Change mandatory attribute in Entity Service

Question

I have an Entity Service E with attributes A and B as mandatory attributes. I changed attribute B and made it non-mandatory and deployed. But the backend table in the database doesn't change and it still has B as NOT NULL attribute. Any attempt to create a new value results in an error from database saying cannot assign NULL to NOT NULL attribute.
Don't want to change the database manually. Is there any way to make the change in the database without dropping the column or the table?

Answer 1

Hi Vivek,
1st Take a Value_Node(say “CustomerDetails”) in the WebDynpro context with the attributes(Say “CustNumber”,” CustName”and “CustType”)  that your Caf_Entity_Service Say “Customer” with attributes “CustNo”,”CustName” and “CustType”)  have .Then Bind the Value_Node into the View(By using “Apply Template” =>”Table”=>Choose the Value_Node then Next Choose ”Input Field” Editor).
Now Inside the Action of the “NewLine” Button put use This.
wdThis.wdGet<Name Of Your Component>Controller().createCustomerDetails();
Now Take an button say “SAVE” and inside the action of “SAVE” button use this Code.
wdContext.nodeACustomer().invalidate();
for(int i = 0;i<wdContext.nodeCustomerDetails().size();i++)
String cnum =  wdContext.nodeCustomerDetails().getCustomerDetailsElementAt(i).getCustNumber();
String cname = wdContext.nodeCustomerDetails().getCustomerDetailsElementAt(i).getCustName();
String ctype = wdContext.nodeCustomerDetails().getCustomerDetailsElementAt(i).getCustType();
try
ACustomer custM = CustomerServiceProxy.create(); //create a new dummy record in caf model with local guid  
custM.setCustNo(cnum);
custM.setCustName(cname);
custM.setCustType(ctype);
custM.getAspect().sendChanges();//populate the dummy record with custom fields and with valid system fields also.
IServiceFacade serviceFacadeProdConf = CAFServiceFactory.getServiceFacade(<Your Caf Model Name>Definition.class)
serviceFacadeProdConf.save();
catch(Exception e)
wdComponentAPI.getMessageManager().reportException("CAN'T CREATE NEW RECORD WITH CUSTOMER ID : "+cnum ,false);
}// end of for loop
Regards,
Mithu