Fix #17909: Reset DB schema, transaction, and driver name when the connection is closed

framework/CHANGELOG.md

@@ -23,6 +23,7 @@ Yii Framework 2 Change Log
 - Bug #17875: Use `move_uploaded_file()` function instead of `copy()` and `unlink()` for saving uploaded files in case of POST request (sup-ham)
 - Bug #17884: Fix 0 values in console Table rendered as empty string (mikehaertl)
 - Bug #13749: Fix Yii opens db connection even when hits query cache (shushenghong)
+- Bug #17909: Reset DB schema, transaction, and driver name when the connection is closed (brandonkelly)
 
 2.0.32 January 21, 2020
 -----------------------

framework/db/Connection.php

@@ -654,14 +654,16 @@ class Connection extends Component
         if ($this->pdo !== null) {
             Yii::debug('Closing DB connection: ' . $this->dsn, __METHOD__);
             $this->pdo = null;
-            $this->_schema = null;
-            $this->_transaction = null;
         }
 
         if ($this->_slave) {
             $this->_slave->close();
             $this->_slave = false;
         }
+
+        $this->_schema = null;
+        $this->_transaction = null;
+        $this->_driverName = null;
     }
 
     /**