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<?php
/**
* Part of the Joomla Framework Database Package
*
* @copyright Copyright (C) 2005 - 2021 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
namespace Joomla\Database\Mysql;
use Joomla\Database\Exception\ConnectionFailureException;
use Joomla\Database\Pdo\PdoDriver;
use Joomla\Database\UTF8MB4SupportInterface;
/**
* MySQL database driver supporting PDO based connections
*
* @link https://www.php.net/manual/en/ref.pdo-mysql.php
* @since 1.0
*/
class MysqlDriver extends PdoDriver implements UTF8MB4SupportInterface
{
/**
* The name of the database driver.
*
* @var string
* @since 1.0
*/
public $name = 'mysql';
/**
* The character(s) used to quote SQL statement names such as table names or field names, etc.
*
* If a single character string the same character is used for both sides of the quoted name, else the first character will be used for the
* opening quote and the second for the closing quote.
*
* @var string
* @since 1.0
*/
protected $nameQuote = '`';
/**
* The null or zero representation of a timestamp for the database driver.
*
* @var string
* @since 1.0
*/
protected $nullDate = '0000-00-00 00:00:00';
/**
* True if the database engine supports UTF-8 Multibyte (utf8mb4) character encoding.
*
* @var boolean
* @since 1.4.0
*/
protected $utf8mb4 = false;
/**
* True if the database engine is MariaDB.
*
* @var boolean
* @since 2.0.0
*/
protected $mariadb = false;
/**
* The minimum supported database version.
*
* @var string
* @since 1.0
*/
protected static $dbMinimum = '5.6';
/**
* The minimum supported MariaDB database version.
*
* @var string
* @since 2.0.0
*/
protected static $dbMinMariadb = '10.0';
/**
* The default cipher suite for TLS connections.
*
* @var array
* @since 2.0.0
*/
protected static $defaultCipherSuite = [
'AES128-GCM-SHA256',
'AES256-GCM-SHA384',
'AES128-CBC-SHA256',
'AES256-CBC-SHA384',
'DES-CBC3-SHA',
];
/**
* Constructor.
*
* @param array $options Array of database options with keys: host, user, password, database, select.
*
* @since 1.0
*/
public function __construct(array $options)
{
/**
* sql_mode to MySql 5.7.8+ default strict mode minus ONLY_FULL_GROUP_BY
*
* @link https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-8.html#mysqld-5-7-8-sql-mode
*/
$sqlModes = [
'STRICT_TRANS_TABLES',
'ERROR_FOR_DIVISION_BY_ZERO',
'NO_ENGINE_SUBSTITUTION',
];
// Get some basic values from the options.
$options['driver'] = 'mysql';
$options['charset'] = $options['charset'] ?? 'utf8';
$options['sqlModes'] = isset($options['sqlModes']) ? (array) $options['sqlModes'] : $sqlModes;
$this->charset = $options['charset'];
/*
* Pre-populate the UTF-8 Multibyte compatibility flag. Unfortunately PDO won't report the server version unless we're connected to it,
* and we cannot connect to it unless we know if it supports utf8mb4, which requires us knowing the server version. Because of this
* chicken and egg issue, we _assume_ it's supported and we'll just catch any problems at connection time.
*/
$this->utf8mb4 = $options['charset'] === 'utf8mb4';
// Finalize initialisation.
parent::__construct($options);
}
/**
* Connects to the database if needed.
*
* @return void Returns void if the database connected successfully.
