topic Re: how to Load only the latest files? in QlikView

how to Load only the latest files?

Vidit — Mon, 25 Mar 2013 14:42:36 GMT

Hi All,

i need some help for the following.

i recieve data as excel sheets on monthly basis that have name in the followong format.

YYYYMMDD_data.xls

now all these files are saved in a specific folder. While loading the data i want to load the latest 2 files. e.g. if i have the following files

20130301_data.xls

20130201_data.xls

20130101_data.xls.

20121201_data,xls

than only the 20130301_data.xls and 20130201_data.xls should be loaded?

Re: how to Load only the latest files?

Anonymous — Mon, 25 Mar 2013 15:01:00 GMT

It could be something like this (please test, I can miss/mistype):

Files_src:
LOAD FileName() as File
FROM [*.xlsx] (ooxml, explicit labels, table is [Sheet1]);

File:
LOAD DISTINCT
File,
subfield(File, '_', 1) as FileDate
RESIDENT Files_src
DROP TABLE Files_src;

LatestFiles:
FIRST 2
LOAD DISTINCT
File as LatestTwoFiles
RESIDENT File
ORDER BY FileDate DESC;
DROP TABLE File;

LET LatestFile1 = peek('LatestFile',0,'LatestFiles');
LET LatestFile2 = peek('LatestFile',1,'LatestFiles');
DROP TABLE LatestFile;

//-------------------------------

Data:
LOAD
...
RESIDENT FROM [$(LatestFile1).xlsx] (ooxml, explicit labels, table is [Sheet1]);
LOAD
...
RESIDENT FROM [$(LatestFile2).xlsx] (ooxml, explicit labels, table is [Sheet1]);

Hope it helps.

Regards,
Michael

Edit: In fact, I used this approach recently, except I needed only one latest file.

Re: how to Load only the latest files?

Vidit — Mon, 25 Mar 2013 15:03:07 GMT

Looks Good Michael. i will try this

Re: how to Load only the latest files?

Anonymous — Mon, 25 Mar 2013 16:16:00 GMT

Try this. Copy and paste into test qvw application and set folder reference accordingly. Attached in text file also for reference.

set folder = "E:"    // set the folder to the desired file location - leave off everything following \filename.file-extension
;
for each file in filelist('$(folder)\*.xlsx')
FileInfo:
Load
Distinct
FileName() as file_name,
FileBaseName() as file_base_name,
FilePath() as file_path,
FileTime() as file_time
from 
$(file)
(ooxml, embedded labels, table is Sheet1)    // change if needed for different table file format
;
next file;
Qualify *
;
LatestFiles:
First(2)  // set this number to the number of recent files that you want to load
Load *
resident FileInfo
order by file_time DESC
;
Drop Table FileInfo
;
UNQUALIFY *
;
Let source = fieldname(3, 'LatestFiles')
;
Let source_i = fieldvalue('$(source)',1)
;
For i = 1 to NoofRows('LatestFiles')
[File$(i)]:
Load *,
'$(source_i)' as $(source)
from 
$(source_i)
(ooxml, embedded labels, table is Sheet1)    // change if needed for different table file format
;
Let source_i = fieldvalue('$(source)',$(i)+1);
;
next i
exit script
;