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<title>mod_dbd - Apache HTTP Server</title>
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
<p class="apache">Apache HTTP Server Version 2.1</p>
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs-project/">Documentation</a> > <a href="../">Version 2.1</a> > <a href="./">Modules</a></div>
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</div>
<div id="quickview"><h3 class="directives">Directives</h3>
<ul id="toc">
-<li><img
alt="" src="../images/down.gif" /> <a href="#dbdexptime">DBDExptime</a></li>
-<li><img
alt="" src="../images/down.gif" /> <a href="#dbdkeep">DBDKeep</a></li>
-<li><img
alt="" src="../images/down.gif" /> <a href="#dbdmax">DBDMax</a></li>
-<li><img
alt="" src="../images/down.gif" /> <a href="#dbdmin">DBDMin</a></li>
-<li><img
alt="" src="../images/down.gif" /> <a href="#dbdparams">DBDParams</a></li>
-<li><img
alt="" src="../images/down.gif" /> <a href="#dbdpersist">DBDPersist</a></li>
-<li><img
alt="" src="../images/down.gif" /> <a href="#dbdpreparesql">DBDPrepareSQL</a></li>
-<li><img
alt="" src="../images/down.gif" /> <a href="#dbdriver">DBDriver</a></li>
+<li><img
src="../images/down.gif" alt="" /> <a href="#dbdexptime">DBDExptime</a></li>
+<li><img
src="../images/down.gif" alt="" /> <a href="#dbdkeep">DBDKeep</a></li>
+<li><img
src="../images/down.gif" alt="" /> <a href="#dbdmax">DBDMax</a></li>
+<li><img
src="../images/down.gif" alt="" /> <a href="#dbdmin">DBDMin</a></li>
+<li><img
src="../images/down.gif" alt="" /> <a href="#dbdparams">DBDParams</a></li>
+<li><img
src="../images/down.gif" alt="" /> <a href="#dbdpersist">DBDPersist</a></li>
+<li><img
src="../images/down.gif" alt="" /> <a href="#dbdpreparesql">DBDPrepareSQL</a></li>
+<li><img
src="../images/down.gif" alt="" /> <a href="#dbdriver">DBDriver</a></li>
</ul>
<h3>Topics</h3>
<ul id="topics">
-<li><img
alt="" src="../images/down.gif" /> <a href="#pooling">Connection Pooling</a></li>
-<li><img
alt="" src="../images/down.gif" /> <a href="#API">Apache DBD API</a></li>
-<li><img
alt="" src="../images/down.gif" /> <a href="#prepared">SQL Prepared Statements</a></li>
+<li><img
src="../images/down.gif" alt="" /> <a href="#pooling">Connection Pooling</a></li>
+<li><img
src="../images/down.gif" alt="" /> <a href="#API">Apache DBD API</a></li>
+<li><img
src="../images/down.gif" alt="" /> <a href="#prepared">SQL Prepared Statements</a></li>
</ul></div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
<div class="section">
-<h2><a name="pooling" id="pooling">Connection Pooling</a></h2>
+<h2><a id="pooling" name="pooling">Connection Pooling</a></h2>
<p>This module manages database connections, in a manner
optimised for the platform. On non-threaded platforms,
it provides a persistent connection in the manner of
scalable and efficient <em>connection pool</em>, as
described in <a href="http://www.apachetutor.org/dev/reslist">this article at ApacheTutor</a>. <code class="module"><a href="../mod/mod_dbd.html">mod_dbd</a></code> supersedes
the modules presented in that article.</p>
-</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
<div class="section">
-<h2><a name="API" id="API">Apache DBD API</a></h2>
- <p><code class="module"><a href="../mod/mod_dbd.html">mod_dbd</a></code> exports four functions for other modules
+<h2><a id="API" name="API">Apache DBD API</a></h2>
+ <p><code class="module"><a href="../mod/mod_dbd.html">mod_dbd</a></code> exports five functions for other modules
to use. The API is as follows:</p>
<div class="example"><pre><code>typedef struct {
*/
AP_DECLARE(ap_dbd_t*) ap_dbd_acquire(request_rec*);
+/* acquire a connection that will have the lifetime of a connection
+ * and MUST NOT be explicitly closed. Return NULL on error.
