--- /dev/null
+<?php
+
+namespace Drupal\Core\Database\Driver\sqlite;
+
+use Drupal\Core\Database\Database;
+use Drupal\Core\Database\DatabaseNotFoundException;
+use Drupal\Core\Database\Connection as DatabaseConnection;
+
+/**
+ * SQLite implementation of \Drupal\Core\Database\Connection.
+ */
+class Connection extends DatabaseConnection {
+
+ /**
+ * Error code for "Unable to open database file" error.
+ */
+ const DATABASE_NOT_FOUND = 14;
+
+ /**
+ * Whether or not the active transaction (if any) will be rolled back.
+ *
+ * @var bool
+ */
+ protected $willRollback;
+
+ /**
+ * A map of condition operators to SQLite operators.
+ *
+ * We don't want to override any of the defaults.
+ */
+ protected static $sqliteConditionOperatorMap = [
+ 'LIKE' => ['postfix' => " ESCAPE '\\'"],
+ 'NOT LIKE' => ['postfix' => " ESCAPE '\\'"],
+ 'LIKE BINARY' => ['postfix' => " ESCAPE '\\'", 'operator' => 'GLOB'],
+ 'NOT LIKE BINARY' => ['postfix' => " ESCAPE '\\'", 'operator' => 'NOT GLOB'],
+ ];
+
+ /**
+ * All databases attached to the current database. This is used to allow
+ * prefixes to be safely handled without locking the table
+ *
+ * @var array
+ */
+ protected $attachedDatabases = [];
+
+ /**
+ * Whether or not a table has been dropped this request: the destructor will
+ * only try to get rid of unnecessary databases if there is potential of them
+ * being empty.
+ *
+ * This variable is set to public because Schema needs to
+ * access it. However, it should not be manually set.
+ *
+ * @var bool
+ */
+ public $tableDropped = FALSE;
+
+ /**
+ * Constructs a \Drupal\Core\Database\Driver\sqlite\Connection object.
+ */
+ public function __construct(\PDO $connection, array $connection_options) {
+ // We don't need a specific PDOStatement class here, we simulate it in
+ // static::prepare().
+ $this->statementClass = NULL;
+
+ parent::__construct($connection, $connection_options);
+
+ // This driver defaults to transaction support, except if explicitly passed FALSE.
+ $this->transactionSupport = $this->transactionalDDLSupport = !isset($connection_options['transactions']) || $connection_options['transactions'] !== FALSE;
+
+ $this->connectionOptions = $connection_options;
+
+ // Attach one database for each registered prefix.
+ $prefixes = $this->prefixes;
+ foreach ($prefixes as &$prefix) {
+ // Empty prefix means query the main database -- no need to attach anything.
+ if (!empty($prefix)) {
+ // Only attach the database once.
+ if (!isset($this->attachedDatabases[$prefix])) {
+ $this->attachedDatabases[$prefix] = $prefix;
+ if ($connection_options['database'] === ':memory:') {
+ // In memory database use ':memory:' as database name. According to
+ // http://www.sqlite.org/inmemorydb.html it will open a unique
+ // database so attaching it twice is not a problem.
+ $this->query('ATTACH DATABASE :database AS :prefix', [':database' => $connection_options['database'], ':prefix' => $prefix]);
+ }
+ else {
+ $this->query('ATTACH DATABASE :database AS :prefix', [':database' => $connection_options['database'] . '-' . $prefix, ':prefix' => $prefix]);
+ }
+ }
+
+ // Add a ., so queries become prefix.table, which is proper syntax for
+ // querying an attached database.
+ $prefix .= '.';
+ }
+ }
+ // Regenerate the prefixes replacement table.
+ $this->setPrefix($prefixes);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function open(array &$connection_options = []) {
+ // Allow PDO options to be overridden.
+ $connection_options += [
+ 'pdo' => [],
+ ];
+ $connection_options['pdo'] += [
+ \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION,
+ // Convert numeric values to strings when fetching.
