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504 lines
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HTML
504 lines
24 KiB
HTML
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<?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>Chapter 2. The DB Handle</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="index.html" title="Berkeley DB C API Reference" />
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<link rel="prev" href="introduction.html" title="Chapter 1. Introduction to Berkeley DB APIs" />
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<link rel="next" href="dbassociate.html" title="DB->associate()" />
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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 11.2.5.2</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">Chapter 2.
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The DB Handle
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</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="introduction.html">Prev</a> </td>
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<th width="60%" align="center"> </th>
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<td width="20%" align="right"> <a accesskey="n" href="dbassociate.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="chapter" 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"><a id="db"></a>Chapter 2.
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The DB Handle
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</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 DB is the handle for a single Berkeley DB database. A Berkeley DB database
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provides a mechanism for organizing key-data pairs of information. From the
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perspective of some database systems, a Berkeley DB database could be thought of as
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a single table within a larger database.
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</p>
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<p>
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You create a DB handle using the <a class="xref" href="dbcreate.html" title="db_create">db_create</a>
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<span>function.</span>
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For most database activities, you must then open the handle using the
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<a class="xref" href="dbopen.html" title="DB->open()">DB->open()</a>
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method. When you are done with them, handles must be closed using the
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<a class="xref" href="dbclose.html" title="DB->close()">DB->close()</a> method.
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</p>
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<p>
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Alternatively, you can create a DB and then rename, remove or verify the database
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without performing an open. See <a class="xref" href="dbrename.html" title="DB->rename()">DB->rename()</a>,
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<a class="xref" href="dbremove.html" title="DB->remove()">DB->remove()</a> or
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<a class="xref" href="dbverify.html" title="DB->verify()">DB->verify()</a> for information on these
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activities.
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</p>
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<p>
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It is possible to create databases such that they are organized within a
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<span class="emphasis"><em>database environment</em></span>. Environments are optional for simple Berkeley
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DB applications that do not use transactions, recovery, replication or any other
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advanced features. For simple Berkeley DB applications, environments still offer some
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advantages. For example, they provide some organizational
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benefits on-disk (all databases are located on disk relative to the environment). Also,
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if you are using multiple databases, then environments allow your databases to share a
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common in-memory cache, which makes for more efficient usage of your hardware's
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resources.
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</p>
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<p>
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See <a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a> for information on using database
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environments.
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</p>
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<p>
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You specify the underlying organization of the data in the database (e.g. BTree, Hash,
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Queue, and Recno) when you open the database. When you create a database,
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you are free to specify any of the available database types. On subsequent opens,
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you must either specify the access method used when you first opened the database, or
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you can specify <code class="literal">DB_UNKNOWN</code> in order to have this information
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retrieved for you. See the <a class="xref" href="dbopen.html" title="DB->open()">DB->open()</a>
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method for information on specifying database types.
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</p>
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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="dblist"></a>Database and Related Methods</h2>
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</div>
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</div>
