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591 lines
26 KiB
HTML
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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->get()</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="dbfd.html" title="DB->fd()" />
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<link rel="next" href="dbget_bt_minkey.html" title="DB->get_bt_minkey()" />
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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->get()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="dbfd.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="dbget_bt_minkey.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="dbget"></a>DB->get()</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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int
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DB->get(DB *db,
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DB_TXN *txnid, DBT *key, DBT *data, u_int32_t flags);
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int
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DB->pget(DB *db,
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DB_TXN *txnid, DBT *key, DBT *pkey, DBT *data, u_int32_t flags); </pre>
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<p>
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The <code class="methodname">DB->get()</code> method retrieves key/data
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pairs from the database. The address and length of the data
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associated with the specified <span class="bold"><strong>key</strong></span>
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are returned in the structure to which
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<span class="bold"><strong>data</strong></span> refers.
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</p>
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<p>
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In the presence of duplicate key values,
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<code class="methodname">DB->get()</code> will return the first data
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item for the designated key. Duplicates are sorted by:
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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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||
Their sort order, if a duplicate sort function was specified.
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||
</p>
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||
</li>
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||
<li>
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||
<p>
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||
Any explicit cursor designated insertion.
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||
</p>
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||
</li>
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||
<li>
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<p>
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By insert order. This is the default behavior.
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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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<span class="bold"><strong>Retrieval of duplicates requires the use of cursor operations.</strong></span>
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See <a class="xref" href="dbcget.html" title="DBcursor->get()">DBcursor->get()</a> for details.
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</p>
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<p>
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When called on a database that has been made into a secondary
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index using the
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<a class="xref" href="dbassociate.html" title="DB->associate()">DB->associate()</a> method, the
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||
<code class="methodname">DB->get()</code> and
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<code class="methodname">DB->pget()</code> methods return the key from
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the secondary index and the data item from the primary database.
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In addition, the <code class="methodname">DB->pget()</code> method
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||
returns the key from the primary database. In databases that are
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||
not secondary indices, the <code class="methodname">DB->pget()</code>
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||
method will always fail.
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||
</p>
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||
<p>
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||
The <code class="methodname">DB->get()</code> method will return
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<a href="../../programmer_reference/program_errorret.html#program_errorret.DB_NOTFOUND" class="olink">DB_NOTFOUND</a> if
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the specified key is not in the database. The
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||
<code class="methodname">DB->get()</code> method will return
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<a href="../../programmer_reference/program_errorret.html#program_errorret.DB_KEYEMPTY" class="olink">DB_KEYEMPTY</a> if
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the database is a Queue or Recno database and the specified key
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exists, but was never explicitly created by the application or was
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later deleted. Unless otherwise specified, the
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<code class="methodname">DB->get()</code> <span>
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<span>
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method returns a non-zero error value on failure and 0 on success.
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</span>
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||
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||
</span>
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||
</p>
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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="idp57527232"></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="idp57496096"></a>txnid</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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||
If the operation is part of an application-specified transaction, the
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<span class="bold"><strong>txnid</strong></span> parameter is a transaction
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handle returned from <a class="xref" href="txnbegin.html" title="DB_ENV->txn_begin()">DB_ENV->txn_begin()</a>;
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||
if the operation is part of a Berkeley DB Concurrent Data Store group, the
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||
<span class="bold"><strong>txnid</strong></span> parameter is a handle returned
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||
from <a class="xref" href="envcdsgroup_begin.html" title="DB_ENV->cdsgroup_begin()">DB_ENV->cdsgroup_begin()</a>;
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otherwise NULL. If no transaction handle is specified, but the
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operation occurs in a transactional database, the operation will be
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implicitly transaction protected.
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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="idp57496528"></a>key</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 key <a class="link" href="dbt.html" title="Chapter 4. The DBT Handle">DBT</a> operated on.
