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9.3 KiB
HTML
223 lines
9.3 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>DB->err()</title>
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<link rel="stylesheet" href="apiReference.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB C API Reference" />
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<link rel="up" href="db.html" title="Chapter 2. The DB Handle" />
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<link rel="prev" href="dbdel.html" title="DB->del()" />
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<link rel="next" href="dbexists.html" title="DB->exists()" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.3</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">DB->err()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="dbdel.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 2.
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The DB Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="dbexists.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="dberr"></a>DB->err()</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">#include <db.h>
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void
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DB->err(DB *db, int error, const char *fmt, ...);
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void
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DB->errx(DB *db, const char *fmt, ...); </pre>
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<p>
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The <a class="xref" href="enverr.html" title="DB_ENV->err()">DB_ENV->err()</a>,
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<code class="methodname">DB_ENV->errx()</code>, <code class="methodname">DB->err()</code> and
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<code class="methodname">DB->errx()</code> methods provide error-messaging functionality for
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applications written using the Berkeley DB library.
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</p>
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<p>
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The <code class="methodname">DB->err()</code> and <a class="xref" href="enverr.html" title="DB_ENV->err()">DB_ENV->err()</a> methods construct
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an error message consisting of the following elements:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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<span class="bold"><strong>An optional prefix string</strong></span>
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</p>
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<p>
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If no error callback function has been set using the
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<a class="xref" href="envset_errcall.html" title="DB_ENV->set_errcall()">DB_ENV->set_errcall()</a>
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method, any prefix string specified using the
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<a class="xref" href="envset_errpfx.html" title="DB_ENV->set_errpfx()">DB_ENV->set_errpfx()</a>
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method, followed by two separating characters: a colon and a
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<space> character.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>An optional printf-style message</strong></span>
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</p>
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<p>
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The supplied message <span class="bold"><strong>fmt</strong></span>, if
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non-NULL, in which the ANSI C X3.159-1989 (ANSI C) printf function
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specifies how subsequent parameters are converted for output.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>A separator</strong></span>
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</p>
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<p>
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Two separating characters: a colon and a <space> character.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>A standard error string</strong></span>
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</p>
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<p>
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The standard system or Berkeley DB library error string associated
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with the <span class="bold"><strong>error</strong></span> value, as returned by
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the <a class="xref" href="envstrerror.html" title="db_strerror">db_strerror</a>
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method.
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</p>
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</li>
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</ul>
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</div>
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<p>
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The <code class="methodname">DB->errx()</code> and <code class="methodname">DB_ENV->errx()</code> methods
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are the same as the <code class="methodname">DB->err()</code> and
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<a class="xref" href="enverr.html" title="DB_ENV->err()">DB_ENV->err()</a> methods, except they do not append
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the final separator characters and standard error string to the error message.
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</p>
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<p>
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This constructed error message is then handled as follows:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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If an error callback function has been set (see
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<a class="xref" href="dbset_errcall.html" title="DB->set_errcall()">DB->set_errcall()</a> and
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<a class="xref" href="envset_errcall.html" title="DB_ENV->set_errcall()">DB_ENV->set_errcall()</a>),
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that function is called with two parameters: any prefix string
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specified (see <a class="xref" href="dbset_errpfx.html" title="DB->set_errpfx()">DB->set_errpfx()</a>
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and <a class="xref" href="envset_errpfx.html" title="DB_ENV->set_errpfx()">DB_ENV->set_errpfx()</a>) and
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the error message.
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</p>
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</li>
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<li>
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<p>
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If a C library FILE * has been set (see
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<a class="xref" href="dbset_errfile.html" title="DB->set_errfile()">DB->set_errfile()</a> and
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<a class="xref" href="envset_errfile.html" title="DB_ENV->set_errfile()">DB_ENV->set_errfile()</a>),
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the error message is written to that output stream.
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</p>
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</li>
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<li>
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<p>
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If none of these output options have been configured, the error message
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is written to stderr, the standard error output stream.
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</p>
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</li>
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</ul>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="idp57451312"></a>Parameters</h3>
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</div>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="idp57420464"></a>error</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>error</strong></span> parameter is the error
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value for which the <a class="xref" href="enverr.html" title="DB_ENV->err()">DB_ENV->err()</a>
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and <code class="methodname">DB->err()</code> methods will display an explanatory string.
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</p>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="idp57490736"></a>fmt</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>fmt</strong></span> parameter is an optional
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printf-style message to display.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="idp57425536"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="db.html" title="Chapter 2. The DB Handle">DB</a>
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="idp57487424"></a>See Also</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="db.html#dblist" title="Database and Related Methods">Database and Related Methods</a>
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</p>
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</div>
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</div>
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<div class="navfooter">
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<hr />
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||
<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="dbdel.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="db.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="dbexists.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">DB->del() </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> DB->exists()</td>
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</tr>
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</table>
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||
</div>
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</body>
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</html>
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