mirror of
https://github.com/yasuhirokimura/db18
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Yasuhiro KIMURA
113 lines
4.7 KiB
HTML
113 lines
4.7 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>Storing records</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 V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB Programmer's Reference Guide" />
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<link rel="up" href="am.html" title="Chapter 3. Access Method Operations" />
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<link rel="prev" href="am_get.html" title="Retrieving records" />
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<link rel="next" href="am_delete.html" title="Deleting records" />
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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 18.1.40</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">Storing records</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="am_get.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 3. Access Method Operations </th>
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<td width="20%" align="right"> <a accesskey="n" href="am_delete.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="am_put"></a>Storing records</h2>
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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 <a href="../api_reference/C/dbput.html" class="olink">DB->put()</a> method stores records into the database. In
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general, <a href="../api_reference/C/dbput.html" class="olink">DB->put()</a> takes a key and stores the associated data
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into the database.
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</p>
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<p>
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There are a few flags that you can set to customize
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storage:
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</p>
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<div class="variablelist">
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<dl>
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<dt>
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<span class="term">
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<a href="../api_reference/C/dbput.html#dbput_DB_APPEND" class="olink">DB_APPEND</a>
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</span>
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</dt>
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<dd>
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Simply append the data to the end of the
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database, treating the database much like a simple
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log. This flag is only valid for the Heap, Queue and
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Recno access methods. This flag is required if you are
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creating a new record in a Heap database.
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</dd>
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<dt>
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<span class="term">
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<a href="../api_reference/C/dbput.html#put_DB_NOOVERWRITE" class="olink">DB_NOOVERWRITE</a>
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</span>
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</dt>
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<dd>
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Only store the data item if the key does not
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already appear in the database.
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</dd>
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</dl>
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</div>
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<p>
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If the database has been configured to support duplicate
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records, the <a href="../api_reference/C/dbput.html" class="olink">DB->put()</a> method will add the new data value at the
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end of the duplicate set. If the database supports sorted
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duplicates, the new data value is inserted at the correct
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sorted location.
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</p>
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<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
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<h3 class="title">Note</h3>
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<p>
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If you are using the Heap access method and you are
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creating a new record in the database, then the key that
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you provide to the <a href="../api_reference/C/dbput.html" class="olink">DB->put()</a> method should be empty. The
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<a href="../api_reference/C/dbput.html" class="olink">DB->put()</a> method will return the record's ID (RID) in the
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key. The RID is automatically created for you when Heap
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database records are created.
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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="am_get.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="am.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="am_delete.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">Retrieving records </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"> Deleting records</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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