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AphrontMySQLDatabaseConnection.php
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Wed, Jan 8, 00:07

AphrontMySQLDatabaseConnection.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
*/
class AphrontMySQLDatabaseConnection extends AphrontDatabaseConnection {
private $config;
private $connection;
public function __construct(array $configuration) {
$this->configuration = $configuration;
}
public function escapeString($string) {
if (!$this->connection) {
$this->establishConnection();
}
return mysql_real_escape_string($string, $this->connection);
}
public function escapeColumnName($name) {
return '`'.str_replace('`', '\\`', $name).'`';
}
public function escapeMultilineComment($comment) {
// These can either terminate a comment, confuse the hell out of the parser,
// make MySQL execute the comment as a query, or, in the case of semicolon,
// are quasi-dangerous because the semicolon could turn a broken query into
// a working query plus an ignored query.
static $map = array(
'--' => '(DOUBLEDASH)',
'*/' => '(STARSLASH)',
'//' => '(SLASHSLASH)',
'#' => '(HASH)',
'!' => '(BANG)',
';' => '(SEMICOLON)',
);
$comment = str_replace(
array_keys($map),
array_values($map),
$comment);
// For good measure, kill anything else that isn't a nice printable
// character.
$comment = preg_replace('/[^\x20-\x7F]+/', ' ', $comment);
return '/* '.$comment.' */';
}
public function escapeStringForLikeClause($value) {
$value = $this->escapeString($value);
// Ideally the query shouldn't be modified after safely escaping it,
// but we need to escape _ and % within LIKE terms.
$value = str_replace(
// Even though we've already escaped, we need to replace \ with \\
// because MYSQL unescapes twice inside a LIKE clause. See note
// at mysql.com. However, if the \ is being used to escape a single
// quote ('), then the \ should not be escaped. Thus, after all \
// are replaced with \\, we need to revert instances of \\' back to
// \'.
array('\\', '\\\\\'', '_', '%'),
array('\\\\', '\\\'', '\_', '\%'),
$value);
return $value;
}
private function getConfiguration($key, $default = null) {
return idx($this->configuration, $key, $default);
}
private function establishConnection() {
$this->connection = null;
$user = $this->getConfiguration('user');
$host = $this->getConfiguration('host');
$conn = @mysql_connect(
$host,
$user,
$this->getConfiguration('pass'),
$new_link = true,
$flags = 0);
if (!$conn) {
$errno = mysql_errno();
$error = mysql_error();
throw new AphrontQueryConnectionException(
"Attempt to connect to {$user}@{$host} failed with error #{$errno}: ".
"{$error}.");
}
$ret = @mysql_select_db($this->getConfiguration('database'), $conn);
if (!$ret) {
$this->throwQueryException($conn);
}
$this->connection = $conn;
}
public function getInsertID() {
return mysql_insert_id($this->requireConnection());
}
public function getAffectedRows() {
return mysql_affected_rows($this->requireConnection());
}
public function getTransactionKey() {
return (int)$this->requireConnection();
}
private function requireConnection() {
if (!$this->connection) {
$this->establishConnection();
}
return $this->connection;
}
public function selectAllResults() {
$result = array();
$res = $this->lastResult;
if ($res == null) {
throw new Exception('No query result to fetch from!');
}
while (($row = mysql_fetch_assoc($res)) !== false) {
$result[] = $row;
}
return $result;
}
public function executeRawQuery($raw_query) {
$this->lastResult = null;
$retries = 3;
while ($retries--) {
try {
if (!$this->connection) {
$this->establishConnection();
}
$result = mysql_query($raw_query, $this->connection);
if ($result) {
$this->lastResult = $result;
break;
}
$this->throwQueryException($this->connection);
} catch (AphrontQueryConnectionLostException $ex) {
if (!$retries) {
throw $ex;
}
if ($this->isInsideTransaction()) {
throw $ex;
}
$this->connection = null;
}
}
}
private function throwQueryException($connection) {
$errno = mysql_errno($connection);
$error = mysql_error($connection);
switch ($errno) {
case 2013: // Connection Dropped
case 2006: // Gone Away
throw new AphrontQueryConnectionLostException("#{$errno}: {$error}");
break;
case 1213: // Deadlock
case 1205: // Lock wait timeout exceeded
throw new AphrontQueryRecoverableException("#{$errno}: {$error}");
break;
default:
// TODO: 1062 is syntax error, and quite terrible in production.
throw new AphrontQueryException("#{$errno}: {$error}");
}
}
}

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