CODEWITHSUNDEEP
xmlxml-parsingapache-pig
Sachin
Sachin

Reputation: 45

Reading XML using PIG

I am trying to read the data from the xml file using PIG but I am getting incomplete output.

Input File- 

<document>   
<url>htp://www.abc.com/</url>
<category>Sports</category>
<usercount>120</usercount>
<reviews>    
<review>good site</review>
<review>This is Avg site</review>
<review>Bad site</review>
</reviews>
</document>

and the code I am using is :

register 'Desktop/piggybank-0.11.0.jar';
A = load 'input3' using org.apache.pig.piggybank.storage.XMLLoader('document') as (data:chararray);


 B = foreach A GENERATE FLATTEN(REGEX_EXTRACT_ALL(data,'(?s)<document>.*?<url>([^>]*?)</url>.*?<category>([^>]*?)</category>.*?<usercount>([^>]*?)</usercount>.*?<reviews>.*?<review>\\s*([^>]*?)\\s*</review>.*?</reviews>.*?</document>')) as (url:chararray,catergory:chararray,usercount:int,review:chararray);

And the output I get is:

(htp://www.abc.com/,Sports,120,good site)

which is incomplete output.Can someone please help on what I am missing?

Upvotes: 3

Views: 7912

Answers (1)

Abhishek
Abhishek

Reputation: 7045

huh!! Finally got it working using cross. I'm using XPath, you can use regex if you want. I find, XPath way to be easier and cleaner than regex. I guess, you can see it too. Don't forget to replace the testXML.xml with your XML.

XPath Way:

DEFINE XPath org.apache.pig.piggybank.evaluation.xml.XPath();
A = LOAD 'testXML.xml' using org.apache.pig.piggybank.storage.XMLLoader('document') as (x:chararray);
B = FOREACH A GENERATE XPath(x, 'document/url'), XPath(x, 'document/category'), XPath(x, 'document/usercount');
C = LOAD 'testXML.xml' using org.apache.pig.piggybank.storage.XMLLoader('review') as (review:chararray);
D = FOREACH C GENERATE XPath(review,'review');
E = cross B,D;
dump E;

Regex Way:

A = LOAD 'testXML.xml' using org.apache.pig.piggybank.storage.XMLLoader('document') as (x:chararray);
B = FOREACH A GENERATE FLATTEN(REGEX_EXTRACT_ALL(x,'(?s)<document>.*?<url>([^>]*?)</url>.*?<category>([^>]*?)</category>.*?<usercount>([^>]*?)</usercount>.*?</document>')) as (url:chararray,catergory:chararray,usercount:int);
C = LOAD 'testXML.xml' using org.apache.pig.piggybank.storage.XMLLoader('review') as (review:chararray);
D = FOREACH C GENERATE FLATTEN(REGEX_EXTRACT_ALL(review,'<review>([^>]*?)</review>'));
E = cross B,D;
dump E;

Output:

(htp://www.abc.com/,Sports,120,Bad site)
(htp://www.abc.com/,Sports,120,This is Avg site)
(htp://www.abc.com/,Sports,120,good site)

Isn't that you were expecting? ;)

Upvotes: 2

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