Implemented __sleep in yii\db\Connection

to support serializing the connection object without exceptions.

- Added test for serializing an open connection.
- Added unserialize test

close #10149

framework/CHANGELOG.md

@@ -57,6 +57,7 @@ Yii Framework 2 Change Log
 - Enh #10056: Allowed any callable to be passed to `ActionColumn::$urlCreator` (freezy-sk)
 - Enh #10061: `yii\helpers\BaseInflector::transliterate()` is now public. Introduced different levels of transliteration strictness (silverfire)
 - Enh #10118: Allow easy extension of slug generation in `yii\behaviors\SluggableBehavior` (cebe, hesna)
+- Enh #10149: Made `yii\db\Connection` serializable (Sam Mousa)
 - Enh: Added last resort measure for `FileHelper::removeDirectory()` fail to unlink symlinks under Windows (samdark)
 - Chg #9369: `Yii::$app->user->can()` now returns `false` instead of erroring in case `authManager` component is not configured (creocoder)
 - Chg #9411: `DetailView` now automatically sets container tag ID in case it's not specified (samdark)

framework/db/Connection.php

@@ -945,4 +945,14 @@ class Connection extends Component
 
         return null;
     }
+
+    /**
+     * Close the connection before serializing.
+     * @return array
+     */
+    public function __sleep()
+    {
+        $this->close();
+        return array_keys((array) $this);
+    }
 }

tests/framework/db/ConnectionTest.php

@@ -11,6 +11,7 @@ use yii\db\Transaction;
  */
 class ConnectionTest extends DatabaseTestCase
 {
+
     public function testConstruct()
     {
         $connection = $this->getConnection(false);
@@ -42,6 +43,17 @@ class ConnectionTest extends DatabaseTestCase
         $connection->open();
     }
 
+    public function testSerialize()
+    {
+        $connection = $this->getConnection(false, false);
+        $connection->open();
+        $serialized = serialize($connection);
+        $unserialized = unserialize($serialized);
+        $this->assertInstanceOf('yii\db\Connection', $unserialized);
+
+        $this->assertEquals(123, $connection->createCommand("SELECT 123")->queryScalar());
+    }
+
     public function testGetDriverName()
     {
         $connection = $this->getConnection(false, false);