Connection.php in Drupal driver for SQL Server and SQL Azure 4.0.x
Same filename in this branch
Same filename and directory in other branches
Namespace
Drupal\sqlsrv\Driver\Database\sqlsrvFile
src/Driver/Database/sqlsrv/Connection.phpView source
<?php
namespace Drupal\sqlsrv\Driver\Database\sqlsrv;
use Drupal\Core\Database\Connection as DatabaseConnection;
use Drupal\Core\Database\Database;
use Drupal\Core\Database\DatabaseAccessDeniedException;
use Drupal\Core\Database\DatabaseException;
use Drupal\Core\Database\DatabaseNotFoundException;
use Drupal\Core\Database\DatabaseNotFoundException;
use Drupal\Core\Database\StatementInterface;
use Drupal\Core\Database\TransactionNoActiveException;
use Drupal\Core\Database\TransactionOutOfOrderException;
use Drupal\Core\Database\TransactionNameNonUniqueException;
/**
* Sqlsvr implementation of \Drupal\Core\Database\Connection.
*/
class Connection extends DatabaseConnection {
/**
* The identifier quote characters for the database type.
*
* An array containing the start and end identifier quote characters for the
* database type. The ANSI SQL standard identifier quote character is a double
* quotation mark.
*
* @var string[]
*/
protected $identifierQuotes = [
'[',
']',
];
/**
* Error code for "Unknown database" error.
*/
const DATABASE_NOT_FOUND = 42000;
/**
* Error code for "Access denied" error.
*/
const ACCESS_DENIED = 28000;
/**
* This is the original replacement regexp from Microsoft.
*
* We could probably simplify it a lot because queries only contain
* placeholders when we modify them.
*
* NOTE: removed 'escape' from the list, because it explodes
* with LIKE xxx ESCAPE yyy syntax.
*/
const RESERVED_REGEXP = '/\\G
# Everything that follows a boundary that is not : or _.
\\b(?<![:\\[_])(?:
# Any reserved words, followed by a boundary that is not an opening parenthesis.
(action|admin|alias|any|are|array|at|begin|boolean|class|commit|contains|current|
data|date|day|depth|domain|external|file|full|function|get|go|host|input|language|
last|less|local|map|min|module|new|no|object|old|open|operation|parameter|parameters|
path|plan|prefix|proc|public|ref|result|returns|role|row|rule|save|search|second|
section|session|size|state|statistics|temporary|than|time|timestamp|tran|translate|
translation|trim|user|value|variable|view|without)
(?!\\()
|
# Or a normal word.
([a-z]+)
)\\b
|
\\b(
[^a-z\'"\\\\]+
)\\b
|
(?=[\'"])
(
" [^\\\\"] * (?: \\\\. [^\\\\"] *) * "
|
\' [^\\\\\']* (?: \\\\. [^\\\\\']*) * \'
)
/Six';
/**
* The schema object for this connection.
*
* Set to NULL when the schema is destroyed.
*
* @var \Drupal\sqlsrv\Driver\Database\sqlsrv\Schema|null
*/
protected $schema = NULL;
/**
* The temporary table prefix.
*
* @var string
*/
protected $tempTablePrefix = '#';
/**
* The connection's unique key for global temporary tables.
*
* @var string
*/
protected $tempKey;
/**
* {@inheritdoc}
*/
public function queryRange($query, $from, $count, array $args = [], array $options = []) {
if (strpos($query, " ORDER BY ") === FALSE) {
$query .= " ORDER BY (SELECT NULL)";
}
$query .= " OFFSET {$from} ROWS FETCH NEXT {$count} ROWS ONLY";
return $this
->query($query, $args, $options);
}
/**
* {@inheritdoc}
*/
public function queryTemporary($query, array $args = [], array $options = []) {
$tablename = $this
->generateTemporaryTableName();
// Having comments in the query can be tricky and break the
// SELECT FROM -> SELECT INTO conversion.
/** @var \Drupal\sqlsrv\Driver\Database\sqlsrv\Schema $schema */
$schema = $this
->schema();
$query = $schema
->removeSQLComments($query);
// Replace SELECT xxx FROM table by SELECT xxx INTO #table FROM table.
