Changes of ClientsDaoImpl and Ban
Revert "Changes of ClientsDaoImpl and Ban"

This reverts commit 100bb07d76ebaec92ed8a4badc2d50d428dda5d7.
Revert "Revert "Changes of ClientsDaoImpl and Ban""

This reverts commit 13316622b9013ace6369364ea34c315cc05fccc2.
Changes in ClientsDaoImpl and ClientsService