silverstripe-mssql/code/MSSQLAzureDatabase.php
2014-07-11 09:46:32 +12:00

106 lines
3.1 KiB
PHP

<?php
/**
* Specific support for SQL Azure databases running on Windows Azure.
* Currently only supports the SQLSRV driver from Microsoft.
*
* Some important things about SQL Azure:
*
* Selecting a database is not supported.
* In order to change the database currently in use, you need to connect to
* the database using the "Database" parameter with sqlsrv_connect()
*
* Multiple active result sets are not supported. This means you can't
* have two query results open at once.
*
* Fulltext indexes are not supported.
*
* @author Sean Harvey <sean at silverstripe dot com>
* @package mssql
*/
class MSSQLAzureDatabase extends MSSQLDatabase {
/**
* List of parameters used to create new Azure connections between databases
*
* @var array
*/
protected $parameters = array();
public function fullTextEnabled() {
return false;
}
public function __construct($parameters) {
$this->connectDatabase($parameters);
}
/**
* Connect to a SQL Azure database with the given parameters.
* @param array $parameters Connection parameters set by environment
* - server: The server, eg, localhost
* - username: The username to log on with
* - password: The password to log on with
* - database: The database to connect to
* - windowsauthentication: Not supported for Azure
*/
protected function connect($parameters) {
$this->parameters = $parameters;
$this->connectDatabase($parameters['database']);
}
/**
* Connect to a database using the provided parameters
*
* @param string $database
*/
protected function connectDatabase($database) {
$parameters = $this->parameters;
$parameters['database'] = $database;
$parameters['multipleactiveresultsets'] = 0;
// Ensure that driver is available (required by PDO)
if(empty($parameters['driver'])) {
$parameters['driver'] = $this->getDatabaseServer();
}
// Notify connector of parameters, instructing the connector
// to connect immediately to the Azure database
$this->connector->connect($parameters, true);
// Configure the connection
$this->query('SET QUOTED_IDENTIFIER ON');
$this->query('SET TEXTSIZE 2147483647');
}
/**
* Switches to the given database.
*
* IMPORTANT: SQL Azure doesn't support "USE", so we need
* to reinitialize the database connection with the requested
* database name.
* @see http://msdn.microsoft.com/en-us/library/windowsazure/ee336288.aspx
*
* @param type $name The database name to switch to
* @param type $create
* @param type $errorLevel
*/
public function selectDatabase($name, $create = false, $errorLevel = E_USER_ERROR) {
$this->fullTextEnabled = null;
if (!$this->schemaManager->databaseExists($name)) {
// Check DB creation permisson
if (!$create) {
if ($errorLevel !== false) {
user_error("Attempted to connect to non-existing database \"$name\"", $errorLevel);
}
// Unselect database
$this->connector->unloadDatabase();
return false;
}
$this->schemaManager->createDatabase($name);
}
$this->connectDatabase($name);
return true;
}
}