$query = preg_replace('/^SELECT(.*?)FROM/is', 'SELECT$1 INTO {' . $tablename . '} FROM', $query);
$this
->query($query, $args, $options);
return $tablename;
}
/**
* {@inheritdoc}
*/
public function driver() {
return 'sqlsrv';
}
/**
* {@inheritdoc}
*/
public function databaseType() {
return 'sqlsrv';
}
/**
* {@inheritdoc}
*/
public function createDatabase($database) {
// Escape the database name.
$database = Database::getConnection()
->escapeDatabase($database);
try {
// Create the database and set it as active.
$this->connection
->exec("CREATE DATABASE {$database}");
} catch (DatabaseException $e) {
throw new DatabaseNotFoundException($e
->getMessage());
}
}
/**
* {@inheritdoc}
*/
public function mapConditionOperator($operator) {
return isset(static::$sqlsrvConditionOperatorMap[$operator]) ? static::$sqlsrvConditionOperatorMap[$operator] : NULL;
}
/**
* {@inheritdoc}
*/
public function nextId($existing = 0) {
// If an exiting value is passed, for its insertion into the sequence table.
if ($existing > 0) {
try {
$sql = 'SET IDENTITY_INSERT {sequences} ON;';
$sql .= ' INSERT INTO {sequences} (value) VALUES(:existing);';
$sql .= ' SET IDENTITY_INSERT {sequences} OFF';
$this
->queryDirect($sql, [
':existing' => $existing,
]);
} catch (\Exception $e) {
// Doesn't matter if this fails, it just means that this value is
// already present in the table.
}
}
// Refactored to use OUTPUT because under high concurrency LAST_INSERTED_ID
// does not work properly.
return $this
->queryDirect('INSERT INTO {sequences} OUTPUT (Inserted.[value]) DEFAULT VALUES')
->fetchField();
}
/**
* {@inheritdoc}
*/
public function __construct(\PDO $connection, array $connection_options) {
$connection
->setAttribute(\PDO::ATTR_STRINGIFY_FETCHES, TRUE);
parent::__construct($connection, $connection_options);
// This driver defaults to transaction support, except if explicitly passed
// FALSE.
$this->transactionalDDLSupport = !isset($connection_options['transactions']) || $connection_options['transactions'] !== FALSE;
// Store connection options for future reference.
$this->connectionOptions = $connection_options;
}
/**
* {@inheritdoc}
*
* Adding schema to the connection URL.
*/
public static function createConnectionOptionsFromUrl($url, $root) {
$database = parent::createConnectionOptionsFromUrl($url, $root);
$url_components = parse_url($url);
if (isset($url_components['query'])) {
$query = [];
parse_str($url_components['query'], $query);
if (isset($query['schema'])) {
$database['schema'] = $query['schema'];
}
$database['cache_schema'] = isset($query['cache_schema']) && $query['cache_schema'] == 'true' ? TRUE : FALSE;
}
return $database;
}
/**
* {@inheritdoc}
*
* Adding schema to the connection URL.
*/
public static function createUrlFromConnectionOptions(array $connection_options) {
if (!isset($connection_options['driver'], $connection_options['database'])) {
throw new \InvalidArgumentException("As a minimum, the connection options array must contain at least the 'driver' and 'database' keys");
}
$user = '';
if (isset($connection_options['username'])) {
$user = $connection_options['username'];
if (isset($connection_options['password'])) {
$user .= ':' . $connection_options['password'];
}
$user .= '@';
}
$host = empty($connection_options['host']) ? 'localhost' : $connection_options['host'];
$db_url = $connection_options['driver'] . '://' . $user . $host;
if (isset($connection_options['port'])) {
$db_url .= ':' . $connection_options['port'];
}
$db_url .= '/' . $connection_options['database'];
$query = [];
if (isset($connection_options['module'])) {
$query['module'] = $connection_options['module'];
}
if (isset($connection_options['schema'])) {
$query['schema'] = $connection_options['schema'];
}
if (isset($connection_options['cache_schema'])) {
$query['cache_schema'] = $connection_options['cache_schema'];
}
if (count($query) > 0) {
$parameters = [];
foreach ($query as $key => $values) {
$parameters[] = $key . '=' . $values;
}
$query_string = implode("&", $parameters);
$db_url .= '?' . $query_string;
}
if (isset($connection_options['prefix']['default']) && $connection_options['prefix']['default'] !== '') {
$db_url .= '#' . $connection_options['prefix']['default'];
}
return $db_url;
}
/**
* {@inheritdoc}
*
* Allowing local or global temp tables.
