mysql.php
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<?php
/**
* @package Joomla.Platform
* @subpackage Database
*
* @copyright Copyright (C) 2005 - 2019 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* MySQL database driver
*
* @link https://dev.mysql.com/doc/
* @since 3.0.0
* @deprecated 4.0 Use MySQLi or PDO MySQL instead
*/
class JDatabaseDriverMysql extends JDatabaseDriverMysqli
{
/**
* The name of the database driver.
*
* @var string
* @since 3.0.0
*/
public $name = 'mysql';
/**
* Constructor.
*
* @param array $options Array of database options with keys: host, user, password, database, select.
*
* @since 3.0.0
*/
public function __construct($options)
{
// PHP's `mysql` extension is not present in PHP 7, block instantiation in this environment
if (PHP_MAJOR_VERSION >= 7)
{
throw new JDatabaseExceptionUnsupported(
'This driver is unsupported in PHP 7, please use the MySQLi or PDO MySQL driver instead.'
);
}
// Get some basic values from the options.
$options['host'] = (isset($options['host'])) ? $options['host'] : 'localhost';
$options['user'] = (isset($options['user'])) ? $options['user'] : '';
$options['password'] = (isset($options['password'])) ? $options['password'] : '';
$options['database'] = (isset($options['database'])) ? $options['database'] : '';
$options['select'] = (isset($options['select'])) ? (bool) $options['select'] : true;
// Finalize initialisation.
parent::__construct($options);
}
/**
* Connects to the database if needed.
*
* @return void Returns void if the database connected successfully.
*
* @since 3.0.0
* @throws RuntimeException
*/
public function connect()
{
if ($this->connection)
{
return;
}
// Make sure the MySQL extension for PHP is installed and enabled.
if (!self::isSupported())
{
throw new JDatabaseExceptionUnsupported('Make sure the MySQL extension for PHP is installed and enabled.');
}
// Attempt to connect to the server.
if (!($this->connection = @ mysql_connect($this->options['host'], $this->options['user'], $this->options['password'], true)))
{
throw new JDatabaseExceptionConnecting('Could not connect to MySQL server.');
}
// Set sql_mode to non_strict mode
mysql_query("SET @@SESSION.sql_mode = '';", $this->connection);
// If auto-select is enabled select the given database.
if ($this->options['select'] && !empty($this->options['database']))
{
$this->select($this->options['database']);
}
// Pre-populate the UTF-8 Multibyte compatibility flag based on server version
$this->utf8mb4 = $this->serverClaimsUtf8mb4Support();
// Set the character set (needed for MySQL 4.1.2+).
$this->utf = $this->setUtf();
// Disable query cache and turn profiling ON in debug mode.
if ($this->debug)
{
mysql_query('SET query_cache_type = 0;', $this->connection);
if ($this->hasProfiling())
{
mysql_query('SET profiling_history_size = 100, profiling = 1;', $this->connection);
}
}
}
/**
* Disconnects the database.
*
* @return void
*
* @since 3.0.0
*/
public function disconnect()
{
// Close the connection.
if (is_resource($this->connection))
{
foreach ($this->disconnectHandlers as $h)
{
call_user_func_array($h, array( &$this));
}
mysql_close($this->connection);
}
$this->connection = null;
}
/**
* Method to escape a string for usage in an SQL statement.
*
* @param string $text The string to be escaped.
* @param boolean $extra Optional parameter to provide extra escaping.
*
* @return string The escaped string.
*
* @since 3.0.0
*/
public function escape($text, $extra = false)
{
if (is_int($text))
{
return $text;
}
if (is_float($text))
{
// Force the dot as a decimal point.
return str_replace(',', '.', $text);
}
$this->connect();
$result = mysql_real_escape_string($text, $this->getConnection());
if ($extra)
{
$result = addcslashes($result, '%_');
}
return $result;
}
/**
* Test to see if the MySQL connector is available.
*
* @return boolean True on success, false otherwise.
*
* @since 3.0.0
*/
public static function isSupported()
{
return PHP_MAJOR_VERSION < 7 && function_exists('mysql_connect');
}
/**
* Determines if the connection to the server is active.
*
* @return boolean True if connected to the database engine.
*
* @since 3.0.0
*/
public function connected()
{
if (is_resource($this->connection))
{
return @mysql_ping($this->connection);
}
return false;
}
/**
* Get the number of affected rows by the last INSERT, UPDATE, REPLACE or DELETE for the previous executed SQL statement.
*
* @return integer The number of affected rows.
