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BerkeleyDB-Core-C-GSG.pdf
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CoreCursorUsage.html
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CoreDBAdmin.html
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CoreDbUsage.html
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CoreEnvUsage.html
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Cursors.html
(5.98 KB)
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DBEntry.html
(7.62 KB)
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DBOpenFlags.html
(4.32 KB)
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DbUsage.html
(17.74 KB)
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DeleteEntryWCursor.html
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Positioning.html
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PutEntryWCursor.html
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ReplacingEntryWCursor.html
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accessmethods.html
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btree.html
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cachesize.html
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concepts.html
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coredbclose.html
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coreindexusage.html
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cstructs.html
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databaseLimits.html
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databases.html
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dbErrorReporting.html
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dbconfig.html
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environments.html
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gettingStarted.css
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gettingit.html
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index.html
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indexes.html
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introduction.html
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joins.html
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keyCreator.html
(10.36 KB)
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moreinfo.html
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preface.html
(6.41 KB)
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readSecondary.html
(5.19 KB)
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returns.html
(4.45 KB)
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secondaryCursor.html
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secondaryDelete.html
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usingDbt.html
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Editing: returns.html
<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!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>Error Returns</title> <link rel="stylesheet" href="gettingStarted.css" type="text/css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> <link rel="start" href="index.html" title="Getting Started with Berkeley DB" /> <link rel="up" href="introduction.html" title="Chapter 1. Introduction to Berkeley DB" /> <link rel="prev" href="environments.html" title="Environments" /> <link rel="next" href="gettingit.html" title="Getting and Using DB" /> </head> <body> <div xmlns="" class="navheader"> <div class="libver"> <p>Library Version 11.2.5.3</p> </div> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">Error Returns</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="environments.html">Prev</a> </td> <th width="60%" align="center">Chapter 1. Introduction to Berkeley DB </th> <td width="20%" align="right"> <a accesskey="n" href="gettingit.html">Next</a></td> </tr> </table> <hr /> </div> <div class="sect1" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h2 class="title" style="clear: both"><a id="returns"></a>Error Returns</h2> </div> </div> </div> <p> Before continuing, it is useful to spend a few moments on error returns in DB. </p> <p> <span>The</span> DB interfaces always return a value of 0 on success. If the operation does not succeed for any reason, the return value will be non-zero. </p> <p> If a system error occurred (for example, DB ran out of disk space, or permission to access a file was denied, or an illegal argument was specified to one of the interfaces), DB returns an <code class="literal">errno</code> value. All of the possible values of <code class="literal">errno</code> are greater than 0. </p> <p> If the operation did not fail due to a system error, but was not successful either, DB returns a special error value. For example, if you tried to retrieve data from the database and the record for which you are searching does not exist, DB would return <code class="literal">DB_NOTFOUND</code>, a special error value that means the requested key does not appear in the database. All of the possible special error values are less than 0. </p> <p> DB also offers programmatic support for displaying error return values. First, the <code class="function">db_strerror</code> function returns a pointer to the error message corresponding to any DB error return, similar to the ANSI C <code class="function">strerror</code> function, but is able to handle both system error returns and DB-specific return values. </p> <p> Second, there are two error functions, <code class="methodname">DB->err</code> and <code class="methodname">DB->errx</code>. These functions work like the ANSI C <code class="function">printf</code> function, taking a printf-style format string and argument list, and optionally appending the standard error string to a message constructed from the format string and other arguments. </p> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="environments.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="introduction.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="gettingit.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">Environments </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> Getting and Using DB </td> </tr> </table> </div> </body> </html>
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