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Basic foreign table support.

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Foreign tables are a core component of SQL/MED.  This commit does
not provide a working SQL/MED infrastructure, because foreign tables
cannot yet be queried.  Support for foreign table scans will need to
be added in a future patch.  However, this patch creates the necessary
system catalog structure, syntax support, and support for ancillary
operations such as COMMENT and SECURITY LABEL.

Shigeru Hanada, heavily revised by Robert Haas
This commit is contained in:
Robert Haas
2011-01-01 23:48:11 -05:00
parent 6600d5e91c
commit 0d692a0dc9
69 changed files with 2275 additions and 211 deletions
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doc/src/sgml/ref/drop_foreign_table.sgml Normal file
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<!-- doc/src/sggml/ref/drop_foreign_table.sgml -->
<refentry id="SQL-DROPFOREIGNTABLE">
<refmeta>
<refentrytitle>DROP FOREIGN TABLE</refentrytitle>
<manvolnum>7</manvolnum>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>DROP FOREIGN TABLE</refname>
<refpurpose>remove a foreign table</refpurpose>
</refnamediv>
<indexterm zone="sql-dropforeigntable">
<primary>DROP FOREIGN TABLE</primary>
</indexterm>
<refsynopsisdiv>
<synopsis>
DROP FOREIGN TABLE [ IF EXISTS ] <replaceable class="PARAMETER">name</replaceable> [, ...] [ CASCADE | RESTRICT ]
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<command>DROP FOREIGN TABLE</command> removes a foreign table.
Only the owner of a foreign table can remove it.
</para>
</refsect1>
<refsect1>
<title>Parameters</title>
<variablelist>
<varlistentry>
<term><literal>IF EXISTS</literal></term>
<listitem>
<para>
Do not throw an error if the foreign table does not exist.
A notice is issued in this case.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="PARAMETER">name</replaceable></term>
<listitem>
<para>
The name (optionally schema-qualified) of the foreign table to drop.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>CASCADE</literal></term>
<listitem>
<para>
Automatically drop objects that depend on the foreign table (such as
views).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>RESTRICT</literal></term>
<listitem>
<para>
Refuse to drop the foreign table if any objects depend on it. This is
the default.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
To destroy two foreign tables, <literal>films</literal> and
<literal>distributors</literal>:
<programlisting>
DROP FOREIGN TABLE films, distributors;
</programlisting>
</para>
</refsect1>
<refsect1>
<title>Compatibility</title>
<para>
This command conforms to the ISO/IEC 9075-9 (SQL/MED), except that the
standard only allows one foreign table to be dropped per command, and apart
from the <literal>IF EXISTS</> option, which is a <productname>PostgreSQL</>
extension.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<simplelist type="inline">
<member><xref linkend="sql-alterforeigntable"></member>
<member><xref linkend="sql-createforeigntable"></member>
</simplelist>
</refsect1>
</refentry>