问题
Reading from a flat file that has a column containing the year and month in the following format --> "201212".
I need to insert this into a DATETIME2 column but first I must parse it with "/" and add a "01" as the day. Such that 201212 would become 2012/12/01
My expression in my Derived Column Transformation looks like this:
(DT_DBTIMESTAMP2,0)((DT_WSTR,4)SUBSTRING(RptMthDTM,1,4) + "/" + (DT_WSTR,2)SUBSTRING(RptMthDTM,5,2) + "/" + "01")
This seems like it should work and SSIS accepts this(as in it can parse the expression) but when running the package it throws a completely useless error "An error occurred while attempting to perform a type cast." along with the column it had the error on.
I didn't build this package, it was pawned off on me and I was told to get it working.
Thanks in advance interwebs family.
回答1:
DT_DBTIMESTAMP2 can only be converted from a specific string format: yyyy-mm-dd hh:mm:ss[.fffffff]
You can use this expression instead:
(DT_DBTIMESTAMP2,0)((DT_WSTR,4)SUBSTRING(RptMthDTM,1,4) + "-" + (DT_WSTR,2)SUBSTRING(RptMthDTM,5,2) + "-" + "01 00:00:00")
More details: [http://msdn.microsoft.com/en-us/library/ms141036.aspx][1]
来源：https://stackoverflow.com/questions/13752478/ssis-derived-column-expression