ABAP Select data from SAP table MACK2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MACK2 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 MACK2. 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 MACK2 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_MACK2 TYPE STANDARD TABLE OF MACK2,
      WA_MACK2 TYPE MACK2,
      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: <MACK2> TYPE MACK2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MACK2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MACK2
  INTO TABLE IT_MACK2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MACK2
*  INTO TABLE @DATA(IT_MACK22).
*--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_MACK2 INDEX 1 INTO DATA(WA_MACK22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MACK2 ASSIGNING <MACK2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MACK2>-MANDT = 1.
<MACK2>-MATNR = 1.
<MACK2>-BWKEY = 1.
<MACK2>-BWTAR = 1.
<MACK2>-VPRSV = 1.

ENDLOOP.

LOOP AT IT_MACK2 INTO WA_MACK2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MACK2-VERPR, sy-vline,
  WA_MACK2-STPRS, sy-vline,
  WA_MACK2-PEINH, sy-vline,
  WA_MACK2-BKLAS, sy-vline,
  WA_MACK2-BWTTY, sy-vline,
  WA_MACK2-ZKPRS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MACK2 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_MACK2 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_MACK2 INTO WA_MACK2.


*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_MACK2-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MACK2-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field STDPD
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MACK2-STDPD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MACK2-STDPD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MACK2-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MACK2-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field LFGJA
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MACK2-LFGJA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MACK2-LFGJA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PRCTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MACK2-PRCTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MACK2-PRCTR.
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_MACK2_STR, 
MANDT TYPE STRING,
MATNR TYPE STRING,
BWKEY TYPE STRING,
BWTAR 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,
ZPLPR TYPE STRING,
FPLPX 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,
SOBSK TYPE STRING,
SOBSL TYPE STRING,
MTART TYPE STRING,
HRKFT TYPE STRING,
EKALR TYPE STRING,
STDPD TYPE STRING,
CUOBJ TYPE STRING,
KZKFG TYPE STRING,
SAUFT TYPE STRING,
SFEPR TYPE STRING,
HKMAT TYPE STRING,
USEQU TYPE STRING,
LPLPR TYPE STRING,
LPLPX TYPE STRING,
MEINS TYPE STRING,
LFGJA TYPE STRING,
LFMON TYPE STRING,
VMVPR TYPE STRING,
VMVER TYPE STRING,
VPLPR TYPE STRING,
VPLPX TYPE STRING,
SBDKZ TYPE STRING,
MLMAA TYPE STRING,
VJPEI TYPE STRING,
PRCTR TYPE STRING,
SPART TYPE STRING,
BWPEI TYPE STRING,
DISST TYPE STRING,
EKLAS TYPE STRING,
QKLAS TYPE STRING,
NCOST TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MACK2_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_MACK2_STR-MANDT sy-vline 
WA_MACK2_STR-MATNR sy-vline 
WA_MACK2_STR-BWKEY sy-vline 
WA_MACK2_STR-BWTAR sy-vline 
WA_MACK2_STR-VPRSV sy-vline 
WA_MACK2_STR-VERPR sy-vline 
WA_MACK2_STR-STPRS sy-vline 
WA_MACK2_STR-PEINH sy-vline 
WA_MACK2_STR-BKLAS sy-vline 
WA_MACK2_STR-BWTTY sy-vline 
WA_MACK2_STR-ZKPRS sy-vline 
WA_MACK2_STR-ZKDAT sy-vline 
WA_MACK2_STR-BWPRS sy-vline 
WA_MACK2_STR-BWPRH sy-vline 
WA_MACK2_STR-BWPS1 sy-vline 
WA_MACK2_STR-BWPH1 sy-vline 
WA_MACK2_STR-VJBWS sy-vline 
WA_MACK2_STR-VJBWH sy-vline 
WA_MACK2_STR-ZPLPR sy-vline 
WA_MACK2_STR-FPLPX sy-vline 
WA_MACK2_STR-ZPLP1 sy-vline 
WA_MACK2_STR-ZPLP2 sy-vline 
WA_MACK2_STR-ZPLP3 sy-vline 
WA_MACK2_STR-ZPLD1 sy-vline 
WA_MACK2_STR-ZPLD2 sy-vline 
WA_MACK2_STR-ZPLD3 sy-vline 
WA_MACK2_STR-KALNR sy-vline 
WA_MACK2_STR-KALN1 sy-vline 
WA_MACK2_STR-VMSTP sy-vline 
WA_MACK2_STR-VMPEI sy-vline 
WA_MACK2_STR-SOBSK sy-vline 
WA_MACK2_STR-SOBSL sy-vline 
WA_MACK2_STR-MTART sy-vline 
WA_MACK2_STR-HRKFT sy-vline 
WA_MACK2_STR-EKALR sy-vline 
WA_MACK2_STR-STDPD sy-vline 
WA_MACK2_STR-CUOBJ sy-vline 
WA_MACK2_STR-KZKFG sy-vline 
WA_MACK2_STR-SAUFT sy-vline 
WA_MACK2_STR-SFEPR sy-vline 
WA_MACK2_STR-HKMAT sy-vline 
WA_MACK2_STR-USEQU sy-vline 
WA_MACK2_STR-LPLPR sy-vline 
WA_MACK2_STR-LPLPX sy-vline 
WA_MACK2_STR-MEINS sy-vline 
WA_MACK2_STR-LFGJA sy-vline 
WA_MACK2_STR-LFMON sy-vline 
WA_MACK2_STR-VMVPR sy-vline 
WA_MACK2_STR-VMVER sy-vline 
WA_MACK2_STR-VPLPR sy-vline 
WA_MACK2_STR-VPLPX sy-vline 
WA_MACK2_STR-SBDKZ sy-vline 
WA_MACK2_STR-MLMAA sy-vline 
WA_MACK2_STR-VJPEI sy-vline 
WA_MACK2_STR-PRCTR sy-vline 
WA_MACK2_STR-SPART sy-vline 
WA_MACK2_STR-BWPEI sy-vline 
WA_MACK2_STR-DISST sy-vline 
WA_MACK2_STR-EKLAS sy-vline 
WA_MACK2_STR-QKLAS sy-vline 
WA_MACK2_STR-NCOST sy-vline      INTO ld_text SEPARATED BY SPACE.

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