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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 12:15:05 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 12:15:05 +0000
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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>36.11. Library Functions</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="ecpg-process.html" title="36.10. Processing Embedded SQL Programs" /><link rel="next" href="ecpg-lo.html" title="36.12. Large Objects" /></head><body id="docContent" class="container-fluid col-10"><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">36.11. Library Functions</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="ecpg-process.html" title="36.10. Processing Embedded SQL Programs">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="ecpg.html" title="Chapter 36. ECPG — Embedded SQL in C">Up</a></td><th width="60%" align="center">Chapter 36. <span xmlns="http://www.w3.org/1999/xhtml" class="application">ECPG</span> — Embedded <acronym xmlns="http://www.w3.org/1999/xhtml" class="acronym">SQL</acronym> in C</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 14.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="ecpg-lo.html" title="36.12. Large Objects">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="ECPG-LIBRARY"><div class="titlepage"><div><div><h2 class="title" style="clear: both">36.11. Library Functions</h2></div></div></div><p>
+ The <code class="filename">libecpg</code> library primarily contains
+ <span class="quote">“<span class="quote">hidden</span>”</span> functions that are used to implement the
+ functionality expressed by the embedded SQL commands. But there
+ are some functions that can usefully be called directly. Note that
+ this makes your code unportable.
+ </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>
+ <code class="function">ECPGdebug(int <em class="replaceable"><code>on</code></em>, FILE
+ *<em class="replaceable"><code>stream</code></em>)</code> turns on debug
+ logging if called with the first argument non-zero. Debug logging
+ is done on <em class="replaceable"><code>stream</code></em>. The log contains
+ all <acronym class="acronym">SQL</acronym> statements with all the input
+ variables inserted, and the results from the
+ <span class="productname">PostgreSQL</span> server. This can be very
+ useful when searching for errors in your <acronym class="acronym">SQL</acronym>
+ statements.
+ </p><div class="note"><h3 class="title">Note</h3><p>
+ On Windows, if the <span class="application">ecpg</span> libraries and an application are
+ compiled with different flags, this function call will crash the
+ application because the internal representation of the
+ <code class="literal">FILE</code> pointers differ. Specifically,
+ multithreaded/single-threaded, release/debug, and static/dynamic
+ flags should be the same for the library and all applications using
+ that library.
+ </p></div></li><li class="listitem"><p>
+ <code class="function">ECPGget_PGconn(const char *<em class="replaceable"><code>connection_name</code></em>)
+ </code> returns the library database connection handle identified by the given name.
+ If <em class="replaceable"><code>connection_name</code></em> is set to <code class="literal">NULL</code>, the current
+ connection handle is returned. If no connection handle can be identified, the function returns
+ <code class="literal">NULL</code>. The returned connection handle can be used to call any other functions
+ from <span class="application">libpq</span>, if necessary.
+ </p><div class="note"><h3 class="title">Note</h3><p>
+ It is a bad idea to manipulate database connection handles made from <span class="application">ecpg</span> directly
+ with <span class="application">libpq</span> routines.
+ </p></div></li><li class="listitem"><p>
+ <code class="function">ECPGtransactionStatus(const char *<em class="replaceable"><code>connection_name</code></em>)</code>
+ returns the current transaction status of the given connection identified by <em class="replaceable"><code>connection_name</code></em>.
+ See <a class="xref" href="libpq-status.html" title="34.2. Connection Status Functions">Section 34.2</a> and libpq's <a class="xref" href="libpq-status.html#LIBPQ-PQTRANSACTIONSTATUS"><code class="function">PQtransactionStatus</code></a> for details about the returned status codes.
+ </p></li><li class="listitem"><p>
+ <code class="function">ECPGstatus(int <em class="replaceable"><code>lineno</code></em>,
+ const char* <em class="replaceable"><code>connection_name</code></em>)</code>
+ returns true if you are connected to a database and false if not.
+ <em class="replaceable"><code>connection_name</code></em> can be <code class="literal">NULL</code>
+ if a single connection is being used.
+ </p></li></ul></div></div><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navfooter"><hr></hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ecpg-process.html" title="36.10. Processing Embedded SQL Programs">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ecpg.html" title="Chapter 36. ECPG — Embedded SQL in C">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ecpg-lo.html" title="36.12. Large Objects">Next</a></td></tr><tr><td width="40%" align="left" valign="top">36.10. Processing Embedded SQL Programs </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 14.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 36.12. Large Objects</td></tr></table></div></body></html> \ No newline at end of file
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