Initial work with SQL Server connector

Cake/Database/Dialect/SqlserverDialectTrait.php

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+<?php
+/**
+ * PHP Version 5.4
+ *
+ * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
+ * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ *
+ * Licensed under The MIT License
+ * For full copyright and license information, please see the LICENSE.txt
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ * @link          http://cakephp.org CakePHP(tm) Project
+ * @since         CakePHP(tm) v 3.0.0
+ * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
+ */
+namespace Cake\Database\Dialect;
+
+use Cake\Database\SqlDialectTrait;
+
+/**
+ * Contains functions that encapsulates the SQL dialect used by MySQL,
+ * including query translators and schema introspection.
+ */
+trait SqlserverDialectTrait {
+
+	use SqlDialectTrait;
+
+/**
+ *  String used to start a database identifier quoting to make it safe
+ *
+ * @var string
+ */
+	protected $_startQuote = '[';
+
+/**
+ * String used to end a database identifier quoting to make it safe
+ *
+ * @var string
+ */
+	protected $_endQuote = ']';
+
+/**
+ * Returns an dictionary of expressions to be transformed when compiling a Query
+ * to SQL. Array keys are method names to be called in this class
+ *
+ * @return array
+ */
+	protected function _expressionTranslators() {
+		$namespace = 'Cake\Database\Expression';
+		return [
+			$namespace . '\FunctionExpression' => '_transformFunctionExpression'
+		];
+	}
+
+/**
+ * Receives a FunctionExpression and changes it so that it conforms to this
+ * SQL dialect.
+ *
+ * @param Cake\Database\Expression\FunctionExpression
+ * @return void
+ */
+	protected function _transformFunctionExpression(FunctionExpression $expression) {
+		switch ($expression->name()) {
+			case 'CONCAT':
+				// CONCAT function is expressed as exp1 + exp2
+				$expression->name('')->type(' +');
+				break;
+/*
+			@todo Implement prepend method on FunctionExpression
+			case 'DATEDIFF':
+				$expression
+					->name('')
+					->type('-')
+					->iterateParts(function($p) {
+						return new FunctionExpression('DATE', [$p['value']], [$p['type']]);
+					});
+				break;
+*/
+			case 'CURRENT_DATE':
+				$time = new FunctionExpression('GETDATE');
+				$expression->name('CONVERT')->add(['date' => 'literal', $time]);
+				break;
+			case 'CURRENT_TIME':
+				$time = new FunctionExpression('GETDATE');
+				$expression->name('CONVERT')->add(['time' => 'literal', $time]);
+				break;
+			case 'NOW':
+				$expression->name('GETDATE');
+				break;
+		}
+	}
+
+/**
+ * Get the schema dialect.
+ *
+ * Used by Cake\Schema package to reflect schema and
+ * generate schema.
+ *
+ * @return Cake\Database\Schema\MysqlSchema
+ */
+	public function schemaDialect() {
+		return new \Cake\Database\Schema\SqlserverSchema($this);
+	}
+
+}

Cake/Database/Driver/Sqlserver.php

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+<?php
+/**
+ * PHP Version 5.4
+ *
+ * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
+ * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ *
+ * Licensed under The MIT License
+ * For full copyright and license information, please see the LICENSE.txt
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ * @link          http://cakephp.org CakePHP(tm) Project
+ * @since         CakePHP(tm) v 3.0.0
+ * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
+ */
+namespace Cake\Database\Driver;
+
+use Cake\Database\Dialect\SqlserverDialectTrait;
+use PDO;
+
+class Sqlserver extends \Cake\Database\Driver {
+
+	use PDODriverTrait;
+	use SqlserverDialectTrait;
+
+/**
+ * Base configuration settings for Sqlserver driver
+ *
+ * @var array
+ */
+	protected $_baseConfig = [
+		'persistent' => true,
+		'host' => 'localhost\SQLEXPRESS',
+		'login' => '',
+		'password' => '',
+		'database' => 'cake',
+		'encoding' => 'utf8',
+		'flags' => [],
+		'init' => [],
+		'settings' => [],
+		'dsn' => null
+	];
+
+/**
+ * Establishes a connection to the databse server
+ *
+ * @return boolean true on success
+ */
+	public function connect() {
+		if ($this->_connection) {
+			return true;
+		}
+		$config = $this->_config;
+		$config['flags'] += [
+			PDO::ATTR_PERSISTENT => $config['persistent'],
+			PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
+		];
+
+		if (!empty($config['encoding'])) {
+			$config['flags'][PDO::SQLSRV_ATTR_ENCODING] = $config['encoding'];
+		}
+		if (empty($config['dsn'])) {
+			$config['dsn'] = "sqlsrv:server={$config['host']};Database={$config['database']}";
+		}
+
+		$this->_connect($config);
+
+		$connection = $this->connection();
+		if (!empty($config['init'])) {
+			foreach ((array)$config['init'] as $command) {
+				$connection->exec($command);
+			}
+		}
+		if (!empty($config['settings']) && is_array($config['settings'])) {
+			foreach ($config['settings'] as $key => $value) {
+				$connection->exec("SET {$key} {$value}");
+			}
+		}
+		return true;
+	}
+
+/**
+ * Returns whether php is able to use this driver for connecting to database
+ *
+ * @return boolean true if it is valid to use this driver
+ */
+
+	public function enabled() {
+		return in_array('sqlsrv', PDO::getAvailableDrivers());
+	}
+
+}