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Re: database and xml parsers
by Rafael Giacon
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Rate this Message:
Nick Sieger wrote:
> On Thu, Oct 22, 2009 at 9:53 AM, Kevin Tambascio <lists@...>
> wrote:
>> Hi,
>>
>> I'm converting a RoR app to run under JRuby. �Things are going well so
>> far.
>>
>> There are some data-intensive portions to this intranet site, parsing
>> large XML files and populating database (MySQL) tables with the content
>> from the file. �Previously, I was using a native XML parser, which I
>> cannot do in JRuby.
>
> By native, do you mean libxml?
Yes, we were using libxml (expat) previously.
>> I am trying to find a replacement SAX-based XML parser (Hpricot?) that
>> works under JRuby...any suggestions?
>
> On the Ruby side, you could try Nokogiri [1] or REXML + JREXML [2].
> The latter is probably at best a stop-gap.
I believe I tried to install the Nokogiri gem through JRuby, but it had
native elements (the web site you provided a link to says it uses
libxml2). Is there a fully working JRuby solution yet? I found some
posts from Jan 09 that said it was still in progress.
>
>> Another possibility is to re-write the XML parsing and database
>> insertion routines in a Java/JAR package and call that from JRuby. �Is
>> it possible from Java to access the MySQL configuration information that
>> is contained in RoR database.yml? �Or does that information need to be
>> hard-coded in the Java code as well?
>
> A third option you didn't mention would be to drive a Java SAX parser
> from Ruby. You can even extend the DefaultHandler class in Ruby and
> hand it to the Java XML parser:
>
> class RubyHandler < org.xml.sax.helpers.DefaultHandler
> def startElement(namespace, local, qname, attrs)
> end
> # ...
> end
>
> factory = javax.xml.parsers.SAXParserFactory.newInstance
> # configure factory if desired
> parser = factory.newSAXParser
> parser.parse("my/file.xml", RubyHandler.new)
Since I already have the SAX state machine coded up in ruby, using the
Java SAX parser seems like a good idea as well. Less dependencies/gems
to worry about. Thanks so much, I would have never even thought of this
option.
--
Posted via http://www.ruby-forum.com/.
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> On Thu, Oct 22, 2009 at 9:53 AM, Kevin Tambascio <lists@...>
> wrote:
>> Hi,
>>
>> I'm converting a RoR app to run under JRuby. �Things are going well so
>> far.
>>
>> There are some data-intensive portions to this intranet site, parsing
>> large XML files and populating database (MySQL) tables with the content
>> from the file. �Previously, I was using a native XML parser, which I
>> cannot do in JRuby.
>
> By native, do you mean libxml?
Yes, we were using libxml (expat) previously.
>> I am trying to find a replacement SAX-based XML parser (Hpricot?) that
>> works under JRuby...any suggestions?
>
> On the Ruby side, you could try Nokogiri [1] or REXML + JREXML [2].
> The latter is probably at best a stop-gap.
I believe I tried to install the Nokogiri gem through JRuby, but it had
native elements (the web site you provided a link to says it uses
libxml2). Is there a fully working JRuby solution yet? I found some
posts from Jan 09 that said it was still in progress.
>
>> Another possibility is to re-write the XML parsing and database
>> insertion routines in a Java/JAR package and call that from JRuby. �Is
>> it possible from Java to access the MySQL configuration information that
>> is contained in RoR database.yml? �Or does that information need to be
>> hard-coded in the Java code as well?
>
> A third option you didn't mention would be to drive a Java SAX parser
> from Ruby. You can even extend the DefaultHandler class in Ruby and
> hand it to the Java XML parser:
>
> class RubyHandler < org.xml.sax.helpers.DefaultHandler
> def startElement(namespace, local, qname, attrs)
> end
> # ...
> end
>
> factory = javax.xml.parsers.SAXParserFactory.newInstance
> # configure factory if desired
> parser = factory.newSAXParser
> parser.parse("my/file.xml", RubyHandler.new)
Since I already have the SAX state machine coded up in ruby, using the
Java SAX parser seems like a good idea as well. Less dependencies/gems
to worry about. Thanks so much, I would have never even thought of this
option.
--
Posted via http://www.ruby-forum.com/.
---------------------------------------------------------------------
To unsubscribe from this list, please visit:
http://xircles.codehaus.org/manage_email
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