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<?php rcs_id('$Id: DbaDatabase.php,v 1.21 2006/09/06 05:42:54 rurban Exp $');
require_once('lib/ErrorManager.php');
define('DBA_DATABASE_DEFAULT_TIMEOUT', 5);
class DbaDatabase
{
function DbaDatabase($filename, $mode = false, $handler = 'gdbm') {
$this->_file = $filename;
$this->_handler = $handler;
$this->_timeout = DBA_DATABASE_DEFAULT_TIMEOUT;
$this->_dbh = false;
if (function_exists("dba_handlers")) { // since 4.3.0
if (!in_array($handler, dba_handlers()))
$this->_error(
sprintf(
_("The DBA handler %s is unsupported!")."\n".
_("Supported handlers are: %s"),
$handler, join(",",dba_handlers())));
}
if ($mode)
$this->open($mode);
}
function set_timeout($timeout) {
$this->_timeout = $timeout;
}
function open($mode = 'w') {
if ($this->_dbh)
return; // already open.
$watchdog = $this->_timeout;
global $ErrorManager;
$this->_dba_open_error = false;
$ErrorManager->pushErrorHandler(new WikiMethodCb($this, '_dba_open_error_handler'));
// oops, you don't have DBA support.
if (!function_exists("dba_open")) {
echo "You don't seem to have DBA support compiled into PHP.";
}
// lock supported since 4.3.0:
if (check_php_version(4,3,0) and (strlen($mode) == 1)) {
// PHP 4.3.x Windows lock bug workaround: http://bugs.php.net/bug.php?id=23975
if (isWindows()) {
$mode .= "-"; // suppress locking, or
} elseif ($this->_handler != 'gdbm') { // gdbm does it internally
$mode .= "d"; // else use internal locking
}
}
while (($dbh = dba_open($this->_file, $mode, $this->_handler)) < 1) {
if ($watchdog <= 0)
break;
flush();
// "c" failed, try "w" instead.
if (substr($mode,0,1) == "c" and file_exists($this->_file))
$mode = "w";
// conflict: wait some random time to unlock (see ethernet)
$secs = 0.5 + ((double)rand(1,32767)/32767);
sleep($secs);
$watchdog -= $secs;
if (strlen($mode) == 2) $mode = substr($mode,0,-1);
}
$ErrorManager->popErrorHandler();
if (!$dbh) {
if ( ($error = $this->_dba_open_error) ) {
$error->errno = E_USER_ERROR;
$error->errstr .= "\nfile: " . $this->_file
. "\nmode: " . $mode
. "\nhandler: " . $this->_handler;
$ErrorManager->handleError($error);
}
else {
trigger_error("dba_open failed", E_USER_ERROR);
}
}
$this->_dbh = $dbh;
return !empty($dbh);
}
function close() {
if ($this->_dbh)
dba_close($this->_dbh);
$this->_dbh = false;
}
function exists($key) {
return dba_exists($key, $this->_dbh);
}
function fetch($key) {
$val = dba_fetch($key, $this->_dbh);
if ($val === false)
return $this->_error("fetch($key)");
return $val;
}
function insert($key, $val) {
if (!dba_insert($key, $val, $this->_dbh))
return $this->_error("insert($key)");
}
function replace($key, $val) {
if (!dba_replace($key, $val, $this->_dbh))
return $this->_error("replace($key)");
}
function firstkey() {
return dba_firstkey($this->_dbh);
}
function nextkey() {
return dba_nextkey($this->_dbh);
}
function delete($key) {
if (!dba_delete($key, $this->_dbh))
return $this->_error("delete($key)");
}
function get($key) {
return dba_fetch($key, $this->_dbh);
}
function set($key, $val) {
$dbh = &$this->_dbh;
if (dba_exists($key, $dbh)) {
if ($val !== false) {
if (!dba_replace($key, $val, $dbh))
return $this->_error("store[replace]($key)");
}
else {
if (!dba_delete($key, $dbh))
return $this->_error("store[delete]($key)");
}
}
else {
if (!dba_insert($key, $val, $dbh))
return $this->_error("store[insert]($key)");
}
}
function sync() {
if (!dba_sync($this->_dbh))
return $this->_error("sync()");
}
function optimize() {
if (!dba_optimize($this->_dbh))
return $this->_error("optimize()");
return 1;
}
function _error($mes) {
//trigger_error("DbaDatabase: $mes", E_USER_WARNING);
//return false;
trigger_error("$this->_file: dba error: $mes", E_USER_ERROR);
}
function _dump() {
$dbh = &$this->_dbh;
for ($key = $this->firstkey($dbh); $key; $key = $this->nextkey($dbh))
printf("%10s: %s\n", $key, $this->fetch($key));
}
function _dba_open_error_handler($error) {
$this->_dba_open_error = $error;
return true;
}
}
// $Log: DbaDatabase.php,v $
// Revision 1.21 2006/09/06 05:42:54 rurban
// unify dbh arg
//
// Revision 1.20 2006/08/15 13:35:33 rurban
// just aesthetics
//
// Revision 1.19 2006/06/18 11:01:25 rurban
// add rcsid log
//
// (c-file-style: "gnu")
// Local Variables:
// mode: php
// tab-width: 8
// c-basic-offset: 4
// c-hanging-comment-ender-p: nil
// indent-tabs-mode: nil
// End:
?>
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