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+<?php
+
+/**
+ * @file
+ * Database interface code for MySQL database servers.
+ */
+
+/**
+ * @addtogroup database
+ * @{
+ */
+
+class DatabaseConnection_mysql extends DatabaseConnection {
+
+ /**
+ * Flag to indicate if the cleanup function in __destruct() should run.
+ *
+ * @var boolean
+ */
+ protected $needsCleanup = FALSE;
+
+ public function __construct(array $connection_options = array()) {
+ // This driver defaults to transaction support, except if explicitly passed FALSE.
+ $this->transactionSupport = !isset($connection_options['transactions']) || ($connection_options['transactions'] !== FALSE);
+
+ // MySQL never supports transactional DDL.
+ $this->transactionalDDLSupport = FALSE;
+
+ $this->connectionOptions = $connection_options;
+
+ // The DSN should use either a socket or a host/port.
+ if (isset($connection_options['unix_socket'])) {
+ $dsn = 'mysql:unix_socket=' . $connection_options['unix_socket'];
+ }
+ else {
+ // Default to TCP connection on port 3306.
+ $dsn = 'mysql:host=' . $connection_options['host'] . ';port=' . (empty($connection_options['port']) ? 3306 : $connection_options['port']);
+ }
+ $dsn .= ';dbname=' . $connection_options['database'];
+ // Allow PDO options to be overridden.
+ $connection_options += array(
+ 'pdo' => array(),
+ );
+ $connection_options['pdo'] += array(
+ // So we don't have to mess around with cursors and unbuffered queries by default.
+ PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => TRUE,
+ // Because MySQL's prepared statements skip the query cache, because it's dumb.
+ PDO::ATTR_EMULATE_PREPARES => TRUE,
+ );
+
+ parent::__construct($dsn, $connection_options['username'], $connection_options['password'], $connection_options['pdo']);
+
+ // Force MySQL to use the UTF-8 character set. Also set the collation, if a
+ // certain one has been set; otherwise, MySQL defaults to 'utf8_general_ci'
+ // for UTF-8.
+ if (!empty($connection_options['collation'])) {
+ $this->exec('SET NAMES utf8 COLLATE ' . $connection_options['collation']);
+ }
+ else {
+ $this->exec('SET NAMES utf8');
+ }
+
+ // Set MySQL init_commands if not already defined. Default Drupal's MySQL
+ // behavior to conform more closely to SQL standards. This allows Drupal
+ // to run almost seamlessly on many different kinds of database systems.
+ // These settings force MySQL to behave the same as postgresql, or sqlite
+ // in regards to syntax interpretation and invalid data handling. See
+ // http://drupal.org/node/344575 for further discussion. Also, as MySQL 5.5
+ // changed the meaning of TRADITIONAL we need to spell out the modes one by
+ // one.
+ $connection_options += array(
+ 'init_commands' => array(),
+ );
+ $connection_options['init_commands'] += array(
+ 'sql_mode' => "SET sql_mode = 'ANSI,STRICT_TRANS_TABLES,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER'",
+ );
+ // Set connection options.
+ $this->exec(implode('; ', $connection_options['init_commands']));
+ }
+
+ public function __destruct() {
+ if ($this->needsCleanup) {
+ $this->nextIdDelete();
+ }
+ }
+
+ public function queryRange($query, $from, $count, array $args = array(), array $options = array()) {
+ return $this->query($query . ' LIMIT ' . (int) $from . ', ' . (int) $count, $args, $options);
+ }
+
+ public function queryTemporary($query, array $args = array(), array $options = array()) {
+ $tablename = $this->generateTemporaryTableName();
+ $this->query(preg_replace('/^SELECT/i', 'CREATE TEMPORARY TABLE {' . $tablename . '} Engine=MEMORY SELECT', $query), $args, $options);
+ return $tablename;
+ }
+
+ public function driver() {
+ return 'mysql';
+ }
+
+ public function databaseType() {
+ return 'mysql';
+ }
+
+ public function mapConditionOperator($operator) {
+ // We don't want to override any of the defaults.