*
* @since 3.0.0
*/
public function getAffectedRows()
{
$this->connect();
return mysql_affected_rows($this->connection);
}
/**
* Get the number of returned rows for the previous executed SQL statement.
* This command is only valid for statements like SELECT or SHOW that return an actual result set.
* To retrieve the number of rows affected by an INSERT, UPDATE, REPLACE or DELETE query, use getAffectedRows().
*
* @param resource $cursor An optional database cursor resource to extract the row count from.
*
* @return integer The number of returned rows.
*
* @since 3.0.0
*/
public function getNumRows($cursor = null)
{
$this->connect();
return mysql_num_rows($cursor ? $cursor : $this->cursor);
}
/**
* Get the version of the database connector.
*
* @return string The database connector version.
*
* @since 3.0.0
*/
public function getVersion()
{
$this->connect();
return mysql_get_server_info($this->connection);
}
/**
* Method to get the auto-incremented value from the last INSERT statement.
*
* @return integer The value of the auto-increment field from the last inserted row.
*
* @since 3.0.0
*/
public function insertid()
{
$this->connect();
return mysql_insert_id($this->connection);
}
/**
* Execute the SQL statement.
*
* @return mixed A database cursor resource on success, boolean false on failure.
*
* @since 3.0.0
* @throws RuntimeException
*/
public function execute()
{
$this->connect();
// Take a local copy so that we don't modify the original query and cause issues later
$query = $this->replacePrefix((string) $this->sql);
if (!($this->sql instanceof JDatabaseQuery) && ($this->limit > 0 || $this->offset > 0))
{
$query .= ' LIMIT ' . $this->offset . ', ' . $this->limit;
}
if (!is_resource($this->connection))
{
JLog::add(JText::sprintf('JLIB_DATABASE_QUERY_FAILED', $this->errorNum, $this->errorMsg), JLog::ERROR, 'database');
throw new JDatabaseExceptionExecuting($query, $this->errorMsg, $this->errorNum);
}
// Increment the query counter.
$this->count++;
// Reset the error values.
$this->errorNum = 0;
$this->errorMsg = '';
// If debugging is enabled then let's log the query.
if ($this->debug)
{
// Add the query to the object queue.
$this->log[] = $query;
JLog::add($query, JLog::DEBUG, 'databasequery');
$this->timings[] = microtime(true);
}
// Execute the query. Error suppression is used here to prevent warnings/notices that the connection has been lost.
$this->cursor = @mysql_query($query, $this->connection);
if ($this->debug)
{
$this->timings[] = microtime(true);
if (defined('DEBUG_BACKTRACE_IGNORE_ARGS'))
{
$this->callStacks[] = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
}
else
{
$this->callStacks[] = debug_backtrace();
}
}
// If an error occurred handle it.
if (!$this->cursor)
{
// Get the error number and message before we execute any more queries.
$this->errorNum = $this->getErrorNumber();
$this->errorMsg = $this->getErrorMessage();
// Check if the server was disconnected.
if (!$this->connected())
{
try
{
// Attempt to reconnect.
$this->connection = null;
$this->connect();
}
// If connect fails, ignore that exception and throw the normal exception.
catch (RuntimeException $e)
{
// Get the error number and message.
$this->errorNum = $this->getErrorNumber();
$this->errorMsg = $this->getErrorMessage();
// Throw the normal query exception.
JLog::add(JText::sprintf('JLIB_DATABASE_QUERY_FAILED', $this->errorNum, $this->errorMsg), JLog::ERROR, 'database-error');
throw new JDatabaseExceptionExecuting($query, $this->errorMsg, $this->errorNum, $e);
}
// Since we were able to reconnect, run the query again.
return $this->execute();
}
// The server was not disconnected.
else
{
// Throw the normal query exception.
JLog::add(JText::sprintf('JLIB_DATABASE_QUERY_FAILED', $this->errorNum, $this->errorMsg), JLog::ERROR, 'database-error');
throw new JDatabaseExceptionExecuting($query, $this->errorMsg, $this->errorNum);
}
}
return $this->cursor;
}
/**
* Select a database for use.
*
* @param string $database The name of the database to select for use.
*
* @return boolean True if the database was successfully selected.
*
* @since 3.0.0
* @throws RuntimeException
*/
public function select($database)
{
$this->connect();
if (!$database)
{
return false;
}
if (!mysql_select_db($database, $this->connection))
{
throw new JDatabaseExceptionConnecting('Could not connect to MySQL database.');
}
return true;
}
/**
* Set the connection to use UTF-8 character encoding.
