ABAP Select data from SAP table MCCOMPB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCCOMPB
*  INTO TABLE @DATA(IT_MCCOMPB2).
*--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_MCCOMPB INDEX 1 INTO DATA(WA_MCCOMPB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCCOMPB>-SUPKZ = 1.
<MCCOMPB>-AUFNR = 1.
<MCCOMPB>-RSNUM = 1.
<MCCOMPB>-RSPOS = 1.
<MCCOMPB>-WERKS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCCOMPB-MATNR, sy-vline,
  WA_MCCOMPB-LGORT, sy-vline,
  WA_MCCOMPB-CHARG, sy-vline,
  WA_MCCOMPB-BDMNG, sy-vline,
  WA_MCCOMPB-ENMNG, sy-vline,
  WA_MCCOMPB-ENWRT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCCOMPB 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_MCCOMPB 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_MCCOMPB INTO WA_MCCOMPB.


*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 AUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCCOMPB-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCCOMPB-AUFNR.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field KDAUF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCCOMPB-KDAUF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCCOMPB-KDAUF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field IDNRK
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MCCOMPB-IDNRK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCCOMPB-IDNRK.
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_MCCOMPB_STR, 
SUPKZ TYPE STRING,
AUFNR TYPE STRING,
RSNUM TYPE STRING,
RSPOS TYPE STRING,
WERKS TYPE STRING,
MATNR TYPE STRING,
LGORT TYPE STRING,
CHARG TYPE STRING,
BDMNG TYPE STRING,
ENMNG TYPE STRING,
ENWRT TYPE STRING,
MEINS TYPE STRING,
WAERS TYPE STRING,
SOBKZ TYPE STRING,
SHKZG TYPE STRING,
KDAUF TYPE STRING,
KDPOS TYPE STRING,
KDEIN TYPE STRING,
BWART TYPE STRING,
GSBER TYPE STRING,
UMWRK TYPE STRING,
UMLGO TYPE STRING,
AMGLG TYPE STRING,
ZMNG TYPE STRING,
MATEFF TYPE STRING,
BUDAT TYPE STRING,
ARBID TYPE STRING,
IDNRK TYPE STRING,
A TYPE STRING,
DUMMY TYPE STRING,
MB_GRUND TYPE STRING,
ZEITP TYPE STRING,
NO_DISP TYPE STRING,
XWAOK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCCOMPB_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_MCCOMPB_STR-SUPKZ sy-vline 
WA_MCCOMPB_STR-AUFNR sy-vline 
WA_MCCOMPB_STR-RSNUM sy-vline 
WA_MCCOMPB_STR-RSPOS sy-vline 
WA_MCCOMPB_STR-WERKS sy-vline 
WA_MCCOMPB_STR-MATNR sy-vline 
WA_MCCOMPB_STR-LGORT sy-vline 
WA_MCCOMPB_STR-CHARG sy-vline 
WA_MCCOMPB_STR-BDMNG sy-vline 
WA_MCCOMPB_STR-ENMNG sy-vline 
WA_MCCOMPB_STR-ENWRT sy-vline 
WA_MCCOMPB_STR-MEINS sy-vline 
WA_MCCOMPB_STR-WAERS sy-vline 
WA_MCCOMPB_STR-SOBKZ sy-vline 
WA_MCCOMPB_STR-SHKZG sy-vline 
WA_MCCOMPB_STR-KDAUF sy-vline 
WA_MCCOMPB_STR-KDPOS sy-vline 
WA_MCCOMPB_STR-KDEIN sy-vline 
WA_MCCOMPB_STR-BWART sy-vline 
WA_MCCOMPB_STR-GSBER sy-vline 
WA_MCCOMPB_STR-UMWRK sy-vline 
WA_MCCOMPB_STR-UMLGO sy-vline 
WA_MCCOMPB_STR-AMGLG sy-vline 
WA_MCCOMPB_STR-ZMNG sy-vline 
WA_MCCOMPB_STR-MATEFF sy-vline 
WA_MCCOMPB_STR-BUDAT sy-vline 
WA_MCCOMPB_STR-ARBID sy-vline 
WA_MCCOMPB_STR-IDNRK sy-vline 
WA_MCCOMPB_STR-A sy-vline 
WA_MCCOMPB_STR-DUMMY sy-vline 
WA_MCCOMPB_STR-MB_GRUND sy-vline 
WA_MCCOMPB_STR-ZEITP sy-vline 
WA_MCCOMPB_STR-NO_DISP sy-vline 
WA_MCCOMPB_STR-XWAOK sy-vline      INTO ld_text SEPARATED BY SPACE.

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