一个使用CDS VIEW 的 DEMO

一个使用CDS VIEW 的demo

 1 REPORT demo_cds_currency_conversion.
 2
 3 CLASS demo DEFINITION.
 4   PUBLIC SECTION.
 5     CLASS-METHODS main.
 6   PRIVATE SECTION.
 7     CLASS-METHODS setup.
 8 ENDCLASS.
 9
10 CLASS demo IMPLEMENTATION.
11   METHOD main.
12     DATA(out) = cl_demo_output=>new( ).
13
14     DATA currency TYPE c LENGTH 5 VALUE ‘USD‘.
15     cl_demo_input=>request( CHANGING field = currency ).
16     currency = to_upper( currency ).
17     setup( ).
18
19     SELECT *
20            FROM demo_prices
21            ORDER BY id
22            INTO TABLE @DATA(original_prices).
23
24     out->begin_section( `Original Prices`
25       )->write( original_prices
26       )->next_section( `Converted Prices` ).
27
28     IF cl_abap_dbfeatures=>use_features(
29       EXPORTING
30         requested_features =
31           VALUE #( ( cl_abap_dbfeatures=>views_with_parameters ) ) ).
32       TRY.
33           SELECT *
34                  FROM demo_cds_currency_conversion(
35                         to_currency = @currency, exc_date = @sy-datlo )
36                  ORDER BY id
37                  INTO TABLE @DATA(converted_prices)
38                  ##db_feature_mode[views_with_parameters].
39           out->write( converted_prices ).
40         CATCH cx_sy_open_sql_db INTO DATA(exc).
41           out->write( exc->get_text( ) ).
42       ENDTRY.
43     ELSE.
44       out->write(
45             ‘Database system does not support views with parameters‘ ).
46     ENDIF.
47
48     out->display( ).
49   ENDMETHOD.
50   METHOD setup.
51     DATA prices TYPE SORTED TABLE OF demo_prices
52                 WITH UNIQUE KEY id.
53     prices = VALUE #(
54       ( id = 1 amount = ‘1.00‘ currency = ‘EUR‘ )
55       ( id = 2 amount = ‘1.00‘ currency = ‘GBP‘ )
56       ( id = 3 amount = ‘1.00‘ currency = ‘JPY‘ )
57       ( id = 4 amount = ‘1.00‘ currency = ‘USD‘ ) ).
58
59     DELETE FROM demo_prices.
60     INSERT demo_prices FROM TABLE prices.
61   ENDMETHOD.
62 ENDCLASS.
63
64 START-OF-SELECTION.
65   demo=>main( ).

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在抉择的哪一刻，成败实已露出端倪。