◾CDS view entities vs DDIC-based CDS views Part 4 ABAP on HANA Course



@AbapCatalog.viewEnhancementCategory: [#NONE]
@AccessControl.authorizationCheck: #CHECK
@EndUserText.label: 'Define view entity'
@Metadata.ignorePropagatedAnnotations: true
@ObjectModel.usageType:{
    serviceQuality: #X,
    sizeCategory: #S,
    dataClass: #MIXED
}
define view entity ZDDLS_SAMPLE_02
  //with parameters
  //                @Environment.systemField: #SYSTEM_DATE
  //                 p_date : abap.dats
  as select from vbak as head
  association [1..*] to vbap as _item on head.vbeln = _item.vbeln
{
  key head.vbeln as so,
      head.vkorg as sales__org,
      head.vkgrp,
      head.vbtyp as doc_type,
      head.erdat,
      head.bstnk,
      @Semantics.amount.currencyCode: 'waerk'
      head.netwr,
      head.waerk,
      _item,
      //      head.ernam,
      //        item.posnr,
      //        item.matnr,
      @EndUserText.label: 'Numerical'
      0.23       as num_lit,      
      'cds'      as char_lit
      //        $parameters.p_date as syst_date
}
//where
//  head.ernam = 'GABAP3'
//operator  = <> > < <= >= ?=
//[not] between a and b
// like % _
//not null not initial
//user condition  => show session variable we can't use right side
//Create define poicy define aspectfor 09 and use to filter 02
//True /flase
//hodt expression parameter session usee literal









//• Default value can be assigned with annotation – @Environment.systemField: #SYSTEM_DATE
//Parameters are optional only when default value is assigned. We can only use system fields such as #SYSTEM_DATE. Possible values are as below.
//DEMO_CDS_SYSTEM_FIELDS_VE











//define view entity ZDDLS_SAMPLE_02
//  with parameters
//    p_vben : vbeln,
//    @Environment.systemField: #SYSTEM_DATE
//    p_date : abap.dats
//  as select from vbak as head
//    inner join   vbap as item on head.vbeln = item.vbeln
//{
//  key head.vbeln as so,
//      head.vkorg as sales__org,
//      head.vkgrp,
//      item.posnr,
//      item.matnr,
//      0.23       as num_lit,
//      'cds'      as char_lit,
//      head.erdat
//}
//where
//      head.vbeln = $parameters.p_vben
//  and head.erdat = $parameters.p_date



/*
A:
 The CDS view entity can be used for high volume transactions or for background transactions.
  -> Maximum No of DDIC database tables 3,
  -> must not call any functions,
  -> must not aggregate a large number of table rows for direct access,
  -> must not access DDIC database tables with mixed data categories.
  -> If the underlying tables are buffered, the CDS view entity should be buffered too.
  -> The runtime for reading a single line with a fully specified key must be less than 1 ms
     for selecting fields from a field list or 2 ms for selecting all fields with
#B:
 The CDS view entity can be used for transactions or for background transactions.
  -> Maximum No of DDIC database tables 5,
  -> must not call any functions,
  -> must not aggregate a large number of table rows for direct access,
  -> must not access DDIC database tables with mixed data categories.
  -> If the underlying tables are buffered, the CDS view entity should be buffered too.
  -> The runtime for reading a single line with a fully specified key must be less than 2 ms
     for selecting fields from a field list or 5 ms for selecting all fields with

#C:
 The CDS view entity can be used to query individual objects in transactions.
  -> Maximum No of DDIC database tables 15,
  -> must not aggregate a large number of table rows for direct access,
  -> must not access DDIC database tables with mixed data categories.
  -> If the underlying tables are buffered, the CDS view entity should be buffered too.
  -> The runtime for reading a single line with a fully specified key must be less than 10 ms
     for selecting fields from a field list or 20 ms for selecting all fields with


#D:
 The CDS view entity can be used for analytical queries.
 -> Maximum No of DDIC database tables 100,
 -> The performance should be checked and monitored with realistic data by a test framework.

