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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:19:15 +0000 |
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| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:19:15 +0000 |
| commit | 6eb9c5a5657d1fe77b55cc261450f3538d35a94d (patch) | |
| tree | 657d8194422a5daccecfd42d654b8a245ef7b4c8 /doc/src/sgml/html/dict-xsyn.html | |
| parent | Initial commit. (diff) | |
| download | postgresql-13-upstream.tar.xz postgresql-13-upstream.zip | |
Adding upstream version 13.4.upstream/13.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'doc/src/sgml/html/dict-xsyn.html')
| -rw-r--r-- | doc/src/sgml/html/dict-xsyn.html | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/doc/src/sgml/html/dict-xsyn.html b/doc/src/sgml/html/dict-xsyn.html new file mode 100644 index 0000000..4c8a68c --- /dev/null +++ b/doc/src/sgml/html/dict-xsyn.html @@ -0,0 +1,97 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>F.12. dict_xsyn</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="prev" href="dict-int.html" title="F.11. dict_int" /><link rel="next" href="earthdistance.html" title="F.13. earthdistance" /></head><body id="docContent" class="container-fluid col-10"><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">F.12. dict_xsyn</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="dict-int.html" title="F.11. dict_int">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="contrib.html" title="Appendix F. Additional Supplied Modules">Up</a></td><th width="60%" align="center">Appendix F. Additional Supplied Modules</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 13.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="earthdistance.html" title="F.13. earthdistance">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="DICT-XSYN"><div class="titlepage"><div><div><h2 class="title" style="clear: both">F.12. dict_xsyn</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="sect2"><a href="dict-xsyn.html#id-1.11.7.21.4">F.12.1. Configuration</a></span></dt><dt><span class="sect2"><a href="dict-xsyn.html#id-1.11.7.21.5">F.12.2. Usage</a></span></dt></dl></div><a id="id-1.11.7.21.2" class="indexterm"></a><p> + <code class="filename">dict_xsyn</code> (Extended Synonym Dictionary) is an example of an + add-on dictionary template for full-text search. This dictionary type + replaces words with groups of their synonyms, and so makes it possible to + search for a word using any of its synonyms. + </p><div class="sect2" id="id-1.11.7.21.4"><div class="titlepage"><div><div><h3 class="title">F.12.1. Configuration</h3></div></div></div><p> + A <code class="literal">dict_xsyn</code> dictionary accepts the following options: + </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + <code class="literal">matchorig</code> controls whether the original word is accepted by + the dictionary. Default is <code class="literal">true</code>. + </p></li><li class="listitem"><p> + <code class="literal">matchsynonyms</code> controls whether the synonyms are + accepted by the dictionary. Default is <code class="literal">false</code>. + </p></li><li class="listitem"><p> + <code class="literal">keeporig</code> controls whether the original word is included in + the dictionary's output. Default is <code class="literal">true</code>. + </p></li><li class="listitem"><p> + <code class="literal">keepsynonyms</code> controls whether the synonyms are included in + the dictionary's output. Default is <code class="literal">true</code>. + </p></li><li class="listitem"><p> + <code class="literal">rules</code> is the base name of the file containing the list of + synonyms. This file must be stored in + <code class="filename">$SHAREDIR/tsearch_data/</code> (where <code class="literal">$SHAREDIR</code> means + the <span class="productname">PostgreSQL</span> installation's shared-data directory). + Its name must end in <code class="literal">.rules</code> (which is not to be included in + the <code class="literal">rules</code> parameter). + </p></li></ul></div><p> + The rules file has the following format: + </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Each line represents a group of synonyms for a single word, which is + given first on the line. Synonyms are separated by whitespace, thus: +</p><pre class="programlisting"> +word syn1 syn2 syn3 +</pre><p> + </p></li><li class="listitem"><p> + The sharp (<code class="literal">#</code>) sign is a comment delimiter. It may appear at + any position in a line. The rest of the line will be skipped. + </p></li></ul></div><p> + Look at <code class="filename">xsyn_sample.rules</code>, which is installed in + <code class="filename">$SHAREDIR/tsearch_data/</code>, for an example. + </p></div><div class="sect2" id="id-1.11.7.21.5"><div class="titlepage"><div><div><h3 class="title">F.12.2. Usage</h3></div></div></div><p> + Installing the <code class="literal">dict_xsyn</code> extension creates a text search + template <code class="literal">xsyn_template</code> and a dictionary <code class="literal">xsyn</code> + based on it, with default parameters. You can alter the + parameters, for example + +</p><pre class="programlisting"> +mydb# ALTER TEXT SEARCH DICTIONARY xsyn (RULES='my_rules', KEEPORIG=false); +ALTER TEXT SEARCH DICTIONARY +</pre><p> + + or create new dictionaries based on the template. + </p><p> + To test the dictionary, you can try + +</p><pre class="programlisting"> +mydb=# SELECT ts_lexize('xsyn', 'word'); + ts_lexize +----------------------- + {syn1,syn2,syn3} + +mydb# ALTER TEXT SEARCH DICTIONARY xsyn (RULES='my_rules', KEEPORIG=true); +ALTER TEXT SEARCH DICTIONARY + +mydb=# SELECT ts_lexize('xsyn', 'word'); + ts_lexize +----------------------- + {word,syn1,syn2,syn3} + +mydb# ALTER TEXT SEARCH DICTIONARY xsyn (RULES='my_rules', KEEPORIG=false, MATCHSYNONYMS=true); +ALTER TEXT SEARCH DICTIONARY + +mydb=# SELECT ts_lexize('xsyn', 'syn1'); + ts_lexize +----------------------- + {syn1,syn2,syn3} + +mydb# ALTER TEXT SEARCH DICTIONARY xsyn (RULES='my_rules', KEEPORIG=true, MATCHORIG=false, KEEPSYNONYMS=false); +ALTER TEXT SEARCH DICTIONARY + +mydb=# SELECT ts_lexize('xsyn', 'syn1'); + ts_lexize +----------------------- + {word} +</pre><p> + + Real-world usage will involve including it in a text search + configuration as described in <a class="xref" href="textsearch.html" title="Chapter 12. Full Text Search">Chapter 12</a>. + That might look like this: + +</p><pre class="programlisting"> +ALTER TEXT SEARCH CONFIGURATION english + ALTER MAPPING FOR word, asciiword WITH xsyn, english_stem; +</pre><p> + + </p></div></div><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navfooter"><hr></hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="dict-int.html" title="F.11. dict_int">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="contrib.html" title="Appendix F. 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