You will learn how to use the Core Data Services (CDS) tools in ABAP in Eclipse.
You will learn
In the following exercise you will learn how to use the new Core Data Services (CDS) tools in ABAP in Eclipse. CDS is an extension of the ABAP Dictionary that allows you to define semantically rich data models in the database and to use these data models in your ABAP programs. CDS is a central part of enabling Code Push-down in ABAP applications. You will learn to define a new CDS view in a DDL source. You will also learn about some of the CDS enhanced view-building capabilities such as associations and annotations. You can find more information about CDS in the SAP Help Portal (coming soon) and the SAP Community Network (coming soon).
Step 1: Choosing ABAP Object
In the context menu of your package choose New and then choose Other ABAP Repository Object.
The new view appears in an editor. In this editor, enter the following values: • enter ZINVOICEITEMS as the SQL view name. • enter the CDS view sepm_sddl_so_invoice_item as the data source for your view. Use code completion (keyboard shortcut CTRL+SPACE) to get proposals for the data source.
Note: The SQL view name is the internal/technical name of the view which will be created in the database. Z_Invoice_Items is the name of the CDS view which provides enhanced view-building capabilities in ABAP. You should always use the CDS view name in your ABAP applications. [DONE]
Step 7: Editing the SELECT statement
You will now insert the fields currency_code and gross_amount into the SELECT list as follows: • Trigger code completion in the SELECT list (by clicking on the SELECT list and using keyboard shortcut CTRL+SPACE), then double click on the entry Insert all elements - template. All the elements (fields and associations) of the underlying data source are inserted into the SELECT list. • Remove all the elements in the SELECT list which were inserted by the code completion apart from currency_code and gross_amount. Remember to separate the elements in the SELECT statement with a comma.
You will now use some CDS associations. CDS associations model the relationships between data sources. You can use associations in path expressions to access elements (fields and associations) in related data sources without specifying JOIN conditions. You can now display the element info by positioning the cursor on the data source name sepm_sddl_so_invoice_item and choosing F2. • To see the related data sources that can be accessed using associations, scroll down. • To see details about the target data source of the association header, choose the hyperlink sepm_sddl_so_invoice_header
You will now add fields of related data sources to the SELECT list of Z_Invoice_Items, using the associations in path expressions. Each element in the path expression must be separated by a period. • Add the company_name of the business partner to the SELECT list using the associations header and buyer in a path expression • Add the payment_status from the invoice header to the SELECT list using the association header