ABAP Select data from SAP table BAPI_ESKN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BAPI_ESKN
*  INTO TABLE @DATA(IT_BAPI_ESKN2).
*--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_BAPI_ESKN INDEX 1 INTO DATA(WA_BAPI_ESKN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BAPI_ESKN>-SATZART = 1.
<BAPI_ESKN>-MANDT = 1.
<BAPI_ESKN>-PACKNO = 1.
<BAPI_ESKN>-ZEKKN = 1.
<BAPI_ESKN>-WPROZ = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BAPI_ESKN-GSBER, sy-vline,
  WA_BAPI_ESKN-KOSTL, sy-vline,
  WA_BAPI_ESKN-ANLN1, sy-vline,
  WA_BAPI_ESKN-ANLN2, sy-vline,
  WA_BAPI_ESKN-AUFNR, sy-vline,
  WA_BAPI_ESKN-PS_PSP_PNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BAPI_ESKN 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_BAPI_ESKN 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_BAPI_ESKN INTO WA_BAPI_ESKN.


*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 KOSTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BAPI_ESKN-KOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BAPI_ESKN-KOSTL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ANLN1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BAPI_ESKN-ANLN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BAPI_ESKN-ANLN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ANLN2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BAPI_ESKN-ANLN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BAPI_ESKN-ANLN2.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field SAKTO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BAPI_ESKN-SAKTO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BAPI_ESKN-SAKTO.
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_BAPI_ESKN_STR, 
SATZART TYPE STRING,
MANDT TYPE STRING,
PACKNO TYPE STRING,
ZEKKN TYPE STRING,
WPROZ TYPE STRING,
GSBER TYPE STRING,
KOSTL TYPE STRING,
ANLN1 TYPE STRING,
ANLN2 TYPE STRING,
AUFNR TYPE STRING,
PS_PSP_PNR TYPE STRING,
VBELN TYPE STRING,
VBELP TYPE STRING,
SAKTO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BAPI_ESKN_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_BAPI_ESKN_STR-SATZART sy-vline 
WA_BAPI_ESKN_STR-MANDT sy-vline 
WA_BAPI_ESKN_STR-PACKNO sy-vline 
WA_BAPI_ESKN_STR-ZEKKN sy-vline 
WA_BAPI_ESKN_STR-WPROZ sy-vline 
WA_BAPI_ESKN_STR-GSBER sy-vline 
WA_BAPI_ESKN_STR-KOSTL sy-vline 
WA_BAPI_ESKN_STR-ANLN1 sy-vline 
WA_BAPI_ESKN_STR-ANLN2 sy-vline 
WA_BAPI_ESKN_STR-AUFNR sy-vline 
WA_BAPI_ESKN_STR-PS_PSP_PNR sy-vline 
WA_BAPI_ESKN_STR-VBELN sy-vline 
WA_BAPI_ESKN_STR-VBELP sy-vline 
WA_BAPI_ESKN_STR-SAKTO sy-vline      INTO ld_text SEPARATED BY SPACE.

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