delete from t_icitembase
delete from t_icitemcore
delete from t_icitemcustom
delete from t_icitemmaterial
delete from t_icitemplan
delete from t_Icitemquality
delete from t_icitemstandard
delete from t_item where fitemclassid=2001
delete from t_item where fitemclassid=4
删除客户资料：
delete from t_Organization
delete from t_item where fitemclassid=1
删除供应商资料：
delete from t_Supplier
delete from t_item where fitemclassid=8