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From Apache Wiki <wikidi...@apache.org>
Subject DataImportHandler reverted to revision 220 on Solr Wiki
Date Wed, 09 Dec 2009 18:35:36 GMT
Dear wiki user,

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The page DataImportHandler has been reverted to revision 220 by JoeSchaefer.
The comment on this change is: testing reverts.
http://wiki.apache.org/solr/DataImportHandler?action=diff&rev1=221&rev2=222

--------------------------------------------------

  <dataConfig>
      <dataSource type="FileDataSource" />
      <document>
-         <entity name="f" processor="FileListEntityProcessor" baseDir="/some/path/tongle
implicit field called 'plainText'. The content is not parsed in any way, however you may add
transformers to manipulate the data within 'plainText' as needed or to create other additional
fields.
+         <entity name="f" processor="FileListEntityProcessor" baseDir="/some/path/to/files"
fileName=".*xml" newerThan="'NOW-3DAYS'" recursive="true" rootEntity="false" dataSource="null">
+             <entity name="x" processor="XPathEntityProcessor" forEach="/the/record/xpath"
url="${f.fileAbsolutePath}">
+                 <field column="full_name" xpath="/field/xpath"/>
+             </entity>
+         </entity>
+     </document>
+ </dataConfig>
+ }}}
+ Do not miss the `rootEntity` attribute. The implicit fields generated by the !FileListEntityProcessor
are `fileAbsolutePath, fileSize, fileLastModified, fileName` and these are available for use
within the entity X as shown above. It should be noted that !FileListEntityProcessor returns
a list of pathnames and that the subsequent entity must use the !FileDataSource to fetch the
files content.
  
- example:
+ === CachedSqlEntityProcessor ===
+ <<Anchor(cached)>>
+ 
+ This is an extension of the !SqlEntityProcessor.  This !EntityProcessor helps reduce the
no: of DB queries executed by caching the rows. It does not help to use it in the root most
entity because only one sql is run for the entity.
+ 
+ Example 1.
  {{{
- <entity processor="PlainTextEntityProcessor" name="x" url="http://abc.com/a.txt" dataSource="data-source-name">
-    <!-- copies the text to a field called 'text' in Solr-->
-   <field column="plainText" name="text"/>
+ <entity name="x" query="select * from x">
+     <entity name="y" query="select * from y where xid=${x.id}" processor="CachedSqlEntityProcessor">
+     </entity>
- </entity>
+ <entity>
  }}}
  
- Ensure that the dataSource is of type !DataSource<Reader> (!FileDataSource, URL!DataSource)
+ The usage is exactly same as the other one. When a query is run the results are stored and
if the same query is run again it is fetched from the cache and returned
  
+ Example 2:
+ {{{
+ <entity name="x" query="select * from x">
+     <entity name="y" query="select * from y" processor="CachedSqlEntityProcessor"  where="xid=x.id">
+     </entity>
+ <entity>
+ }}}
+ 
+ The difference with the previous one is the 'where' attribute. In this case the query fetches
all the rows from the table and stores all the rows in the cache. The magic is in the 'where'
value. The cache stores the values with the 'xid' value in 'y' as the key. The value for 'x.id'
is evaluated every time the entity has to be run and the value is looked up in the cache an
the rows are returned.
+ 
+ In the where the lhs (the part before '=') is the column in y and the rhs (the part after
'=') is the value to be computed for looking up the cache.
+ 
- === LineEntityProcessor ===
+ === PlainTextEntityProcessor ===
- <<Anchor(LineEntityProcessor)>>
+ <<Anchor(plaintext)>>
  <!> [[Solr1.4]]
  
+ This !EntityProcessor reads all content from the data source into an single implicit field
called 'plainText'. The content is not parsed in any way, however you may add transformers
to manipulate the data within 'plainText' as needed or to create other additional fields.
- This !EntityProcessor reads all content from the data source on a line by line basis, a
field called 'rawLine' is returned for each line read. The content is not parsed in any way,
however you may add transformers to manipulate the data within 'rawLine' or to create other
additional fields.
- 
- The lines read can be filtered by two regular expressions '''acceptLineRegex''' and '''omitLineRegex'''.
- This entities additional attributes are:
-  * '''`url`''' : a required attribute that specifies the location of the input file in a
way that is compatible with the configured datasource. If this value is relative and you are
using !FileDataSource or URL!DataSource, it assumed to be relative to '''baseLoc'''.
-  * '''`acceptLineRegex`''' :an optional attribute that if present discards any line which
does not match the regExp.
-  * '''`omitLineRegex`''' : an optional attribute that is applied after any acceptLineRegex
and discards any line which matches this regExp.
- example:
- {{{
- <entity name="jc"
-         processor="LineEntityProcessor"
-         acceptLineRegex="^.*\.xml$"
-         omitLineRegex="/obsolete"
-         url="file:///Volumes/ts/files.lis"
-         rootEntity="false"
-         dataSource="myURIreader1"
-         transformer="RegexTransformer,DateFormatTransformer"
-         >
-    ...
- }}}
- While there are use cases where you might need to create a solr document per line read from
a file, it is expected that in most cases that the lines read will consist of a pathname which
is in turn consumed by another !EntityProcessor
- such as X!PathEntityProcessor.
- 
- == DataSource ==
- <<Anchor(datasource)>>
- A class can extend `org.apache.solr.handler.dataimport.DataSource` . [[http:/%ngle implicit
field called 'plainText'. The content is not parsed in any way, however you may add transformers
to manipulate the data within 'plainText' as needed or to create other additional fields.
  
  example:
  {{{
@@ -1026, +1026 @@

  {{attachment:interactive-dev-dataimporthandler.PNG}}
  
  = Where to find it? =
- DataImportHandler was added to Solr in Solr 1.3. You can either:
+ DataImportHandler is a new addition to Solr. You can either:
-  * Download a build of Solr from [[http://lucene.apache.org/solr/|Solr website]], or
+  * Download a nightly build of Solr from [[http://lucene.apache.org/solr/|Solr website]],
or
   * Use the steps given in Full Import Example to try it out.
  
  For a history of development discussion related to DataImportHandler, please see [[http://issues.apache.org/jira/browse/SOLR-469|SOLR-469]]
in the Solr JIRA.

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