*/
protected function generateTemporaryTableName() {
// In case the user changes to global temp tables.
if (!isset($this->tempKey)) {
$this->tempKey = md5(rand());
}
$tablename = parent::generateTemporaryTableName() . '_' . $this->tempKey;
return $tablename;
}
/**
* {@inheritdoc}
*
* Including schema name.
*/
public function getFullQualifiedTableName($table) {
$options = $this
->getConnectionOptions();
$prefix = $this
->tablePrefix($table);
$schema_name = $this->schema
->getDefaultSchema();
return $options['database'] . '.' . $schema_name . '.' . $prefix . $table;
}
/**
* {@inheritdoc}
*
* Uses SQL Server format.
*/
public static function open(array &$connection_options = []) {
// Build the DSN.
$options = [];
$options['Server'] = $connection_options['host'] . (!empty($connection_options['port']) ? ',' . $connection_options['port'] : '');
// We might not have a database in the
// connection options, for example, during
// database creation in Install.
if (!empty($connection_options['database'])) {
$options['Database'] = $connection_options['database'];
}
// Build the DSN.
$dsn = 'sqlsrv:';
foreach ($options as $key => $value) {
$dsn .= (empty($key) ? '' : "{$key}=") . $value . ';';
}
// Allow PDO options to be overridden.
$connection_options += [
'pdo' => [],
];
$connection_options['pdo'] += [
\PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION,
];
// Set a Statement class, unless the driver opted out.
// $connection_options['pdo'][PDO::ATTR_STATEMENT_CLASS] =
// array(Statement::class, array(Statement::class));.
// Actually instantiate the PDO.
try {
$pdo = new \PDO($dsn, $connection_options['username'], $connection_options['password'], $connection_options['pdo']);
} catch (\PDOException $e) {
if ($e
->getCode() == static::DATABASE_NOT_FOUND) {
throw new DatabaseNotFoundException($e
->getMessage(), $e
->getCode(), $e);
}
if ($e
->getCode() == static::ACCESS_DENIED) {
throw new DatabaseAccessDeniedException($e
->getMessage(), $e
->getCode(), $e);
}
throw $e;
}
return $pdo;
}
/**
* Prepares a query string and returns the prepared statement.
*
* This method caches prepared statements, reusing them when possible. It also
* prefixes tables names enclosed in curly-braces and, optionally, quotes
* identifiers enclosed in square brackets.
*
* @param $query
* The query string as SQL, with curly-braces surrounding the
* table names.
* @param bool $quote_identifiers
* (optional) Quote any identifiers enclosed in square brackets. Defaults to
* TRUE.
*
* @return \Drupal\Core\Database\StatementInterface
* A PDO prepared statement ready for its execute() method.
*
* @deprecated in drupal:9.1.0 and is removed from drupal:10.0.0. Use
* ::prepareStatement instead.
*
* @see https://www.drupal.org/node/3137786
*/
public function prepareQuery($query, $quote_identifiers = TRUE) {
@trigger_error('Connection::prepareQuery() is deprecated in drupal:9.1.0 and is removed from drupal:10.0.0. Use ::prepareStatement() instead. See https://www.drupal.org/node/3137786', E_USER_DEPRECATED);
return $this
->prepareStatement($query, [
'allow_square_brackets' => !$quote_identifiers,
]);
}
/**
* {@inheritdoc}
*
* @return \Drupal\Core\Database\Statement
* A PDO prepared statement ready for its execute() method.
*/
public function prepareStatement(string $query, array $options) : StatementInterface {
$default_options = [
'emulate_prepares' => FALSE,
'bypass_preprocess' => FALSE,
];
// Merge default statement options. These options are
// only specific for this preparation and will only override
// the global configuration if set to different than NULL.
$options += $default_options;
// Preprocess the query.
if (!$options['bypass_preprocess']) {
$query = $this
->preprocessQuery($query);
}
$driver_options = [];
if ($options['emulate_prepares'] === TRUE) {
// Never use this when you need special column binding.
