Mystery variable in connection string

[hedgracer]

I have the following connection string in Connection Manager - Connection - Properties - Expressions - Connection String:

LEN((DT_WSTR, 2) DATEPART("MM", DATEADD("dd", -1,GETDATE())) + (DT_WSTR, 2) DATEPART("dd", DATEADD("dd", -1,GETDATE()))) == 4 ?
"\\\\Fileserver\\Etl\\Accounting\\DataArchive\\CurrData\\ANODTN" + (DT_WSTR, 2) DATEPART("MM", DATEADD("dd", -1,GETDATE())) + (DT_WSTR, 2) DATEPART("dd", DATEADD("dd", -1,GETDATE())) + ".CSV" :
LEN((DT_WSTR, 2) DATEPART("MM", DATEADD("dd", -1,GETDATE())) + (DT_WSTR, 2) DATEPART("dd", DATEADD("dd", -1,GETDATE()))) == 2 ?
"\\\\Fileserver\\Etl\\Accounting\\DataArchive\\CurrData\\ANODTN" + "0" + (DT_WSTR, 2) DATEPART("MM", DATEADD("dd", -1,GETDATE())) + "0" + (DT_WSTR, 2) DATEPART("dd", DATEADD("dd", -1,GETDATE())) + ".CSV" :
LEN((DT_WSTR, 2) DATEPART("MM", DATEADD("dd", -1,GETDATE())) + (DT_WSTR, 2) DATEPART("dd", DATEADD("dd", -1,GETDATE()))) == 3 && LEN((DT_WSTR, 2) DATEPART("MM", DATEADD("dd", -1,GETDATE()))) == 1 ?
"\\\\Fileserver\\Etl\\Accounting\\DataArchive\\CurrData\\ANODTN" + "0" + (DT_WSTR, 2) DATEPART("MM", DATEADD("dd", -1,GETDATE())) + (DT_WSTR, 2) DATEPART("dd", DATEADD("dd", -1,GETDATE())) + ".CSV" :
"\\\\Fileserver\\Etl\\Accounting\\DataArchive\\CurrData\\ANODTN" + (DT_WSTR, 2) DATEPART("MM", DATEADD("dd", -1,GETDATE())) + "0" + (DT_WSTR, 2) DATEPART("dd", DATEADD("dd", -1,GETDATE())) + ".CSV"

The problem that I have is with DT_WSTR. It looks like a variable but I cannot find it in the ssis package. Needless to say, I have no documentation on this package and the person who developed this package is long gone from our organization. Can someone point me in the (somewhat) of the right direction to look for this (maybe) variable? Thanks for any help in advance. If you need more information I can provide it. Once again, thanks.

Dave

 

[MDXer]

DT_WSTR is a SSIS Datatype SSIS doesn't use int and varchar. DT_WSTR is a unicode string the DT_WSTR.

It appears to be creating file names based on the current process date.

 

[paulkeys]

As MDXer says - DT_WSTR is the Unicode datatype in SSIS.

The function you posted contains lots of (DT_WSTR,2), which is the type cast to convert data to Unicode string, length 2