ABAP Select data from SAP table MCWMIKZ into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MCWMIKZ 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 MCWMIKZ. 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 MCWMIKZ 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_MCWMIKZ TYPE STANDARD TABLE OF MCWMIKZ,
      WA_MCWMIKZ TYPE MCWMIKZ,
      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: <MCWMIKZ> TYPE MCWMIKZ.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCWMIKZ
*  INTO TABLE @DATA(IT_MCWMIKZ2).
*--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_MCWMIKZ INDEX 1 INTO DATA(WA_MCWMIKZ2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCWMIKZ>-LGTYP = 1.
<MCWMIKZ>-LGBER = 1.
<MCWMIKZ>-LGPLA = 1.
<MCWMIKZ>-LPTYP = 1.
<MCWMIKZ>-ALTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCWMIKZ-ALBER, sy-vline,
  WA_MCWMIKZ-ALPLA, sy-vline,
  WA_MCWMIKZ-ELTYP, sy-vline,
  WA_MCWMIKZ-ELBER, sy-vline,
  WA_MCWMIKZ-ELPLA, sy-vline,
  WA_MCWMIKZ-TAEPC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCWMIKZ 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_MCWMIKZ 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_MCWMIKZ INTO WA_MCWMIKZ.


*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 CUNIT, internal->external for field LZEIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MCWMIKZ-LZEIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCWMIKZ-LZEIT.
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_MCWMIKZ_STR, 
LGTYP TYPE STRING,
LGBER TYPE STRING,
LGPLA TYPE STRING,
LPTYP TYPE STRING,
ALTYP TYPE STRING,
ALBER TYPE STRING,
ALPLA TYPE STRING,
ELTYP TYPE STRING,
ELBER TYPE STRING,
ELPLA TYPE STRING,
TAEPC TYPE STRING,
TAEGW TYPE STRING,
TAEMG TYPE STRING,
TARPC TYPE STRING,
TARGW TYPE STRING,
TARMG TYPE STRING,
RGLAC TYPE STRING,
TAAPC TYPE STRING,
TAAGW TYPE STRING,
TAAMG TYPE STRING,
EXEMG TYPE STRING,
EXEPC TYPE STRING,
EXEGW TYPE STRING,
EXAMG TYPE STRING,
EXAPC TYPE STRING,
EXAGW TYPE STRING,
AEPSC TYPE STRING,
AEMNG TYPE STRING,
AEGEW TYPE STRING,
TBBZC TYPE STRING,
RFBZC TYPE STRING,
UMBZC TYPE STRING,
LFBZC TYPE STRING,
RSBZC TYPE STRING,
BE_AE TYPE STRING,
BEAEC TYPE STRING,
BP_AE TYPE STRING,
BPAEC TYPE STRING,
AE_AQ TYPE STRING,
AEAQC TYPE STRING,
LK_AE TYPE STRING,
LKAEC TYPE STRING,
EDPSC TYPE STRING,
EDMNG TYPE STRING,
VDPSC TYPE STRING,
VDMNG TYPE STRING,
NKPSC TYPE STRING,
LZEIT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCWMIKZ_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_MCWMIKZ_STR-LGTYP sy-vline 
WA_MCWMIKZ_STR-LGBER sy-vline 
WA_MCWMIKZ_STR-LGPLA sy-vline 
WA_MCWMIKZ_STR-LPTYP sy-vline 
WA_MCWMIKZ_STR-ALTYP sy-vline 
WA_MCWMIKZ_STR-ALBER sy-vline 
WA_MCWMIKZ_STR-ALPLA sy-vline 
WA_MCWMIKZ_STR-ELTYP sy-vline 
WA_MCWMIKZ_STR-ELBER sy-vline 
WA_MCWMIKZ_STR-ELPLA sy-vline 
WA_MCWMIKZ_STR-TAEPC sy-vline 
WA_MCWMIKZ_STR-TAEGW sy-vline 
WA_MCWMIKZ_STR-TAEMG sy-vline 
WA_MCWMIKZ_STR-TARPC sy-vline 
WA_MCWMIKZ_STR-TARGW sy-vline 
WA_MCWMIKZ_STR-TARMG sy-vline 
WA_MCWMIKZ_STR-RGLAC sy-vline 
WA_MCWMIKZ_STR-TAAPC sy-vline 
WA_MCWMIKZ_STR-TAAGW sy-vline 
WA_MCWMIKZ_STR-TAAMG sy-vline 
WA_MCWMIKZ_STR-EXEMG sy-vline 
WA_MCWMIKZ_STR-EXEPC sy-vline 
WA_MCWMIKZ_STR-EXEGW sy-vline 
WA_MCWMIKZ_STR-EXAMG sy-vline 
WA_MCWMIKZ_STR-EXAPC sy-vline 
WA_MCWMIKZ_STR-EXAGW sy-vline 
WA_MCWMIKZ_STR-AEPSC sy-vline 
WA_MCWMIKZ_STR-AEMNG sy-vline 
WA_MCWMIKZ_STR-AEGEW sy-vline 
WA_MCWMIKZ_STR-TBBZC sy-vline 
WA_MCWMIKZ_STR-RFBZC sy-vline 
WA_MCWMIKZ_STR-UMBZC sy-vline 
WA_MCWMIKZ_STR-LFBZC sy-vline 
WA_MCWMIKZ_STR-RSBZC sy-vline 
WA_MCWMIKZ_STR-BE_AE sy-vline 
WA_MCWMIKZ_STR-BEAEC sy-vline 
WA_MCWMIKZ_STR-BP_AE sy-vline 
WA_MCWMIKZ_STR-BPAEC sy-vline 
WA_MCWMIKZ_STR-AE_AQ sy-vline 
WA_MCWMIKZ_STR-AEAQC sy-vline 
WA_MCWMIKZ_STR-LK_AE sy-vline 
WA_MCWMIKZ_STR-LKAEC sy-vline 
WA_MCWMIKZ_STR-EDPSC sy-vline 
WA_MCWMIKZ_STR-EDMNG sy-vline 
WA_MCWMIKZ_STR-VDPSC sy-vline 
WA_MCWMIKZ_STR-VDMNG sy-vline 
WA_MCWMIKZ_STR-NKPSC sy-vline 
WA_MCWMIKZ_STR-LZEIT sy-vline      INTO ld_text SEPARATED BY SPACE.

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