New db layer - cache_set

  1. INSERT INTO {cache_registry} (serialized, created, expire, headers, DATA, cid) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5) ON DUPLICATE KEY UPDATE serialized=:db_update_placeholder_0, created=:db_update_placeholder_1, expire=:db_update_placeholder_2, headers=:db_update_placeholder_3, DATA=:db_update_placeholder_4