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data from flat file
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Confusing Queries
Confusing Queries
Posted Monday, April 30, 2012 4:51 PM
SSC-Enthusiastic
Group: General Forum Members
Last Login: Sunday, July 29, 2012 2:10 PM
Points: 197,
Visits: 437
I am trying to load a flat file using SSIS. The data in the flat file is something like this
id, name, status
1, Jassy,
2,, abcd
3, v'dejr, dkfal'sdfh
when I loaded then to the SQL Server, I am getting blank spots on the places where there is no data.
1 Jassy
2 abcd
3 v'dejr dkfal'sdfh
I want null instead, what could be done in the downstream to get it done. There are 28 columns in the actual file and I am trying to avoid update query after I load data.
Thanks
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Post #1292873
Evil Kraig F
Evil Kraig F
Posted Monday, April 30, 2012 5:30 PM
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Group: General Forum Members
Last Login: Saturday, May 18, 2013 10:09 PM
Points: 5,658,
Visits: 6,100
Use a derived column that will check for blank spaces and insert the null version of the datatype into the column if that happens.
Basically, for each column, you'll do something like this as the expression (assuming it's an INT):
LTRIM(RTRIM( Column1)) == "" ? NULL(DT_UI4) : Column1
Use that as a replace columna and it'll include NULLs into the stream. For the source file to actually recognize NULL, they'd have to use the particular ANSI character that is considered it (I forget offhand) which is an unreadable character.
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Post #1292880
robert.gerald.taylor
robert.gerald.taylor
Posted Wednesday, May 02, 2012 12:14 PM
Right there with Babe
Group: General Forum Members
Last Login: Today @ 11:10 AM
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Evil Kraig F (4/30/2012)
Basically, for each column, you'll do something like this as the expression (assuming it's an INT):
LTRIM(RTRIM( Column1)) == "" ? NULL(DT_UI4) : Column1
What Evil Kraig says is spot on; one little nitpick, SSIS expressions has a TRIM() function that you can use to replace the LTRIM(RTRIM()). Something like:
TRIM(Column1)) == "" ? NULL(DT_UI4) : Column1
Post #1294093
Daniel Bowlin
Daniel Bowlin
Posted Thursday, May 03, 2012 7:32 AM
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Last Login: Today @ 8:49 AM
Points: 2,672,
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One other thing you can look at, althought I have not tested it for this purpose. In the flat file source editor on the connection manager tab there is a checkbox for "Retain null values from the source as null values in the data flow."
Post #1294594
sqlbi.vvamsi
sqlbi.vvamsi
Posted Friday, May 11, 2012 9:51 AM
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Last Login: Yesterday @ 10:11 AM
Points: 48,
Visits: 269
That idea by Dan should work.
Post #1298721
mohit_3454
mohit_3454
Posted Wednesday, June 06, 2012 5:14 AM
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Last Login: Tuesday, February 19, 2013 7:10 AM
Points: 15,
Visits: 53
I agree.. Use "Retain null values from the source as null values in the data flow" in flat file connection manager.
Post #1311753
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