apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/repository/ItemRepository.java/ItemRepository/deleteByNamespaceId
class ItemRepository:  @Modifying
  @Query("update Item set isdeleted=1,DataChange_LastModifiedBy = ?2 where namespaceId = ?1")
  int deleteByNamespaceId(long namespaceId, String operator);