ABAP Select data from SAP table LIST_MK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LIST_MK
*  INTO TABLE @DATA(IT_LIST_MK2).
*--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_LIST_MK INDEX 1 INTO DATA(WA_LIST_MK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LIST_MK>-FCTR_ID = 1.
<LIST_MK>-TEXT = 1.
<LIST_MK>-PS_POSID = 1.
<LIST_MK>-DEVCLASS = 1.
<LIST_MK>-FSTUSER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LIST_MK-FSTDATE, sy-vline,
  WA_LIST_MK-LSTUSER, sy-vline,
  WA_LIST_MK-LSTDATE, sy-vline,
  WA_LIST_MK-RELE, sy-vline,
  WA_LIST_MK-LSTRELE, sy-vline,
  WA_LIST_MK-ARIID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LIST_MK 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_LIST_MK 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_LIST_MK INTO WA_LIST_MK.


*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 RELE, internal->external for field RELE
CALL FUNCTION 'CONVERSION_EXIT_RELE_OUTPUT'
  EXPORTING
    input =                      WA_LIST_MK-RELE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LIST_MK-RELE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit RELE, internal->external for field LSTRELE
CALL FUNCTION 'CONVERSION_EXIT_RELE_OUTPUT'
  EXPORTING
    input =                      WA_LIST_MK-LSTRELE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LIST_MK-LSTRELE.
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_LIST_MK_STR, 
FCTR_ID TYPE STRING,
TEXT TYPE STRING,
PS_POSID TYPE STRING,
DEVCLASS TYPE STRING,
FSTUSER TYPE STRING,
FSTDATE TYPE STRING,
LSTUSER TYPE STRING,
LSTDATE TYPE STRING,
RELE TYPE STRING,
LSTRELE TYPE STRING,
ARIID TYPE STRING,
CUSTASS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LIST_MK_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_LIST_MK_STR-FCTR_ID sy-vline 
WA_LIST_MK_STR-TEXT sy-vline 
WA_LIST_MK_STR-PS_POSID sy-vline 
WA_LIST_MK_STR-DEVCLASS sy-vline 
WA_LIST_MK_STR-FSTUSER sy-vline 
WA_LIST_MK_STR-FSTDATE sy-vline 
WA_LIST_MK_STR-LSTUSER sy-vline 
WA_LIST_MK_STR-LSTDATE sy-vline 
WA_LIST_MK_STR-RELE sy-vline 
WA_LIST_MK_STR-LSTRELE sy-vline 
WA_LIST_MK_STR-ARIID sy-vline 
WA_LIST_MK_STR-CUSTASS sy-vline      INTO ld_text SEPARATED BY SPACE.

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