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What a CDS-view can do for you | sitNL 2016

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Ben Meijs / CTAC

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What a CDS-view can do for you | sitNL 2016

  1. 1. © Ctac - Better Business. Ctac Cloud SITNL 2016 What a CDS-view can do for You Practical use of CDS Views on ECC EHP7 on HANA - tricks & tips Ben Meijs
  2. 2. © Ctac - Better Business. Ctac Cloud 2 ABOUT ME
  3. 3. © Ctac - Better Business. Ctac Cloud 3 CDS Quick RECAP Use Case – BW Extract Unit Conversions Date defaults/ functions Use Case – Report Texts in one go Tips Outlook
  4. 4. © Ctac - Better Business. Ctac Cloud 4 What is a CDS?
  5. 5. © Ctac - Better Business. Ctac Cloud 6 Core Data Services – it’s an ABAPPER thing! • Just like defining an Database View in SE11, but with a lot more options: • INNER and OUTER JOINS • ASSOCIATIONS • UNION • Built-in functions • Parameters • Annotations => DB-viewname, client dependency, buffering. generating Odata-services and BOPF-artifacts • How do you define a CDS View? • In ECLIPSE! • Using a Data Definition Language • Generates a Database View • You use a CDS-view • With Open SQL • In other CDS-view
  6. 6. © Ctac - Better Business. Ctac Cloud 7 Creating a CDS with a JOIN - example
  7. 7. © Ctac - Better Business. Ctac Cloud 8 CDS – options and Built-in functions
  8. 8. © Ctac - Better Business. Ctac Cloud 9 CDS – options and Built-in functions
  9. 9. © Ctac - Better Business. Ctac Cloud 10 Creating a CDS with a JOIN - example
  10. 10. © Ctac - Better Business. Ctac Cloud 11 CDS Quick RECAP Use Case – BW Extract Unit Conversions Date defaults/ functions Use Case – Report Texts in one go Tips Outlook
  11. 11. © Ctac - Better Business. Ctac Cloud 12 Use Case – CDS view for BW extractor without using any ABAP Question: is it possible to define a fast BW extractor in an ECC-on-HANA environment, without any ABAP-statement? • Selection of sales orders, purchase orders, inbound and outbound deliveries within a timeframe of next 6 weeks; • Quantities in base unit of measure (MARA-MEINS); • Aggregate this data on Material Number, Plant, Week number; • Make it as fast as possible; Technical Challenges: • Material Unit conversion (every quantity in base unit of measure MARA-MEINS); • No system variables in CDS on WAS740; • No calculations possible with date fields in CDS-context on WAS740; Answer: Yes, it is possible. A weekly run including all the necessary steps on BW now only takes a few minutes
  12. 12. © Ctac - Better Business. Ctac Cloud 13 CDS Quick RECAP Use Case – BW Extract Unit Conversions Date defaults/ functions Use Case – Report Texts in one go Tips Outlook
  13. 13. © Ctac - Better Business. Ctac Cloud 14 Trick 1 - Unit Conversion using CDS Option 1 – Use the ABAP function for material unit conversions Option 2 – Let BW do the unit conversions Option 3 – Include Material Conversion Table MARM in the CDS
  14. 14. © Ctac - Better Business. Ctac Cloud 15 CDS Quick RECAP Use Case – BW Extract Unit Conversions Date defaults/ functions Use Case – Report Texts in one go Tips Outlook
  15. 15. © Ctac - Better Business. Ctac Cloud 16 Trick 2 – Default Date and Date +/+ 42 days Option 1 – Use of two view parameters for these two dates Option 2 – Use HANA: M_TIME_DIMENSION via an External view
  16. 16. © Ctac - Better Business. Ctac Cloud 17 Trick 3 – Get week number for date Option 1 – Use of ABAP calendar function to calculate week numbers Option 2 – Use HANA: M_TIME_DIMENSION via an External view
  17. 17. © Ctac - Better Business. Ctac Cloud 18 Snapshot of resulting CDS Main CDS (extraction) CDS – Open Deliveries SUM group by MATNR/WERKS/WEEKNR CDS – Open Deliveries Details from VBBE CDS – Time (Weeknumbers) Weeknumber, based on VBBE-MBDAT Stock Shipments Open Orders
  18. 18. © Ctac - Better Business. Ctac Cloud 19 CDS Quick RECAP Use Case – BW Extract Unit Conversions Date defaults/ functions Use Case – Report Texts in one go Tips Outlook
  19. 19. © Ctac - Better Business. Ctac Cloud 20 Use Case – Just a simple ABAP Report Question: Is it possible to read the first line of a ‘SAPscript’ text using a CDS-view? • Selection of Sales order data with partners and status information • The user wants the first line of a specific Sales order text in the output Technical Challenges: • How to get the first line of the text • How to read a field of type LRAW (STXL-CLUSTD) • Vague error messages Solution • Extra CDS-views needed in order to be able to read the first line of a text • All primary key fields of all JOINED tables must be specified in the field list. Otherwise a DB-view is generated with all fields as key field. LRAW-fields cannot be key fields! • The text can be converted in the ABAP ALV report using a specific IMPORT statement that converts from RAW to Text format. Answer: Yes, if the implicit View key is generated correctly.
  20. 20. © Ctac - Better Business. Ctac Cloud 21 CDS-view with first line of long text
  21. 21. © Ctac - Better Business. Ctac Cloud 22 ABAP - Converting the LRAW text to readable format
  22. 22. © Ctac - Better Business. Ctac Cloud 23 CDS Quick RECAP Use Case – BW Extract Unit Conversions Date defaults/ functions Use Case – Report Texts in one go Tips Outlook
  23. 23. © Ctac - Better Business. Ctac Cloud 24 Tips How and when to use CDS-views: • CDS offers options to limit number of needed ABAP-statements (Code Pushdown) • Limit use of WHERE-clause in CDS-views (reusability!); • CDS has more options than Open SQL • Important role of CDS in SAP Architecture Be careful and precise when using JOINS: • Are you sure that you should use an INNER JOIN? • Are you sure that you should use an OUTER JOIN? • Did you specify all relevant JOIN fields in the ON-clause? • Don’t forget the DISTINCT option of the SELECT-statement Technical tips: • CDS not limited to HANA • If not all key fields of joined tables are specified in field list, all fields are considered key field in the generated VIEW • External Views: synchronize and re-activate usage
  24. 24. © Ctac - Better Business. Ctac Cloud 25 CDS Quick RECAP Use Case – BW Extract Unit Conversions Date defaults/ functions Use Case – Report Texts in one go Tips Outlook
  25. 25. © Ctac - Better Business. Ctac Cloud 26 Outlook – CDS as common data model in S/4HANA
  26. 26. © Ctac - Better Business. Ctac Cloud 27 Outlook – CDS as central model in future developments
  27. 27. © Ctac - Better Business. Ctac Cloud 28
  28. 28. © Ctac - Better Business. Ctac Cloud 29 Outlook – CDS as central model in future developments
  29. 29. © Ctac - Better Business. Ctac Cloud 30 © Ctac - Better Business. Ctac Cloud Thank you

