154 lines
4.2 KiB
Plaintext
154 lines
4.2 KiB
Plaintext
<!--
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doc/src/sgml/ref/create_tsparser.sgml
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PostgreSQL documentation
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-->
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<refentry id="sql-createtsparser">
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<indexterm zone="sql-createtsparser">
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<primary>CREATE TEXT SEARCH PARSER</primary>
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</indexterm>
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<refmeta>
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<refentrytitle>CREATE TEXT SEARCH PARSER</refentrytitle>
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<manvolnum>7</manvolnum>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>CREATE TEXT SEARCH PARSER</refname>
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<refpurpose>define a new text search parser</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<synopsis>
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CREATE TEXT SEARCH PARSER <replaceable class="parameter">name</replaceable> (
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START = <replaceable class="parameter">start_function</replaceable> ,
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GETTOKEN = <replaceable class="parameter">gettoken_function</replaceable> ,
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END = <replaceable class="parameter">end_function</replaceable> ,
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LEXTYPES = <replaceable class="parameter">lextypes_function</replaceable>
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[, HEADLINE = <replaceable class="parameter">headline_function</replaceable> ]
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)
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</synopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<command>CREATE TEXT SEARCH PARSER</command> creates a new text search
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parser. A text search parser defines a method for splitting a text
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string into tokens and assigning types (categories) to the tokens.
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A parser is not particularly useful by itself, but must be bound into a
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text search configuration along with some text search dictionaries
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to be used for searching.
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</para>
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<para>
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If a schema name is given then the text search parser is created in the
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specified schema. Otherwise it is created in the current schema.
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</para>
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<para>
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You must be a superuser to use <command>CREATE TEXT SEARCH PARSER</command>.
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(This restriction is made because an erroneous text search parser
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definition could confuse or even crash the server.)
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</para>
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<para>
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Refer to <xref linkend="textsearch"/> for further information.
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</para>
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</refsect1>
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<refsect1>
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<title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><replaceable class="parameter">name</replaceable></term>
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<listitem>
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<para>
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The name of the text search parser to be created. The name can be
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schema-qualified.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">start_function</replaceable></term>
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<listitem>
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<para>
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The name of the start function for the parser.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">gettoken_function</replaceable></term>
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<listitem>
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<para>
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The name of the get-next-token function for the parser.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">end_function</replaceable></term>
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<listitem>
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<para>
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The name of the end function for the parser.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">lextypes_function</replaceable></term>
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<listitem>
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<para>
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The name of the lextypes function for the parser (a function that
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returns information about the set of token types it produces).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">headline_function</replaceable></term>
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<listitem>
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<para>
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The name of the headline function for the parser (a function that
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summarizes a set of tokens).
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>
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The function names can be schema-qualified if necessary. Argument types
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are not given, since the argument list for each type of function is
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predetermined. All except the headline function are required.
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</para>
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<para>
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The arguments can appear in any order, not only the one shown above.
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</para>
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</refsect1>
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<refsect1>
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<title>Compatibility</title>
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<para>
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There is no
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<command>CREATE TEXT SEARCH PARSER</command> statement in the SQL
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standard.
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</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<simplelist type="inline">
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<member><xref linkend="sql-altertsparser"/></member>
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<member><xref linkend="sql-droptsparser"/></member>
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</simplelist>
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</refsect1>
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</refentry>
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