+ \PDO::ATTR_STRINGIFY_FETCHES => TRUE,
+ ];
+
+ try {
+ $pdo = new \PDO('sqlite:' . $connection_options['database'], '', '', $connection_options['pdo']);
+ }
+ catch (\PDOException $e) {
+ if ($e->getCode() == static::DATABASE_NOT_FOUND) {
+ throw new DatabaseNotFoundException($e->getMessage(), $e->getCode(), $e);
+ }
+ // SQLite doesn't have a distinct error code for access denied, so don't
+ // deal with that case.
+ throw $e;
+ }
+
+
+ // Create functions needed by SQLite.
+ $pdo->sqliteCreateFunction('if', [__CLASS__, 'sqlFunctionIf']);
+ $pdo->sqliteCreateFunction('greatest', [__CLASS__, 'sqlFunctionGreatest']);
+ $pdo->sqliteCreateFunction('pow', 'pow', 2);
+ $pdo->sqliteCreateFunction('exp', 'exp', 1);
+ $pdo->sqliteCreateFunction('length', 'strlen', 1);
+ $pdo->sqliteCreateFunction('md5', 'md5', 1);
+ $pdo->sqliteCreateFunction('concat', [__CLASS__, 'sqlFunctionConcat']);
+ $pdo->sqliteCreateFunction('concat_ws', [__CLASS__, 'sqlFunctionConcatWs']);
+ $pdo->sqliteCreateFunction('substring', [__CLASS__, 'sqlFunctionSubstring'], 3);
+ $pdo->sqliteCreateFunction('substring_index', [__CLASS__, 'sqlFunctionSubstringIndex'], 3);
+ $pdo->sqliteCreateFunction('rand', [__CLASS__, 'sqlFunctionRand']);
+ $pdo->sqliteCreateFunction('regexp', [__CLASS__, 'sqlFunctionRegexp']);
+
+ // SQLite does not support the LIKE BINARY operator, so we overload the
+ // non-standard GLOB operator for case-sensitive matching. Another option
+ // would have been to override another non-standard operator, MATCH, but
+ // that does not support the NOT keyword prefix.
+ $pdo->sqliteCreateFunction('glob', [__CLASS__, 'sqlFunctionLikeBinary']);
+
+ // Create a user-space case-insensitive collation with UTF-8 support.
+ $pdo->sqliteCreateCollation('NOCASE_UTF8', ['Drupal\Component\Utility\Unicode', 'strcasecmp']);
+
+ // Set SQLite init_commands if not already defined. Enable the Write-Ahead
+ // Logging (WAL) for SQLite. See https://www.drupal.org/node/2348137 and
+ // https://www.sqlite.org/wal.html.
+ $connection_options += [
+ 'init_commands' => [],
+ ];
+ $connection_options['init_commands'] += [
+ 'wal' => "PRAGMA journal_mode=WAL",
+ ];
+
+ // Execute sqlite init_commands.
+ if (isset($connection_options['init_commands'])) {
+ $pdo->exec(implode('; ', $connection_options['init_commands']));
+ }
+
+ return $pdo;
+ }
+
+
+ /**
+ * Destructor for the SQLite connection.
+ *
+ * We prune empty databases on destruct, but only if tables have been
+ * dropped. This is especially needed when running the test suite, which
+ * creates and destroy databases several times in a row.
+ */
+ public function __destruct() {
+ if ($this->tableDropped && !empty($this->attachedDatabases)) {
+ foreach ($this->attachedDatabases as $prefix) {
+ // Check if the database is now empty, ignore the internal SQLite tables.
+ try {
+ $count = $this->query('SELECT COUNT(*) FROM ' . $prefix . '.sqlite_master WHERE type = :type AND name NOT LIKE :pattern', [':type' => 'table', ':pattern' => 'sqlite_%'])->fetchField();
+
+ // We can prune the database file if it doesn't have any tables.
+ if ($count == 0) {
+ // Detaching the database fails at this point, but no other queries
+ // are executed after the connection is destructed so we can simply
+ // remove the database file.
+ unlink($this->connectionOptions['database'] . '-' . $prefix);
+ }
+ }
+ catch (\Exception $e) {
+ // Ignore the exception and continue. There is nothing we can do here
+ // to report the error or fail safe.
+ }
+ }
+ }
+ }
+
+ /**
+ * Gets all the attached databases.
