Fixes #16126: Allows to configure `Connection::dsn` by config array

framework/CHANGELOG.md

@@ -49,6 +49,7 @@ Yii Framework 2 Change Log
 - Chg #15481: Removed `yii\BaseYii::powered()` method (Kolyunya, samdark)
 - Chg #15811: Fixed issue with additional parameters on `yii\base\View::renderDynamic()` while parameters contains single quote introduced in #12938 (xicond)
 - Enh #16054: Callback execution with mutex synchronization (zhuravljov)
+- Enh #16126: Allows to configure `Connection::dsn` by config array (leandrogehlen)
 
 2.0.14.2 under development
 ------------------------

framework/db/Connection.php

@@ -426,6 +426,15 @@ class Connection extends Component
      */
     private $_queryCacheInfo = [];
 
+    /**
+    * {@inheritdoc}
+    */
+    public function init()
+    {
+       if (is_array($this->dsn)) {
+           $this->dsn = $this->buildDSN($this->dsn);
+       }
+    }
 
     /**
      * Returns a value indicating whether the DB connection is established.
@@ -1111,6 +1120,29 @@ class Connection extends Component
     }
 
     /**
+     * Build the Data Source Name or DSN
+     * @param array $config the DSN configurations
+     * @return string the formated DSN
+     * @throws InvalidConfigException if 'driver' key was not defined
+     */
+    private function buildDSN(array $config)
+    {
+        if (isset($config['driver'])) {
+            $parts = [];
+            $driver = $config['driver'];
+            unset($config['driver']);
+
+            foreach ($config as $key => $value) {
+                $parts[] = "$key=$value";
+            }
+
+            return "$driver:" . implode(';', $parts);
+        } else {
+            throw new InvalidConfigException("Connection 'driver' must be set.");
+        }
+    }
+
+    /**
      * Close the connection before serializing.
      * @return array
      */

tests/framework/db/ConnectionTest.php

@@ -434,4 +434,20 @@ abstract class ConnectionTest extends DatabaseTestCase
         $this->assertNotNull($slavePdo);
         $this->assertNotSame($masterPdo, $slavePdo);
     }
+
+    public function testDSNConfig()
+    {
+        $dsn = [
+            'driver' => 'mysql',
+            'host' => '127.0.0.1',
+            'dbname' => 'yiitest'
+        ];
+
+        $connection = new Connection(['dsn' => $dsn]);
+        $this->assertEquals('mysql:host=127.0.0.1;dbname=yiitest', $connection->dsn);
+
+        unset($dsn['driver']);
+        $this->expectException('yii\base\InvalidConfigException');
+        $connection = new Connection(['dsn' => $dsn]);
+    }
 }