+ */
+AP_DECLARE(ap_dbd_t*) ap_dbd_cacquire(request_rec*);
+
/* Prepare a statement for use by a client module */
AP_DECLARE(void) ap_dbd_prepare(server_rec*, const char*, const char*);
/* Also export them as optional functions for modules that prefer it */
APR_DECLARE_OPTIONAL_FN(ap_dbd_t*, ap_dbd_open, (apr_pool_t*, server_rec*));
APR_DECLARE_OPTIONAL_FN(void, ap_dbd_close, (server_rec*, ap_dbd_t*));
-APR_DECLARE_OPTIONAL_FN(ap_dbd_t*, ap_dbd_acquire, (request_rec*));</code></pre><p><code>
+APR_DECLARE_OPTIONAL_FN(ap_dbd_t*, ap_dbd_acquire, (request_rec*));
+APR_DECLARE_OPTIONAL_FN(ap_dbd_t*, ap_dbd_cacquire, (conn_rec*));
APR_DECLARE_OPTIONAL_FN(void, ap_dbd_prepare, (server_rec*, const char*, const char*));
- </code></p></div>
-</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+</code></pre></div>
+</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
<div class="section">
-<h2><a name="prepared" id="prepared">SQL Prepared Statements</a></h2>
+<h2><a id="prepared" name="prepared">SQL Prepared Statements</a></h2>
<p><code class="module"><a href="../mod/mod_dbd.html">mod_dbd</a></code> supports SQL prepared statements on behalf
of modules that may wish to use them. Each prepared statement
must be assigned a name (label), and they are stored in a hash:
and document what statements can be specified in httpd.conf,
or to provide their own directives and use <code>ap_dbd_prepare</code>.</p>
</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="DBDExptime" id="DBDExptime">DBDExptime</a> <a name="dbdexptime" id="dbdexptime">Directive</a></h2>
+<div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
+<div class="directive-section"><h2><a id="DBDExptime" name="DBDExptime">DBDExptime</a> <a id="dbdexptime" name="dbdexptime">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Keepalive time for idle connections</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DBDExptime <var>time-in-seconds</var></code></td></tr>
platforms only).</p>
</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="DBDKeep" id="DBDKeep">DBDKeep</a> <a name="dbdkeep" id="dbdkeep">Directive</a></h2>
+<div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
+<div class="directive-section"><h2><a id="DBDKeep" name="DBDKeep">DBDKeep</a> <a id="dbdkeep" name="dbdkeep">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum sustainednumber of connections</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DBDKeep <var>number</var></code></td></tr>
platforms only).</p>
</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="DBDMax" id="DBDMax">DBDMax</a> <a name="dbdmax" id="dbdmax">Directive</a></h2>
+<div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
+<div class="directive-section"><h2><a id="DBDMax" name="DBDMax">DBDMax</a> <a id="dbdmax" name="dbdmax">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum number of connections</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DBDMax <var>number</var></code></td></tr>
(threaded platforms only).</p>
</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="DBDMin" id="DBDMin">DBDMin</a> <a name="dbdmin" id="dbdmin">Directive</a></h2>
+<div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
+<div class="directive-section"><h2><a id="DBDMin" name="DBDMin">DBDMin</a> <a id="dbdmin" name="dbdmin">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Minimum number of connections</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DBDMin <var>number</var></code></td></tr>
platforms only).</p>
</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="DBDParams" id="DBDParams">DBDParams</a> <a name="dbdparams" id="dbdparams">Directive</a></h2>
+<div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
+<div class="directive-section"><h2><a id="DBDParams" name="DBDParams">DBDParams</a> <a id="dbdparams" name="dbdparams">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Parameters for database connection</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DBDParams
password, database name, hostname and port number for connection.</p>
</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="DBDPersist" id="DBDPersist">DBDPersist</a> <a name="dbdpersist" id="dbdpersist">Directive</a></h2>
+<div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
+<div class="directive-section"><h2><a id="DBDPersist" name="DBDPersist">DBDPersist</a> <a id="dbdpersist" name="dbdpersist">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Whether to use persistent connections</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DBDPersist 0|1</code></td></tr>
non-threaded server), and should almost always be used in operation.</p>
</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="DBDPrepareSQL" id="DBDPrepareSQL">DBDPrepareSQL</a> <a name="dbdpreparesql" id="dbdpreparesql">Directive</a></h2>
+<div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
+<div class="directive-section"><h2><a id="DBDPrepareSQL" name="DBDPrepareSQL">DBDPrepareSQL</a> <a id="dbdpreparesql" name="dbdpreparesql">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Define an SQL prepared statement</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DBDPrepareSQL <var>"SQL statement"</var> <var>label</var></code></td></tr>
This directive prepares an SQL statement and assigns it a label.</p>
</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="DBDriver" id="DBDriver">DBDriver</a> <a name="dbdriver" id="dbdriver">Directive</a></h2>
+<div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
+<div class="directive-section"><h2><a id="DBDriver" name="DBDriver">DBDriver</a> <a id="dbdriver" name="dbdriver">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Specify an SQL driver</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DBDriver <var>name</var></code></td></tr>
</div><div id="footer">
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