topic Re: Cannot read text file. in QlikView

Cannot read text file.

Sokkorn — Thu, 24 May 2012 06:47:18 GMT

Dear values visitors,

I got an issue with (.dat) file. For each file store like this:

{1=A    2=B    3=C}{1=X    2=Y    
3=Z}{1=N    4=M    5=O}{1=K    6=P    10=R}

This is mean that one record seperate by {} and have no specific enter line.

So the result after QlikView read is like below:

1=A    2=B    3=C
1=X    2=Y    3=Z
1=N    4=M    5=O
1=K    6=P    10=R

How can I achieve this?

Very much appreciate for your idea.

Enclosure: DATA.dat (Open with Notepad to see content)

Regards,

Sokkorn

Re: Cannot read text file.

Sokkorn — Thu, 24 May 2012 08:26:26 GMT

Hi,

Any suggestion on my case?

Regards,

Sokkorn

Cannot read text file.

flipside — Thu, 24 May 2012 08:37:54 GMT

Hi Sokkorn,

Two solutions come to mind. One would be to feed your .dat file through a vbs routine to read the data between the { and } characters line by line.

The second option is to loop through the rows in the load script and rebuild the data as necessary. Something like this would work ...

DataRowTmp:
LOAD RecNo() as DataRecRef, @1 as Data
FROM
[DATA.dat]
(txt, codepage is 1252, no labels, delimiter is \x7f, no quotes); // using a delimiter you know doesn't exist

DataRows: //Need to force the order of the table
NoConcatenate LOAD DataRecRef, Data
resident DataRowTmp order by DataRecRef;

DROP TABLE DataRowTmp;

LET vRowBuilder = '';

For r = 1 to NoOfRows('DataRows')

LET vRow = peek('Data',$(r),'DataRows');

//let x = msgbox('$(vRow)'); //testing
If vRow = '}' then

RealData:
LOAD '$(r)' as RecRef, '$(vRowBuilder)' as RealRow
resident DataRows;

LET vRowBuilder = '';

ELSE

LET vRowBuilder = '$(vRowBuilder)' & ' ' & '$(vRow)'; //not sure on tab ascii character needed

ENDIF

Next;

It will need some tweaking to make it work exactly but should give you a start.

flipside

Cannot read text file.

Thu, 24 May 2012 08:41:02 GMT

HI,

just to understand.

Do you want a result table with a record like this:

A B C X Y Z N M O K P R

1 2 3 1 2 3 1 4 5 1 6 10

Re: Cannot read text file.

rbecher — Thu, 24 May 2012 08:53:51 GMT

Hi Sokkorn,

I hope I understand it right, that's my proposal:

temp_data:

LOAD rec, SubField(line, '=', 1) as field, SubField(line, '=', 2) as value;

LOAD if(RecNo()>1 and delim='', peek(rec), autonumber(if(delim='{', RecNo()))) as rec, line, delim;

LOAD trim(left(@1:n, 1)) as delim, @1:n as line

FROM DATA.dat

(fix, codepage is 1252);

data:

generic load * resident temp_data where field <> '{' and field <> '}';

-----

There are also some examples here to consolidate the huge amount of tables of the generic load ..

- Ralf

Re: Cannot read text file.

Sokkorn — Thu, 24 May 2012 09:00:57 GMT

Hi All,

Many thank for your prompt response. Let me test your solution after back to office.

Regards,

Sokkorn

Re: Cannot read text file.

Thu, 24 May 2012 09:39:57 GMT

Hi Sokkorn,

Please find the attached file.

While it seems that it does give the desired results.

One strange thing I am seeing is that it is giving line breaks with every new data value, if I use any delimiter else than tab.

But anyways this seems to solve your case.

Please find the attached file.

Thanks

Ashutosh Paliwal

Cannot read text file.

Sokkorn — Thu, 24 May 2012 10:16:16 GMT

Hi Ralf,

Your solution is awesome. Is it posible to merge all tables into one? So that I can easy to store data into one QVD.

Copy: flipside: Your solution is working for small amount of data. Totally I have 10GB of data source. When apply your solution, then my pc getting stuck.

Copy: giampiero: Not really. You can download Ralf's file to see data store.

Copy: Ashutosh: Your solution working find but pc performance used memory arount 680,000K while Ralf's solution use only 350,000K for 3 million records.

Again, Ralf's solution is the best for me. But I still need your help to combine all those generic load into one table only. The reason is easy to store into QVD file.

By the way, still say many thanks for your kind support on my case.

Regards,

Sokkorn

Re: Cannot read text file.

rbecher — Thu, 24 May 2012 10:49:21 GMT

Btw, I have extended the example with the table consolidation (adjusted from Rob Wunderlich's example).

- Ralf

Cannot read text file.

rbecher — Thu, 24 May 2012 19:02:04 GMT

Sokkorn,

did you see my second upload "data2.qvw" above? This is consolidated into one table at the end..

- Ralf

Cannot read text file.

flipside — Thu, 24 May 2012 20:37:27 GMT

Hi Sokkorn,

Yes, my solution of looping over data might not be the best for large datasets!! I did find later that the second table load (DataRows) was not needed to force the row order. Taking that out and changing the original table name to DataRows would make it run faster.

flipside

Re: Cannot read text file.

Thu, 24 May 2012 21:47:53 GMT

Here's a slightly different approach to collapsing the "generic" tables. With the current data I can't measure a LOAD time but included the calculation in the QVW for use when it's run against the entire dataset.

Re: Cannot read text file.

Sokkorn — Fri, 25 May 2012 01:01:47 GMT

Hi Ralf,

Many thanks for your solution. It working fine.

Copy: Dave: I try your file with 3 million records and it spend around 3 minute. Actually I have data more than billion records. By the way your solution is good for me to get new idea.

Thanks once again to all of you. You are my best friend .

Sharing culture!!!!

Cheer!!!!!!

Sokkorn