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<?php
/**
* Akeeba Engine
*
* @package akeebaengine
* @copyright Copyright (c)2006-2022 Nicholas K. Dionysopoulos / Akeeba Ltd
* @license GNU General Public License version 3, or later
*/
namespace Akeeba\Engine\Driver;
defined('AKEEBAENGINE') || die();
use Akeeba\Engine\Driver\Query\Mysqli as QueryMysqli;
use mysqli_result;
use RuntimeException;
/**
* 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';
/** @var \mysqli|null The db connection resource */
protected $connection = '';
/** @var mysqli_result|null The database connection cursor from the last query. */
protected $cursor;
protected $port;
protected $socket;
/** @var bool Are we in the process of reconnecting to the database server? */
private $isReconnecting = false;
/**
* 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
$this->fixHostnamePortSocket($host, $port, $socket);
// Set the information
$this->host = $host;
$this->user = $user;
$this->password = $password;
$this->port = $port;
$this->socket = $socket;
$this->_database = $database;
$this->selectDatabase = $select;
// finalize initialization
parent::__construct($options);
// Open the connection
if (!is_object($this->connection))
{
$this->open();
}
}
/**
* 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'));
}
public function close()
{
$return = false;
if (is_object($this->cursor) && ($this->cursor instanceof mysqli_result))
{
try
{
@$this->cursor->free();
}
catch (\Throwable $e)
{
}
$this->cursor = null;
}
if (is_object($this->connection) && ($this->connection instanceof \mysqli))
{
try
{
$return = @$this->connection->close();
}
catch (\Throwable $e)
{
$return = false;
}
}
$this->connection = null;
return $return;
}
/**
* Determines if the connection to the server is active.
*
* @return boolean True if connected to the database engine.
*/
public function connected()
{
if (is_object($this->connection))
{
return @mysqli_ping($this->connection);
}
return false;
}
/**
* 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(), $text);
if ($result === false)
{
// Attempt to reconnect.
try
{
$this->connection = null;
$this->open();
$result = @mysqli_real_escape_string($this->getConnection(), $text);;
}
catch (RuntimeException $e)
{
$result = $this->unsafe_escape($text);
}
}
if ($extra)
{
$result = addcslashes($result, '%_');
}
return $result;
}
/**
* 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 ?: $this->cursor);
}
/**
* 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 ?: $this->cursor);
}
/**
* Get the number of affected rows for the previous executed SQL statement.
*
* @return integer The number of affected rows.
*/
public function getAffectedRows()
{
return mysqli_affected_rows($this->connection);
}
/**
* Get the number of returned rows for the previous executed SQL statement.
*
* @param mysqli_result $cursor An optional database cursor resource to extract the row count from.
*
* @return integer The number of returned rows.
*/
public function getNumRows($cursor = null)
{
return mysqli_num_rows($cursor ?: $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);
}
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();
}
/**
* Execute the SQL statement.
*
* @return mixed A database cursor resource on success, boolean false on failure.
*/
public function query()
{
$this->open();
if (!is_object($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() && !$this->isReconnecting)
{
$this->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();
$this->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;
}
/**
* 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', '>=');
}
}
/**
* 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 ?: $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 ?: $this->cursor, $class);
}
/**
* Tries to parse all the weird hostname definitions and normalize them into something that the MySQLi connector
* will understand. Please note that there are some differences to the old MySQL driver:
*
* * Port and socket MUST be provided separately from the hostname. Hostnames in the form of 127.0.0.1:8336 are no
* longer acceptable.
*
* * The hostname "localhost" has special meaning. It means "use named pipes / sockets". Anything else uses TCP/IP.
* This is the ONLY way to specify a. TCP/IP or b. named pipes / sockets connection.
*
* * You SHOULD NOT use a numeric TCP/IP port with hostname localhost. For some strange reason it's still allowed
* but the manual is self-contradicting over what this really does...
*
* * Likewise you CANNOT use a socket / named pipe path with hostname other than localhost. Named pipes and sockets
* can only be used with the local machine, therefore the hostname MUST be localhost.
*
* * You cannot give a TCP/IP port number in the socket parameter or a named pipe / socket path to the port
* parameter. This leads to an error.
*
* * You cannot use an empty string, 0 or any other non-null value when you want to omit either of the port or
* socket parameters.
*
* * Persistent connections must be prefixed with the string literal 'p:'. Therefore you cannot have a hostname
* called 'p' (not to mention that'd be daft). You can also not specify something like 'p:1234' to make a
* persistent connection to a port. This wasn't even supported by the old MySQL driver. As a result we don't even
* try to catch that degenerate case.
*
* This method will try to apply all of the aforementioned rules with one additional disambiguation rule:
*
* A port / socket set in the hostname overrides a port specified separately. A port specified separately overrides
* a socket specified separately.
*
* @param string $host The hostname. Can contain legacy hostname:port or hostname:sc=ocket definitions.
* @param int $port The port. Alternatively it can contain the path to the socket.
* @param string $socket The path to the socket. You could abuse it to enter the port number. DON'T!
*
* @return void All parameters are passed by reference.
*/
protected function fixHostnamePortSocket(&$host, &$port, &$socket)
{
// Is this a persistent connection? Persistent connections are indicated by the literal "p:" in front of the hostname
$isPersistent = (substr($host, 0, 2) == 'p:');
$host = $isPersistent ? substr($host, 2) : $host;
/*
* Unlike mysql_connect(), mysqli_connect() takes the port and socket as separate arguments. Therefore, we
* have to extract them from the host string.
*/
$port = !empty($port) ? $port : 3306;
$regex = '/^(?P<host>((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))(:(?P<port>.+))?$/';
// It's an IPv4 address with or without port
if (preg_match($regex, $host, $matches))
{
$host = $matches['host'];
if (!empty($matches['port']))
{
$port = $matches['port'];
}
}
// Square-bracketed IPv6 address with or without port, e.g. [fe80:102::2%eth1]:3306
elseif (preg_match('/^(?P<host>\[.*\])(:(?P<port>.+))?$/', $host, $matches))
{
$host = $matches['host'];
if (!empty($matches['port']))
{
$port = $matches['port'];
}
}
// Named host (e.g example.com or localhost) with or without port
elseif (preg_match('/^(?P<host>(\w+:\/{2,3})?[a-z0-9\.\-]+)(:(?P<port>[^:]+))?$/i', $host, $matches))
{
$host = $matches['host'];
if (!empty($matches['port']))
{
$port = $matches['port'];
}
}
// Empty host, just port, e.g. ':3306'
elseif (preg_match('/^:(?P<port>[^:]+)$/', $host, $matches))
{
$host = 'localhost';
$port = $matches['port'];
}
// ... else we assume normal (naked) IPv6 address, so host and port stay as they are or default
// Get the port number or socket name
if (is_numeric($port))
{
$port = (int) $port;
$socket = '';
}
else
{
$socket = $port;
// If we're going to use sockets, port MUST BE null, otherwise mysqli_connect will try to use it ignoring
// the socket, causing a connection error
$port = null;
}
// Finally, if it's a persistent connection we have to prefix the hostname with 'p:'
$host = $isPersistent ? "p:$host" : $host;
}
}