Question

我正在尝试使用PIG从xml文件中读取数据但是输出不完整。

输入文件 -

<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>

我正在使用的代码是：

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);

我得到的输出是：

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

这是不完整的输出。有人可以帮助我找不到的东西吗？

Answer 1

吧！最后使用dataGridView1.Columns[0].AutoSizeMode = System.Windows.Forms.DataGridViewAutoSizeColumnMode.AllCells;使其工作。我正在使用cross，您可以根据需要使用正则表达式。我发现，XPath比正则表达式更简单，更清洁。我想，你也可以看到它。不要忘记用您的XML替换XPath。

XPath方式：

testXML.xml

正则表达方式：

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;

<强>输出：

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;

这不是你期待的吗？ ;）

使用PIG读取XML

1 个答案: