Develop Reference

Split one column to multiple columns

I have one column contains below data . want to split data in to multiple columns using java code . problem i am facing was in string I have double quotes with comma it was falling in to another column. I have to split data as follows(target). Can any one help to fix this ?
I/P:
Column:
abc,"test,data",valid
xyz,"sample,data",invalid
Target:
Col1|Col2|Col3
abc|"test,data"|valid
xyz|"sample_data"|invalid

I highly recommend that you use a library to handle instead doing it yourself.
I guess your data is in CSV format, so you should take a look at common-csv.
You can resolve your problem with simple code:
CSVParser records = CSVParser.parse("abc,\"test,data\",valid", CSVFormat.DEFAULT);
for (CSVRecord csvRecord : records) {
for (String value : csvRecord) {
System.out.println(value);
}
}
Output:
abc
test,data
valid
Read more at https://www.baeldung.com/apache-commons-csv

How can i write values in a column using comma

As per my jmeter test plan,i am saving following information into a csv file using Beanshell PostProcessor
username = vars.get("username");
password = vars.get("password");
f = new FileOutputStream("/path/user_details.csv", true);
p = new PrintStream(f);
this.interpreter.setOut(p);
print(username + "," + password);
f.close()
How can i save those values into a single column using comma (username,password)

Put double quotes around the entire string, so that the comma will be part of a single data item's value, rather than a value separator.
In practice the character you use for the column separator, and the characters you use as a delimiter, are configurable, by a CSV library (which, should really almost always be used instead of trying to get the syntax details right on your own).

Localizing numeric values in excel

BigDecimal myNumber = new BigDecimal(1234.56);
NumberFormat instance = NumberFormat.getInstance(Locale.GERMAN);
String localizedNumber = instance.format(myNumber);
System.out.print("\nformatting " + localizedNumber); o/p ->1.234,56
Till here code works fine but below line gives NumberFormatter exception as given string contains comma in it.
BigDecimal bigDecimal = new BigDecimal(localizedNumber);
I want numeric values to be localized but I cannot return string as putting number as string shows below error in excel
Number in this cell is formatter as text or preceded by an apostrophe
Is there any way by which I can return back numeric value(BigDecimal / Integer / BigInteger etc) in localized format
So that I won't get above error in excel and I can perform filter operations on excel data.
I've also tried new BigDecimalType().valueToString(value, locale); and new BigDecimalType().stringToValue(s, locale); of dynamic jasper reports api.

Happy to answer this question which asked me only and quite surprised that no one replied to this.
Actually we don't have to do anything for number localization in excel export because it's done by our operating system settings automatically.
Go to "Region and Language" -> Format -> Select language/country name -> Apply and check your excel earlier generated in English.
You will see numbers in currently selected country's number format. :)

Parsing a complicated CSV file

I am in the difficult situation now where i need to make a parser to parse a formatted document from tekla to be processed in the database.
so on the .CSV i have this
,SMS-PW-BM31,,1,,,,287.9
,,SMS-PW-BM31,1,H350*175*7*11,SS400,5805,287.9
,------------,--------------,----,---------------,--------,------------,---------
,SMS-PW-BM32,,1,,,,405.8
,,SMSPW-H707,1,H350*175*7*11,SS400,6697,332.2
,,SMSPW-EN12,1,PLT12x175,SS400,500,8.2
,,SMSPW-EN14,1,PLT16x175,SS400,500,11
,------------,--------------,----,---------------,--------,------------,---------
That is the document generated from the tekla software. What i expect from the output is something like this
HEAD-MARK COMPONENT-TYPE QUANTITY PROFILE GRADE LENGTH WEIGHT
SMS-PW-BM31 1 287.9
SMS-PW-BM31 SMS-PW-BM31 1 H350*175*7*11 SS400 5805 287.9
SMS-PW-BM32 1 405.8
SMS-PW-BM32 SMSPW-H707 1 H350*175*7*11 SS400 6697 332.2
SMS-PW-BM32 SMSPW-EN12 1 PLT12X175 SS400 500 8.2
SMS-PW-BM32 SMSPW-EN14 1 PLT16X175 SS400 500 11
How do i start from in Java ? the most complicated thing is distributing the head mark that separated by the '-'

CSV format is quite simple, there is a column delimiter that is a comma(,) and a row delimiter that is a new line(\n). Some columns will be surrounded by quotes(") to contain column data but it looks like you wont have to worry about that given your current file.
Look at String.split and you will find your answer after a bit of pondering it.

How to read a CSV file column wise using hadoop?

i am trying to read a csv file which does not contains coma separated values , these are columns for NASDAQ Stocks, i want to read a particular column, assume (3rd), do not know , how to get the column items. IS there any method to read Column wise data in hadoop? pls help here.
My CSV File Format is:
exchange stock_symbol date stock_price_open stock_price_high stock_price_low stock_price_close stock_volume stock_price_adj_close
NASDAQ ABXA 12/9/2009 2.55 2.77 2.5 2.67 158500 2.67
NASDAQ ABXA 12/8/2009 2.71 2.74 2.52 2.55 131700 2.55
Edited Here:
Column A : exchange
Column B : stock_symbol
Column C : date
Column D : stock_price_open
Column E : stock_price_high
and similarly.
These are Columns and not a comma separated values. i need to read this file as column wise.

In Pig it will look like this:
Q1 = LOAD 'file.csv' USING PigStorage('\t') AS (exchange, stock_symbol, stock_date:double, stock_price_open, stock_price_high, stock_price_low, stock_price_close, stock_volume, stock_price_adj_close);
Q2 = FOREACH Q1 GENERATE stock_date;
DUMP C;

You can try to format excel sheet like, adding columns to a single text by using formula like:
=CONCATENATE(A2,";",B2,";",C2,";"D2,";",E2,";",F2,";",G2,";",H2,";",I2)
and concatenate these columns by your required separator, i have used ;, here. use what you want there to be.