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||
</p>
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||
<p>
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||
If <a class="link" href="dbt.html#dbt_DB_DBT_PARTIAL">DB_DBT_PARTIAL</a>
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||
is set for the DBT used for this parameter,
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||
and if the <span class="bold"><strong>flags</strong></span>
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parameter is not set to
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<a class="link" href="dbget.html#dbget_DB_CONSUME">DB_CONSUME</a>
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||
<a class="link" href="dbget.html#dbget_DB_CONSUME_WAIT">DB_CONSUME_WAIT</a>, or
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<a class="link" href="dbget.html#dbget_DB_SET_RECNO">DB_SET_RECNO</a>,
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then this method will fail and return <code class="literal">EINVAL</code>.
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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="idp57538288"></a>pkey</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>pkey</strong></span> parameter is the return key
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from the primary database. If
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<a class="link" href="dbt.html#dbt_DB_DBT_PARTIAL">DB_DBT_PARTIAL</a>
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is set for the DBT used for this parameter,
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then this method will fail and return <code class="literal">EINVAL</code>.
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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="idp57512056"></a>data</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 data <a class="link" href="dbt.html" title="Chapter 4. The DBT Handle">DBT</a> operated on.
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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="idp57501880"></a>flags</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>flags</strong></span> parameter must be set to 0
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or one of the following values:
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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><a id="dbget_DB_CONSUME"></a>
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<code class="literal">DB_CONSUME</code>
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</p>
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<p>
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Return the record number and data from the available record closest to
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the head of the queue, and delete the record. The record number will
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be returned in <span class="bold"><strong>key</strong></span>, as described in
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||
<a class="link" href="dbt.html" title="Chapter 4. The DBT Handle">DBT</a>. The data will be
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returned in the <span class="bold"><strong>data</strong></span> parameter. A
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record is available if it is not deleted and is not currently locked.
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The underlying database must be of type Queue for DB_CONSUME to be
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specified.
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</p>
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||
</li>
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||
<li>
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<p><a id="dbget_DB_CONSUME_WAIT"></a>
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<code class="literal">DB_CONSUME_WAIT</code>
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</p>
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<p>
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The DB_CONSUME_WAIT flag is the same as the DB_CONSUME flag, except
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that if the Queue database is empty, the thread of control will wait
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until there is data in the queue before returning. The underlying
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database must be of type Queue for DB_CONSUME_WAIT to be specified.
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</p>
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<p>
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If lock or transaction timeouts have been
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specified, the <code class="methodname">DB->get()</code>
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method with the DB_CONSUME_WAIT flag may return
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<a href="../../programmer_reference/program_errorret.html#program_errorret.DB_LOCK_NOTGRANTED" class="olink">DB_LOCK_NOTGRANTED</a>.
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This failure, by itself, does not require the
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enclosing transaction be aborted.
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</p>
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</li>
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<li>
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<p><a id="get_DB_GET_BOTH"></a>
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<code class="literal">DB_GET_BOTH</code>
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</p>
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<p>
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Retrieve the key/data pair only if both the key and data match the
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arguments.
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</p>
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<p>
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When using a secondary index handle, the <code class="literal">DB_GET_BOTH</code>:
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||
flag causes:
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</p>
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<div class="itemizedlist">
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||
<ul type="circle">
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||
<li>
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<p>
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the <code class="methodname">DB->pget()</code> version of
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this method to retun the secondary key/primary
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key/data tuple only if both the primary and
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secondary keys match the arguments.
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</p>
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||
</li>
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||
<li>
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<p>
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the <code class="methodname">DB->get()</code> version of this method
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to result in an error.
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</p>
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||
</li>
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</ul>
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</div>
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</li>
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<li>
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<p><a id="dbget_DB_SET_RECNO"></a>
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<code class="literal">DB_SET_RECNO</code>
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</p>
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<p>
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Retrieve the specified numbered key/data pair from a database. Upon
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return, both the <span class="bold"><strong>key</strong></span> and <span class="bold"><strong>data</strong></span> items will have been filled in.
