diff --git a/examples/connecting-to-databases.php b/examples/connecting-to-databases.php
index d9bf4375..cfc5b6a6 100644
--- a/examples/connecting-to-databases.php
+++ b/examples/connecting-to-databases.php
@@ -40,18 +40,7 @@ try {
 echo "</p>\n";
 
 
-// connects to MySQL using DSN
-echo '<p>Connecting to MySQL: ';
-try {
-	dibi::connect('driver=mysql&host=localhost&username=root&password=xxx&database=test&charset=cp1250');
-	echo 'OK';
-} catch (Dibi\Exception $e) {
-	echo get_class($e), ': ', $e->getMessage(), "\n";
-}
-echo "</p>\n";
-
-
-// connects to MySQLi using array
+// connects to MySQLi
 echo '<p>Connecting to MySQLi: ';
 try {
 	dibi::connect([
diff --git a/src/Dibi/Connection.php b/src/Dibi/Connection.php
index 82059fff..776425bc 100644
--- a/src/Dibi/Connection.php
+++ b/src/Dibi/Connection.php
@@ -56,9 +56,11 @@ class Connection implements IConnection
 	public function __construct($config, string $name = null)
 	{
 		if (is_string($config)) {
+			trigger_error(__METHOD__ . '() Configuration should be array.', E_USER_DEPRECATED);
 			parse_str($config, $config);
 
 		} elseif ($config instanceof Traversable) {
+			trigger_error(__METHOD__ . '() Configuration should be array.', E_USER_DEPRECATED);
 			$tmp = [];
 			foreach ($config as $key => $val) {
 				$tmp[$key] = $val instanceof Traversable ? iterator_to_array($val) : $val;
@@ -66,7 +68,7 @@ class Connection implements IConnection
 			$config = $tmp;
 
 		} elseif (!is_array($config)) {
-			throw new \InvalidArgumentException('Configuration must be array, string or object.');
+			throw new \InvalidArgumentException('Configuration must be array.');
 		}
 
 		Helpers::alias($config, 'username', 'user');
diff --git a/tests/dibi/Connection.connect.phpt b/tests/dibi/Connection.connect.phpt
index 44e84eca..25112d18 100644
--- a/tests/dibi/Connection.connect.phpt
+++ b/tests/dibi/Connection.connect.phpt
@@ -30,8 +30,8 @@ test(function () use ($config) { // lazy
 });
 
 
-test(function () use ($config) { // query string
-	$conn = new Connection(http_build_query($config, '', '&'));
+test(function () use ($config) {
+	$conn = new Connection($config);
 	Assert::true($conn->isConnected());
 
 	Assert::null($conn->getConfig('lazy'));