@@ -66,22 +66,22 @@ public function getChangeDiff($table, $key) {
         $columns1 = $this->manager->getColumns('source', $table);
         $columns2 = $this->manager->getColumns('target', $table);
 
-        $wrapas = function($arr, $p1, $p2) {
+        $wrapAs = function($arr, $p1, $p2) {
             return array_map(function($el) use ($p1, $p2) {
                 return "`{$p1}`.`{$el}` as `{$p2}{$el}`";
             }, $arr);
         };
 
-        $wrap = function($arr, $p) {
+        $wrapCast = function($arr, $p) {
             return array_map(function($el) use ($p) {
-                return "`{$p}`.`{$el}`";
+                return "CAST(`{$p}`.`{$el}` AS CHAR CHARACTER SET utf8)";
             }, $arr);
         };
 
-        $columns1as = implode(',', $wrapas($columns1, 'a', 's_'));
-        $columns1   = implode(',', $wrap($columns1, 'a'));
-        $columns2as = implode(',', $wrapas($columns2, 'b', 't_'));
-        $columns2   = implode(',', $wrap($columns2, 'b'));
+        $columns1as = implode(',', $wrapAs($columns1, 'a', 's_'));
+        $columns1   = implode(',', $wrapCast($columns1, 'a'));
+        $columns2as = implode(',', $wrapAs($columns2, 'b', 't_'));
+        $columns2   = implode(',', $wrapCast($columns2, 'b'));
 
         $keyCols = implode(' AND ', array_map(function($el) {
             return "a.{$el} = b.{$el}";
 
@@ -25,7 +25,7 @@ public function run() {
             $diff = $diffCalculator->getDiff($params);
 
             // Empty diff
-            if (empty($diff)) {
+            if (empty($diff['schema']) && empty($diff['data'])) {
                 Logger::info("Identical resources");
             } else {
                 // SQL
 
@@ -17,7 +17,7 @@ public function output() {
         $content .= $this->getContent();
         if (is_null($this->params->output)) {
             Logger::info("Writing migration file to ".getcwd()."/migration.sql");
-            file_put_contents('migration', $content);
+            file_put_contents('migration.sql', $content);
         } else {
             Logger::info("Writing migration file to ".$this->params->output);
             return file_put_contents($this->params->output, $content);