topic Re: How to combine all the columns into a single column using tmap. in Talend Studio

How to combine all the columns into a single column using tmap.

Anonymous — Sat, 16 Nov 2024 10:52:55 GMT

Hi guys,
I have a csv file with columns col1,col2,col3,col4,col5.
i created a metadatadelimeted with 5 columns, and i used a tmap to generate single column seperated by comma(,).
I want a regular expression to iterate all the columns and append to the resulted column , like for each column expression like in java.
String finalcol = null;
for each(Column col : allcolumns) {
finalcol = finalcol + "," + col; //requirement1.
col = "mystring_" + col; //requirement2.
}
dont tell newcol = col1+","+col2+","+.........etc.
because number of columns vary in my case.

Re: How to combine all the columns into a single column using tmap.

Anonymous — Tue, 05 Jan 2016 12:24:37 GMT

It sounds like you simply want to read your file using tFileInputFullRow, unless I'm missing something.

Re: How to combine all the columns into a single column using tmap.

Anonymous — Tue, 05 Jan 2016 13:54:47 GMT

It sounds like you simply want to read your file using tFileInputFullRow, unless I'm missing something.

yes tal00000 i tried tFileInputFullRow and aswell as tfileinputdelimited with limit 1, to get the first columns row.
and i want to modify the column names as per the requirement. append some text, change case. and some modifications.

Re: How to combine all the columns into a single column using tmap.

Anonymous — Wed, 06 Jan 2016 02:55:29 GMT

Hi,

and i want to modify the column names as per the requirement. append some text, change case. and some modifications.

Could you please elaborate your case with an example with input and expected output values?
Best regards
Sabrina

Re: How to combine all the columns into a single column using tmap.

Anonymous — Wed, 06 Jan 2016 08:57:32 GMT

Could you please elaborate your case with an example with input and expected output values?

my input csv is.
ID,NAME,NUMBER,ADDRESS
1,john,888888,US
2,joel,999999,UK

in this file extract firstline(columns.) like below.
ID,NAME,NUMBER,ADDRESS
and then from that create output like below.just append like "Comp_"+fieldvariable.
Comp_ID,Comp_NAME,Comp_NUMBER,Comp_ADDRESS

Note: in this case i gave 4 columns(ID,NAME,NUMBER,ADDRESS). But in reality i have different csv files with 100 columns(vary for each file).
they also should do the same operation.using the same job (appending given text for each column).
Hope this information is enough to understand my problem.thanks.