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</div>
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<div class="navtable">
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<table border="1" width="80%">
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<thead>
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<tr>
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<th>Database Operations</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>
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<a class="xref" href="dbassociate.html" title="DB->associate()">DB->associate()</a>
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</td>
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<td>Associate a secondary index</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbassociate_foreign.html" title="DB->associate_foreign()">DB->associate_foreign()</a>
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</td>
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<td>Associate a foreign index</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbclose.html" title="DB->close()">DB->close()</a>
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</td>
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<td>Close a database</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbcompact.html" title="DB->compact()">DB->compact()</a>
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</td>
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<td>Compact a database</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbcreate.html" title="db_create">db_create</a>
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</td>
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<td>Create a database handle</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbdel.html" title="DB->del()">DB->del()</a>
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</td>
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<td>Delete items from a database</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dberr.html" title="DB->err()">DB->err()</a>
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</td>
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<td>Error message</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbexists.html" title="DB->exists()">DB->exists()</a>
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</td>
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<td>Return if an item appears in a database</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbfd.html" title="DB->fd()">DB->fd()</a>
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</td>
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<td>Return a file descriptor from a database</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbget.html" title="DB->get()">DB->get()</a>
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</td>
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<td>Get items from a database</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbget_byteswapped.html" title="DB->get_byteswapped()">DB->get_byteswapped()</a>
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</td>
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<td>Return if the underlying database is in host order</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbget_dbname.html" title="DB->get_dbname()">DB->get_dbname()</a>
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</td>
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<td>Return the file and database name</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbget_multiple.html" title="DB->get_multiple()">DB->get_multiple()</a>
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</td>
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<td>Return if the database handle references multiple databases</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbget_open_flags.html" title="DB->get_open_flags()">DB->get_open_flags()</a>
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</td>
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<td>Returns the flags specified to DB->open</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbget_type.html" title="DB->get_type()">DB->get_type()</a>
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</td>
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<td>Return the database type</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbjoin.html" title="DB->join()">DB->join()</a>
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</td>
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<td>Perform a database join on cursors</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbkey_range.html" title="DB->key_range()">DB->key_range()</a>
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</td>
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<td>Return estimate of key location</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbopen.html" title="DB->open()">DB->open()</a>
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</td>
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<td>Open a database</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbput.html" title="DB->put()">DB->put()</a>
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</td>
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<td>Store items into a database</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbremove.html" title="DB->remove()">DB->remove()</a>
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</td>
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<td>Remove a database</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbrename.html" title="DB->rename()">DB->rename()</a>
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</td>
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<td>Rename a database</td>
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</tr>
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<tr>
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<td><a class="xref" href="dbset_priority.html" title="DB->set_priority()">DB->set_priority()</a>, <a class="xref" href="dbget_priority.html" title="DB->get_priority()">DB->get_priority()</a></td>
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<td>Set/get cache page priority</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbstat.html" title="DB->stat()">DB->stat()</a>
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</td>
