- Added Database::dryRun(callable) for dry run simulations. This could be especially useful in unittesting-environments. InnoDB only (mysql).

Author: rkrx

src/Database.php

@@ -101,4 +101,11 @@ public function transactionRollback();
 	 * @throws \Exception
 	 */
 	public function transaction($tries = 1, $callback = null);
+
+	/**
+	 * @param callable|null $callback
+	 * @return mixed
+	 * @throws \Exception
+	 */
+	public function dryRun($callback = null);
 }

src/Databases/MySQL.php

@@ -256,6 +256,28 @@ public function transactionRollback() {
 		});
 	}
 
+	/**
+	 * @param callable|null $callback
+	 * @return mixed
+	 * @throws \Exception
+	 * @throws null
+	 */
+	public function dryRun($callback = null) {
+		$result = null;
+		$exception = null;
+		$this->transactionStart();
+		try {
+			$result = call_user_func($callback, $this);
+		} catch (\Exception $e) {
+			$exception = $e;
+		}
+		$this->transactionRollback();
+		if($exception !== null) {
+			throw $exception;
+		}
+		return $result;
+	}
+
 	/**
 	 * @param int|callable $tries
 	 * @param callable|null $callback