]) || LEN([STRING_COLUMN]) == 0 ? "default" : [STRING_COLUMN]
Numbers
Leading zeros
These two expression will add up to 5 leading zeros to a number. So "123" becomes "00123":
- RIGHT(("00000" + [STRING_COLUMN]), 5)
- REPLICATE("0", 5 - LEN([STRING_COLUMN])) + [STRING_COLUMN]
Datetimes
Date from datetime
If you want to remove the time element in a datetime object, you should cast it to DT_DBDATE. But because that datatype is very inconvenient to use, you should cast it back to the original datatype. That will set the time to 0:00.
- (DT_DATE)(DT_DBDATE)@[User::datetimeVariable]
- (DT_DATE)(DT_DBDATE)[datetimeColumn]
- (DT_DBTIMESTAMP)(DT_DBDATE)GETDATE()
Time from datetime
If you want to remove the date element in a datetime object, you should cast it to DT_DBTIME. And optional cast it to a string.
- (DT_STR,8,1252)(DT_DBTIME)@[User::datetimeVariable]
- (DT_STR,8,1252)(DT_DBTIME)[datetimeColumn]
- (DT_STR,8,1252)(DT_DBTIME)GETDATE()
First day of the current month
If you want to get the first day of the current month, you take the current datetime and deduct the current day number (minus 1). Optional you can remove the time part:
- DATEADD("d", -DAY(GETDATE()) + 1, GETDATE())
- (DT_DBTIMESTAMP)(DT_DBDATE)DATEADD("d", -DAY(GETDATE()) + 1, GETDATE())
Last dat of the current month
If you want to get the last day of the current month, you add 1 month and deduct the current day number. Optional you can remove the time part:
- DATEADD("d", -DAY(GETDATE()), DATEADD("m", 1, GETDATE()))
- (DT_DBTIMESTAMP)(DT_DBDATE)DATEADD("d", -DAY(GETDATE()), DATEADD("m", 1, GETDATE()))
- DATEADD("s", -1,DATEADD("d", -DAY(GETDATE()) + 1, DATEADD("m", 1, (DT_DBTIMESTAMP)(DT_DBDATE)GETDATE())))
Weeknumber of the month (see)
1-june-2012 is weeknumber 23 in the year, but weeknumber 1 of the month june 2012.
- (DATEPART("ww",[YourDate]) - DATEPART("ww",DATEADD("d", -DAY([YourDate]) + 1, [YourDate]))) + 1