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<td>Database statistics</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbstat_print.html" title="DB->stat_print()">DB->stat_print()</a>
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</td>
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<td>Display database statistics</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbsync.html" title="DB->sync()">DB->sync()</a>
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</td>
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<td>Flush a database to stable storage</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbtruncate.html" title="DB->truncate()">DB->truncate()</a>
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</td>
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<td>Empty a database</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbupgrade.html" title="DB->upgrade()">DB->upgrade()</a>
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</td>
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<td>Upgrade a database</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbverify.html" title="DB->verify()">DB->verify()</a>
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</td>
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<td>Verify/salvage a database</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbcursor.html" title="DB->cursor()">DB->cursor()</a>
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</td>
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<td>Create a cursor handle</td>
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</tr>
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<tr>
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<td colspan="2">
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<span class="bold">
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<strong>Database Configuration</strong>
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</span>
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</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbset_alloc.html" title="DB->set_alloc()">DB->set_alloc()</a>
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</td>
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<td>Set local space allocation functions</td>
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</tr>
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<tr>
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<td><a class="xref" href="dbset_cachesize.html" title="DB->set_cachesize()">DB->set_cachesize()</a>, <a class="xref" href="dbget_cachesize.html" title="DB->get_cachesize()">DB->get_cachesize()</a></td>
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<td>Set/get the database cache size</td>
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</tr>
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<tr>
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<td><a class="xref" href="dbset_create_dir.html" title="DB->set_create_dir()">DB->set_create_dir()</a>, <a class="xref" href="dbget_create_dir.html" title="DB->get_create_dir()">DB->get_create_dir()</a></td>
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<td>Set/get the directory in which a database is placed</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbset_dup_compare.html" title="DB->set_dup_compare()">DB->set_dup_compare()</a>
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</td>
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<td>Set a duplicate comparison function</td>
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</tr>
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<tr>
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<td><a class="xref" href="dbset_encrypt.html" title="DB->set_encrypt()">DB->set_encrypt()</a>, <a class="xref" href="dbget_encrypt_flags.html" title="DB->get_encrypt_flags()">DB->get_encrypt_flags()</a></td>
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<td>Set/get the database cryptographic key</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="dbset_errcall.html" title="DB->set_errcall()">DB->set_errcall()</a>
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</td>
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<td>Set error message callback</td>
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</tr>
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<tr>
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<td><a class="xref" href="dbset_errfile.html" title="DB->set_errfile()">DB->set_errfile()</a>, <a class="xref" href="dbget_errfile.html" title="DB->get_errfile()">DB->get_errfile()</a></td>
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<td>Set/get error message FILE</td>
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</tr>
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<tr>
|
|||
|
|
<td><a class="xref" href="dbset_errpfx.html" title="DB->set_errpfx()">DB->set_errpfx()</a>, <a class="xref" href="dbget_errpfx.html" title="DB->get_errpfx()">DB->get_errpfx()</a></td>
|
|||
|
|
<td>Set/get error message prefix</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="dbset_feedback.html" title="DB->set_feedback()">DB->set_feedback()</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Set feedback callback</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td><a class="xref" href="dbset_flags.html" title="DB->set_flags()">DB->set_flags()</a>, <a class="xref" href="dbget_flags.html" title="DB->get_flags()">DB->get_flags()</a></td>
|
|||
|
|
<td>Set/get general database configuration</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td><a class="xref" href="dbset_lorder.html" title="DB->set_lorder()">DB->set_lorder()</a>, <a class="xref" href="dbget_lorder.html" title="DB->get_lorder()">DB->get_lorder()</a></td>
|
|||
|
|
<td>Set/get the database byte order</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="dbset_msgcall.html" title="DB->set_msgcall()">DB->set_msgcall()</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Set informational message callback</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td><a class="xref" href="dbset_msgfile.html" title="DB->set_msgfile()">DB->set_msgfile()</a>, <a class="xref" href="dbget_msgfile.html" title="DB->get_msgfile()">DB->get_msgfile()</a></td>
|
|||
|
|
<td>Set/get informational message FILE</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td><a class="xref" href="dbset_pagesize.html" title="DB->set_pagesize()">DB->set_pagesize()</a>, <a class="xref" href="dbget_pagesize.html" title="DB->get_pagesize()">DB->get_pagesize()</a></td>
|
|||
|
|