*
* @since 1.0
* @throws \RuntimeException
*/
public function connect()
{
if ($this->getConnection())
{
return;
}
// For SSL/TLS connection encryption.
if ($this->options['ssl'] !== [] && $this->options['ssl']['enable'] === true)
{
$sslContextIsNull = true;
// If customised, add cipher suite, ca file path, ca path, private key file path and certificate file path to PDO driver options.
foreach (['cipher', 'ca', 'capath', 'key', 'cert'] as $key => $value)
{
if ($this->options['ssl'][$value] !== null)
{
$this->options['driverOptions'][constant('\PDO::MYSQL_ATTR_SSL_' . strtoupper($value))] = $this->options['ssl'][$value];
$sslContextIsNull = false;
}
}
// PDO, if no cipher, ca, capath, cert and key are set, can't start TLS one-way connection, set a common ciphers suite to force it.
if ($sslContextIsNull === true)
{
$this->options['driverOptions'][\PDO::MYSQL_ATTR_SSL_CIPHER] = implode(':', static::$defaultCipherSuite);
}
// If customised, for capable systems (PHP 7.0.14+ and 7.1.4+) verify certificate chain and Common Name to driver options.
if ($this->options['ssl']['verify_server_cert'] !== null && defined('\PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT'))
{
$this->options['driverOptions'][\PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT] = $this->options['ssl']['verify_server_cert'];
}
}
try
{
// Try to connect to MySQL
parent::connect();
}
catch (ConnectionFailureException $e)
{
// If the connection failed, but not because of the wrong character set, then bubble up the exception.
if (!$this->utf8mb4)
{
throw $e;
}
/*
* Otherwise, try connecting again without using utf8mb4 and see if maybe that was the problem. If the connection succeeds, then we
* will have learned that the client end of the connection does not support utf8mb4.
*/
$this->utf8mb4 = false;
$this->options['charset'] = 'utf8';
parent::connect();
}
$serverVersion = $this->getVersion();
$this->mariadb = stripos($serverVersion, 'mariadb') !== false;
if ($this->utf8mb4)
{
// At this point we know the client supports utf8mb4. Now we must check if the server supports utf8mb4 as well.
$this->utf8mb4 = version_compare($serverVersion, '5.5.3', '>=');
if ($this->mariadb && version_compare($serverVersion, '10.0.0', '<'))
{
$this->utf8mb4 = false;
}
if (!$this->utf8mb4)
{
// Reconnect with the utf8 character set.
parent::disconnect();
$this->options['charset'] = 'utf8';
parent::connect();
}
}
// If needed, set the sql modes.
if ($this->options['sqlModes'] !== [])
{
$this->connection->query('SET @@SESSION.sql_mode = \'' . implode(',', $this->options['sqlModes']) . '\';');
}
$this->setOption(\PDO::ATTR_EMULATE_PREPARES, true);
}
/**
* Automatically downgrade a CREATE TABLE or ALTER TABLE query from utf8mb4 (UTF-8 Multibyte) to plain utf8.
*
* Used when the server doesn't support UTF-8 Multibyte.
*
* @param string $query The query to convert
*
* @return string The converted query
*
* @since 1.4.0
*/
public function convertUtf8mb4QueryToUtf8($query)
{
if ($this->hasUTF8mb4Support())
{
return $query;
}
// If it's not an ALTER TABLE or CREATE TABLE command there's nothing to convert
$beginningOfQuery = substr($query, 0, 12);
$beginningOfQuery = strtoupper($beginningOfQuery);
if (!\in_array($beginningOfQuery, ['ALTER TABLE ', 'CREATE TABLE'], true))
{
return $query;
}
// Replace utf8mb4 with utf8
return str_replace('utf8mb4', 'utf8', $query);
}
/**
* Test to see if the MySQL connector is available.
*
* @return boolean True on success, false otherwise.
*
* @since 1.0
*/
public static function isSupported()
{
return class_exists('\\PDO') && \in_array('mysql', \PDO::getAvailableDrivers(), true);
}
/**
* Select a database for use.
*
* @param string $database The name of the database to select for use.
*
* @return boolean
*
* @since 1.0
* @throws \RuntimeException
*/
public function select($database)
{
$this->connect();
$this->setQuery('USE ' . $this->quoteName($database))
->execute();
return true;
}
/**
* Return the query string to alter the database character set.