*
* @return boolean True on success.
*
* @since 3.0.0
*/
public function setUtf()
{
// If UTF is not supported return false immediately
if (!$this->utf)
{
return false;
}
// Make sure we're connected to the server
$this->connect();
// Which charset should I use, plain utf8 or multibyte utf8mb4?
$charset = $this->utf8mb4 ? 'utf8mb4' : 'utf8';
$result = @mysql_set_charset($charset, $this->connection);
/**
* If I could not set the utf8mb4 charset then the server doesn't support utf8mb4 despite claiming otherwise.
* This happens on old MySQL server versions (less than 5.5.3) using the mysqlnd PHP driver. Since mysqlnd
* masks the server version and reports only its own we can not be sure if the server actually does support
* UTF-8 Multibyte (i.e. it's MySQL 5.5.3 or later). Since the utf8mb4 charset is undefined in this case we
* catch the error and determine that utf8mb4 is not supported!
*/
if (!$result && $this->utf8mb4)
{
$this->utf8mb4 = false;
$result = @mysql_set_charset('utf8', $this->connection);
}
return $result;
}
/**
* Method to fetch a row from the result set cursor as an array.
*
* @param mixed $cursor The optional result set cursor from which to fetch the row.
*
* @return mixed Either the next row from the result set or false if there are no more rows.
*
* @since 3.0.0
*/
protected function fetchArray($cursor = null)
{
return mysql_fetch_row($cursor ? $cursor : $this->cursor);
}
/**
* Method to fetch a row from the result set cursor as an associative array.
*
* @param mixed $cursor The optional result set cursor from which to fetch the row.
*
* @return mixed Either the next row from the result set or false if there are no more rows.
*
* @since 3.0.0
*/
protected function fetchAssoc($cursor = null)
{
return mysql_fetch_assoc($cursor ? $cursor : $this->cursor);
}
/**
* Method to fetch a row from the result set cursor as an object.
*
* @param mixed $cursor The optional result set cursor from which to fetch the row.
* @param string $class The class name to use for the returned row object.
*
* @return mixed Either the next row from the result set or false if there are no more rows.
*
* @since 3.0.0
*/
protected function fetchObject($cursor = null, $class = 'stdClass')
{
return mysql_fetch_object($cursor ? $cursor : $this->cursor, $class);
}
/**
* Method to free up the memory used for the result set.
*
* @param mixed $cursor The optional result set cursor from which to fetch the row.
*
* @return void
*
* @since 3.0.0
*/
protected function freeResult($cursor = null)
{
mysql_free_result($cursor ? $cursor : $this->cursor);
}
/**
* Internal function to check if profiling is available
*
* @return boolean
*
* @since 3.1.3
*/
private function hasProfiling()
{
try
{
$res = mysql_query("SHOW VARIABLES LIKE 'have_profiling'", $this->connection);
$row = mysql_fetch_assoc($res);
return isset($row);
}
catch (Exception $e)
{
return false;
}
}
/**
* Does the database server claim to have support for UTF-8 Multibyte (utf8mb4) collation?
*
* libmysql supports utf8mb4 since 5.5.3 (same version as the MySQL server). mysqlnd supports utf8mb4 since 5.0.9.
*
* @return boolean
*
* @since CMS 3.5.0
*/
private function serverClaimsUtf8mb4Support()
{
$client_version = mysql_get_client_info();
$server_version = $this->getVersion();
if (version_compare($server_version, '5.5.3', '<'))
{
return false;
}
else
{
if (strpos($client_version, 'mysqlnd') !== false)
{
$client_version = preg_replace('/^\D+([\d.]+).*/', '$1', $client_version);
return version_compare($client_version, '5.0.9', '>=');
}
else
{
return version_compare($client_version, '5.5.3', '>=');
}
}
}
/**
* Return the actual SQL Error number
*
* @return integer The SQL Error number
*
* @since 3.4.6
*/
protected function getErrorNumber()
{
return (int) mysql_errno($this->connection);
}
/**
* Return the actual SQL Error message
*
* @return string The SQL Error message
*
* @since 3.4.6
*/
protected function getErrorMessage()
{
$errorMessage = (string) mysql_error($this->connection);
// Replace the Databaseprefix with `#__` if we are not in Debug
if (!$this->debug)
{
$errorMessage = str_replace($this->tablePrefix, '#__', $errorMessage);
}
return $errorMessage;
}
}