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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>53.23. pg_foreign_data_wrapper</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="catalog-pg-extension.html" title="53.22. pg_extension" /><link rel="next" href="catalog-pg-foreign-server.html" title="53.24. pg_foreign_server" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">53.23. <code class="structname">pg_foreign_data_wrapper</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="catalog-pg-extension.html" title="53.22. pg_extension">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="catalogs.html" title="Chapter 53. System Catalogs">Up</a></td><th width="60%" align="center">Chapter 53. System Catalogs</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 16.3 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="catalog-pg-foreign-server.html" title="53.24. pg_foreign_server">Next</a></td></tr></table><hr /></div><div class="sect1" id="CATALOG-PG-FOREIGN-DATA-WRAPPER"><div class="titlepage"><div><div><h2 class="title" style="clear: both">53.23. <code class="structname">pg_foreign_data_wrapper</code> <a href="#CATALOG-PG-FOREIGN-DATA-WRAPPER" class="id_link">#</a></h2></div></div></div><a id="id-1.10.4.25.2" class="indexterm"></a><p>
The catalog <code class="structname">pg_foreign_data_wrapper</code> stores
foreign-data wrapper definitions. A foreign-data wrapper is the
mechanism by which external data, residing on foreign servers, is
accessed.
</p><div class="table" id="id-1.10.4.25.4"><p class="title"><strong>Table 53.23. <code class="structname">pg_foreign_data_wrapper</code> Columns</strong></p><div class="table-contents"><table class="table" summary="pg_foreign_data_wrapper Columns" border="1"><colgroup><col /></colgroup><thead><tr><th class="catalog_table_entry"><p class="column_definition">
Column Type
</p>
<p>
Description
</p></th></tr></thead><tbody><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">oid</code> <code class="type">oid</code>
</p>
<p>
Row identifier
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">fdwname</code> <code class="type">name</code>
</p>
<p>
Name of the foreign-data wrapper
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">fdwowner</code> <code class="type">oid</code>
(references <a class="link" href="catalog-pg-authid.html" title="53.8. pg_authid"><code class="structname">pg_authid</code></a>.<code class="structfield">oid</code>)
</p>
<p>
Owner of the foreign-data wrapper
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">fdwhandler</code> <code class="type">oid</code>
(references <a class="link" href="catalog-pg-proc.html" title="53.39. pg_proc"><code class="structname">pg_proc</code></a>.<code class="structfield">oid</code>)
</p>
<p>
References a handler function that is responsible for
supplying execution routines for the foreign-data wrapper.
Zero if no handler is provided
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">fdwvalidator</code> <code class="type">oid</code>
(references <a class="link" href="catalog-pg-proc.html" title="53.39. pg_proc"><code class="structname">pg_proc</code></a>.<code class="structfield">oid</code>)
</p>
<p>
References a validator function that is responsible for
checking the validity of the options given to the
foreign-data wrapper, as well as options for foreign servers and user
mappings using the foreign-data wrapper. Zero if no validator
is provided
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">fdwacl</code> <code class="type">aclitem[]</code>
</p>
<p>
Access privileges; see <a class="xref" href="ddl-priv.html" title="5.7. Privileges">Section 5.7</a> for details
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">fdwoptions</code> <code class="type">text[]</code>
</p>
<p>
Foreign-data wrapper specific options, as <span class="quote">“<span class="quote">keyword=value</span>”</span> strings
</p></td></tr></tbody></table></div></div><br class="table-break" /></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="catalog-pg-extension.html" title="53.22. pg_extension">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="catalogs.html" title="Chapter 53. System Catalogs">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="catalog-pg-foreign-server.html" title="53.24. pg_foreign_server">Next</a></td></tr><tr><td width="40%" align="left" valign="top">53.22. <code class="structname">pg_extension</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 16.3 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 53.24. <code class="structname">pg_foreign_server</code></td></tr></table></div></body></html>