Write a trigger on Account when account is insert then calcuate total account those are vendor or buyer

Write a trigger on Account when Account is insert then calculate the  MaxCount for Account Type:Create Two custom field on account one field is AccountType(PickList) and add two value "Vendor" and other is "Buyer" and create Second field MaxCount(Number). when Account is added and AccountType__c = Vendor or Buyer the calculate the No of Account those have AccountType__C = Vendor or Buyer and Add value in MaxCount__c field.


trigger onAccountUpdateAccoutType on Account (before insert) {
      AggregateResult aggResBuyer = [select max(maxcount__c) from account where AccoutType__c='buyer'];
       AggregateResult aggResVendor = [select max(maxcount__c) from account where AccoutType__c='vendor'];
       Integer buyer,vendor;
       if(aggResBuyer.get('expr0')==null)
       {
        buyer=0;
       }
       else
       {
         buyer = integer.valueof(aggResBuyer.get('expr0'));
       
       }
       if(aggResVendor.get('expr0')==null)
       {
        vendor=0;
       }
       else
       {
         vendor = integer.valueof(aggResVendor.get('expr0'));
       }
      
   buyer++;
      vendor++;
     
      
    for(account acc:trigger.new)
    {
        if(acc.AccoutType__c!='none')
        {
            if(acc.AccoutType__c=='buyer')
            {
                acc.maxcount__c=buyer;
                 buyer++;
            }
            else
            {
                acc.maxcount__c=vendor;
                 vendor++;
            }
        }
    }

}

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