ABAP Select data from SAP table EKAN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EKAN
*  INTO TABLE @DATA(IT_EKAN2).
*--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_EKAN INDEX 1 INTO DATA(WA_EKAN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EKAN>-MANDT = 1.
<EKAN>-EBELN = 1.
<EKAN>-NAME1 = 1.
<EKAN>-NAME2 = 1.
<EKAN>-NAME3 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EKAN-NAME4, sy-vline,
  WA_EKAN-PSTLZ, sy-vline,
  WA_EKAN-ORT01, sy-vline,
  WA_EKAN-LAND1, sy-vline,
  WA_EKAN-STRAS, sy-vline,
  WA_EKAN-PFACH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EKAN 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_EKAN 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_EKAN INTO WA_EKAN.


*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 EBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_EKAN-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EKAN-EBELN.
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_EKAN_STR, 
MANDT TYPE STRING,
EBELN TYPE STRING,
NAME1 TYPE STRING,
NAME2 TYPE STRING,
NAME3 TYPE STRING,
NAME4 TYPE STRING,
PSTLZ TYPE STRING,
ORT01 TYPE STRING,
LAND1 TYPE STRING,
STRAS TYPE STRING,
PFACH TYPE STRING,
PSTL2 TYPE STRING,
ANRED TYPE STRING,
TELX1 TYPE STRING,
TELFX TYPE STRING,
TELTX TYPE STRING,
DATLT TYPE STRING,
TELBX TYPE STRING,
REGIO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EKAN_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_EKAN_STR-MANDT sy-vline 
WA_EKAN_STR-EBELN sy-vline 
WA_EKAN_STR-NAME1 sy-vline 
WA_EKAN_STR-NAME2 sy-vline 
WA_EKAN_STR-NAME3 sy-vline 
WA_EKAN_STR-NAME4 sy-vline 
WA_EKAN_STR-PSTLZ sy-vline 
WA_EKAN_STR-ORT01 sy-vline 
WA_EKAN_STR-LAND1 sy-vline 
WA_EKAN_STR-STRAS sy-vline 
WA_EKAN_STR-PFACH sy-vline 
WA_EKAN_STR-PSTL2 sy-vline 
WA_EKAN_STR-ANRED sy-vline 
WA_EKAN_STR-TELX1 sy-vline 
WA_EKAN_STR-TELFX sy-vline 
WA_EKAN_STR-TELTX sy-vline 
WA_EKAN_STR-DATLT sy-vline 
WA_EKAN_STR-TELBX sy-vline 
WA_EKAN_STR-REGIO sy-vline      INTO ld_text SEPARATED BY SPACE.

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