/[pgestraier]/trunk/README.pod
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revision 33 by dpavlin, Wed Jul 6 16:35:51 2005 UTC revision 54 by dpavlin, Thu May 11 10:19:46 2006 UTC
# Line 19  software already installed before you tr Line 19  software already installed before you tr
19    
20  =item *  =item *
21    
22  PostgreSQL (tested with version 7.4.8) with development libraries  PostgreSQL (tested with versions 7.4 and 8.0) with development libraries
23    
24  =item *  =item *
25    
26  Hyper Estraier (tested with versions 0.3.9 and 0.3.10)  Hyper Estraier (tested with various versions, recommended 1.2.4 of newer)
27    
28  =back  =back
29    
# Line 37  working perl installation Line 37  working perl installation
37    
38  =item *  =item *
39    
40  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>
41    
42  =item *  =item *
43    
44  C<trivia.list.gz> from Internet Movie Database in data/ directory  C<trivia.list.gz> from Internet Movie Database in C<data/> directory
45    
46  =item *  =item *
47    
48  database "test" with permissions for current user  PostgreSQL database C<test> with permissions for current user
49    
50    =item *
51    
52    Hyper Estraier node C<trivia> with permissions for C<admin> user.
53    
54  =back  =back
55    
# Line 54  If you have all that, you should be able Line 58  If you have all that, you should be able
58    make    make
59    
60  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
61  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
62  could access it.  could access it.
63    
64  Next, you will have to create test index. You have two options:  =head2 Create sample index using Hyper Estraier perl bindings
   
 =head2 Create index using estcmd  
   
 This will create temporary files on disk and index them using estcmd gather  
   
   cd data  
   make index  
   cd ..  
65    
66  =head2 Create index using Hyper Estraier perl bindings  Perl bindings for Hyper Estraier are available at CPAN:
67    
68  For this, you will have to install perl bindings from  L<http://search.cpan.org/~dpavlin/Search-Estraier/>
69    
 L<http://tokuhirom.dnsalias.org/~tokuhirom/archive/hyper_estraier_wrappers-0.0.6.tar.gz>  
70    
71  If you installed bindings as documented in README file, you can issue  After installing C<Search::Estraier> you can create index using following commands:
 following commands to create index about three times faster than using  
 estcmd:  
72    
73    cd data    cd data
74    make perl    make index
75    cd ..    cd ..
76    
77  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
78    
79    make test    make test
80    
81  See also included file test.sql for more examples of usage.  See also included file C<test.sql> for more examples of usage.
82    
83    =head1 Usage of pgest from SQL
84    
85    C<pgest> PostgreSQL function tries to mimic usage of normal database tables (with support for attribute filtering, limit and offset) in following way:
86    
87            SELECT
88                    -- columns to return (defined later)
89                    id,title,size
90            FROM pgest(
91                    -- node URI, login, password and depth of search
92                    'http://localhost:1978/node/trivia', 'admin', 'admin', 42,
93                    -- query
94                    'blade runner',
95                    -- additional attributes, use NULL or '' to disable
96                    -- multiple attributes conditions can be separated by {{!}}
97                    '@title ISTRINC blade',
98                    -- order results by
99                    '@title STRA',
100                    -- limit, use NULL or 0 to disable
101                    null,
102                    -- offset, use NULL or 0 to disable
103                    null,
104                    -- attributes to return as columns
105                    ARRAY['@id','@title','@size']
106            ) AS (
107                    -- specify names and types of returned attributes
108                    id text, title text, size text
109            );
110    
111    You should note that Hyper Estraier uses UTF-8 encoding, while your
112    PostgreSQL installation might use different encoding. To fix that, use
113    C<convert> function in PostgreSQL to convert encodings.
114    
115    =head2 Using index via C<estmaster> server process
116    
117    This is default and recommended way to use C<pgest> functionality. In this
118    case, C<pgest> will use node API and access index through C<estmaster>
119    process which should be running on (local or remote) machine.
120    
121    This will remove database opening overhead, at a cost of (small) additional network
122    traffic. However, you can have Hyper Estraier C<estmaster> process running on
123    different machine or update index while doing searches, so benefits of this
124    approach are obvious.
125    
126    =head2 Accessing database directly
127    
128    B<Please note that direct access to database is depreciated.> As such, it's
129    not stated in example, and it's kept just for backward compatibility, but it
130    will probably be removed in future versions of C<pgest>.
131    
132    If you want to access database directly (without running C<estmaster> process), you
133    have to replace node URI, login, password and depth with full path to database file.
134    
135    Have in mind that C<postgres> user under which PostgreSQL is running must
136    have read permission on Hyper Estraier database files.
137    
138    This will work a bit faster on really small indexes. However, when your
139    index grows bigger, you might consider using node API to remove overhead of
140    database opening on each query.
141    
142  =head1 Who wrote this?  =head1 Who wrote this?
143    
144  Hyper Estraier is written by Mikio Hirabayashi.  Hyper Estraier is written by Mikio Hirabayashi.
145    
146    Perl bindings for Hyper Estraier are written by MATSUNO Tokuhiro.
147    
148  PostgreSQL is written by hackers calling themselves PostgreSQL Global  PostgreSQL is written by hackers calling themselves PostgreSQL Global
149  Development Group.  Development Group.
150    
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