How can I change language "und" to "en" with VBO?

After upgrading drupal-6 to drupal-7, I cannot see the body content of a specific content type on his edit page.

after a little research I found out that the column "language" in the "field_data_body" table is set to "und" instead of "en",
so I created a "view" with a VBO field (I need to use VBO because I want to add some filter), and added "execute arbitrary php" operation,
but I dont know how to replace the "und" to "en",

Can someone tell me how to do it?

(Sorry for bad English and thanks!)

Edited: I found the proper code:
db_query("UPDATE field_data_body SET language = REPLACE(language, 'und', 'en') WHERE entity_id = $entity->nid");