+ return NULL;
+ }
+
+ public function nextId($existing_id = 0) {
+ $new_id = $this->query('INSERT INTO {sequences} () VALUES ()', array(), array('return' => Database::RETURN_INSERT_ID));
+ // This should only happen after an import or similar event.
+ if ($existing_id >= $new_id) {
+ // If we INSERT a value manually into the sequences table, on the next
+ // INSERT, MySQL will generate a larger value. However, there is no way
+ // of knowing whether this value already exists in the table. MySQL
+ // provides an INSERT IGNORE which would work, but that can mask problems
+ // other than duplicate keys. Instead, we use INSERT ... ON DUPLICATE KEY
+ // UPDATE in such a way that the UPDATE does not do anything. This way,
+ // duplicate keys do not generate errors but everything else does.
+ $this->query('INSERT INTO {sequences} (value) VALUES (:value) ON DUPLICATE KEY UPDATE value = value', array(':value' => $existing_id));
+ $new_id = $this->query('INSERT INTO {sequences} () VALUES ()', array(), array('return' => Database::RETURN_INSERT_ID));
+ }
+ $this->needsCleanup = TRUE;
+ return $new_id;
+ }
+
+ public function nextIdDelete() {
+ // While we want to clean up the table to keep it up from occupying too
+ // much storage and memory, we must keep the highest value in the table
+ // because InnoDB uses an in-memory auto-increment counter as long as the
+ // server runs. When the server is stopped and restarted, InnoDB
+ // reinitializes the counter for each table for the first INSERT to the
+ // table based solely on values from the table so deleting all values would
+ // be a problem in this case. Also, TRUNCATE resets the auto increment
+ // counter.
+ try {
+ $max_id = $this->query('SELECT MAX(value) FROM {sequences}')->fetchField();
+ // We know we are using MySQL here, no need for the slower db_delete().
+ $this->query('DELETE FROM {sequences} WHERE value < :value', array(':value' => $max_id));
+ }
+ // During testing, this function is called from shutdown with the
+ // simpletest prefix stored in $this->connection, and those tables are gone
+ // by the time shutdown is called so we need to ignore the database
+ // errors. There is no problem with completely ignoring errors here: if
+ // these queries fail, the sequence will work just fine, just use a bit
+ // more database storage and memory.
+ catch (PDOException $e) {
+ }
+ }
+
+ /**
+ * Overridden to work around issues to MySQL not supporting transactional DDL.
+ */
+ protected function popCommittableTransactions() {
+ // Commit all the committable layers.
+ foreach (array_reverse($this->transactionLayers) as $name => $active) {
+ // Stop once we found an active transaction.
+ if ($active) {
+ break;
+ }
+
+ // If there are no more layers left then we should commit.
+ unset($this->transactionLayers[$name]);
+ if (empty($this->transactionLayers)) {
+ if (!PDO::commit()) {
+ throw new DatabaseTransactionCommitFailedException();
+ }
+ }
+ else {
+ // Attempt to release this savepoint in the standard way.
+ try {
+ $this->query('RELEASE SAVEPOINT ' . $name);
+ }
+ catch (PDOException $e) {
+ // However, in MySQL (InnoDB), savepoints are automatically committed
+ // when tables are altered or created (DDL transactions are not
+ // supported). This can cause exceptions due to trying to release
+ // savepoints which no longer exist.
+ //
+ // To avoid exceptions when no actual error has occurred, we silently
+ // succeed for MySQL error code 1305 ("SAVEPOINT does not exist").
+ if ($e->errorInfo[1] == '1305') {
+ // If one SAVEPOINT was released automatically, then all were.
+ // Therefore, clean the transaction stack.
+ $this->transactionLayers = array();
+ // We also have to explain to PDO that the transaction stack has
+ // been cleaned-up.
+ PDO::commit();
+ }
+ else {
+ throw $e;
+ }
+ }
+ }
+ }
+ }
+}
+
+
+/**
+ * @} End of "addtogroup database".
+ */