// Unlike other PDO drivers, sqlsrv requires this attribute be set
// on the statement, not the connection.
$driver_options['pdo'][\PDO::ATTR_EMULATE_PREPARES] = TRUE;
$driver_options['pdo'][\PDO::SQLSRV_ATTR_ENCODING] = \PDO::SQLSRV_ENCODING_UTF8;
}
// We run the statements in "direct mode" because the way PDO prepares
// statement in non-direct mode cause temporary tables to be destroyed
// at the end of the statement.
// If you are using the PDO_SQLSRV driver and you want to execute a query
// that changes a database setting (e.g. SET NOCOUNT ON), use the PDO::query
// method with the PDO::SQLSRV_ATTR_DIRECT_QUERY attribute.
// http://blogs.iis.net/bswan/archive/2010/12/09/how-to-change-database-settings-with-the-pdo-sqlsrv-driver.aspx
// If a query requires the context that was set in a previous query,
// you should execute your queries with PDO::SQLSRV_ATTR_DIRECT_QUERY set to
// True. For example, if you use temporary tables in your queries,
// PDO::SQLSRV_ATTR_DrIRECT_QUERY must be set to True.
$driver_options['pdo'][\PDO::SQLSRV_ATTR_DIRECT_QUERY] = TRUE;
// It creates a cursor for the query, which allows you to iterate over the
// result set without fetching the whole result at once. A scrollable
// cursor, specifically, is one that allows iterating backwards.
// https://msdn.microsoft.com/en-us/library/hh487158%28v=sql.105%29.aspx
$driver_options['pdo'][\PDO::ATTR_CURSOR] = \PDO::CURSOR_SCROLL;
// Lets you access rows in any order. Creates a client-side cursor query.
$driver_options['pdo'][\PDO::SQLSRV_ATTR_CURSOR_SCROLL_TYPE] = \PDO::SQLSRV_CURSOR_BUFFERED;
$query = $this
->prefixTables($query);
if (!($options['allow_square_brackets'] ?? FALSE)) {
$query = $this
->quoteIdentifiers($query);
}
/** @var \Drupal\Core\Database\Statement $stmt */
$stmt = $this->connection
->prepare($query, $options['pdo'] ?? []);
return $stmt;
}
/**
* {@inheritdoc}
*
* SQL Server does not support RELEASE SAVEPOINT.
*/
protected function popCommittableTransactions() {
// Commit all the committable layers.
foreach (array_reverse($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)) {
$this
->doCommit();
}
else {
// Nothing to do in SQL Server.
}
}
}
/**
* {@inheritdoc}
*
* Using SQL Server query syntax.
*/
public function pushTransaction($name) {
if (!$this
->supportsTransactions()) {
return;
}
if (isset($this->transactionLayers[$name])) {
throw new TransactionNameNonUniqueException($name . " is already in use.");
}
// If we're already in a transaction then we want to create a savepoint
// rather than try to create another transaction.
if ($this
->inTransaction()) {
$this
->queryDirect('SAVE TRANSACTION ' . $name);
}
else {
$this->connection
->beginTransaction();
}
$this->transactionLayers[$name] = $name;
}
/**
* Executes a query string against the database.
*
* This method provides a central handler for the actual execution of every
* query. All queries executed by Drupal are executed as PDO prepared
* statements.
*
* This method is overriden to manage EMULATE_PREPARE
* behaviour to prevent some compatibility issues with SQL Server.
*
* @param string|\Drupal\Core\Database\Statement $query
* The query to execute. In most cases this will be a string containing
* an SQL query with placeholders. An already-prepared instance of
* StatementInterface may also be passed in order to allow calling
* code to manually bind variables to a query. If a
* StatementInterface is passed, the $args array will be ignored.
* It is extremely rare that module code will need to pass a statement
* object to this method. It is used primarily for database drivers for
* databases that require special LOB field handling.
* @param array $args
* An array of arguments for the prepared statement. If the prepared
* statement uses ? placeholders, this array must be an indexed array.
* If it contains named placeholders, it must be an associative array.
* @param mixed $options
* An associative array of options to control how the query is run. The
* given options will be merged with self::defaultOptions(). See the
* documentation for self::defaultOptions() for details.
