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Postgres FD Implementation
Commit 8d25d5c5 authored by Tatsuo Ishii's avatar Tatsuo Ishii
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Add CREATE CONVERSION/DROP CONVERSOION reference manual

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doc/src/sgml/ref/allfiles.sgml
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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/allfiles.sgml,v 1.41 2002/07/18 23:11:27 petere Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/allfiles.sgml,v 1.42 2002/07/22 08:57:15 ishii Exp $
PostgreSQL documentation
Complete list of usable sgml source files in this directory.
-->
......@@ -53,6 +53,7 @@ Complete list of usable sgml source files in this directory.
<!entity createAggregate system "create_aggregate.sgml">
<!entity createCast system "create_cast.sgml">
<!entity createConstraint system "create_constraint.sgml">
<!entity createConversion system "create_conversion.sgml">
<!entity createDatabase system "create_database.sgml">
<!entity createDomain system "create_domain.sgml">
<!entity createFunction system "create_function.sgml">
......@@ -73,6 +74,7 @@ Complete list of usable sgml source files in this directory.
<!entity delete system "delete.sgml">
<!entity dropAggregate system "drop_aggregate.sgml">
<!entity dropCast system "drop_cast.sgml">
<!entity dropConversion system "drop_conversion.sgml">
<!entity dropDatabase system "drop_database.sgml">
<!entity dropDomain system "drop_domain.sgml">
<!entity dropFunction system "drop_function.sgml">
......
doc/src/sgml/ref/create_conversion.sgml 0 → 100644
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<!-- $Header: /cvsroot/pgsql/doc/src/sgml/ref/create_conversion.sgml,v 1.1 2002/07/22 08:57:15 ishii Exp $ -->
<refentry id="SQL-CREATECONVERSION">
<refmeta>
<refentrytitle id="SQL-CREATECONVERSION-TITLE">CREATE CONVERSION</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>CREATE CONVERSION</refname>
<refpurpose>define a user-defined conversion</refpurpose>
</refnamediv>
<refsynopsisdiv>
<synopsis>
CREATE [DEFAULT] CONVERSION <replaceable>conversion_name</replaceable>
FOR <replaceable>source_encoding</replaceable>
TO <replaceable>dest_encoding</replaceable> FROM <replaceable>funcname</replaceable>
</synopsis>
</refsynopsisdiv>
<refsect1 id="sql-createconversion-description">
<title>Description</title>
<para>
<command>CREATE CONVERSION</command> defines a new encoding
conversion. There are two kinds of conversions. A default
conversion is used for an automatic encoding conversion between
frontend and backend. There should be only one default conversion
for source/destination encodings pair in a schema. None default
conversion never be used for the automatic conversion. Instead it
can be used for CONVERT() function.
</para>
<para>
To be able to create a conversion, you must have the execute right
on the function and the usage right on the schema the function
belongs to.
</para>
<variablelist>
<title>Parameters</title>
<varlistentry>
<term><literal>DEFAULT</literal></term>
<listitem>
<para>
The <literal>DEFAULT</> clause indicates that this conversion
is the default for this particular source to destination
encoding. There should be only one default encoding in a schema
for the encoding pair. A default encoding can be used for not
only CONVERT() function, but also for the automatic encoding
conversion between frontend and backend. For this purpose, two
conversions, from encoding A to B AND encoding B to A, must be
defined.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable>conversion_name</replaceable></term>
<listitem>
<para>
The name of the conversion. The conversion name may be
schema-qualified. If it is not, a conversion is defined in the
current schema. The conversion name must be unique with in a
schema.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable>source_encoding</replaceable></term>
<listitem>
<para>
The source encoding name.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable>source_encoding</replaceable></term>
<listitem>
<para>
The destination encoding name.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable>funcname</replaceable></term>
<listitem>
<para>
The function used to perform the conversion. The function name may
be schema-qualified. If it is not, the function will be looked
up in the path.
</para>
<para>
The function must have following signature:
<programlisting>
conv_proc(
INTEGER, -- source encoding id
INTEGER, -- destination encoding id
OPAQUE, -- source string (null terminated C string)
OPAQUE, -- destination string (null terminated C string)
INTEGER -- source string length
) returns INTEGER; -- dummy. returns nothing, actually.
</programlisting>
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="sql-createconversion-notes">
<title>Notes</title>
<para>
Use <command>DROP CONVERSION</command> to remove user-defined conversions.
</para>
<para>
The privileges required to create a conversion may be changed in a future
release.
