ABAP Select data from SAP table /KYK/ISS_ME4N_N into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /KYK/ISS_ME4N_N 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 /KYK/ISS_ME4N_N. 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 /KYK/ISS_ME4N_N 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_/KYK/ISS_ME4N_N TYPE STANDARD TABLE OF /KYK/ISS_ME4N_N,
      WA_/KYK/ISS_ME4N_N TYPE /KYK/ISS_ME4N_N,
      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: </KYK/ISS_ME4N_N> TYPE /KYK/ISS_ME4N_N.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/KYK/ISS_ME4N_N.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /KYK/ISS_ME4N_N
  INTO TABLE IT_/KYK/ISS_ME4N_N.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /KYK/ISS_ME4N_N
*  INTO TABLE @DATA(IT_/KYK/ISS_ME4N_N2).
*--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_/KYK/ISS_ME4N_N INDEX 1 INTO DATA(WA_/KYK/ISS_ME4N_N2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/KYK/ISS_ME4N_N ASSIGNING </KYK/ISS_ME4N_N>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</KYK/ISS_ME4N_N>-EBELN = 1.
</KYK/ISS_ME4N_N>-EBELP = 1.
</KYK/ISS_ME4N_N>-SUPERFIELD = 1.
</KYK/ISS_ME4N_N>-EKORG = 1.
</KYK/ISS_ME4N_N>-EKGRP = 1.

ENDLOOP.

LOOP AT IT_/KYK/ISS_ME4N_N INTO WA_/KYK/ISS_ME4N_N.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/KYK/ISS_ME4N_N-BEDAT, sy-vline,
  WA_/KYK/ISS_ME4N_N-EMATN, sy-vline,
  WA_/KYK/ISS_ME4N_N-TXZ01, sy-vline,
  WA_/KYK/ISS_ME4N_N-WERKS, sy-vline,
  WA_/KYK/ISS_ME4N_N-MENGE, sy-vline,
  WA_/KYK/ISS_ME4N_N-MEINS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/KYK/ISS_ME4N_N 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_/KYK/ISS_ME4N_N 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_/KYK/ISS_ME4N_N INTO WA_/KYK/ISS_ME4N_N.


*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_/KYK/ISS_ME4N_N-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/KYK/ISS_ME4N_N-EBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field EMATN
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_/KYK/ISS_ME4N_N-EMATN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/KYK/ISS_ME4N_N-EMATN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/KYK/ISS_ME4N_N-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/KYK/ISS_ME4N_N-MEINS.
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_/KYK/ISS_ME4N_N_STR, 
EBELN TYPE STRING,
EBELP TYPE STRING,
SUPERFIELD TYPE STRING,
EKORG TYPE STRING,
EKGRP TYPE STRING,
BEDAT TYPE STRING,
EMATN TYPE STRING,
TXZ01 TYPE STRING,
WERKS TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
NETPR TYPE STRING,
WAERS TYPE STRING,
PEINH TYPE STRING,
AGDAT TYPE STRING,
SUBMI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/KYK/ISS_ME4N_N_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_/KYK/ISS_ME4N_N_STR-EBELN sy-vline 
WA_/KYK/ISS_ME4N_N_STR-EBELP sy-vline 
WA_/KYK/ISS_ME4N_N_STR-SUPERFIELD sy-vline 
WA_/KYK/ISS_ME4N_N_STR-EKORG sy-vline 
WA_/KYK/ISS_ME4N_N_STR-EKGRP sy-vline 
WA_/KYK/ISS_ME4N_N_STR-BEDAT sy-vline 
WA_/KYK/ISS_ME4N_N_STR-EMATN sy-vline 
WA_/KYK/ISS_ME4N_N_STR-TXZ01 sy-vline 
WA_/KYK/ISS_ME4N_N_STR-WERKS sy-vline 
WA_/KYK/ISS_ME4N_N_STR-MENGE sy-vline 
WA_/KYK/ISS_ME4N_N_STR-MEINS sy-vline 
WA_/KYK/ISS_ME4N_N_STR-NETPR sy-vline 
WA_/KYK/ISS_ME4N_N_STR-WAERS sy-vline 
WA_/KYK/ISS_ME4N_N_STR-PEINH sy-vline 
WA_/KYK/ISS_ME4N_N_STR-AGDAT sy-vline 
WA_/KYK/ISS_ME4N_N_STR-SUBMI sy-vline      INTO ld_text SEPARATED BY SPACE.

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