63、saleforce 的 Merchandise 的简单的增删改查

自定义的controllerpublic with sharing class MerchandiseController {    public List<Merchandise__c> merchandises{get;set;}        public List<SelectOption> merchandisePrices = new List<SelectOption>();        public Merchandise__c merchandise{get;set;}        public Boolean isStatus{get;set;}        public String name{get;set;}        public Decimal quantity{get;set;}        public Decimal price{get;set;}        public MerchandiseController(){        merchandises = new List<Merchandise__c>();        refreshData();    }        public List<SelectOption> getPrice(){        merchandisePrices.clear();        merchandisePrices.add(new SelectOption('200','200'));        return merchandisePrices;    }        public void refreshData(){        isStatus = true;        String goodsQueryString = 'SELECT Name,Quantity__c,Price__c from Merchandise__c';        merchandises = Database.query(goodsQueryString);    }        public void save(){        upsert merchandises;    }        public void deleteMerchandises(){        Id id = ApexPages.currentPage().getParameters().get('merchandisesId');        Database.delete(id);        refreshData();    }        public void add(){        if(merchandises == null){            merchandises = new List<Merchandise__c>();        }        Merchandise__c merchandise2 = new Merchandise__c();        System.debug('-----------merchandiseList---------------------'+merchandises);        if(merchandises.size()==0){            merchandises.add(merchandise2);        }else{            merchandises.add(0,merchandise2);        }    }        public void query(){        String goodsQueryString = 'SELECT Name,CreatedBy,LastModifiedBy,Owner,Quantity__c,Price__c from Merchandise__c';        merchandises = Database.query(goodsQueryString);            }    }