* Typically, $options['return'] will be set by a default or by a query
* builder, and should not be set by a user.
*
* @return \Drupal\Core\Database\Statement|int|string|null
* This method will return one of the following:
* - If either $options['return'] === self::RETURN_STATEMENT, or
* $options['return'] is not set (due to self::defaultOptions()),
* returns the executed statement.
* - If $options['return'] === self::RETURN_AFFECTED,
* returns the number of rows affected by the query
* (not the number matched).
* - If $options['return'] === self::RETURN_INSERT_ID,
* returns the generated insert ID of the last query.
* - If either $options['return'] === self::RETURN_NULL, or
* an exception occurs and $options['throw_exception'] evaluates to FALSE,
* returns NULL.
*
* @throws \Drupal\Core\Database\DatabaseExceptionWrapper
* @throws \Drupal\Core\Database\IntegrityConstraintViolationException
* @throws \InvalidArgumentException
*
* @see \Drupal\Core\Database\Connection::defaultOptions()
*/
public function query($query, array $args = [], $options = []) {
// Use default values if not already set.
$options += $this
->defaultOptions();
if (isset($options['target'])) {
@trigger_error('Passing a \'target\' key to \\Drupal\\Core\\Database\\Connection::query $options argument is deprecated in drupal:8.8.0 and will be removed before drupal:9.0.0. Instead, use \\Drupal\\Core\\Database\\Database::getConnection($target)->query(). See https://www.drupal.org/node/2993033', E_USER_DEPRECATED);
}
$stmt = NULL;
try {
// We allow either a pre-bound statement object or a literal string.
// In either case, we want to end up with an executed statement object,
// which we pass to PDOStatement::execute.
if ($query instanceof StatementInterface) {
$stmt = $query;
$stmt
->execute(NULL, $options);
}
else {
$this
->expandArguments($query, $args);
$query = rtrim($query, "; \t\n\r\0\v");
if (strpos($query, ';') !== FALSE && empty($options['allow_delimiter_in_query'])) {
throw new \InvalidArgumentException('; is not supported in SQL strings. Use only one statement at a time.');
}
$emulate = isset($options['emulate_prepares']) ? $options['emulate_prepares'] : FALSE;
// Try to detect duplicate place holders, this check's performance
// is not a good addition to the driver, but does a good job preventing
// duplicate placeholder errors.
$argcount = count($args);
if ($emulate === TRUE || $argcount >= 2100 || $argcount != substr_count($query, ':')) {
$emulate = TRUE;
}
// Replace CONCAT_WS to ensure SQL Server 2016 compatibility.
while (($pos1 = strpos($query, 'CONCAT_WS')) !== FALSE) {
// We assume the the separator does not contain any single-quotes
// and none of the arguments contain commas.
$pos2 = $this
->findParenMatch($query, $pos1 + 9);
$argument_list = substr($query, $pos1 + 10, $pos2 - 10 - $pos1);
$arguments = explode(', ', $argument_list);
$closing_quote_pos = stripos($argument_list, '\'', 1);
$separator = substr($argument_list, 1, $closing_quote_pos - 1);
$strings_list = substr($argument_list, $closing_quote_pos + 3);
$arguments = explode(', ', $strings_list);
$replace = "STUFF(";
$coalesce = [];
foreach ($arguments as $argument) {
if (substr($argument, 0, 1) == ':') {
$args[$argument . '_sqlsrv_concat'] = $args[$argument];
$coalesce[] = "CASE WHEN {$argument} IS NULL THEN '' ELSE CONCAT('{$separator}', {$argument}_sqlsrv_concat) END";
}
else {
$coalesce[] = "CASE WHEN {$argument} IS NULL THEN '' ELSE CONCAT('{$separator}', {$argument}) END";
}
}
$coalesce_string = implode(' + ', $coalesce);
$sep_len = strlen($separator);
$replace = "STUFF({$coalesce_string}, 1, {$sep_len}, '')";
$query = substr($query, 0, $pos1) . $replace . substr($query, $pos2 + 1);
}
$stmt = $this
->prepareStatement($query, [
'emulate_prepares' => $emulate,
]);
$stmt
->execute($args, $options);
}
// Depending on the type of query we may need to return a different value.
