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AphrontDatabaseConnection.php
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Thu, Nov 7, 11:19

AphrontDatabaseConnection.php
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<?php
/*
* Copyright 2011 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @group storage
*/
abstract class AphrontDatabaseConnection {
private static $transactionStacks = array();
private static $transactionShutdownRegistered = false;
abstract public function getInsertID();
abstract public function getAffectedRows();
abstract public function selectAllResults();
abstract public function executeRawQuery($raw_query);
abstract protected function getTransactionKey();
abstract public function escapeString($string);
abstract public function escapeColumnName($string);
abstract public function escapeMultilineComment($string);
abstract public function escapeStringForLikeClause($string);
public function queryData($pattern/*, $arg, $arg, ... */) {
$args = func_get_args();
array_unshift($args, $this);
return call_user_func_array('queryfx_all', $args);
}
public function query($pattern/*, $arg, $arg, ... */) {
$args = func_get_args();
array_unshift($args, $this);
return call_user_func_array('queryfx', $args);
}
// TODO: Probably need to reset these when we catch a connection exception
// in the transaction stack.
protected function &getLockLevels() {
static $levels = array();
$key = $this->getTransactionKey();
if (!isset($levels[$key])) {
$levels[$key] = array(
'read' => 0,
'write' => 0,
);
}
return $levels[$key];
}
public function isReadLocking() {
$levels = &$this->getLockLevels();
return ($levels['read'] > 0);
}
public function isWriteLocking() {
$levels = &$this->getLockLevels();
return ($levels['write'] > 0);
}
public function startReadLocking() {
$levels = &$this->getLockLevels();
++$levels['read'];
return $this;
}
public function startWriteLocking() {
$levels = &$this->getLockLevels();
++$levels['write'];
return $this;
}
public function stopReadLocking() {
$levels = &$this->getLockLevels();
if ($levels['read'] < 1) {
throw new Exception('Unable to stop read locking: not read locking.');
}
--$levels['read'];
return $this;
}
public function stopWriteLocking() {
$levels = &$this->getLockLevels();
if ($levels['write'] < 1) {
throw new Exception('Unable to stop read locking: not write locking.');
}
--$levels['write'];
return $this;
}
protected function &getTransactionStack($key) {
if (!self::$transactionShutdownRegistered) {
self::$transactionShutdownRegistered = true;
register_shutdown_function(
array(
'AphrontDatabaseConnection',
'shutdownTransactionStacks',
));
}
if (!isset(self::$transactionStacks[$key])) {
self::$transactionStacks[$key] = array();
}
return self::$transactionStacks[$key];
}
public static function shutdownTransactionStacks() {
foreach (self::$transactionStacks as $stack) {
if ($stack === false) {
continue;
}
$count = count($stack);
if ($count) {
throw new Exception(
'Script exited with '.$count.' open transactions! The '.
'transactions will be implicitly rolled back. Calls to '.
'openTransaction() should always be paired with a call to '.
'saveTransaction() or killTransaction(); you have an unpaired '.
'call somewhere.',
$count);
}
}
}
public function openTransaction() {
$key = $this->getTransactionKey();
$stack = &$this->getTransactionStack($key);
$new_transaction = !count($stack);
// TODO: At least in development, push context information instead of
// `true' so we can report (or, at least, guess) where unpaired
// transaction calls happened.
$stack[] = true;
end($stack);
$key = key($stack);
if ($new_transaction) {
$this->query('START TRANSACTION');
} else {
$this->query('SAVEPOINT '.$this->getSavepointName($key));
}
}
public function isInsideTransaction() {
$key = $this->getTransactionKey();
$stack = &$this->getTransactionStack($key);
return (bool)count($stack);
}
public function saveTransaction() {
$key = $this->getTransactionKey();
$stack = &$this->getTransactionStack($key);
if (!count($stack)) {
throw new Exception(
"No open transaction! Unable to save transaction, since there ".
"isn't one.");
}
array_pop($stack);
if (!count($stack)) {
$this->query('COMMIT');
}
}
public function saveTransactionUnless($cond) {
if ($cond) {
$this->killTransaction();
} else {
$this->saveTransaction();
}
}
public function saveTransactionIf($cond) {
$this->saveTransactionUnless(!$cond);
}
public function killTransaction() {
$key = $this->getTransactionKey();
$stack = &$this->getTransactionStack($key);
if (!count($stack)) {
throw new Exception(
"No open transaction! Unable to kill transaction, since there ".
"isn't one.");
}
$count = count($stack);
end($stack);
$key = key($stack);
array_pop($stack);
if (!count($stack)) {
$this->query('ROLLBACK');
} else {
$this->query(
'ROLLBACK TO SAVEPOINT '.$this->getSavepointName($key)
);
}
}
protected function getSavepointName($key) {
return 'LiskSavepoint_'.$key;
}
}

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