*
* @param string $dbName The database name
*
* @return string The query that alter the database query string
*
* @since 2.0.0
*/
public function getAlterDbCharacterSet($dbName)
{
$charset = $this->utf8mb4 ? 'utf8mb4' : 'utf8';
return 'ALTER DATABASE ' . $this->quoteName($dbName) . ' CHARACTER SET `' . $charset . '`';
}
/**
* Method to get the database collation in use by sampling a text field of a table in the database.
*
* @return string|boolean The collation in use by the database (string) or boolean false if not supported.
*
* @since 1.0
* @throws \RuntimeException
*/
public function getCollation()
{
$this->connect();
return $this->setQuery('SELECT @@collation_database;')->loadResult();
}
/**
* Method to get the database connection collation in use by sampling a text field of a table in the database.
*
* @return string|boolean The collation in use by the database connection (string) or boolean false if not supported.
*
* @since 1.6.0
* @throws \RuntimeException
*/
public function getConnectionCollation()
{
$this->connect();
return $this->setQuery('SELECT @@collation_connection;')->loadResult();
}
/**
* Method to get the database encryption details (cipher and protocol) in use.
*
* @return string The database encryption details.
*
* @since 2.0.0
* @throws \RuntimeException
*/
public function getConnectionEncryption(): string
{
$this->connect();
$variables = $this->setQuery('SHOW SESSION STATUS WHERE `Variable_name` IN (\'Ssl_version\', \'Ssl_cipher\')')
->loadObjectList('Variable_name');
if (!empty($variables['Ssl_cipher']->Value))
{
return $variables['Ssl_version']->Value . ' (' . $variables['Ssl_cipher']->Value . ')';
}
return '';
}
/**
* Method to test if the database TLS connections encryption are supported.
*
* @return boolean Whether the database supports TLS connections encryption.
*
* @since 2.0.0
*/
public function isConnectionEncryptionSupported(): bool
{
$this->connect();
$variables = $this->setQuery('SHOW SESSION VARIABLES WHERE `Variable_name` IN (\'have_ssl\')')->loadObjectList('Variable_name');
return !empty($variables['have_ssl']->Value) && $variables['have_ssl']->Value === 'YES';
}
/**
* Return the query string to create new Database.
*
* @param stdClass $options Object used to pass user and database name to database driver. This object must have "db_name" and "db_user" set.
* @param boolean $utf True if the database supports the UTF-8 character set.
*
* @return string The query that creates database
*
* @since 2.0.0
*/
protected function getCreateDatabaseQuery($options, $utf)
{
if ($utf)
{
$charset = $this->utf8mb4 ? 'utf8mb4' : 'utf8';
$collation = $charset . '_unicode_ci';
return 'CREATE DATABASE ' . $this->quoteName($options->db_name) . ' CHARACTER SET `' . $charset . '` COLLATE `' . $collation . '`';
}
return 'CREATE DATABASE ' . $this->quoteName($options->db_name);
}
/**
* Shows the table CREATE statement that creates the given tables.
*
* @param array|string $tables A table name or a list of table names.
*
* @return array A list of the create SQL for the tables.
*
* @since 1.0
* @throws \RuntimeException
*/
public function getTableCreate($tables)
{
$this->connect();
// Initialise variables.
$result = [];
// Sanitize input to an array and iterate over the list.
$tables = (array) $tables;
foreach ($tables as $table)
{
$row = $this->setQuery('SHOW CREATE TABLE ' . $this->quoteName($table))->loadRow();
// Populate the result array based on the create statements.
$result[$table] = $row[1];
}
return $result;
}
/**
* Retrieves field information about a given table.
*
* @param string $table The name of the database table.
* @param boolean $typeOnly True to only return field types.
*
* @return array An array of fields for the database table.
*
* @since 1.0
* @throws \RuntimeException
*/
public function getTableColumns($table, $typeOnly = true)
{
$this->connect();
$result = [];
// Set the query to get the table fields statement.
