82 lines
3.4 KiB
HTML
82 lines
3.4 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>Error Returns</title>
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<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.62.4" />
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<link rel="home" href="index.html" title="Getting Started with Berkeley DB" />
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<link rel="up" href="introduction.html" title="Chapter 1. Introduction to Berkeley DB " />
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<link rel="previous" href="coreExceptions.html" title="Exception Handling" />
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<link rel="next" href="gettingit.html" title="Getting and Using DB " />
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</head>
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<body>
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<div class="navheader">
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Error Returns</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="coreExceptions.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 1. Introduction to Berkeley DB </th>
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<td width="20%" align="right"> <a accesskey="n" href="gettingit.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="returns"></a>Error Returns</h2>
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</div>
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</div>
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<div></div>
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</div>
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<p>
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<span>In addition to exceptions, the</span>
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DB interfaces always return a value of 0 on success. If the
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operation does not succeed for any reason, the return value will be
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non-zero.
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</p>
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<p>
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If a system error occurred (for example, DB ran out of disk
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space, or permission to access a file was denied, or an illegal argument
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was specified to one of the interfaces), DB returns an
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<tt class="literal">errno</tt>
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value. All of the possible values of <tt class="literal">errno</tt> are greater than 0.
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</p>
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<p>
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If the operation did not fail due to a system error, but was not
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successful either, DB returns a special error value. For
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example, if you tried to retrieve data from the database and the
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record for which you are searching does not exist, DB would return
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<tt class="literal">DB_NOTFOUND</tt>, a special error value that means the requested
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key does not appear in the database. All of the possible special error
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values are less than 0.
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</p>
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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="coreExceptions.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="introduction.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="gettingit.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">Exception Handling </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"> Getting and Using DB </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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