mirror/postgresql
2
0
Fork 0
mirror of https://git.postgresql.org/git/postgresql.git synced 2024-12-27 08:39:28 +08:00
Code Issues Packages Projects Releases Wiki Activity

Text search documentation word improvements; move configuration section

Browse Source 
to be more logical.
This commit is contained in:
Bruce Momjian 2007-08-29 21:51:45 +00:00
parent bb8f629c7a
commit 09c29cc57b
2 changed files with 18 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
doc/src/sgml/func.sgml
View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.389 2007/08/29 20:37:14 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.390 2007/08/29 21:51:45 momjian Exp $ -->
<chapter id="functions">
<title>Functions and Operators</title>
@ -7552,7 +7552,7 @@ CREATE TYPE rainbow AS ENUM ('red', 'orange', 'yellow', 'green', 'blue', 'purple
<sect1 id="functions-textsearch">
<title>Full Text Search Operators and Functions</title>
<title>Full Text Search Functions and Operators</title>
<para>
This section outlines all the functions and operators that are available

51
doc/src/sgml/textsearch.sgml
View File

@ -231,8 +231,8 @@ SELECT 'fat &amp; cow'::tsquery @@ 'a fat cat sat on a mat and ate a fat rat'::t
is equivalent to <literal>to_tsvector(x) @@ y</literal>.
The form <type>text</type> <literal>@@</literal> <type>text</type>
is equivalent to <literal>to_tsvector(x) @@ plainto_tsquery(y)</literal>.
<xref linkend="functions-textsearch"> contains a full list of full text
search operators and functions.
<xref linkend="functions-textsearch"> contains a complete list of full text
search functions and operators.
</para>
<sect2 id="textsearch-configurations">
@ -250,13 +250,23 @@ SELECT 'fat &amp; cow'::tsquery @@ 'a fat cat sat on a mat and ate a fat rat'::t
This functionality is controlled by <emphasis>configurations</>.
Fortunately, <productname>PostgreSQL</> comes with predefined
configurations for many languages. (<application>psql</>'s <command>\dF</>
shows all predefined configurations.) During installation an appropriate
configuration was selected and <xref
linkend="guc-default-text-search-config"> was set accordingly. If you
need to change it, see <xref linkend="textsearch-tables-multiconfig">.
shows all predefined configurations.)
</para>
<para>
During installation an appropriate configuration was selected and
<xref linkend="guc-default-text-search-config"> was set accordingly
in <filename>postgresql.conf</>. If you are using the same text search
configuration for the entire cluster you can use the value in
<filename>postgresql.conf</>. If using different configurations but
the same text search configuration for an entire database,
use <command>ALTER DATABASE ... SET</>. If not, you must set <xref
linkend="guc-default-text-search-config"> in each session. Many
functions also take an optional configuration name.
</para>
</sect2>
</sect1>
<sect1 id="textsearch-tables">
@ -1781,35 +1791,6 @@ SHOW default_text_search_config;
</sect2>
<sect2 id="textsearch-tables-multiconfig">
<title>Managing Multiple Configurations</title>
<para>
If you are using the same text search configuration for the entire cluster
just set the value in <filename>postgresql.conf</>. If using a single
text search configuration for an entire database, use <command>ALTER
DATABASE ... SET</>.
</para>
<para>
However, if you need to use several text search configurations in the same
database you must be careful to reference the proper text search
configuration. This can be done by either setting
<varname>default_text_search_config</> in each session or supplying the
configuration name in every function call, e.g. to_tsquery('french',
'friend'), to_tsvector('english', col). If you are using an expression
index you must embed the configuration name into the expression index, e.g.:
<programlisting>
CREATE INDEX pgweb_idx ON pgweb USING gin(to_tsvector('french', title || body));
</programlisting>
And for an expression index, specify the configuration name in the
<literal>WHERE</> clause as well so the expression index will be used.
</para>
</sect2>
</sect1>
<sect1 id="textsearch-indexes">