$fields = $this->setQuery('SHOW FULL COLUMNS FROM ' . $this->quoteName($table))->loadObjectList();
// If we only want the type as the value add just that to the list.
if ($typeOnly)
{
foreach ($fields as $field)
{
$result[$field->Field] = preg_replace('/[(0-9)]/', '', $field->Type);
}
}
// If we want the whole field data object add that to the list.
else
{
foreach ($fields as $field)
{
$result[$field->Field] = $field;
}
}
return $result;
}
/**
* Get the details list of keys for a table.
*
* @param string $table The name of the table.
*
* @return array An array of the column specification for the table.
*
* @since 1.0
* @throws \RuntimeException
*/
public function getTableKeys($table)
{
$this->connect();
// Get the details columns information.
return $this->setQuery('SHOW KEYS FROM ' . $this->quoteName($table))->loadObjectList();
}
/**
* Method to get an array of all tables in the database.
*
* @return array An array of all the tables in the database.
*
* @since 1.0
* @throws \RuntimeException
*/
public function getTableList()
{
$this->connect();
// Set the query to get the tables statement.
return $this->setQuery('SHOW TABLES')->loadColumn();
}
/**
* Get the version of the database connector.
*
* @return string The database connector version.
*
* @since 2.0.0
*/
public function getVersion()
{
$this->connect();
$version = $this->getOption(\PDO::ATTR_SERVER_VERSION);
if (stripos($version, 'mariadb') !== false)
{
// MariaDB: Strip off any leading '5.5.5-', if present
return preg_replace('/^5\.5\.5-/', '', $version);
}
return $version;
}
/**
* Get the minimum supported database version.
*
* @return string
*
* @since 2.0.0
*/
public function getMinimum()
{
return $this->mariadb ? static::$dbMinMariadb : static::$dbMinimum;
}
/**
* Get the null or zero representation of a timestamp for the database driver.
*
* @return string
*
* @since 2.0.0
*/
public function getNullDate()
{
// Check the session sql mode;
if (\in_array('NO_ZERO_DATE', $this->options['sqlModes']) !== false)
{
$this->nullDate = '1000-01-01 00:00:00';
}
return $this->nullDate;
}
/**
* Determine whether the database engine support the UTF-8 Multibyte (utf8mb4) character encoding.
*
* @return boolean True if the database engine supports UTF-8 Multibyte.
*
* @since 2.0.0
*/
public function hasUTF8mb4Support()
{
return $this->utf8mb4;
}
/**
* Determine if the database engine is MariaDB.
*
* @return boolean
*
* @since 2.0.0
*/
public function isMariaDb(): bool
{
$this->connect();
return $this->mariadb;
}
/**
* Locks a table in the database.
*
* @param string $table The name of the table to unlock.
*
* @return $this
*
* @since 1.0
* @throws \RuntimeException
*/
public function lockTable($table)
{
$this->setQuery('LOCK TABLES ' . $this->quoteName($table) . ' WRITE')
->execute();
return $this;
}
/**
* Renames a table in the database.
*
* @param string $oldTable The name of the table to be renamed
* @param string $newTable The new name for the table.
* @param string $backup Not used by MySQL.
* @param string $prefix Not used by MySQL.
*
* @return $this
*
* @since 1.0
* @throws \RuntimeException
*/
public function renameTable($oldTable, $newTable, $backup = null, $prefix = null)
{
$this->setQuery('RENAME TABLE ' . $this->quoteName($oldTable) . ' TO ' . $this->quoteName($newTable))
->execute();
return $this;
}
/**
* Inserts a row into a table based on an object's properties.
*
* @param string $table The name of the database table to insert into.
* @param object $object A reference to an object whose public properties match the table fields.
* @param string $key The name of the primary key. If provided the object property is updated.