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||
</p>
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||
<p>
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||
The <span class="bold"><strong>data</strong></span> field of the specified
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||
<span class="bold"><strong>key</strong></span> must be a pointer to a logical
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||
record number (that is, a <span class="bold"><strong>db_recno_t</strong></span>). This record number determines the
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||
record to be retrieved.
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||
</p>
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||
<p>
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||
For DB_SET_RECNO to be specified, the underlying database must be of
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||
type Btree, and it must have been created with the DB_RECNUM flag.
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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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In addition, the following flags may be set by bitwise inclusively
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<span class="bold"><strong>OR</strong></span>'ing them into the <span class="bold"><strong>flags</strong></span> parameter:
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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><a id="get_DB_IGNORE_LEASE"></a>
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<code class="literal">DB_IGNORE_LEASE</code>
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</p>
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<p>
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Return the data item irrespective of the state of master leases. The
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||
item will be returned under all conditions: if master leases are not
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||
configured, if the request is made to a client, if the request is made
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||
to a master with a valid lease, or if the request is made to a master
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||
without a valid lease.
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||
</p>
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||
</li>
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||
<li>
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||
<p><a id="get_DB_MULTIPLE"></a>
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<code class="literal">DB_MULTIPLE</code>
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</p>
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<p>
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Return multiple data items in the buffer to which the <span class="bold"><strong>data</strong></span> parameter refers.
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</p>
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<p>
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In the case of Btree or Hash databases, all of the data items
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||
associated with the specified key are entered into the buffer. In the
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||
case of Queue, Recno or Heap databases, all of the data items in the
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||
database, starting at, and subsequent to, the specified key, are
|
||
entered into the buffer.
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||
</p>
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||
<p>
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||
The buffer to which the <span class="bold"><strong>data</strong></span>
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||
parameter refers must be provided from user memory (see
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||
<a class="link" href="dbt.html#dbt_DB_DBT_USERMEM">DB_DBT_USERMEM</a>).
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||
The buffer must be at least as large as the page size of the
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||
underlying database, aligned for unsigned integer access, and be a
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multiple of 1024 bytes in size. If the buffer size is insufficient,
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||
then upon return from the call the size field of the <span class="bold"><strong>data</strong></span> parameter will have been set to an
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estimated buffer size, and the error DB_BUFFER_SMALL is returned.
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(The size is an estimate as the exact size needed may not be known
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||
until all entries are read. It is best to initially provide a
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relatively large buffer, but applications should be prepared to resize
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||
the buffer as necessary and repeatedly call the method.)
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</p>
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<p>
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The DB_MULTIPLE flag may only be used alone, or with the DB_GET_BOTH
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||
and DB_SET_RECNO options. The DB_MULTIPLE flag may not be used when
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||
accessing databases made into secondary indices using the
|
||
<a class="xref" href="dbassociate.html" title="DB->associate()">DB->associate()</a> method.
|
||
</p>
|
||
<p>
|
||
See the <a class="xref" href="dbt.html#dbtlist" title="DBT and Bulk Operations">DBT and Bulk Operations</a>
|
||
for more information on working with bulk get.
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||
</p>
|
||
</li>
|
||
<li>
|
||
<p><a id="get_DB_READ_COMMITTED"></a>
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||
<code class="literal">DB_READ_COMMITTED</code>
|
||
</p>
|
||
<p>
|
||
Configure a transactional get operation to have degree 2 isolation
|
||
(the read is not repeatable).
|
||
</p>
|
||
</li>
|
||
<li>
|
||
<p><a id="get_DB_READ_UNCOMMITTED"></a>
|
||
<code class="literal">DB_READ_UNCOMMITTED</code>
|
||
</p>
|
||
<p>
|
||
Configure a transactional get operation to have degree 1 isolation,
|
||
reading modified but not yet committed data. Silently ignored if the
|
||
<a class="link" href="dbopen.html#dbopen_DB_READ_UNCOMMITTED">DB_READ_UNCOMMITTED</a>
|
||
flag was not specified when the underlying database was opened.