// See DatabaseConnection::defaultOptions() for a description of each
// value.
switch ($options['return']) {
case Database::RETURN_STATEMENT:
return $stmt;
case Database::RETURN_AFFECTED:
$stmt->allowRowCount = TRUE;
return $stmt
->rowCount();
case Database::RETURN_INSERT_ID:
return $this->connection
->lastInsertId();
case Database::RETURN_NULL:
return NULL;
default:
throw new \PDOException('Invalid return directive: ' . $options['return']);
}
} catch (\PDOException $e) {
// Most database drivers will return NULL here, but some of them
// (e.g. the SQLite driver) may need to re-run the query, so the return
// value will be the same as for static::query().
return $this
->handleQueryException($e, $query, $args, $options);
}
}
/**
* {@inheritdoc}
*
* Using SQL Server query syntax.
*/
public function rollBack($savepoint_name = 'drupal_transaction') {
if (!$this
->supportsTransactions()) {
return;
}
if (!$this
->inTransaction()) {
throw new TransactionNoActiveException();
}
// A previous rollback to an earlier savepoint may mean that the savepoint
// in question has already been accidentally committed.
if (!isset($this->transactionLayers[$savepoint_name])) {
throw new TransactionNoActiveException();
}
// We need to find the point we're rolling back to, all other savepoints
// before are no longer needed. If we rolled back other active savepoints,
// we need to throw an exception.
$rolled_back_other_active_savepoints = FALSE;
while ($savepoint = array_pop($this->transactionLayers)) {
if ($savepoint == $savepoint_name) {
// If it is the last the transaction in the stack, then it is not a
// savepoint, it is the transaction itself so we will need to roll back
// the transaction rather than a savepoint.
if (empty($this->transactionLayers)) {
break;
}
$this
->query('ROLLBACK TRANSACTION ' . $savepoint);
$this
->popCommittableTransactions();
if ($rolled_back_other_active_savepoints) {
throw new TransactionOutOfOrderException();
}
return;
}
else {
$rolled_back_other_active_savepoints = TRUE;
}
}
// Notify the callbacks about the rollback.
$callbacks = $this->rootTransactionEndCallbacks;
$this->rootTransactionEndCallbacks = [];
foreach ($callbacks as $callback) {
call_user_func($callback, FALSE);
}
$this->connection
->rollBack();
if ($rolled_back_other_active_savepoints) {
throw new TransactionOutOfOrderException();
}
}
/**
* {@inheritdoc}
*
* Adding logic for temporary tables.
*/
protected function setPrefix($prefix) {
parent::setPrefix($prefix);
// Add this to the front of the array so it is done before
// the default action.
array_unshift($this->prefixSearch, '{db_temporary_');
// If there is a period in the prefix, apply the temp prefix to the final
// piece.
$default_parts = explode('.', $this->prefixes['default']);
$table_part = array_pop($default_parts);
$default_parts[] = '[' . $this->tempTablePrefix . $table_part;
$full_prefix = implode('.', $default_parts);
array_unshift($this->prefixReplace, $full_prefix . 'db_temporary_');
}
/**
* {@inheritdoc}
*
* Adding logic for temporary tables.
*/
public function tablePrefix($table = 'default') {
if (isset($this->prefixes[$table])) {
return $this->prefixes[$table];
}
$temp_prefix = '';
if ($this
->isTemporaryTable($table)) {
$temp_prefix = $this->tempTablePrefix;
// If there is a period in the prefix, apply the temp prefix to the final
// piece.
$default_parts = explode('.', $this->prefixes['default']);
$table_part = array_pop($default_parts);
$default_parts[] = $this->tempTablePrefix . $table_part;
return implode('.', $default_parts);
}
return $this->prefixes['default'];
}
/**
* Given a string find the matching parenthesis after the given point.
*
* @param string $string
* The input string.
* @param int $start_paren
* The 0 indexed position of the open-paren, for which we would like
* to find the matching closing-paren.
*
* @return int|false
* The 0 indexed position of the close paren.
