ABAP Select data from SAP table WB2_EKPA into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WB2_EKPA 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 WB2_EKPA. 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 WB2_EKPA 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_WB2_EKPA TYPE STANDARD TABLE OF WB2_EKPA,
      WA_WB2_EKPA TYPE WB2_EKPA,
      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: <WB2_EKPA> TYPE WB2_EKPA.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_WB2_EKPA.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM WB2_EKPA
  INTO TABLE IT_WB2_EKPA.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WB2_EKPA
*  INTO TABLE @DATA(IT_WB2_EKPA2).
*--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_WB2_EKPA INDEX 1 INTO DATA(WA_WB2_EKPA2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_WB2_EKPA ASSIGNING <WB2_EKPA>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WB2_EKPA>-MANDT = 1.
<WB2_EKPA>-EBELN = 1.
<WB2_EKPA>-EBELP = 1.
<WB2_EKPA>-EKORG = 1.
<WB2_EKPA>-LTSNR = 1.

ENDLOOP.

LOOP AT IT_WB2_EKPA INTO WA_WB2_EKPA.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WB2_EKPA-WERKS, sy-vline,
  WA_WB2_EKPA-PARVW, sy-vline,
  WA_WB2_EKPA-PARZA, sy-vline,
  WA_WB2_EKPA-ERNAM, sy-vline,
  WA_WB2_EKPA-ERDAT, sy-vline,
  WA_WB2_EKPA-LIFN2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WB2_EKPA 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_WB2_EKPA 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_WB2_EKPA INTO WA_WB2_EKPA.


*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_WB2_EKPA-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WB2_EKPA-EBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field PARVW
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_WB2_EKPA-PARVW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WB2_EKPA-PARVW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFN2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WB2_EKPA-LIFN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WB2_EKPA-LIFN2.
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_WB2_EKPA_STR, 
MANDT TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
EKORG TYPE STRING,
LTSNR TYPE STRING,
WERKS TYPE STRING,
PARVW TYPE STRING,
PARZA TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
LIFN2 TYPE STRING,
DEFPA TYPE STRING,
HITYP TYPE STRING,
PARNR TYPE STRING,
PERNR TYPE STRING,
PRFRE TYPE STRING,
BOLRE TYPE STRING,
HISTUNR TYPE STRING,
_DATAAGING TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WB2_EKPA_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_WB2_EKPA_STR-MANDT sy-vline 
WA_WB2_EKPA_STR-EBELN sy-vline 
WA_WB2_EKPA_STR-EBELP sy-vline 
WA_WB2_EKPA_STR-EKORG sy-vline 
WA_WB2_EKPA_STR-LTSNR sy-vline 
WA_WB2_EKPA_STR-WERKS sy-vline 
WA_WB2_EKPA_STR-PARVW sy-vline 
WA_WB2_EKPA_STR-PARZA sy-vline 
WA_WB2_EKPA_STR-ERNAM sy-vline 
WA_WB2_EKPA_STR-ERDAT sy-vline 
WA_WB2_EKPA_STR-LIFN2 sy-vline 
WA_WB2_EKPA_STR-DEFPA sy-vline 
WA_WB2_EKPA_STR-HITYP sy-vline 
WA_WB2_EKPA_STR-PARNR sy-vline 
WA_WB2_EKPA_STR-PERNR sy-vline 
WA_WB2_EKPA_STR-PRFRE sy-vline 
WA_WB2_EKPA_STR-BOLRE sy-vline 
WA_WB2_EKPA_STR-HISTUNR sy-vline 
WA_WB2_EKPA_STR-_DATAAGING sy-vline      INTO ld_text SEPARATED BY SPACE.

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