|
||
</p>
|
||
</li>
|
||
<li>
|
||
<p><a id="get_DB_RMW"></a>
|
||
<code class="literal">DB_RMW</code>
|
||
</p>
|
||
<p>
|
||
Acquire write locks instead of read locks when doing the read, if
|
||
locking is configured. Setting this flag can eliminate deadlock
|
||
during a read-modify-write cycle by acquiring the write lock during
|
||
the read part of the cycle so that another thread of control acquiring
|
||
a read lock for the same item, in its own read-modify-write cycle,
|
||
will not result in deadlock.
|
||
</p>
|
||
<p>
|
||
Because the <code class="methodname">DB->get()</code>
|
||
method will not hold locks across Berkeley DB
|
||
calls in non-transactional operations, the
|
||
<a class="link" href="dbcget.html#dbcget_DB_RMW">DB_RMW</a>
|
||
flag to the <code class="methodname">DB->get()</code> call is
|
||
meaningful only in the presence of transactions.
|
||
</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<div class="sect2" lang="en" xml:lang="en">
|
||
<div class="titlepage">
|
||
<div>
|
||
<div>
|
||
<h3 class="title"><a id="idp57550240"></a>Errors</h3>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p>
|
||
The <code class="methodname">DB->get()</code> <span>
|
||
<span>
|
||
method may fail and return one of the following non-zero errors:
|
||
</span>
|
||
|
||
</span>
|
||
</p>
|
||
<div class="sect3" lang="en" xml:lang="en">
|
||
<div class="titlepage">
|
||
<div>
|
||
<div>
|
||
<h4 class="title"><a id="idp57547752"></a>DB_BUFFER_SMALL</h4>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p>
|
||
The requested item could not be returned due to undersized buffer.
|
||
</p>
|
||
</div>
|
||
<div class="sect3" lang="en" xml:lang="en">
|
||
<div class="titlepage">
|
||
<div>
|
||
<div>
|
||
<h4 class="title"><a id="idp57497080"></a>DB_LOCK_DEADLOCK</h4>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p>
|
||
A transactional database environment operation was selected to resolve
|
||
a deadlock.
|
||
</p>
|
||
</div>
|
||
<div class="sect3" lang="en" xml:lang="en">
|
||
<div class="titlepage">
|
||
<div>
|
||
<div>
|
||
<h4 class="title"><a id="idp57553616"></a>DB_LOCK_NOTGRANTED</h4>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p>
|
||
A Berkeley DB Concurrent Data Store database environment configured
|
||
for lock timeouts was unable to grant a lock in the allowed time.
|
||
</p>
|
||
<p>
|
||
You attempted to open a database handle that is configured
|
||
for no waiting exclusive locking, but the exclusive lock could not be
|
||
immediately obtained. See
|
||
<a class="xref" href="dbset_lk_exclusive.html" title="DB->set_lk_exclusive()">DB->set_lk_exclusive()</a>
|
||
for more information.
|
||
</p>
|
||
</div>
|
||
<div class="sect3" lang="en" xml:lang="en">
|
||
<div class="titlepage">
|
||
<div>
|
||
<div>
|
||
<h4 class="title"><a id="idp57568056"></a>DB_LOCK_NOTGRANTED</h4>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p>
|
||
The <code class="literal">DB_CONSUME_WAIT</code> flag was specified, lock or transaction timers
|
||
were configured and the lock could not be granted before the wait-time
|
||
expired.
|
||
</p>
|
||
</div>
|
||
<div class="sect3" lang="en" xml:lang="en">
|
||
<div class="titlepage">
|
||
<div>
|
||
<div>
|
||
<h4 class="title"><a id="idp57569816"></a> DB_REP_HANDLE_DEAD</h4>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p>
|
||
When a client synchronizes with the master, it is possible for committed
|
||
transactions to be rolled back. This invalidates all the database and cursor
|
||
handles opened in the replication environment. Once this occurs, an attempt to use
|
||
such a handle will
|
||
|
||
return <code class="literal">DB_REP_HANDLE_DEAD</code>.
