ABAP Select data from SAP table DKAD2_EXT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DKAD2_EXT 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 DKAD2_EXT. 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 DKAD2_EXT 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_DKAD2_EXT TYPE STANDARD TABLE OF DKAD2_EXT,
      WA_DKAD2_EXT TYPE DKAD2_EXT,
      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: <DKAD2_EXT> TYPE DKAD2_EXT.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DKAD2_EXT.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DKAD2_EXT
  INTO TABLE IT_DKAD2_EXT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DKAD2_EXT
*  INTO TABLE @DATA(IT_DKAD2_EXT2).
*--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_DKAD2_EXT INDEX 1 INTO DATA(WA_DKAD2_EXT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DKAD2_EXT ASSIGNING <DKAD2_EXT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DKAD2_EXT>-ANRED = 1.
<DKAD2_EXT>-NAME1 = 1.
<DKAD2_EXT>-NAME2 = 1.
<DKAD2_EXT>-NAME3 = 1.
<DKAD2_EXT>-NAME4 = 1.

ENDLOOP.

LOOP AT IT_DKAD2_EXT INTO WA_DKAD2_EXT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DKAD2_EXT-STRAS, sy-vline,
  WA_DKAD2_EXT-PFACH, sy-vline,
  WA_DKAD2_EXT-PSTL2, sy-vline,
  WA_DKAD2_EXT-PFORT, sy-vline,
  WA_DKAD2_EXT-LAND1, sy-vline,
  WA_DKAD2_EXT-PSTLZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DKAD2_EXT 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_DKAD2_EXT 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_DKAD2_EXT INTO WA_DKAD2_EXT.


*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.

*Conversion exit ALPHA, internal->external for field KONTO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DKAD2_EXT-KONTO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DKAD2_EXT-KONTO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ADRNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DKAD2_EXT-ADRNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DKAD2_EXT-ADRNR.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

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

TYPES: BEGIN OF T_DKAD2_EXT_STR, 
ANRED TYPE STRING,
NAME1 TYPE STRING,
NAME2 TYPE STRING,
NAME3 TYPE STRING,
NAME4 TYPE STRING,
STRAS TYPE STRING,
PFACH TYPE STRING,
PSTL2 TYPE STRING,
PFORT TYPE STRING,
LAND1 TYPE STRING,
PSTLZ TYPE STRING,
ORT01 TYPE STRING,
ORT02 TYPE STRING,
REGIO TYPE STRING,
INLND TYPE STRING,
KONTO TYPE STRING,
EIKTO TYPE STRING,
ZSABE TYPE STRING,
SNAME TYPE STRING,
ADRNR TYPE STRING,
ADRSTR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DKAD2_EXT_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_DKAD2_EXT_STR-ANRED sy-vline 
WA_DKAD2_EXT_STR-NAME1 sy-vline 
WA_DKAD2_EXT_STR-NAME2 sy-vline 
WA_DKAD2_EXT_STR-NAME3 sy-vline 
WA_DKAD2_EXT_STR-NAME4 sy-vline 
WA_DKAD2_EXT_STR-STRAS sy-vline 
WA_DKAD2_EXT_STR-PFACH sy-vline 
WA_DKAD2_EXT_STR-PSTL2 sy-vline 
WA_DKAD2_EXT_STR-PFORT sy-vline 
WA_DKAD2_EXT_STR-LAND1 sy-vline 
WA_DKAD2_EXT_STR-PSTLZ sy-vline 
WA_DKAD2_EXT_STR-ORT01 sy-vline 
WA_DKAD2_EXT_STR-ORT02 sy-vline 
WA_DKAD2_EXT_STR-REGIO sy-vline 
WA_DKAD2_EXT_STR-INLND sy-vline 
WA_DKAD2_EXT_STR-KONTO sy-vline 
WA_DKAD2_EXT_STR-EIKTO sy-vline 
WA_DKAD2_EXT_STR-ZSABE sy-vline 
WA_DKAD2_EXT_STR-SNAME sy-vline 
WA_DKAD2_EXT_STR-ADRNR sy-vline 
WA_DKAD2_EXT_STR-ADRSTR sy-vline      INTO ld_text SEPARATED BY SPACE.

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