ABAP Select data from SAP table MACKU into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MACKU
*  INTO TABLE @DATA(IT_MACKU2).
*--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_MACKU INDEX 1 INTO DATA(WA_MACKU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MACKU>-MANDT = 1.
<MACKU>-MATNR = 1.
<MACKU>-BWKEY = 1.
<MACKU>-BWTAR = 1.
<MACKU>-MTART = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MACKU-MATKL, sy-vline,
  WA_MACKU-KZKFG, sy-vline,
  WA_MACKU-VPRSV, sy-vline,
  WA_MACKU-VERPR, sy-vline,
  WA_MACKU-STPRS, sy-vline,
  WA_MACKU-PEINH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MACKU 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_MACKU 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_MACKU INTO WA_MACKU.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MACKU-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MACKU-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field /CWM/VALUM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MACKU-/CWM/VALUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MACKU-/CWM/VALUM.
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_MACKU_STR, 
MANDT TYPE STRING,
MATNR TYPE STRING,
BWKEY TYPE STRING,
BWTAR TYPE STRING,
MTART TYPE STRING,
MATKL TYPE STRING,
KZKFG TYPE STRING,
VPRSV TYPE STRING,
VERPR TYPE STRING,
STPRS TYPE STRING,
PEINH TYPE STRING,
BKLAS TYPE STRING,
BWTTY TYPE STRING,
ZKPRS TYPE STRING,
ZKDAT TYPE STRING,
BWPRS TYPE STRING,
BWPRH TYPE STRING,
BWPS1 TYPE STRING,
BWPH1 TYPE STRING,
VJBWS TYPE STRING,
VJBWH TYPE STRING,
ZPLP1 TYPE STRING,
ZPLP2 TYPE STRING,
ZPLP3 TYPE STRING,
ZPLD1 TYPE STRING,
ZPLD2 TYPE STRING,
ZPLD3 TYPE STRING,
KALNR TYPE STRING,
KALN1 TYPE STRING,
VMSTP TYPE STRING,
VMPEI TYPE STRING,
HRKFT TYPE STRING,
EKALR TYPE STRING,
ZPLPR TYPE STRING,
HKMAT TYPE STRING,
BWPEI TYPE STRING,
/CWM/XCWMAT TYPE STRING,
/CWM/VALUM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MACKU_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_MACKU_STR-MANDT sy-vline 
WA_MACKU_STR-MATNR sy-vline 
WA_MACKU_STR-BWKEY sy-vline 
WA_MACKU_STR-BWTAR sy-vline 
WA_MACKU_STR-MTART sy-vline 
WA_MACKU_STR-MATKL sy-vline 
WA_MACKU_STR-KZKFG sy-vline 
WA_MACKU_STR-VPRSV sy-vline 
WA_MACKU_STR-VERPR sy-vline 
WA_MACKU_STR-STPRS sy-vline 
WA_MACKU_STR-PEINH sy-vline 
WA_MACKU_STR-BKLAS sy-vline 
WA_MACKU_STR-BWTTY sy-vline 
WA_MACKU_STR-ZKPRS sy-vline 
WA_MACKU_STR-ZKDAT sy-vline 
WA_MACKU_STR-BWPRS sy-vline 
WA_MACKU_STR-BWPRH sy-vline 
WA_MACKU_STR-BWPS1 sy-vline 
WA_MACKU_STR-BWPH1 sy-vline 
WA_MACKU_STR-VJBWS sy-vline 
WA_MACKU_STR-VJBWH sy-vline 
WA_MACKU_STR-ZPLP1 sy-vline 
WA_MACKU_STR-ZPLP2 sy-vline 
WA_MACKU_STR-ZPLP3 sy-vline 
WA_MACKU_STR-ZPLD1 sy-vline 
WA_MACKU_STR-ZPLD2 sy-vline 
WA_MACKU_STR-ZPLD3 sy-vline 
WA_MACKU_STR-KALNR sy-vline 
WA_MACKU_STR-KALN1 sy-vline 
WA_MACKU_STR-VMSTP sy-vline 
WA_MACKU_STR-VMPEI sy-vline 
WA_MACKU_STR-HRKFT sy-vline 
WA_MACKU_STR-EKALR sy-vline 
WA_MACKU_STR-ZPLPR sy-vline 
WA_MACKU_STR-HKMAT sy-vline 
WA_MACKU_STR-BWPEI sy-vline 
WA_MACKU_STR-/CWM/XCWMAT sy-vline 
WA_MACKU_STR-/CWM/VALUM sy-vline      INTO ld_text SEPARATED BY SPACE.

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