+ *
+ * @return array
+ * An array of attached database names.
+ *
+ * @see \Drupal\Core\Database\Driver\sqlite\Connection::__construct()
+ */
+ public function getAttachedDatabases() {
+ return $this->attachedDatabases;
+ }
+
+ /**
+ * SQLite compatibility implementation for the IF() SQL function.
+ */
+ public static function sqlFunctionIf($condition, $expr1, $expr2 = NULL) {
+ return $condition ? $expr1 : $expr2;
+ }
+
+ /**
+ * SQLite compatibility implementation for the GREATEST() SQL function.
+ */
+ public static function sqlFunctionGreatest() {
+ $args = func_get_args();
+ foreach ($args as $v) {
+ if (!isset($v)) {
+ unset($args);
+ }
+ }
+ if (count($args)) {
+ return max($args);
+ }
+ else {
+ return NULL;
+ }
+ }
+
+ /**
+ * SQLite compatibility implementation for the CONCAT() SQL function.
+ */
+ public static function sqlFunctionConcat() {
+ $args = func_get_args();
+ return implode('', $args);
+ }
+
+ /**
+ * SQLite compatibility implementation for the CONCAT_WS() SQL function.
+ *
+ * @see http://dev.mysql.com/doc/refman/5.6/en/string-functions.html#function_concat-ws
+ */
+ public static function sqlFunctionConcatWs() {
+ $args = func_get_args();
+ $separator = array_shift($args);
+ // If the separator is NULL, the result is NULL.
+ if ($separator === FALSE || is_null($separator)) {
+ return NULL;
+ }
+ // Skip any NULL values after the separator argument.
+ $args = array_filter($args, function ($value) {
+ return !is_null($value);
+ });
+ return implode($separator, $args);
+ }
+
+ /**
+ * SQLite compatibility implementation for the SUBSTRING() SQL function.
+ */
+ public static function sqlFunctionSubstring($string, $from, $length) {
+ return substr($string, $from - 1, $length);
+ }
+
+ /**
+ * SQLite compatibility implementation for the SUBSTRING_INDEX() SQL function.
+ */
+ public static function sqlFunctionSubstringIndex($string, $delimiter, $count) {
+ // If string is empty, simply return an empty string.
+ if (empty($string)) {
+ return '';
+ }
+ $end = 0;
+ for ($i = 0; $i < $count; $i++) {
+ $end = strpos($string, $delimiter, $end + 1);
+ if ($end === FALSE) {
+ $end = strlen($string);
+ }
+ }
+ return substr($string, 0, $end);
+ }
+
+ /**
+ * SQLite compatibility implementation for the RAND() SQL function.
+ */
+ public static function sqlFunctionRand($seed = NULL) {
+ if (isset($seed)) {
+ mt_srand($seed);
+ }
+ return mt_rand() / mt_getrandmax();
+ }
+
+ /**
+ * SQLite compatibility implementation for the REGEXP SQL operator.
+ *
+ * The REGEXP operator is natively known, but not implemented by default.
+ *
+ * @see http://www.sqlite.org/lang_expr.html#regexp
+ */
+ public static function sqlFunctionRegexp($pattern, $subject) {
+ // preg_quote() cannot be used here, since $pattern may contain reserved
+ // regular expression characters already (such as ^, $, etc). Therefore,
+ // use a rare character as PCRE delimiter.
+ $pattern = '#' . addcslashes($pattern, '#') . '#i';
+ return preg_match($pattern, $subject);
+ }
+
+ /**
+ * SQLite compatibility implementation for the LIKE BINARY SQL operator.
+ *
+ * SQLite supports case-sensitive LIKE operations through the
+ * 'case_sensitive_like' PRAGMA statement, but only for ASCII characters, so
+ * we have to provide our own implementation with UTF-8 support.
+ *
+ * @see https://sqlite.org/pragma.html#pragma_case_sensitive_like
+ * @see https://sqlite.org/lang_expr.html#like
+ */
+ public static function sqlFunctionLikeBinary($pattern, $subject) {
+ // Replace the SQL LIKE wildcard meta-characters with the equivalent regular
+ // expression meta-characters and escape the delimiter that will be used for
+ // matching.
