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Berkeley DB Extensions
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<h2 class="title" style="clear: both"><a id="ext_php"></a>Using Berkeley DB with PHP</h2>
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<p>A PHP 4 extension for this release of Berkeley DB is included in the
distribution package. It can either either link directly against the
installed Berkeley DB library (which is necessary for running in a
non-Apache/mod_php4 environment), or against mod_db4, which provides
additional safety when running under Apache/mod_php4.</p>
<p>
For installation instructions, see the <code class="filename">INSTALL</code> file that
resides in the <code class="literal">lang/php_db4</code> directory in your
Berkeley DB distribution.
</p>
<p>The PHP extension provides the following classes, which mirror the
standard Berkeley DB C++ API.</p>
<pre class="programlisting">class Db4Env {
function Db4Env($flags = 0) {}
function close($flags = 0) {}
function dbremove($txn, $filename, $database = null, $flags = 0) {}
function dbrename($txn, $file, $database, $new_database,
$flags = 0) {}
function open($home, $flags = DB_CREATE | DB_INIT_LOCK |
DB_INIT_LOG | DB_INIT_MPOOL | DB_INIT_TXN,
$mode = 0666) {}
function remove($home, $flags = 0) {}
function set_data_dir($directory) {}
function txn_begin($parent_txn = null, $flags = 0) {}
function txn_checkpoint($kbytes, $minutes, $flags = 0) {}
}
class Db4 {
function Db4($dbenv = null) {} // create a new Db4 object using
// the optional DbEnv
function open($txn = null, $file = null, $database = null,
$flags = DB_CREATE, $mode = 0) {}
function close() {}
function del($key, $txn = null) {}
function get($key, $txn = null, $flags = 0) {}
function pget($key, &$pkey, $txn = null, $flags = 0) {}
function get_type() {} // returns the stringified
// database type name
function stat($txn = null, $flags = 0) {} // returns statistics as
// an as
function join($cursor_list, $flags = 0) {}
function sync() {}
function truncate($txn = null, $flags = 0) {}
function cursor($txn = null, flags = 0) {}
}
class Db4Txn {
function abort() {}
function commit() {}
function discard() {}
function id() {}
function set_timeout($timeout, $flags = 0) {}
}
class Db4Cursor {
function close() {}
function count() {}
function del() {}
function dup($flags = 0) {}
function get($key, $flags = 0) {}
function pget($key, &$primary_key, $flags = 0) {}
function put($key, $data, $flags = 0) {}
}</pre>
<p>The PHP extension attempts to be "smart" for you by:</p>
<div class="orderedlist">
<ol type="1">
<li>Auto-committing operations on transactional databases if no explicit
Db4Txn object is specified.</li>
<li>Performing reference and dependency checking to insure that all
resources are closed in the correct order.</li>
<li>Supplying default values for flags.</li>
</ol>
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