ABAP Select data from SAP table DEMO_CDS_SFLGHT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DEMO_CDS_SFLGHT table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to DEMO_CDS_SFLGHT. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the DEMO_CDS_SFLGHT table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_DEMO_CDS_SFLGHT TYPE STANDARD TABLE OF DEMO_CDS_SFLGHT,
      WA_DEMO_CDS_SFLGHT TYPE DEMO_CDS_SFLGHT,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <DEMO_CDS_SFLGHT> TYPE DEMO_CDS_SFLGHT.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DEMO_CDS_SFLGHT.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DEMO_CDS_SFLGHT
  INTO TABLE IT_DEMO_CDS_SFLGHT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DEMO_CDS_SFLGHT
*  INTO TABLE @DATA(IT_DEMO_CDS_SFLGHT2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_DEMO_CDS_SFLGHT INDEX 1 INTO DATA(WA_DEMO_CDS_SFLGHT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DEMO_CDS_SFLGHT ASSIGNING <DEMO_CDS_SFLGHT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DEMO_CDS_SFLGHT>-MANDT = 1.
<DEMO_CDS_SFLGHT>-CARRID = 1.
<DEMO_CDS_SFLGHT>-CONNID = 1.
<DEMO_CDS_SFLGHT>-FLDATE = 1.
<DEMO_CDS_SFLGHT>-PRICE = 1.

ENDLOOP.

LOOP AT IT_DEMO_CDS_SFLGHT INTO WA_DEMO_CDS_SFLGHT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DEMO_CDS_SFLGHT-CURRENCY, sy-vline,
  WA_DEMO_CDS_SFLGHT-PLANETYPE, sy-vline,
  WA_DEMO_CDS_SFLGHT-SEATSMAX, sy-vline,
  WA_DEMO_CDS_SFLGHT-SEATSOCC, sy-vline,
  WA_DEMO_CDS_SFLGHT-PAYMENTSUM, sy-vline,
  WA_DEMO_CDS_SFLGHT-SEATSMAX_B, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DEMO_CDS_SFLGHT you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_DEMO_CDS_SFLGHT TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_DEMO_CDS_SFLGHT INTO WA_DEMO_CDS_SFLGHT.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_DEMO_CDS_SFLGHT_STR, 
MANDT TYPE STRING,
CARRID TYPE STRING,
CONNID TYPE STRING,
FLDATE TYPE STRING,
PRICE TYPE STRING,
CURRENCY TYPE STRING,
PLANETYPE TYPE STRING,
SEATSMAX TYPE STRING,
SEATSOCC TYPE STRING,
PAYMENTSUM TYPE STRING,
SEATSMAX_B TYPE STRING,
SEATSOCC_B TYPE STRING,
SEATSMAX_F TYPE STRING,
SEATSOCC_F TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DEMO_CDS_SFLGHT_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_DEMO_CDS_SFLGHT_STR-MANDT sy-vline 
WA_DEMO_CDS_SFLGHT_STR-CARRID sy-vline 
WA_DEMO_CDS_SFLGHT_STR-CONNID sy-vline 
WA_DEMO_CDS_SFLGHT_STR-FLDATE sy-vline 
WA_DEMO_CDS_SFLGHT_STR-PRICE sy-vline 
WA_DEMO_CDS_SFLGHT_STR-CURRENCY sy-vline 
WA_DEMO_CDS_SFLGHT_STR-PLANETYPE sy-vline 
WA_DEMO_CDS_SFLGHT_STR-SEATSMAX sy-vline 
WA_DEMO_CDS_SFLGHT_STR-SEATSOCC sy-vline 
WA_DEMO_CDS_SFLGHT_STR-PAYMENTSUM sy-vline 
WA_DEMO_CDS_SFLGHT_STR-SEATSMAX_B sy-vline 
WA_DEMO_CDS_SFLGHT_STR-SEATSOCC_B sy-vline 
WA_DEMO_CDS_SFLGHT_STR-SEATSMAX_F sy-vline 
WA_DEMO_CDS_SFLGHT_STR-SEATSOCC_F sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.