Initial MSSQL related commit.

framework/db/Connection.php

@@ -242,10 +242,10 @@ class Connection extends Component
 		'mysql' => 'yii\db\mysql\Schema',    // MySQL
 		'sqlite' => 'yii\db\sqlite\Schema',  // sqlite 3
 		'sqlite2' => 'yii\db\sqlite\Schema', // sqlite 2
-		'mssql' => 'yi\db\dao\mssql\Schema', // Mssql driver on windows hosts
-		'sqlsrv' => 'yii\db\mssql\Schema',   // Mssql
+		'sqlsrv' => 'yii\db\mssql\Schema',   // newer MSSQL driver on MS Windows hosts
 		'oci' => 'yii\db\oci\Schema',        // Oracle driver
-		'dblib' => 'yii\db\mssql\Schema',    // dblib drivers on linux (and maybe others os) hosts
+		'mssql' => 'yii\db\mssql\Schema',    // older MSSQL driver on MS Windows hosts
+		'dblib' => 'yii\db\mssql\Schema',    // dblib drivers on GNU/Linux (and maybe other OSes) hosts
 	);
 	/**
 	 * @var Transaction the currently active transaction
@@ -351,7 +351,9 @@ class Connection extends Component
 		$pdoClass = '\PDO';
 		if (($pos = strpos($this->dsn, ':')) !== false) {
 			$driver = strtolower(substr($this->dsn, 0, $pos));
-			if ($driver === 'mssql' || $driver === 'dblib' || $driver === 'sqlsrv') {
+			if ($driver === 'sqlsrv') {
+				$pdoClass = 'yii\db\mssql\SqlsrvPDO';
+			} elseif ($driver === 'mssql' || $driver === 'dblib') {
 				$pdoClass = 'yii\db\mssql\PDO';
 			}
 		}

framework/db/mssql/PDO.php

+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\db\mssql;
+
+/**
+ * This is an extension of default PDO class for MSSQL and DBLIB drivers. It provides workaround for improperly
+ * implemented functionalities of the drivers.
+ *
+ * @author Timur Ruziev <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class PDO extends \PDO
+{
+	/**
+	 * Returns last inserted ID value.
+	 *
+	 * @param string|null sequence the sequence name. Defaults to null.
+	 * @return integer last inserted ID value.
+	 */
+	public function lastInsertId($sequence = null)
+	{
+		return $this->query('SELECT CAST(COALESCE(SCOPE_IDENTITY(), @@IDENTITY) AS bigint)')->fetchColumn();
+	}
+
+	/**
+	 * Begin a transaction.
+	 *
+	 * Is is necessary to override PDO's method as MSSQL PDO drivers does not support transactions.
+	 *
+	 * @return boolean
+	 */
+	public function beginTransaction()
+	{
+		$this->exec('BEGIN TRANSACTION');
+		return true;
+	}
+
+	/**
+	 * Commit a transaction.
+	 *
+	 * Is is necessary to override PDO's method as MSSQL PDO drivers does not support transactions.
+	 *
+	 * @return boolean
+	 */
+	public function commit()
+	{
+		$this->exec('COMMIT TRANSACTION');
+		return true;
+	}
+
+	/**
+	 * Rollback a transaction.
+	 *
+	 * Is is necessary to override PDO's method as MSSQL PDO drivers does not support transaction.
+	 *
+	 * @return boolean
+	 */
+	public function rollBack()
+	{
+		$this->exec('ROLLBACK TRANSACTION');
+		return true;
+	}
+}

framework/db/mssql/QueryBuilder.php

+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\db\mssql;
+
+/**
+ * QueryBuilder is the query builder for MS SQL databases.
+ *
+ * @author Timur Ruziev <resurtm@gmail.com>
+ * @since 2.0
+ */
+class QueryBuilder extends \yii\db\QueryBuilder
+{
+	// TODO: mssql driver
+}

framework/db/mssql/Schema.php

+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\db\mssql;
+
+use yii\db\TableSchema;
+
+/**
+ * Schema is the class for retrieving metadata from a MS SQL database (version 2008 and above).
+ *
+ * @author Timur Ruziev <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class Schema extends \yii\db\Schema
+{
+	/**
+	 * Default schema name to be used.
+	 */
+	const DEFAULT_SCHEMA = 'dbo';
+
+	/**
+	 * @var array mapping from physical column types (keys) to abstract column types (values)
+	 */
+	public $typeMap = array(
+		// TODO: mssql driver
+	);
+
+	/**
+	 * @param string $name
+	 * @return TableSchema
+	 */
+	public function loadTableSchema($name)
+	{
+		return null;
+	}
+
+	/**
+	 * Quotes a table name for use in a query.
+	 * A simple table name has no schema prefix.
+	 * @param string $name table name.
+	 * @return string the properly quoted table name.
+	 */
+	public function quoteSimpleTableName($name)
+	{
+		return strpos($name, '[') !== false ? $name : '[' . $name . ']';
+	}
+
+	/**
+	 * Quotes a column name for use in a query.
+	 * A simple column name has no prefix.
+	 * @param string $name column name.
+	 * @return string the properly quoted column name.
+	 */
+	public function quoteSimpleColumnName($name)
+	{
+		return strpos($name, '[') !== false || $name === '*' ? $name : '[' . $name . ']';
+	}
+
+	/**
+	 * Creates a query builder for the MSSQL database.
+	 * @return QueryBuilder query builder interface.
+	 */
+	public function createQueryBuilder()
+	{
+		return new QueryBuilder($this->db);
+	}
+
+	/**
+	 * Returns all table names in the database.
+	 * This method should be overridden by child classes in order to support this feature
+	 * because the default implementation simply throws an exception.
+	 * @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema.
+	 * @return array all table names in the database. The names have NO the schema name prefix.
+	 */
+	protected function findTableNames($schema = '')
+	{
+		if ('' === $schema) {
+			$schema = self::DEFAULT_SCHEMA;
+		}
+		$sql = "SELECT TABLE_NAME FROM [INFORMATION_SCHEMA].[TABLES] WHERE TABLE_SCHEMA = :schema AND TABLE_TYPE = 'BASE TABLE'";
+		$names = $this->db->createCommand($sql, array(':schema' => $schema))->queryColumn();
+		if (self::DEFAULT_SCHEMA !== $schema) {
+			foreach ($names as $index => $name) {
+				$names[$index] = $schema . '.' . $name;
+			}
+		}
+		return $names;
+	}
+}

framework/db/mssql/SqlsrvPDO.php

+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\db\mssql;
+
+/**
+ * This is an extension of default PDO class for MSSQL SQLSRV driver. It provides workaround for improperly
+ * implemented functionalities of the PDO SQLSRV driver.
+ *
+ * @author Timur Ruziev <resurtm@gmail.com>
+ * @since 2.0
+ */
+class SqlsrvPDO extends \PDO
+{
+	/**
+	 * Returns last inserted ID value.
+	 *
+	 * SQLSRV driver supports PDO::lastInsertId() with one peculiarity: when $sequence value is null
+	 * or empty string it returns empty string. But when parameter is not specified it's working
+	 * as expected and returns actual last inserted ID (like the other PDO drivers).
+	 *
+	 * @param string|null $sequence the sequence name. Defaults to null.
+	 * @return integer last inserted ID value.
+	 */
+	public function lastInsertId($sequence = null)
+	{
+		return !$sequence ? parent::lastInsertId() : parent::lastInsertId($sequence);
+	}
+}