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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>Chapter 59. Writing a 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="plhandler.html" title="Chapter 58. Writing a Procedural Language Handler" /><link rel="next" href="fdw-functions.html" title="59.1. Foreign Data Wrapper Functions" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">Chapter 59. Writing a Foreign Data Wrapper</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="plhandler.html" title="Chapter 58. Writing a Procedural Language Handler">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="internals.html" title="Part VII. Internals">Up</a></td><th width="60%" align="center">Part VII. Internals</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="fdw-functions.html" title="59.1. Foreign Data Wrapper Functions">Next</a></td></tr></table><hr /></div><div class="chapter" id="FDWHANDLER"><div class="titlepage"><div><div><h2 class="title">Chapter 59. Writing a Foreign Data Wrapper</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="sect1"><a href="fdw-functions.html">59.1. Foreign Data Wrapper Functions</a></span></dt><dt><span class="sect1"><a href="fdw-callbacks.html">59.2. Foreign Data Wrapper Callback Routines</a></span></dt><dd><dl><dt><span class="sect2"><a href="fdw-callbacks.html#FDW-CALLBACKS-SCAN">59.2.1. FDW Routines for Scanning Foreign Tables</a></span></dt><dt><span class="sect2"><a href="fdw-callbacks.html#FDW-CALLBACKS-JOIN-SCAN">59.2.2. FDW Routines for Scanning Foreign Joins</a></span></dt><dt><span class="sect2"><a href="fdw-callbacks.html#FDW-CALLBACKS-UPPER-PLANNING">59.2.3. FDW Routines for Planning Post-Scan/Join Processing</a></span></dt><dt><span class="sect2"><a href="fdw-callbacks.html#FDW-CALLBACKS-UPDATE">59.2.4. FDW Routines for Updating Foreign Tables</a></span></dt><dt><span class="sect2"><a href="fdw-callbacks.html#FDW-CALLBACKS-TRUNCATE">59.2.5. FDW Routines for <code class="command">TRUNCATE</code></a></span></dt><dt><span class="sect2"><a href="fdw-callbacks.html#FDW-CALLBACKS-ROW-LOCKING">59.2.6. FDW Routines for Row Locking</a></span></dt><dt><span class="sect2"><a href="fdw-callbacks.html#FDW-CALLBACKS-EXPLAIN">59.2.7. FDW Routines for <code class="command">EXPLAIN</code></a></span></dt><dt><span class="sect2"><a href="fdw-callbacks.html#FDW-CALLBACKS-ANALYZE">59.2.8. FDW Routines for <code class="command">ANALYZE</code></a></span></dt><dt><span class="sect2"><a href="fdw-callbacks.html#FDW-CALLBACKS-IMPORT">59.2.9. FDW Routines for <code class="command">IMPORT FOREIGN SCHEMA</code></a></span></dt><dt><span class="sect2"><a href="fdw-callbacks.html#FDW-CALLBACKS-PARALLEL">59.2.10. FDW Routines for Parallel Execution</a></span></dt><dt><span class="sect2"><a href="fdw-callbacks.html#FDW-CALLBACKS-ASYNC">59.2.11. FDW Routines for Asynchronous Execution</a></span></dt><dt><span class="sect2"><a href="fdw-callbacks.html#FDW-CALLBACKS-REPARAMETERIZE-PATHS">59.2.12. FDW Routines for Reparameterization of Paths</a></span></dt></dl></dd><dt><span class="sect1"><a href="fdw-helpers.html">59.3. Foreign Data Wrapper Helper Functions</a></span></dt><dt><span class="sect1"><a href="fdw-planning.html">59.4. Foreign Data Wrapper Query Planning</a></span></dt><dt><span class="sect1"><a href="fdw-row-locking.html">59.5. Row Locking in Foreign Data Wrappers</a></span></dt></dl></div><a id="id-1.10.10.2" class="indexterm"></a><p>
+    All operations on a foreign table are handled through its foreign data
+    wrapper, which consists of a set of functions that the core server
+    calls.  The foreign data wrapper is responsible for fetching
+    data from the remote data source and returning it to the
+    <span class="productname">PostgreSQL</span> executor.  If updating foreign
+    tables is to be supported, the wrapper must handle that, too.
+    This chapter outlines how to write a new foreign data wrapper.
+   </p><p>
+    The foreign data wrappers included in the standard distribution are good
+    references when trying to write your own.  Look into the
+    <code class="filename">contrib</code> subdirectory of the source tree.
+    The <a class="xref" href="sql-createforeigndatawrapper.html" title="CREATE FOREIGN DATA WRAPPER"><span class="refentrytitle">CREATE FOREIGN DATA WRAPPER</span></a> reference page also has
+    some useful details.
+   </p><div class="note"><h3 class="title">Note</h3><p>
+     The SQL standard specifies an interface for writing foreign data wrappers.
+     However, PostgreSQL does not implement that API, because the effort to
+     accommodate it into PostgreSQL would be large, and the standard API hasn't
+     gained wide adoption anyway.
+    </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="plhandler.html" title="Chapter 58. Writing a Procedural Language Handler">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="internals.html" title="Part VII. Internals">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="fdw-functions.html" title="59.1. Foreign Data Wrapper Functions">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 58. Writing a Procedural Language Handler </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 59.1. Foreign Data Wrapper Functions</td></tr></table></div></body></html>
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