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hidden in ability to join results from full text index and structured data |
hidden in ability to join results from full text index and structured data |
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in RDBMS. |
in RDBMS. |
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For simple real-life example which address problem |
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I<where like '%foo%' is slow> |
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see L<Tutorial>. |
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=head1 How to install |
=head1 How to install |
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Installation should be simple. However, you will have to have following |
Installation should be simple. However, you will have to have following |
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=item * |
=item * |
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PostgreSQL (tested with version 7.4.8) with development libraries |
PostgreSQL (tested with versions 7.4 and 8.0) with development libraries |
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=item * |
=item * |
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Hyper Estraier (tested with versions 0.3.9 and 0.3.10) |
Hyper Estraier (tested with various versions, recommended 1.2.4 of newer) |
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=back |
=back |
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=item * |
=item * |
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perl modules C<DBI>, C<DBD::Pg>, C<Test::More> and optionally C<HyperEstraier> |
perl modules C<DBI>, C<DBD::Pg>, C<Test::More> and optionally C<Search::Estraier> |
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=item * |
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C<trivia.list.gz> from Internet Movie Database in C<data/> directory |
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=item * |
=item * |
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C<trivia.list.gz> from Internet Movie Database in data/ directory |
PostgreSQL database C<test> with permissions for current user |
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=item * |
=item * |
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database "test" with permissions for current user |
Hyper Estraier C<estmaster> running with permissions for C<admin> user |
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to create C<trivia> node. |
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=back |
=back |
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make |
make |
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and see sample results. You will be asked your password once (via sudo) to |
and see sample results. You will be asked your password once (via sudo) to |
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install pgest.so shared library in system-wide location so that PostgreSQL |
install C<pgest.so> shared library in system-wide location so that PostgreSQL |
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could access it. |
could access it. |
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Next, you will have to create test index. You have two options: |
=head2 Create sample index using Hyper Estraier perl bindings |
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=head2 Create index using estcmd |
Perl bindings for Hyper Estraier are available at CPAN: |
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This will create temporary files on disk and index them using estcmd gather |
L<http://search.cpan.org/~dpavlin/Search-Estraier/> |
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cd data |
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make index |
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cd .. |
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B<Warning:> this method is incomplete and won't create node index needed |
After installing C<Search::Estraier> you can create index using following commands: |
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to run last examples in C<test.sql> correctly. Solution is simple: either |
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symlink your newly created index to Hyper Estraier C<_node> directory or |
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create node and fill re-create index using C<estcall>. |
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=head2 Create index using Hyper Estraier perl bindings |
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For this, you will have to install perl bindings from |
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L<http://hyperestraier.sourceforge.net/binding/> |
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If you installed bindings as documented in README file, you can use |
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perl binding to create index about three times faster. However, you will |
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fist need to create node I<trivia> using Hyper Estraier's administration |
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interface at L<http://localhost:1978/masterui>. You will also need user |
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C<admin> with password C<admin> because those values are hard-coded in |
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C<indexer.pl>. If you want to use different user on index name, feel |
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free to change script. |
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cd data |
cd data |
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make perl |
make index |
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cd .. |
cd .. |
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To run tests (which require that you have estcmd in your $PATH) issue |
To run tests (which require that you have estcmd in your $PATH) issue |
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make test |
make test |
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See also included file test.sql for more examples of usage. |
See also included file C<test.sql> for more examples of usage. |
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=head1 Usage of pgest from SQL |
=head1 Usage of pgest from SQL |
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C<pgest> PostgreSQL function has two different prototypes (number of arguments) depending on usage. |
C<pgest> PostgreSQL function tries to mimic usage of normal database tables (with support for attribute filtering, limit and offset) in following way: |
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SELECT |
SELECT |
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-- columns to return (defined later) |
-- columns to return (defined later) |
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id,title,size |
id,title,size |
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FROM pgest( |
FROM pgest( |
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-- path to index OR URL to node, user-name and password |
-- node URI, login, password and depth of search |
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-- you will need JUST ONE of following two lines, depending |
'http://localhost:1978/node/trivia', 'admin', 'admin', 42, |
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-- on your usage described below |
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'/full/path/to/casket', |
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'http://localhost:1978/node/trivia', 'admin', 'admin', |
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-- query |
-- query |
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'blade runner', |
'blade runner', |
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-- additional attributes, use NULL or '' to disable |
-- additional attributes, use NULL or '' to disable |
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id text, title text, size text |
id text, title text, size text |
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); |
); |
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You should note that Hyper Estraier uses UTF-8 encoding, while your |
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PostgreSQL installation might use different encoding. To fix that, use |
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C<convert> function in PostgreSQL to convert encodings. |
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=head2 Using index via C<estmaster> server process |
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This is default and recommended way to use C<pgest> functionality. In this |
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case, C<pgest> will use node API and access index through C<estmaster> |
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process which should be running on (local or remote) machine. |
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This will remove database opening overhead, at a cost of (small) additional network |
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traffic. However, you can have Hyper Estraier C<estmaster> process running on |
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different machine or update index while doing searches, so benefits of this |
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approach are obvious. |
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=head2 Accessing database directly |
=head2 Accessing database directly |
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If you want to access database directly (without running C<estmaster> process), first argument is full path to database file. |
B<Please note that direct access to database is depreciated.> As such, it's |
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not stated in example, and it's kept just for backward compatibility, but it |
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will probably be removed in future versions of C<pgest>. |
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If you want to access database directly (without running C<estmaster> process), you |
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have to replace node URI, login, password and depth with full path to database file. |
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Have in mind that C<postgres> user under which PostgreSQL is running must |
Have in mind that C<postgres> user under which PostgreSQL is running must |
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have read permission on Hyper Estraier database files. |
have read permission on Hyper Estraier database files. |
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index grows bigger, you might consider using node API to remove overhead of |
index grows bigger, you might consider using node API to remove overhead of |
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database opening on each query. |
database opening on each query. |
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=head2 Using index via C<estmaster> server process |
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If first argument is URL to node (like C<http://localhost:1978/node/trivia>) |
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and there are two additional parameters (user-name and password) after it, |
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C<pgest> will use node API and access index through C<estmaster> process which should be running on (local or remote) machine. |
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This will remove database opening overhead, at a cost of additional network |
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traffic. However, you can have Hyper Estraier C<estmaster> process running on |
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different machine or update index while doing searches, so benefits of this |
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approach are obvious. |
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B<Note:> Currently, there is no support to search more than one index (depth |
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of search is always 0). This will be fixed. |
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=head1 Who wrote this? |
=head1 Who wrote this? |
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149 |
Hyper Estraier is written by Mikio Hirabayashi. |
Hyper Estraier is written by Mikio Hirabayashi. |
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Perl bindings for Hyper Estraier are written by MATSUNO Tokuhiro. |
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PostgreSQL is written by hackers calling themselves PostgreSQL Global |
PostgreSQL is written by hackers calling themselves PostgreSQL Global |
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Development Group. |
Development Group. |
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This small C function is written by Dobrica Pavlinusic, dpavlin@rot13.org. |
This small C function is written by L<Dobrica Pavlinusic|http://www.rot13.org/~dpavlin/>, dpavlin@rot13.org. |