#X:
 The CDS view entity is designed for special application cases, such as data migration.
 -> Maximum No of DDIC database tables more than 100,
#P:
 The CDS view entity is used to structure hierarchies of CDS entities and must not be used outside of such a hierarchy.
 -> A CDS view entity with the quality category P is not intended for usage in business applications.
 -> Performance checks by a test framework are not required.

 */

Comments

Post a Comment

Popular posts from this blog

AMDP ( ABAP Managed Database Procedure ) Part - 1

Image
CLASS zcl_amdp_class DEFINITION PUBLIC FINAL CREATE PUBLIC . PUBLIC SECTION. INTERFACES if_amdp_marker_hdb . TYPES: BEGIN OF ty_cust , cust_name TYPE kna1 - name1 , netwr TYPE vbak - netwr , END OF ty_cust , tt_cust TYPE TABLE OF ty_cust . TYPES: BEGIN OF session_variables , client TYPE sy - mandt , cds_client TYPE sy - mandt , uname TYPE sy - uname , langu TYPE sy - langu , datum TYPE sy - datum , END OF session_variables . CLASS-METHODS get_session_variables_amdp AMDP OPTIONS READ-ONLY CDS SESSION CLIENT iv_clnt IMPORTING VALUE( iv_clnt ) TYPE sy - mandt EXPORTING VALUE( clnt ) TYPE session_variables - client VALUE( cds_clnt ) TYPE session_variables - cds_client VALUE( unam ) TYPE session_variables - uname VALUE( lang ) TYPE session_variables - langu ...
Read more

Backup all ADT Objects & Other queries RAP Part 10.1

CLASS zcl_DATA_GENERATOR DEFINITION PUBLIC FINAL CREATE PUBLIC . PUBLIC SECTION. INTERFACES: if_oo_adt_classrun . PROTECTED SECTION. PRIVATE SECTION. ENDCLASS . CLASS zcl_DATA_GENERATOR IMPLEMENTATION. METHOD if_oo_adt_classrun ~ main . " delete existing entries in the database table DELETE FROM ztravel_tech_m . DELETE FROM zBOOKING_tech_m . DELETE FROM zbooksupp_tech_m . COMMIT WORK. " insert travel demo data INSERT ztravel_tech_m FROM ( SELECT * FROM /dmo/travel_m ). COMMIT WORK. " insert booking demo data INSERT zbooking_tech_m FROM ( SELECT * FROM /dmo/booking_m * JOIN ztravel_tech_m AS z * ON booking~travel_id = z~travel_id ). COMMIT WORK. INSERT zbooksupp_tech_m FROM ( SELECT * FROM /dmo/booksuppl_m * JOIN ztravel_tech_m AS z * ON booking~travel_id = z~travel_id ). ...
Read more

SAP CDS Introduction Part 2 - ABAP on HANA Course

Image
Code :- @AbapCatalog.sqlViewName: 'ZVSQL_SAMPLE_01' @EndUserText.label: 'This is my fist DDIC based CDS' @AbapCatalog.preserveKey: true @AbapCatalog: {     buffering: {         status:#SWITCHED_OFF,         type: #NONE,         numberOfKeyFields: 000     },     viewEnhancementCategory: [#PROJECTION_LIST,#UNION],     compiler: {         compareFilter: true     },     dataMaintenance: #RESTRICTED } @AccessControl.authorizationCheck: #CHECK @ClientHandling: {     type: #INHERITED,     algorithm:#SESSION_VARIABLE } define view zcds_sample_01 --( SO, Kunnr, curr,netwr,clnt,sydate,syslang)   as select from vbak   association [1..*] to vbap as _item on vbak.vbeln = _item.vbeln {   key   vbeln                    as so,         kunnr  ...
Read more