如何使用 Restful ABAP Programming 编程模型开发一个支持增删改查的 Fiori 应用

@EndUserText.label : 'Database table for travel data XXX'
@AbapCatalog.enhancementCategory : #NOT_EXTENSIBLE
@AbapCatalog.tableCategory : #TRANSPARENT
@AbapCatalog.deliveryClass : #A
@AbapCatalog.dataMaintenance : #LIMITED
define table ztravel_jerry {
  key client      : abap.clnt not null;
  key travel_id   : /dmo/travel_id not null;
  agency_id       : /dmo/agency_id;
  customer_id     : /dmo/customer_id;
  begin_date      : /dmo/begin_date;
  end_date        : /dmo/end_date;
  @Semantics.amount.currencyCode : 'ztravel_jerry.currency_code'
  booking_fee     : /dmo/booking_fee;
  @Semantics.amount.currencyCode : 'ztravel_jerry.currency_code'
  total_price     : /dmo/total_price;
  currency_code   : /dmo/currency_code;
  description     : /dmo/description;
  created_by      : syuname;
  created_at      : timestampl;
  last_changed_by : syuname;
  last_changed_at : timestampl;
}

@AbapCatalog.sqlViewName: 'ZVI_TRAVEL'
@AbapCatalog.compiler.compareFilter: true
@AbapCatalog.preserveKey: true
@AccessControl.authorizationCheck: #CHECK
@EndUserText.label: 'Travel data - XXX'
define root view ZI_TRAVEL_JERRY
 as select from ztravel_jerry as Travel
 /* Associations */
 association [0..1] to /DMO/I_Agency   as _Agency   on $projection.agency_id = _Agency.AgencyID
 association [0..1] to /DMO/I_Customer as _Customer on $projection.customer_id = _Customer.CustomerID
 association [0..1] to I_Currency      as _Currency on $projection.currency_code = _Currency.Currency
 {
  key travel_id,
     agency_id,
     customer_id,
     begin_date,
     end_date,
     @Semantics.amount.currencyCode: 'currency_code'
     booking_fee,
     @Semantics.amount.currencyCode: 'currency_code'
     total_price,
     @Semantics.currencyCode: true
     currency_code,
     description,
/*-- Admin data --*/
     @Semantics.user.createdBy: true
     created_by,
     @Semantics.systemDateTime.createdAt: true
     created_at,
     @Semantics.user.lastChangedBy: true
     last_changed_by,
     @Semantics.systemDateTime.lastChangedAt: true
     last_changed_at,
     /* Public associations */
     _Agency,
     _Customer,
     _Currency
}        

@EndUserText.label: 'Travel projection view - Processor'
@AccessControl.authorizationCheck: #NOT_REQUIRED
@UI: {
 headerInfo: { typeName: 'Travel', typeNamePlural: 'Travels', title: { type: #STANDARD, value: 'TravelID' } } }
@Search.searchable: true
define root view entity ZC_TRAVEL_JERRY as projection on ZI_TRAVEL_JERRY {
 @UI.facet: [ { id:              'Travel',
                purpose:         #STANDARD,
                type:            #IDENTIFICATION_REFERENCE,
                label:           'Travel',
                position:        10 } ]
 @UI: {
     lineItem:       [ { position: 10, importance: #HIGH } ],
     identification: [ { position: 10, label: 'Travel ID [1,...,99999999]' } ] }
 @Search.defaultSearchElement: true
 key travel_id          as TravelID,
 @UI: {
     lineItem:       [ { position: 20, importance: #HIGH } ],
     identification: [ { position: 20 } ],
     selectionField: [ { position: 20 } ] }
 @Consumption.valueHelpDefinition: [{ entity : {name: '/DMO/I_Agency', element: 'AgencyID'  } }]
 @ObjectModel.text.element: ['AgencyName'] ----meaning?
 @Search.defaultSearchElement: true
 agency_id          as AgencyID, _Agency.Name       as AgencyName,
 @UI: {
     lineItem:       [ { position: 30, importance: #HIGH } ],
     identification: [ { position: 30 } ],
     selectionField: [ { position: 30 } ] }
 @Consumption.valueHelpDefinition: [{ entity : {name: '/DMO/I_Customer', element: 'CustomerID'  } }]
 @ObjectModel.text.element: ['CustomerName']
 @Search.defaultSearchElement: true
 customer_id        as CustomerID,
 @UI.hidden: true
 _Customer.LastName as CustomerName,
 @UI: {
     lineItem:       [ { position: 40, importance: #MEDIUM } ],
     identification: [ { position: 40 } ] }
 begin_date         as BeginDate,
 @UI: {
     lineItem:       [ { position: 41, importance: #MEDIUM } ],
     identification: [ { position: 41 } ] }
 end_date           as EndDate,
 @UI: {
     lineItem:       [ { position: 50, importance: #MEDIUM } ],
     identification: [ { position: 50, label: 'Total Price' } ] }
 @Semantics.amount.currencyCode: 'CurrencyCode'
 total_price        as TotalPrice,
 @Consumption.valueHelpDefinition: [{entity: {name: 'I_Currency', element: 'Currency' }}]
 currency_code      as CurrencyCode,
 @UI.identification: [ { position: 60, label: 'Remarks' } ]
 description as Description,
 @UI.hidden: true
 last_changed_at    as LastChangedAt
 }    

@EndUserText.label: 'Service Defintion for ZC_Travel_JERRY'
define service ZUI_C_TRAVEL_JERRY {
  expose ZC_TRAVEL_JERRY as TravelProcessor;
  expose /DMO/I_Customer as Passenger;
  expose /DMO/I_Agency as TravelAgency;
  expose /DMO/I_Airport as Airport;
  expose I_Currency as Currency;
  expose I_Country as Country;
}