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Add transforms feature

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This provides a mechanism for specifying conversions between SQL data
types and procedural languages.  As examples, there are transforms
for hstore and ltree for PL/Perl and PL/Python.

reviews by Pavel Stěhule and Andres Freund
This commit is contained in:
Peter Eisentraut
2015-04-26 10:33:14 -04:00
parent f320cbb615
commit cac7658205
101 changed files with 6034 additions and 2811 deletions
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doc/src/sgml/ref/drop_transform.sgml Normal file
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<!-- doc/src/sgml/ref/drop_transform.sgml -->
<refentry id="SQL-DROPTRANSFORM">
<indexterm zone="sql-droptransform">
<primary>DROP TRANSFORM</primary>
</indexterm>
<refmeta>
<refentrytitle>DROP TRANSFORM</refentrytitle>
<manvolnum>7</manvolnum>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>DROP TRANSFORM</refname>
<refpurpose>remove a transform</refpurpose>
</refnamediv>
<refsynopsisdiv>
<synopsis>
DROP TRANSFORM [ IF EXISTS ] FOR <replaceable>type_name</replaceable> LANGUAGE <replaceable>lang_name</replaceable>
</synopsis>
</refsynopsisdiv>
<refsect1 id="sql-droptransform-description">
<title>Description</title>
<para>
<command>DROP TRANSFORM</command> removes a previously defined transform.
</para>
<para>
To be able to drop a transform, you must own the type and the language.
These are the same privileges that are required to create a transform.
</para>
</refsect1>
<refsect1>
<title>Parameters</title>
<variablelist>
<varlistentry>
<term><literal>IF EXISTS</literal></term>
<listitem>
<para>
Do not throw an error if the transform does not exist. A notice is issued
in this case.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable>type_name</replaceable></term>
<listitem>
<para>
The name of the data type of the transform.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable>lang_name</replaceable></term>
<listitem>
<para>
The name of the language of the transform.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>CASCADE</literal></term>
<listitem>
<para>
Automatically drop objects that depend on the transform.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>RESTRICT</literal></term>
<listitem>
<para>
Refuse to drop the transform if any objects depend on it. This is the
default.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="sql-droptransform-examples">
<title>Examples</title>
<para>
To drop the transform for type <type>hstore</type> and language
<literal>plpythonu</literal>:
<programlisting>
DROP TRANSFORM FOR hstore LANGUAGE plpythonu;
</programlisting></para>
</refsect1>
<refsect1 id="sql-droptransform-compat">
<title>Compatibility</title>
<para>
This form of <command>DROP TRANSFORM</command> is a
<productname>PostgreSQL</productname> extension. See <xref
linkend="sql-createtransform"> for details.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<simplelist type="inline">
<member><xref linkend="sql-createtransform"></member>
</simplelist>
</refsect1>
</refentry>