|
||
The application will need to discard the handle and open a new one in order to
|
||
continue processing.
|
||
</p>
|
||
</div>
|
||
<div class="sect3" lang="en" xml:lang="en">
|
||
<div class="titlepage">
|
||
<div>
|
||
<div>
|
||
<h4 class="title"><a id="idp57571640"></a>DB_REP_LEASE_EXPIRED</h4>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p>
|
||
The operation failed because the site's replication master lease has expired.
|
||
</p>
|
||
</div>
|
||
<div class="sect3" lang="en" xml:lang="en">
|
||
<div class="titlepage">
|
||
<div>
|
||
<div>
|
||
<h4 class="title"><a id="idp57542992"></a>DB_REP_LOCKOUT</h4>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p>
|
||
The operation was blocked by client/master synchronization.
|
||
</p>
|
||
</div>
|
||
<div class="sect3" lang="en" xml:lang="en">
|
||
<div class="titlepage">
|
||
<div>
|
||
<div>
|
||
<h4 class="title"><a id="idp57550736"></a>DB_SECONDARY_BAD</h4>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p>
|
||
A secondary index references a nonexistent primary key.
|
||
</p>
|
||
</div>
|
||
<div class="sect3" lang="en" xml:lang="en">
|
||
<div class="titlepage">
|
||
<div>
|
||
<div>
|
||
<h4 class="title"><a id="idp57531168"></a>EINVAL</h4>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p>
|
||
If a record number of 0 was specified; the
|
||
<a class="link" href="envopen.html#envopen_DB_THREAD">DB_THREAD</a> flag was
|
||
specified to the <a class="xref" href="dbopen.html" title="DB->open()">DB->open()</a> method and none of the
|
||
<a class="link" href="dbt.html#dbt_DB_DBT_MALLOC">DB_DBT_MALLOC</a>,
|
||
<a class="link" href="dbt.html#dbt_DB_DBT_REALLOC">DB_DBT_REALLOC</a> or
|
||
<a class="link" href="dbt.html#dbt_DB_DBT_USERMEM">DB_DBT_USERMEM</a>
|
||
flags were set in the <a class="link" href="dbt.html" title="Chapter 4. The DBT Handle">DBT</a>;
|
||
the <code class="methodname">DB->pget()</code> method was called with a
|
||
<a class="link" href="db.html" title="Chapter 2. The DB Handle">DB</a> handle
|
||
that does not refer to a secondary index; or if an invalid flag value
|
||
or parameter was specified.
|
||
</p>
|
||
</div>
|
||
</div>
|
||
<div class="sect2" lang="en" xml:lang="en">
|
||
<div class="titlepage">
|
||
<div>
|
||
<div>
|
||
<h3 class="title"><a id="idp57579680"></a>Class</h3>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p>
|
||
<a class="link" href="db.html" title="Chapter 2. The DB Handle">DB</a>
|
||
</p>
|
||
</div>
|
||
<div class="sect2" lang="en" xml:lang="en">
|
||
<div class="titlepage">
|
||
<div>
|
||
<div>
|
||
<h3 class="title"><a id="idp57534808"></a>See Also</h3>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p>
|
||
<a class="xref" href="db.html#dblist" title="Database and Related Methods">Database and Related Methods</a>
|
||
</p>
|
||
</div>
|
||
</div>
|
||
<div class="navfooter">
|
||
<hr />
|
||
<table width="100%" summary="Navigation footer">
|
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<tr>
|
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<td width="40%" align="left"><a accesskey="p" href="dbfd.html">Prev</a> </td>
|
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<td width="20%" align="center">
|
||
<a accesskey="u" href="db.html">Up</a>
|
||
</td>
|
||
<td width="40%" align="right"> <a accesskey="n" href="dbget_bt_minkey.html">Next</a></td>
|
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||
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<td width="40%" align="left" valign="top">DB->fd() </td>
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<a accesskey="h" href="index.html">Home</a>
|
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|
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|
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