<td>Set/get the underlying database page size</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="dbset_partition.html" title="DB->set_partition()">DB->set_partition()</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Set database partitioning</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td><a class="xref" href="dbset_partition_dirs.html" title="DB->set_partition_dirs()">DB->set_partition_dirs()</a>, <a class="xref" href="dbget_partition_dirs.html" title="DB->get_partition_dirs()">DB->get_partition_dirs()</a></td>
|
|||
|
|
<td>Set/get the directories used for database partitions</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td colspan="2">
|
|||
|
|
<span class="bold">
|
|||
|
|
<strong>Btree/Recno Configuration</strong>
|
|||
|
|
</span>
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="dbset_append_recno.html" title="DB->set_append_recno()">DB->set_append_recno()</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Set record append callback</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="dbset_bt_compare.html" title="DB->set_bt_compare()">DB->set_bt_compare()</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Set a Btree comparison function</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="dbset_bt_compress.html" title="DB->set_bt_compress()">DB->set_bt_compress()</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Set Btree compression functions</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td><a class="xref" href="dbset_bt_minkey.html" title="DB->set_bt_minkey()">DB->set_bt_minkey()</a>, <a class="xref" href="dbget_bt_minkey.html" title="DB->get_bt_minkey()">DB->get_bt_minkey()</a></td>
|
|||
|
|
<td>Set/get the minimum number of keys per Btree page</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="dbset_bt_prefix.html" title="DB->set_bt_prefix()">DB->set_bt_prefix()</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Set a Btree prefix comparison function</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td><a class="xref" href="dbset_re_delim.html" title="DB->set_re_delim()">DB->set_re_delim()</a>, <a class="xref" href="dbget_re_delim.html" title="DB->get_re_delim()">DB->get_re_delim()</a></td>
|
|||
|
|
<td>Set/get the variable-length record delimiter</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td><a class="xref" href="dbset_re_len.html" title="DB->set_re_len()">DB->set_re_len()</a>, <a class="xref" href="dbget_re_len.html" title="DB->get_re_len()">DB->get_re_len()</a></td>
|
|||
|
|
<td>Set/get the fixed-length record length</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td><a class="xref" href="dbset_re_pad.html" title="DB->set_re_pad()">DB->set_re_pad()</a>, <a class="xref" href="dbget_re_pad.html" title="DB->get_re_pad()">DB->get_re_pad()</a></td>
|
|||
|
|
<td>Set/get the fixed-length record pad byte</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td><a class="xref" href="dbset_re_source.html" title="DB->set_re_source()">DB->set_re_source()</a>, <a class="xref" href="dbget_re_source.html" title="DB->get_re_source()">DB->get_re_source()</a></td>
|
|||
|
|
<td>Set/get the backing Recno text file</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td colspan="2">
|
|||
|
|
<span class="bold">
|
|||
|
|
<strong>Hash Configuration</strong>
|
|||
|
|
</span>
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="dbset_h_compare.html" title="DB->set_h_compare()">DB->set_h_compare()</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Set a Hash comparison function</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td><a class="xref" href="dbset_h_ffactor.html" title="DB->set_h_ffactor()">DB->set_h_ffactor()</a>, <a class="xref" href="dbget_h_ffactor.html" title="DB->get_h_ffactor()">DB->get_h_ffactor()</a></td>
|
|||
|
|
<td>Set/get the Hash table density</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="dbset_h_hash.html" title="DB->set_h_hash()">DB->set_h_hash()</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Set a hashing function</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td><a class="xref" href="dbset_h_nelem.html" title="DB->set_h_nelem()">DB->set_h_nelem()</a>, <a class="xref" href="dbget_h_nelem.html" title="DB->get_h_nelem()">DB->get_h_nelem()</a></td>
|
|||
|
|
<td>Set/get the Hash table size</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td colspan="2">
|
|||
|
|
<span class="bold">
|
|||
|
|
<strong>Queue Configuration</strong>
|
|||
|
|
</span>
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td><a class="xref" href="dbset_q_extentsize.html" title="DB->set_q_extentsize()">DB->set_q_extentsize()</a>, <a class="xref" href="dbget_q_extentsize.html" title="DB->get_q_extentsize()">DB->get_q_extentsize()</a></td>
|
|||
|
|
<td>Set/get Queue database extent size</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td colspan="2">
|
|||
|
|
<span class="bold">
|
|||
|
|
<strong>Heap</strong>
|
|||
|
|
</span>
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td><a class="xref" href="dbset_heapsize.html" title="DB->set_heapsize()">DB->set_heapsize()</a>, <a class="xref" href="dbget_heapsize.html" title="DB->get_heapsize()">DB->get_heapsize()</a></td>
|
|||
|
|
<td>Set/get the database heap size</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="db_heap_rid.html" title="DB_HEAP_RID">DB_HEAP_RID</a>
|
|||
|
|
</td>
|
|||
|
|
<td></td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td colspan="2">
|
|||
|
|
<span class="bold">
|
|||
|
|
<strong>Database Utilities</strong>
|
|||
|
|
</span>
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="db_copy.html" title="db_copy">db_copy</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Copy a named database to a target directory</td>
|
|||
|
|
</tr>
|
|||
|
|
</tbody>
|
|||
|
|
</table>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<div class="navfooter">
|
|||
|
|
<hr />
|
|||
|
|
<table width="100%" summary="Navigation footer">
|
|||
|
|
<tr>
|
|||
|
|
<td width="40%" align="left"><a accesskey="p" href="introduction.html">Prev</a> </td>
|
|||
|
|
<td width="20%" align="center"> </td>
|
|||
|
|
<td width="40%" align="right"> <a accesskey="n" href="dbassociate.html">Next</a></td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td width="40%" align="left" valign="top">Chapter 1. Introduction to Berkeley DB APIs </td>
|
|||
|
|
<td width="20%" align="center">
|
|||
|
|
<a accesskey="h" href="index.html">Home</a>
|
|||
|
|
</td>
|
|||
|
|
<td width="40%" align="right" valign="top"> DB->associate()</td>
|
|||
|
|
</tr>
|
|||
|
|
</table>
|
|||
|
|
</div>
|
|||
|
|
</body>
|
|||
|
|
</html>
|