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<?php
/**
* Akeeba Engine
* The modular PHP5 site backup engine
* @copyright Copyright (c)2006-2016 Nicholas K. Dionysopoulos
* @license GNU GPL version 3 or, at your option, any later version
* @package akeebaengine
*/
namespace Akeeba\Engine\Driver;
// Protection against direct access
defined('AKEEBAENGINE') or die();
use Akeeba\Engine\Driver\Query\Mysqli as QueryMysqli;
/**
* MySQL Improved (mysqli) database driver for Akeeba Engine
*
* Based on Joomla! Platform 11.2
*/
class Mysqli extends Mysql
{
/**
* The name of the database driver.
*
* @var string
* @since 11.1
*/
public $name = 'mysqli';
/**
* Database object constructor
*
* @param array $options List of options used to configure the connection
*/
public function __construct($options)
{
$this->driverType = 'mysql';
// Init
$this->nameQuote = '`';
$host = array_key_exists('host', $options) ? $options['host'] : 'localhost';
$port = array_key_exists('port', $options) ? $options['port'] : '';
$user = array_key_exists('user', $options) ? $options['user'] : '';
$password = array_key_exists('password', $options) ? $options['password'] : '';
$database = array_key_exists('database', $options) ? $options['database'] : '';
$prefix = array_key_exists('prefix', $options) ? $options['prefix'] : '';
$select = array_key_exists('select', $options) ? $options['select'] : true;
$socket = null;
// Figure out if a port is included in the host name
if (empty($port))
{
// Unlike mysql_connect(), mysqli_connect() takes the port and socket
// as separate arguments. Therefore, we have to extract them from the
// host string.
$port = null;
$targetSlot = substr(strstr($host, ":"), 1);
if (!empty($targetSlot))
{
// Get the port number or socket name
if (is_numeric($targetSlot))
{
$port = $targetSlot;
}
else
{
$socket = $targetSlot;
}
// Extract the host name only
$host = substr($host, 0, strlen($host) - (strlen($targetSlot) + 1));
// This will take care of the following notation: ":3306"
if ($host == '')
{
$host = 'localhost';
}
}
}
// finalize initialization
parent::__construct($options);
// Open the connection
$this->host = $host;
$this->user = $user;
$this->password = $password;
$this->port = $port;
$this->socket = $socket;
$this->_database = $database;
$this->selectDatabase = $select;
if (!is_object($this->connection))
{
$this->open();
}
}
public function open()
{
if ($this->connected())
{
return;
}
else
{
$this->close();
}
// perform a number of fatality checks, then return gracefully
if (!function_exists('mysqli_connect'))
{
$this->errorNum = 1;
$this->errorMsg = 'The MySQL adapter "mysqli" is not available.';
return;
}
// connect to the server
if (!($this->connection = @mysqli_connect($this->host, $this->user, $this->password, null, $this->port, $this->socket)))
{
$this->errorNum = 2;
$this->errorMsg = 'Could not connect to MySQL';
return;
}
// Set sql_mode to non_strict mode
mysqli_query($this->connection, "SET @@SESSION.sql_mode = '';");
if ($this->selectDatabase && !empty($this->_database))
{
if (!$this->select($this->_database))
{
$this->errorNum = 3;
$this->errorMsg = "Cannot select database {$this->_database}";
return;
}
}
$this->setUTF();
}
public function close()
{
$return = false;
if (is_resource($this->cursor))
{
mysqli_free_result($this->cursor);
}
if (is_object($this->connection))
{
$return = @mysqli_close($this->connection);
}
$this->connection = null;
return $return;
}
/**
* Method to escape a string for usage in an SQL statement.
*
* @param string $text The string to be escaped.
* @param boolean $extra Optional parameter to provide extra escaping.
*
* @return string The escaped string.
*/
public function escape($text, $extra = false)
{
$result = @mysqli_real_escape_string($this->getConnection(), $text);
if ($extra)
{
$result = addcslashes($result, '%_');
}
return $result;
}
/**
* Test to see if the MySQL connector is available.
*
* @return boolean True on success, false otherwise.
*/
public static function isSupported()
{
return (function_exists('mysqli_connect'));
}
/**
* Determines if the connection to the server is active.
*
* @return boolean True if connected to the database engine.
*/
public function connected()
{
if (is_object($this->connection))
{
return mysqli_ping($this->connection);
}
return false;
}
/**
* Get the number of affected rows for the previous executed SQL statement.
*
* @return integer The number of affected rows.
*/
public function getAffectedRows()
{
return mysqli_affected_rows($this->connection);
}
/**
* Get the number of returned rows for the previous executed SQL statement.
*
* @param resource $cursor An optional database cursor resource to extract the row count from.
*
* @return integer The number of returned rows.
*/
public function getNumRows($cursor = null)
{
return mysqli_num_rows($cursor ? $cursor : $this->cursor);
}
/**
* Get the current or query, or new JDatabaseQuery object.
