ABAP Select data from SAP table DEMO_CDS_DATFNC into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP DEMO_CDS_DATFNC 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_DATFNC. 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_DATFNC 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_DATFNC TYPE STANDARD TABLE OF DEMO_CDS_DATFNC,
      WA_DEMO_CDS_DATFNC TYPE DEMO_CDS_DATFNC,
      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_DATFNC> TYPE DEMO_CDS_DATFNC.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DEMO_CDS_DATFNC
*  INTO TABLE @DATA(IT_DEMO_CDS_DATFNC2).
*--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_DATFNC INDEX 1 INTO DATA(WA_DEMO_CDS_DATFNC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DEMO_CDS_DATFNC>-MANDT = 1.
<DEMO_CDS_DATFNC>-ID = 1.
<DEMO_CDS_DATFNC>-DATE1 = 1.
<DEMO_CDS_DATFNC>-VALID1 = 1.
<DEMO_CDS_DATFNC>-DATE2 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DEMO_CDS_DATFNC-VALID2, sy-vline,
  WA_DEMO_CDS_DATFNC-DIFFERENCE, sy-vline,
  WA_DEMO_CDS_DATFNC-DAY1, sy-vline,
  WA_DEMO_CDS_DATFNC-DAY2, sy-vline,
  WA_DEMO_CDS_DATFNC-DATE3, sy-vline,
  WA_DEMO_CDS_DATFNC-DATE4, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DEMO_CDS_DATFNC 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_DATFNC 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_DATFNC INTO WA_DEMO_CDS_DATFNC.


*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_DATFNC_STR, 
MANDT TYPE STRING,
ID TYPE STRING,
DATE1 TYPE STRING,
VALID1 TYPE STRING,
DATE2 TYPE STRING,
VALID2 TYPE STRING,
DIFFERENCE TYPE STRING,
DAY1 TYPE STRING,
DAY2 TYPE STRING,
DATE3 TYPE STRING,
DATE4 TYPE STRING,
DAYS_BETWEEN TYPE STRING,
ADD_DAYS TYPE STRING,
ADD_MONTH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DEMO_CDS_DATFNC_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_DATFNC_STR-MANDT sy-vline 
WA_DEMO_CDS_DATFNC_STR-ID sy-vline 
WA_DEMO_CDS_DATFNC_STR-DATE1 sy-vline 
WA_DEMO_CDS_DATFNC_STR-VALID1 sy-vline 
WA_DEMO_CDS_DATFNC_STR-DATE2 sy-vline 
WA_DEMO_CDS_DATFNC_STR-VALID2 sy-vline 
WA_DEMO_CDS_DATFNC_STR-DIFFERENCE sy-vline 
WA_DEMO_CDS_DATFNC_STR-DAY1 sy-vline 
WA_DEMO_CDS_DATFNC_STR-DAY2 sy-vline 
WA_DEMO_CDS_DATFNC_STR-DATE3 sy-vline 
WA_DEMO_CDS_DATFNC_STR-DATE4 sy-vline 
WA_DEMO_CDS_DATFNC_STR-DAYS_BETWEEN sy-vline 
WA_DEMO_CDS_DATFNC_STR-ADD_DAYS sy-vline 
WA_DEMO_CDS_DATFNC_STR-ADD_MONTH sy-vline      INTO ld_text SEPARATED BY SPACE.

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