Editor's Notes

  • CDS in ABAP context van een 740 system on HANA.
    Use Cases om gebruik te schetsen. We gaan het verder niet hebben over hoe dat wordt ingericht
    Deze presentatie gaat niet over waarom je CDS zou moeten gebruiken ipv Open SQL of SQL Script
  • CDS is not restricted to HANA
  • CDS in ABAP context van een 740 system on HANA.
    Use Cases om gebruik te schetsen. We gaan het verder niet hebben over hoe dat wordt ingericht
    Deze presentatie gaat niet over waarom je CDS zou moeten gebruiken ipv Open SQL of SQL Script
  • CDS in ABAP context van een 740 system on HANA.
    Use Cases om gebruik te schetsen. We gaan het verder niet hebben over hoe dat wordt ingericht
    Deze presentatie gaat niet over waarom je CDS zou moeten gebruiken ipv Open SQL of SQL Script
  • Use function DIVISION
    DEMO DDL : Z_SITNL_MATERIAL_UNIT_CONV, Z_SITNL_EXAMPLE_MATCONV
    View: ZV_SITNL_UOM
  • CDS in ABAP context van een 740 system on HANA.
    Use Cases om gebruik te schetsen. We gaan het verder niet hebben over hoe dat wordt ingericht
    Deze presentatie gaat niet over waarom je CDS zou moeten gebruiken ipv Open SQL of SQL Script
  • Rekenen met datumvelden kan niet in CDS.
    In 750 zijn er datumfuncties,
    View ZV_SITNL_CURDAT
    DDL Z_Sitnl_Example_Dateselection

    Demo geven van external view! ZVE_DATE_TO
  • View ZVE_TIME -> F8 en SE16N demo
  • CDS in ABAP context van een 740 system on HANA.
    Use Cases om gebruik te schetsen. We gaan het verder niet hebben over hoe dat wordt ingericht
    Deze presentatie gaat niet over waarom je CDS zou moeten gebruiken ipv Open SQL of SQL Script
  • Voorbeeld CDS views
  • Voorbeeldprogramma zsitnl_cds_lraw
  • CDS in ABAP context van een 740 system on HANA.
    Use Cases om gebruik te schetsen. We gaan het verder niet hebben over hoe dat wordt ingericht
    Deze presentatie gaat niet over waarom je CDS zou moeten gebruiken ipv Open SQL of SQL Script
  • CDS in ABAP context van een 740 system on HANA.
    Use Cases om gebruik te schetsen. We gaan het verder niet hebben over hoe dat wordt ingericht
    Deze presentatie gaat niet over waarom je CDS zou moeten gebruiken ipv Open SQL of SQL Script
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