</para>
</refsect1>
<refsect1 id="sql-createconversion-examples">
<title>Examples</title>
<para>
To create a conversion from encoding UNICODE to LATIN1 using myfunc:
<programlisting>
CREATE CONVERSION myconv FOR 'UNICODE' TO 'LATIN1' FROM myfunc;
</programlisting>
</para>
</refsect1>
<refsect1 id="sql-createconversion-compat">
<title>Compatibility</title>
<para>
<command>CREATE CONVERSION</command>
is a <productname>PostgreSQL</productname> extension.
There is no <command>CREATE OPERATOR</command>
statement in <acronym>SQL99</acronym>.
</para>
</refsect1>
<refsect1 id="sql-createconversion-seealso">
<title>See Also</title>
<para>
<xref linkend="sql-createfunction" endterm="sql-createfunction-title">,
<xref linkend="sql-dropconversion" endterm="sql-dropconversion-title">,
<citetitle>PostgreSQL Programmer's Guide</citetitle>
</para>
</refsect1>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode:sgml
sgml-omittag:nil
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
sgml-parent-document:nil
sgml-default-dtd-file:"../reference.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:("/usr/lib/sgml/catalog")
sgml-local-ecat-files:nil
End:
-->
doc/src/sgml/ref/drop_conversion.sgml 0 → 100644
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<!-- $Header: /cvsroot/pgsql/doc/src/sgml/ref/drop_conversion.sgml,v 1.1 2002/07/22 08:57:15 ishii Exp $ -->
<refentry id="SQL-DROPCONVERSION">
<refmeta>
<refentrytitle id="SQL-DROPCONVERSION-TITLE">DROP CONVERSION</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>DROP CONVERSION</refname>
<refpurpose>remove a user-defined conversion</refpurpose>
</refnamediv>
<refsynopsisdiv>
<synopsis>
DROP CONVERSION <replaceable>conversion_name</replaceable>
[ CASCADE | RESTRICT ]
</synopsis>
</refsynopsisdiv>
<refsect1 id="sql-dropconversion-description">
<title>Description</title>
<para>
<command>DROP CONVERSION</command> removes a previously defined conversion.
</para>
<para>
To be able to drop a conversion, you must own the conversion.
</para>
<variablelist>
<title>Parameters</title>
<varlistentry>
<term><replaceable>conversion_name</replaceable></term>
<listitem>
<para>
The name of the conversion. The conversion name may be
schema-qualified.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>CASCADE</literal></term>
<term><literal>RESTRICT</literal></term>
<listitem>
<para>
These key words do not have any effect, since there are no
dependencies on conversions.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="sql-dropconversion-notes">
<title>Notes</title>
<para>
Use <command>CREATE CONVERSION</command> to create user-defined conversions.
</para>
<para>
The privileges required to drop a conversion may be changed in a future
release.
</para>
</refsect1>
<refsect1 id="sql-dropconversion-examples">
<title>Examples</title>
<para>
To drop the conversion named myname:
<programlisting>
DROP CONVERSION myname;
</programlisting>
</para>
</refsect1>
<refsect1 id="sql-dropconversion-compat">
<title>Compatibility</title>
<para>
<command>DROP CONVERSION</command>
is a <productname>PostgreSQL</productname> extension.
There is no <command>DROP OPERATOR</command>
statement in <acronym>SQL99</acronym>.
</para>
</refsect1>
<refsect1 id="sql-dropconversion-seealso">
<title>See Also</title>
<para>
<xref linkend="sql-createconversion" endterm="sql-createconversion-title">
</para>
</refsect1>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode:sgml
sgml-omittag:nil
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
sgml-parent-document:nil
sgml-default-dtd-file:"../reference.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:("/usr/lib/sgml/catalog")
sgml-local-ecat-files:nil
End:
-->
doc/src/sgml/reference.sgml
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<!-- reference.sgml
$Header: /cvsroot/pgsql/doc/src/sgml/reference.sgml,v 1.30 2002/07/18 23:11:27 petere Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/reference.sgml,v 1.31 2002/07/22 08:57:15 ishii Exp $
PostgreSQL Reference Manual
-->
......@@ -62,6 +62,7 @@ PostgreSQL Reference Manual
&createAggregate;
&createCast;
&createConstraint;
&createConversion;
&createDatabase;
&createDomain;
&createFunction;
......@@ -82,6 +83,7 @@ PostgreSQL Reference Manual
&delete;
&dropAggregate;
&dropCast;
&dropConversion;
&dropDatabase;
&dropDomain;
&dropFunction;
......
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