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AphrontDatabaseConnection.php
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Tue, May 6, 05:26

AphrontDatabaseConnection.php
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<?php
/*
* Copyright 2012 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.
*/
/**
* @task xaction Transaction Management
* @group storage
*/
abstract class AphrontDatabaseConnection {
private static $transactionStates = array();
private $initializingTransactionState;
abstract public function getInsertID();
abstract public function getAffectedRows();
abstract public function selectAllResults();
abstract public function executeRawQuery($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);
}
/* -( Transaction Management )--------------------------------------------- */
/**
* Begin a transaction, or set a savepoint if the connection is already
* transactional.
*
* @return this
* @task xaction
*/
public function openTransaction() {
$state = $this->getTransactionState();
$point = $state->getSavepointName();
$depth = $state->increaseDepth();
$new_transaction = ($depth == 1);
if ($new_transaction) {
$this->query('START TRANSACTION');
} else {
$this->query('SAVEPOINT '.$point);
}
return $this;
}
/**
* Commit a transaction, or stage a savepoint for commit once the entire
* transaction completes if inside a transaction stack.
*
* @return this
* @task xaction
*/
public function saveTransaction() {
$state = $this->getTransactionState();
$depth = $state->decreaseDepth();
if ($depth == 0) {
$this->query('COMMIT');
}
return $this;
}
/**
* Rollback a transaction, or unstage the last savepoint if inside a
* transaction stack.
*
* @return this
*/
public function killTransaction() {
$state = $this->getTransactionState();
$depth = $state->decreaseDepth();
if ($depth == 0) {
$this->query('ROLLBACK');
} else {
$this->query('ROLLBACK TO SAVEPOINT '.$state->getSavepointName());
}
return $this;
}
/**
* Returns true if the connection is transactional.
*
* @return bool True if the connection is currently transactional.
* @task xaction
*/
public function isInsideTransaction() {
if ($this->initializingTransactionState) {
return false;
}
$state = $this->getTransactionState();
return ($state->getDepth() > 0);
}
/**
* Get the current @{class:AphrontDatabaseTransactionState} object, or create
* one if none exists.
*
* @return AphrontDatabaseTransactionState Current transaction state.
* @task xaction
*/
protected function getTransactionState() {
// Establishing a connection may be required to get the transaction key,
// and may also perform a test for transaction state. While establishing
// transaction state, avoid infinite recursion.
$this->initializingTransactionState = true;
$key = $this->getTransactionKey();
if (empty(self::$transactionStates[$key])) {
self::$transactionStates[$key] = new AphrontDatabaseTransactionState();
}
$this->initializingTransactionState = false;
return self::$transactionStates[$key];
}
}

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