Made dates fields not nullable

Author: x7airworker

src/main/java/org/javawebstack/orm/migration/AutoMigrator.java

@@ -63,7 +63,7 @@ private static void migrateTable(SQLPool pool, TableInfo info, boolean tableExis
                     sb.append('(')
                             .append(parameterTypes)
                             .append(')');
-                sb.append(info.isNotNull(fieldName) ? " NOT NULL" : " NULL");
+                sb.append(info.isNotNull(fieldName) || isDatesField(info, fieldName)  ? " NOT NULL" : " NULL");
                 if (info.isAutoIncrement() && info.getIdField().equals(fieldName))
                     sb.append(" AUTO_INCREMENT");
                 if (columnKeys.containsKey(columnName)) {
@@ -194,4 +194,11 @@ private static List<String> getTables(SQLPool pool) {
         }
     }
 
+    private static boolean isDatesField(TableInfo info, String fieldName) {
+        if (!info.hasDates())
+            return false;
+
+        return fieldName.equals(info.getCreatedField()) || fieldName.equals(info.getUpdatedField());
+    }
+
 }