Fix(migrations) Handle transaction within migrations on MySQL and php v8

lib/Doctrine/Export.php

@@ -1221,7 +1221,7 @@ public function exportClasses(array $classes)
                  }
              }
 
-             $connection->commit();
+             Doctrine_TransactionHelper::commitIfInTransaction($connection);
          }
      }
 

lib/Doctrine/Migration.php

@@ -335,24 +335,21 @@ public function migrate($to = null, $dryRun = false)
 
             if ($dryRun) {
                 return false;
-            } else {
-                $this->_throwErrorsException();
-            }
-        } else {
-            if ($dryRun) {
-                $this->_connection->rollback();
-                if ($this->hasErrors()) {
-                    return false;
-                } else {
-                    return $to;
-                }
-            } else {
-                $this->_connection->commit();
-                $this->setCurrentVersion($to);
-                return $to;
             }
+
+            $this->_throwErrorsException();
+        }
+
+        if ($dryRun) {
+            $this->_connection->rollback();
+
+            return !$this->hasErrors();
         }
-        return false;
+
+        Doctrine_TransactionHelper::commitIfInTransaction($this->_connection);
+        $this->setCurrentVersion($to);
+
+        return true;
     }
 
     /**
@@ -437,8 +434,9 @@ public function getMigrationClass($num)
     /**
      * Throw an exception with all the errors trigged during the migration
      *
-     * @return void
-     * @throws Doctrine_Migration_Exception $e
+     * @throws Doctrine_Migration_Exception
+     *
+     * @return never
      */
     protected function _throwErrorsException()
     {
@@ -559,4 +557,4 @@ protected function _createMigrationTable()
             return false;
         }
     }
-}
+}

lib/Doctrine/TransactionHelper.php

@@ -0,0 +1,24 @@
+<?php
+
+/**
+ * Helper for transactions handling.
+ *
+ * @author Kyle McGrogan <[email protected]>
+ */
+final class Doctrine_TransactionHelper
+{
+    /**
+     * Execute a commit on the given connection, only if a transaction already started.
+     */
+    public static function commitIfInTransaction(Doctrine_Connection $connection): void
+    {
+        $handler = $connection->getDbh();
+
+        // Attempt to commit while no transaction is running results in exception since PHP 8 + pdo_mysql combination
+        if ($handler instanceof PDO && !$handler->inTransaction()) {
+            return;
+        }
+
+        $connection->commit();
+    }
+}