*
* @param boolean $new False to return the last query set, True to return a new JDatabaseQuery object.
*
* @return mixed The current value of the internal SQL variable or a new JDatabaseQuery object.
*/
public function getQuery($new = false)
{
if ($new)
{
return new QueryMysqli($this);
}
else
{
return $this->sql;
}
}
/**
* Get the version of the database connector.
*
* @return string The database connector version.
*/
public function getVersion()
{
return mysqli_get_server_info($this->connection);
}
/**
* Determines if the database engine supports UTF-8 character encoding.
*
* @return boolean True if supported.
*/
public function hasUTF()
{
$verParts = explode('.', $this->getVersion());
return ($verParts[0] == 5 || ($verParts[0] == 4 && $verParts[1] == 1 && (int)$verParts[2] >= 2));
}
/**
* 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.
*/
public function insertid()
{
return mysqli_insert_id($this->connection);
}
/**
* Execute the SQL statement.
*
* @return mixed A database cursor resource on success, boolean false on failure.
*/
public function query()
{
static $isReconnecting = false;
$this->open();
if (!is_object($this->connection))
{
throw new \RuntimeException($this->errorMsg, $this->errorNum);
}
// 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->limit > 0 || $this->offset > 0)
{
$query .= ' LIMIT ' . $this->offset . ', ' . $this->limit;
}
// Increment the query counter.
$this->count++;
// If debugging is enabled then let's log the query.
if ($this->debug)
{
// Add the query to the object queue.
$this->log[] = $query;
}
// Reset the error values.
$this->errorNum = 0;
$this->errorMsg = '';
// Execute the query. Error suppression is used here to prevent warnings/notices that the connection has been lost.
$this->cursor = @mysqli_query($this->connection, $query);
// If an error occurred handle it.
if (!$this->cursor)
{
$this->errorNum = (int)mysqli_errno($this->connection);
$this->errorMsg = (string)mysqli_error($this->connection) . ' SQL=' . $query;
// Check if the server was disconnected.
if (!$this->connected() && !$isReconnecting)
{
$isReconnecting = true;
try
{
// Attempt to reconnect.
$this->connection = null;
$this->open();
}
// If connect fails, ignore that exception and throw the normal exception.
catch (\RuntimeException $e)
{
throw new \RuntimeException($this->errorMsg, $this->errorNum);
}
// Since we were able to reconnect, run the query again.
$result = $this->query();
$isReconnecting = false;
return $result;
}
// The server was not disconnected.
elseif ($this->errorNum != 0)
{
throw new \RuntimeException($this->errorMsg, $this->errorNum);
}
}
return $this->cursor;
}
/**
* Select a database for use.
*
* @param string $database The name of the database to select for use.
*
* @return boolean True if the database was successfully selected.
*/
public function select($database)
{
if (!$database)
{
return false;
}
if (!mysqli_select_db($this->connection, $database))
{
return false;
}
return true;
}
/**
* Set the connection to use UTF-8 character encoding.
*
* @return boolean True on success.
*/
public function setUTF()
{
$result = false;
if ($this->supportsUtf8mb4())
{
$result = @mysqli_set_charset($this->connection, 'utf8mb4');
}
if (!$result)
{
$result = @mysqli_set_charset($this->connection, 'utf8');
}
return $result;
}
/**
* Method to fetch a row from the result set cursor as an array.
*
* @param mixed $cursor The optional result set cursor from which to fetch the row.
*
* @return mixed Either the next row from the result set or false if there are no more rows.
*/
protected function fetchArray($cursor = null)
{
return mysqli_fetch_row($cursor ? $cursor : $this->cursor);
}
/**
* Method to fetch a row from the result set cursor as an associative array.
*
* @param mixed $cursor The optional result set cursor from which to fetch the row.
*
* @return mixed Either the next row from the result set or false if there are no more rows.
*/
public function fetchAssoc($cursor = null)
{
return mysqli_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 $class The class name to use for the returned row object.
*
* @return mixed Either the next row from the result set or false if there are no more rows.
*/
protected function fetchObject($cursor = null, $class = 'stdClass')
{
return mysqli_fetch_object($cursor ? $cursor : $this->cursor, $class);
}
/**
* Method to free up the memory used for the result set.
*
* @param mixed $cursor The optional result set cursor from which to fetch the row.
*
* @return void
*/
public function freeResult($cursor = null)
{
mysqli_free_result($cursor ? $cursor : $this->cursor);
}
/**
* Does this database server support UTF-8 four byte (utf8mb4) collation?
*
* libmysql supports utf8mb4 since 5.5.3 (same version as the MySQL server). mysqlnd supports utf8mb4 since 5.0.9.
*
* This method's code is based on WordPress' wpdb::has_cap() method
*
* @return bool
*/
public function supportsUtf8mb4()
{
$client_version = mysqli_get_client_info();
if (strpos($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', '>=');
}
}
}