+ $pattern = str_replace(['%', '_'], ['.*?', '.'], preg_quote($pattern, '/'));
+ return preg_match('/^' . $pattern . '$/', $subject);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function prepare($statement, array $driver_options = []) {
+ return new Statement($this->connection, $this, $statement, $driver_options);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function handleQueryException(\PDOException $e, $query, array $args = [], $options = []) {
+ // The database schema might be changed by another process in between the
+ // time that the statement was prepared and the time the statement was run
+ // (e.g. usually happens when running tests). In this case, we need to
+ // re-run the query.
+ // @see http://www.sqlite.org/faq.html#q15
+ // @see http://www.sqlite.org/rescode.html#schema
+ if (!empty($e->errorInfo[1]) && $e->errorInfo[1] === 17) {
+ return $this->query($query, $args, $options);
+ }
+
+ parent::handleQueryException($e, $query, $args, $options);
+ }
+
+ public function queryRange($query, $from, $count, array $args = [], array $options = []) {
+ return $this->query($query . ' LIMIT ' . (int) $from . ', ' . (int) $count, $args, $options);
+ }
+
+ public function queryTemporary($query, array $args = [], array $options = []) {
+ // Generate a new temporary table name and protect it from prefixing.
+ // SQLite requires that temporary tables to be non-qualified.
+ $tablename = $this->generateTemporaryTableName();
+ $prefixes = $this->prefixes;
+ $prefixes[$tablename] = '';
+ $this->setPrefix($prefixes);
+
+ $this->query('CREATE TEMPORARY TABLE ' . $tablename . ' AS ' . $query, $args, $options);
+ return $tablename;
+ }
+
+ public function driver() {
+ return 'sqlite';
+ }
+
+ public function databaseType() {
+ return 'sqlite';
+ }
+
+ /**
+ * Overrides \Drupal\Core\Database\Connection::createDatabase().
+ *
+ * @param string $database
+ * The name of the database to create.
+ *
+ * @throws \Drupal\Core\Database\DatabaseNotFoundException
+ */
+ public function createDatabase($database) {
+ // Verify the database is writable.
+ $db_directory = new \SplFileInfo(dirname($database));
+ if (!$db_directory->isDir() && !drupal_mkdir($db_directory->getPathName(), 0755, TRUE)) {
+ throw new DatabaseNotFoundException('Unable to create database directory ' . $db_directory->getPathName());
+ }
+ }
+
+ public function mapConditionOperator($operator) {
+ return isset(static::$sqliteConditionOperatorMap[$operator]) ? static::$sqliteConditionOperatorMap[$operator] : NULL;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function prepareQuery($query) {
+ return $this->prepare($this->prefixTables($query));
+ }
+
+ public function nextId($existing_id = 0) {
+ $this->startTransaction();
+ // We can safely use literal queries here instead of the slower query
+ // builder because if a given database breaks here then it can simply
+ // override nextId. However, this is unlikely as we deal with short strings
+ // and integers and no known databases require special handling for those
+ // simple cases. If another transaction wants to write the same row, it will
+ // wait until this transaction commits. Also, the return value needs to be
+ // set to RETURN_AFFECTED as if it were a real update() query otherwise it
+ // is not possible to get the row count properly.
+ $affected = $this->query('UPDATE {sequences} SET value = GREATEST(value, :existing_id) + 1', [
+ ':existing_id' => $existing_id,
+ ], ['return' => Database::RETURN_AFFECTED]);
+ if (!$affected) {
+ $this->query('INSERT INTO {sequences} (value) VALUES (:existing_id + 1)', [
+ ':existing_id' => $existing_id,
+ ]);
+ }
+ // The transaction gets committed when the transaction object gets destroyed
+ // because it gets out of scope.
+ return $this->query('SELECT value FROM {sequences}')->fetchField();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFullQualifiedTableName($table) {
+ $prefix = $this->tablePrefix($table);
+
+ // Don't include the SQLite database file name as part of the table name.
+ return $prefix . $table;
+ }
+
+}
projects / yaffs-website / blobdiff