Xapian discuss - Oct 2010 - In-memory databases vs PHP Bindings

I can't quite connect the dots on this, perhaps someone can help.  I'm 
simply trying to create an in-memory database comprising a single document, 
so that I can run a load of queries against it and see if any of them match 
the new document (this is to enable users to have 'subscriptions' to
saved
searches and be alerted every time a new item is published that matches 
their search).

However, I can't work out how to create an in-memory database via the PHP 
bindings.  Here's what I've got so far, using a disk-based index with an
automatic backend (third line from the end is the critical one):

// Find the document in the posts index
$xenq = new XapianEnquire($xdb_posts);
$xenq->set_query(new XapianQuery("UIDpost".$postid));
$xdoc = $xenq->get_mset(0, 1)->begin()->get_document();

// Create a database that just contains the one document
// TODO:AB:20101020: Work out how to build an in-memory Xapian database via 
PHP bindings
$xdb_doc = new
XapianWritableDatabase(PROJROOT.'/tmp/xapian/doc'.$postid,
Xapian::DB_CREATE_OR_OVERWRITE);
$xdb_doc->add_document($xdoc);
$xdb_doc->commit();


Also, FYI, the documentation here seems incomplete:
http://xapian.org/docs/apidoc/html/classXapian_1_1TermIterator.html

I had to inspect the bindings to find the rather useful get_term() method of 
the TermIterator class!  It does mention the use of the * operator to return 
the current term but I can't see how I'd invoke that in PHP.  If the 
get_term method applies in all environments, it ought to be documented I'd 
have thought.

Andrew

Hello,

The documentation describes the Xapian C++ API. In general, it applies to PHP
but there is additional documentation for the PHP bindings here :
http://xapian.org/docs/bindings/php/

It seems that this document is not (yet) linked from the xapian /docs/ page but
it is included with the bindings download.

You will find in this documentation the answers to your questions:
- Use Xapian::inmemory_open() to open an inmemory database (section
"Database Factory Functions") :
  $xdb_doc = Xapian::inmemory_open();

- get_term()is available for TermIterator and ESetIterator.
  (section "Iterator dereferencing")

Hope it helps,

Daniel
> -----Message d'origine-----
> De?: xapian-discuss-bounces at lists.xapian.org [mailto:xapian-discuss-
> bounces at lists.xapian.org] De la part de Andrew Betts
> Envoy??: jeudi 21 octobre 2010 16:33
> ??: xapian-discuss at lists.xapian.org
> Objet?: [Xapian-discuss] In-memory databases vs PHP Bindings
> 
> I can't quite connect the dots on this, perhaps someone can help. 
I'm
> simply trying to create an in-memory database comprising a single document,
> so that I can run a load of queries against it and see if any of them match
> the new document (this is to enable users to have 'subscriptions'
to saved
> searches and be alerted every time a new item is published that matches
> their search).
> 
> However, I can't work out how to create an in-memory database via the
PHP
> bindings.  Here's what I've got so far, using a disk-based index
with an
> automatic backend (third line from the end is the critical one):
> 
> // Find the document in the posts index
> $xenq = new XapianEnquire($xdb_posts);
> $xenq->set_query(new XapianQuery("UIDpost".$postid));
> $xdoc = $xenq->get_mset(0, 1)->begin()->get_document();
> 
> // Create a database that just contains the one document
> // TODO:AB:20101020: Work out how to build an in-memory Xapian database via
> PHP bindings
> $xdb_doc = new
XapianWritableDatabase(PROJROOT.'/tmp/xapian/doc'.$postid,
> Xapian::DB_CREATE_OR_OVERWRITE);
> $xdb_doc->add_document($xdoc);
> $xdb_doc->commit();
> 
> 
> Also, FYI, the documentation here seems incomplete:
> http://xapian.org/docs/apidoc/html/classXapian_1_1TermIterator.html
> 
> I had to inspect the bindings to find the rather useful get_term() method
of
> the TermIterator class!  It does mention the use of the * operator to
return
> the current term but I can't see how I'd invoke that in PHP.  If
the
> get_term method applies in all environments, it ought to be documented
I'd
> have thought.
> 
> Andrew
> 
> 
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> Xapian-discuss mailing list
> Xapian-discuss at lists.xapian.org
> http://lists.xapian.org/mailman/listinfo/xapian-discuss
> 
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Thanks for your help on this.  I was aware of the documentation for the PHP 
bindings' existence, but I obviously didn't go to that page to try and
find
the solution to my query in this case.  Sorry, and thanks for clearing that 
up for me.