*/
private function findParenMatch($string, $start_paren) {
if ($string[$start_paren] !== '(') {
return FALSE;
}
$str_array = str_split(substr($string, $start_paren + 1));
$paren_num = 1;
foreach ($str_array as $i => $char) {
if ($char == '(') {
$paren_num++;
}
elseif ($char == ')') {
$paren_num--;
}
if ($paren_num == 0) {
return $i + $start_paren + 1;
}
}
return FALSE;
}
/**
* The temporary table prefix.
*
* @return string
* The temporary table prefix.
*/
public function getTempTablePrefix() {
return $this->tempTablePrefix;
}
/**
* Is this table a temporary table?
*
* @var string $table
* The table name.
*
* @return bool
* True is the table is a temporary table.
*/
public function isTemporaryTable($table) {
return stripos($table, 'db_temporary_') !== FALSE;
}
/**
* Like query but with no query preprocessing.
*
* The caller is sure that the query is MS SQL compatible! Used internally
* from the schema class, but could be called from anywhere.
*
* @param string $query
* Query.
* @param array $args
* Query arguments.
* @param mixed $options
* Query options.
*
* @throws \PDOException
*
* @return mixed
* Query result.
*/
public function queryDirect($query, array $args = [], $options = []) {
// Use default values if not already set.
$options += $this
->defaultOptions();
$stmt = NULL;
try {
// Core tests run faster without emulating.
$direct_query_options = [
'direct_query' => TRUE,
'bypass_preprocess' => TRUE,
'emulate_prepares' => FALSE,
];
$stmt = $this
->prepareStatement($query, $direct_query_options + $options);
$stmt
->execute($args, $options);
// Depending on the type of query we may need to return a different value.
// See DatabaseConnection::defaultOptions() for a description of each
// value.
switch ($options['return']) {
case Database::RETURN_STATEMENT:
return $stmt;
case Database::RETURN_AFFECTED:
$stmt->allowRowCount = TRUE;
return $stmt
->rowCount();
case Database::RETURN_INSERT_ID:
return $this->connection
->lastInsertId();
case Database::RETURN_NULL:
return NULL;
default:
throw new \PDOException('Invalid return directive: ' . $options['return']);
}
} catch (\PDOException $e) {
// Most database drivers will return NULL here, but some of them
// (e.g. the SQLite driver) may need to re-run the query, so the return
// value will be the same as for static::query().
return $this
->handleQueryException($e, $query, $args, $options);
}
}
/**
* Massage a query to make it compliant with SQL Server.
*
* @param mixed $query
* Query string.
*
* @return string
* Query string in MS SQL format.
*/
public function preprocessQuery($query) {
// Last chance to modify some SQL Server-specific syntax.
$replacements = [];
// Add prefixes to Drupal-specific functions.
/** @var \Drupal\sqlsrv\Driver\Database\sqlsrv\Schema $schema */
$schema = $this
->schema();
$defaultSchema = $schema
->GetDefaultSchema();
foreach ($schema
->DrupalSpecificFunctions() as $function) {
$replacements['/\\b(?<![:.])(' . preg_quote($function) . ')\\(/i'] = "{$defaultSchema}.\$1(";
}
// Rename some functions.
$funcs = [
'LENGTH' => 'LEN',
'POW' => 'POWER',
];
foreach ($funcs as $function => $replacement) {
$replacements['/\\b(?<![:.])(' . preg_quote($function) . ')\\(/i'] = $replacement . '(';
}
// Replace the ANSI concatenation operator with SQL Server poor one.
$replacements['/\\|\\|/'] = '+';
// Now do all the replacements at once.
$query = preg_replace(array_keys($replacements), array_values($replacements), $query);
return $query;
}
/**
* A map of condition operators to sqlsrv operators.
*
* SQL Server doesn't need special escaping for the \ character in a string
* literal, because it uses '' to escape the single quote, not \'.
*
* @var array
*/
protected static $sqlsrvConditionOperatorMap = [
// These can be changed to 'LIKE' => ['postfix' => " ESCAPE '\\'"],
// if https://bugs.php.net/bug.php?id=79276 is fixed.
'LIKE' => [],
'NOT LIKE' => [],
'LIKE BINARY' => [
'operator' => 'LIKE',
],
];
}Classes
Name |
Description |
|---|---|
| Connection | Sqlsvr implementation of \Drupal\Core\Database\Connection. |