*
* @return boolean
*
* @since 2.0.0
* @throws \RuntimeException
*/
public function insertObject($table, &$object, $key = null)
{
$fields = [];
$values = [];
$tableColumns = $this->getTableColumns($table);
// Iterate over the object variables to build the query fields and values.
foreach (get_object_vars($object) as $k => $v)
{
// Skip columns that don't exist in the table.
if (!array_key_exists($k, $tableColumns))
{
continue;
}
// Only process non-null scalars.
if (\is_array($v) || \is_object($v) || $v === null)
{
continue;
}
// Ignore any internal fields.
if ($k[0] === '_')
{
continue;
}
// Ignore null datetime fields.
if ($tableColumns[$k] === 'datetime' && empty($v))
{
continue;
}
// Ignore null integer fields.
if (stristr($tableColumns[$k], 'int') !== false && $v === '')
{
continue;
}
// Prepare and sanitize the fields and values for the database query.
$fields[] = $this->quoteName($k);
$values[] = $this->quote($v);
}
// Create the base insert statement.
$query = $this->getQuery(true)
->insert($this->quoteName($table))
->columns($fields)
->values(implode(',', $values));
// Set the query and execute the insert.
$this->setQuery($query)->execute();
// Update the primary key if it exists.
$id = $this->insertid();
if ($key && $id && \is_string($key))
{
$object->$key = $id;
}
return true;
}
/**
* Method to escape a string for usage in an SQL statement.
*
* Oracle escaping reference:
* http://www.orafaq.com/wiki/SQL_FAQ#How_does_one_escape_special_characters_when_writing_SQL_queries.3F
*
* SQLite escaping notes:
* http://www.sqlite.org/faq.html#q14
*
* Method body is as implemented by the Zend Framework
*
* Note: Using query objects with bound variables is preferable to the below.
*
* @param string $text The string to be escaped.
* @param boolean $extra Unused optional parameter to provide extra escaping.
*
* @return string The escaped string.
*
* @since 1.0
*/
public function escape($text, $extra = false)
{
if (\is_int($text))
{
return $text;
}
if (\is_float($text))
{
// Force the dot as a decimal point.
return str_replace(',', '.', (string) $text);
}
$this->connect();
$result = substr($this->connection->quote($text), 1, -1);
if ($extra)
{
$result = addcslashes($result, '%_');
}
return $result;
}
/**
* Unlocks tables in the database.
*
* @return $this
*
* @since 1.0
* @throws \RuntimeException
*/
public function unlockTables()
{
$this->setQuery('UNLOCK TABLES')
->execute();
return $this;
}
/**
* Method to commit a transaction.
*
* @param boolean $toSavepoint If true, commit to the last savepoint.
*
* @return void
*
* @since 1.0
* @throws \RuntimeException
*/
public function transactionCommit($toSavepoint = false)
{
$this->connect();
if (!$toSavepoint || $this->transactionDepth <= 1)
{
parent::transactionCommit($toSavepoint);
}
else
{
$this->transactionDepth--;
}
}
/**
* Method to roll back a transaction.
*
* @param boolean $toSavepoint If true, rollback to the last savepoint.
*
* @return void
*
* @since 1.0
* @throws \RuntimeException
*/
public function transactionRollback($toSavepoint = false)
{
$this->connect();
if (!$toSavepoint || $this->transactionDepth <= 1)
{
parent::transactionRollback($toSavepoint);
}
else
{
$savepoint = 'SP_' . ($this->transactionDepth - 1);
$this->setQuery('ROLLBACK TO SAVEPOINT ' . $this->quoteName($savepoint));
if ($this->execute())
{
$this->transactionDepth--;
}
}
}
/**
* Method to initialize a transaction.
*
* @param boolean $asSavepoint If true and a transaction is already active, a savepoint will be created.
*
* @return void
*
* @since 1.0
* @throws \RuntimeException
*/
public function transactionStart($asSavepoint = false)
{
$this->connect();
if (!$asSavepoint || !$this->transactionDepth)
{
parent::transactionStart($asSavepoint);
}
else
{
$savepoint = 'SP_' . $this->transactionDepth;
$this->setQuery('SAVEPOINT ' . $this->quoteName($savepoint));
if ($this->execute())
{
$this->transactionDepth++;
}
}
}
}