ABAP Select data from SAP table E1S2KMPUS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP E1S2KMPUS 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 E1S2KMPUS. 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 E1S2KMPUS 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_E1S2KMPUS TYPE STANDARD TABLE OF E1S2KMPUS,
      WA_E1S2KMPUS TYPE E1S2KMPUS,
      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: <E1S2KMPUS> TYPE E1S2KMPUS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_E1S2KMPUS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM E1S2KMPUS
  INTO TABLE IT_E1S2KMPUS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM E1S2KMPUS
*  INTO TABLE @DATA(IT_E1S2KMPUS2).
*--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_E1S2KMPUS INDEX 1 INTO DATA(WA_E1S2KMPUS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_E1S2KMPUS ASSIGNING <E1S2KMPUS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<E1S2KMPUS>-SLK = 1.
<E1S2KMPUS>-PLC = 1.
<E1S2KMPUS>-PNR = 1.
<E1S2KMPUS>-MFU = 1.
<E1S2KMPUS>-NSN = 1.

ENDLOOP.

LOOP AT IT_E1S2KMPUS INTO WA_E1S2KMPUS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_E1S2KMPUS-UOI, sy-vline,
  WA_E1S2KMPUS-UOM, sy-vline,
  WA_E1S2KMPUS-QUI, sy-vline,
  WA_E1S2KMPUS-SIN, sy-vline,
  WA_E1S2KMPUS-POSEX, sy-vline,
  WA_E1S2KMPUS-MENEE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_E1S2KMPUS 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_E1S2KMPUS 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_E1S2KMPUS INTO WA_E1S2KMPUS.


*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_E1S2KMPUS_STR, 
SLK TYPE STRING,
PLC TYPE STRING,
PNR TYPE STRING,
MFU TYPE STRING,
NSN TYPE STRING,
UOI TYPE STRING,
UOM TYPE STRING,
QUI TYPE STRING,
SIN TYPE STRING,
POSEX TYPE STRING,
MENEE TYPE STRING,
PMENE TYPE STRING,
BMNG2 TYPE STRING,
MFRNR TYPE STRING,
MFRPN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_E1S2KMPUS_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_E1S2KMPUS_STR-SLK sy-vline 
WA_E1S2KMPUS_STR-PLC sy-vline 
WA_E1S2KMPUS_STR-PNR sy-vline 
WA_E1S2KMPUS_STR-MFU sy-vline 
WA_E1S2KMPUS_STR-NSN sy-vline 
WA_E1S2KMPUS_STR-UOI sy-vline 
WA_E1S2KMPUS_STR-UOM sy-vline 
WA_E1S2KMPUS_STR-QUI sy-vline 
WA_E1S2KMPUS_STR-SIN sy-vline 
WA_E1S2KMPUS_STR-POSEX sy-vline 
WA_E1S2KMPUS_STR-MENEE sy-vline 
WA_E1S2KMPUS_STR-PMENE sy-vline 
WA_E1S2KMPUS_STR-BMNG2 sy-vline 
WA_E1S2KMPUS_STR-MFRNR sy-vline 
WA_E1S2KMPUS_STR-MFRPN sy-vline      INTO ld_text SEPARATED BY SPACE.

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