create_tstemplate.sgml

postgresql8.3.4源码,开源数据库

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$PostgreSQL: pgsql/doc/src/sgml/ref/create_tstemplate.sgml,v 1.1 2007/08/21 21:08:47 tgl Exp $
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<refentry id="SQL-CREATETSTEMPLATE">
 <refmeta>
  <refentrytitle id="sql-createtstemplate-title">CREATE TEXT SEARCH TEMPLATE</refentrytitle>
  <refmiscinfo>SQL - Language Statements</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname>CREATE TEXT SEARCH TEMPLATE</refname>
  <refpurpose>define a new text search template</refpurpose>
 </refnamediv>

 <indexterm zone="sql-createtstemplate">
  <primary>CREATE TEXT SEARCH TEMPLATE</primary>
 </indexterm>

 <refsynopsisdiv>
<synopsis>
CREATE TEXT SEARCH TEMPLATE <replaceable class="parameter">name</replaceable> (
    [ INIT = <replaceable class="parameter">init_function</replaceable> , ]
    LEXIZE = <replaceable class="parameter">lexize_function</replaceable>
)
</synopsis>
 </refsynopsisdiv>

 <refsect1>
  <title>Description</title>

  <para>
   <command>CREATE TEXT SEARCH TEMPLATE</command> creates a new text search
   template.  Text search templates define the functions that implement
   text search dictionaries.  A template is not useful by itself, but must
   be instantiated as a dictionary to be used.  The dictionary typically
   specifies parameters to be given to the template functions.
  </para>

  <para>
   If a schema name is given then the text search template is created in the
   specified schema.  Otherwise it is created in the current schema.
  </para>

  <para>
   You must be a superuser to use <command>CREATE TEXT SEARCH
   TEMPLATE</command>.  This restriction is made because an erroneous text
   search template definition could confuse or even crash the server.
   The reason for separating templates from dictionaries is that a template
   encapsulates the <quote>unsafe</> aspects of defining a dictionary.
   The parameters that can be set when defining a dictionary are safe for
   unprivileged users to set, and so creating a dictionary need not be a
   privileged operation.
  </para>

  <para>
   Refer to <xref linkend="textsearch"> for further information.
  </para>
 </refsect1>
  
 <refsect1>
  <title>Parameters</title>

  <variablelist>
   <varlistentry>
    <term><replaceable class="parameter">name</replaceable></term>
    <listitem>
     <para>
      The name of the text search template to be created.  The name can be
      schema-qualified.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">init_function</replaceable></term>
    <listitem>
     <para>
      The name of the init function for the template.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">lexize_function</replaceable></term>
    <listitem>
     <para>
      The name of the lexize function for the template.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>

  <para>
   The function names can be schema-qualified if necessary.  Argument types
   are not given, since the argument list for each type of function is
   predetermined.  The lexize function is required, but the init function
   is optional.
  </para>

  <para>
   The arguments can appear in any order, not only the one shown above.
  </para>
 </refsect1>
 
 <refsect1>
  <title>Compatibility</title>

  <para>
   There is no
   <command>CREATE TEXT SEARCH TEMPLATE</command> statement in the SQL
   standard.
  </para>
 </refsect1>

 <refsect1>
  <title>See Also</title>

  <simplelist type="inline">
   <member><xref linkend="sql-altertstemplate" endterm="sql-altertstemplate-title"></member>
   <member><xref linkend="sql-droptstemplate" endterm="sql-droptstemplate-title"></member>
  </simplelist>
 </refsect1>
</refentry>