diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index b3c13e5..b7699ac 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -35,6 +35,7 @@ Yii Framework 2 Change Log
 - Enh #1634: Use masked CSRF tokens to prevent BREACH exploits (qiangxue)
 - Enh #1641: Added `BaseActiveRecord::updateAttributes()` (qiangxue)
 - Enh #1646: Added postgresql `QueryBuilder::checkIntegrity` and `QueryBuilder::resetSequence` (Ragazzo)
+- Enh #1645: Added `Connection::$pdoClass` property (Ragazzo)
 - Enh: Added `favicon.ico` and `robots.txt` to defauly application templates (samdark)
 - Enh: Added `Widget::autoIdPrefix` to support prefixing automatically generated widget IDs (qiangxue)
 - Enh: Support for file aliases in console command 'message' (omnilight)
diff --git a/framework/yii/db/Connection.php b/framework/yii/db/Connection.php
index ef5be87..030e6c7 100644
--- a/framework/yii/db/Connection.php
+++ b/framework/yii/db/Connection.php
@@ -253,7 +253,10 @@ class Connection extends Component
 	 * @var Schema the database schema
 	 */
 	private $_schema;
-
+	/**
+     * @var string Custom PDO wrapper class. If not set, it will use "PDO" or "yii\db\mssql\PDO" when MSSQL is used.
+	 */
+	public $pdoClass;
 
 	/**
 	 * Returns a value indicating whether the DB connection is established.
@@ -338,13 +341,17 @@ class Connection extends Component
 	 */
 	protected function createPdoInstance()
 	{
-		$pdoClass = 'PDO';
-		if (($pos = strpos($this->dsn, ':')) !== false) {
-			$driver = strtolower(substr($this->dsn, 0, $pos));
-			if ($driver === 'mssql' || $driver === 'dblib' || $driver === 'sqlsrv') {
-				$pdoClass = 'yii\db\mssql\PDO';
+		$pdoClass = $this->pdoClass;
+		if ($pdoClass === null) {
+			$pdoClass = 'PDO';
+			if (($pos = strpos($this->dsn, ':')) !== false) {
+				$driver = strtolower(substr($this->dsn, 0, $pos));
+				if ($driver === 'mssql' || $driver === 'dblib' || $driver === 'sqlsrv') {
+					$pdoClass = 'yii\db\mssql\PDO';
+				}
 			}
 		}
+
 		return new $pdoClass($this->dsn, $this->username, $this->password, $this->attributes);
 	}