ABAP Select data from SAP table MC29M into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MC29M 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 MC29M. 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 MC29M 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_MC29M TYPE STANDARD TABLE OF MC29M,
      WA_MC29M TYPE MC29M,
      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: <MC29M> TYPE MC29M.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MC29M.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MC29M
  INTO TABLE IT_MC29M.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MC29M
*  INTO TABLE @DATA(IT_MC29M2).
*--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_MC29M INDEX 1 INTO DATA(WA_MC29M2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MC29M ASSIGNING <MC29M>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MC29M>-AENAM = 1.
<MC29M>-AESZN = 1.
<MC29M>-BLANZ = 1.
<MC29M>-BLATT = 1.
<MC29M>-BRGEW = 1.

ENDLOOP.

LOOP AT IT_MC29M INTO WA_MC29M.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MC29M-DISST, sy-vline,
  WA_MC29M-ERNAM, sy-vline,
  WA_MC29M-ERSDA, sy-vline,
  WA_MC29M-FERTH, sy-vline,
  WA_MC29M-GEWEI, sy-vline,
  WA_MC29M-GROES, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MC29M 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_MC29M 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_MC29M INTO WA_MC29M.


*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 GEWEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MC29M-GEWEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC29M-GEWEI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MC29M-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC29M-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MC29M-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC29M-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VOLEH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MC29M-VOLEH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC29M-VOLEH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field STDPD
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MC29M-STDPD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC29M-STDPD.
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_MC29M_STR, 
AENAM TYPE STRING,
AESZN TYPE STRING,
BLANZ TYPE STRING,
BLATT TYPE STRING,
BRGEW TYPE STRING,
DISST TYPE STRING,
ERNAM TYPE STRING,
ERSDA TYPE STRING,
FERTH TYPE STRING,
GEWEI TYPE STRING,
GROES TYPE STRING,
LABOR TYPE STRING,
LAEDA TYPE STRING,
LOEVM TYPE STRING,
MAKTX TYPE STRING,
MATNR TYPE STRING,
MBRSH TYPE STRING,
MEINS TYPE STRING,
MTART TYPE STRING,
NORMT TYPE STRING,
NTGEW TYPE STRING,
VOLEH TYPE STRING,
VOLUM TYPE STRING,
VPSTA TYPE STRING,
MATKL TYPE STRING,
WRKST TYPE STRING,
ZEIFO TYPE STRING,
ZEINR TYPE STRING,
ZEIVR TYPE STRING,
ZEIAR TYPE STRING,
KZDKZ TYPE STRING,
KZREV TYPE STRING,
KZKFG TYPE STRING,
STDPD TYPE STRING,
CUOBJ TYPE STRING,
KZWSM TYPE STRING,
ATTYP TYPE STRING,
MSTAE TYPE STRING,
DSTLK TYPE STRING,
DSTLP TYPE STRING,
KZEFF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MC29M_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_MC29M_STR-AENAM sy-vline 
WA_MC29M_STR-AESZN sy-vline 
WA_MC29M_STR-BLANZ sy-vline 
WA_MC29M_STR-BLATT sy-vline 
WA_MC29M_STR-BRGEW sy-vline 
WA_MC29M_STR-DISST sy-vline 
WA_MC29M_STR-ERNAM sy-vline 
WA_MC29M_STR-ERSDA sy-vline 
WA_MC29M_STR-FERTH sy-vline 
WA_MC29M_STR-GEWEI sy-vline 
WA_MC29M_STR-GROES sy-vline 
WA_MC29M_STR-LABOR sy-vline 
WA_MC29M_STR-LAEDA sy-vline 
WA_MC29M_STR-LOEVM sy-vline 
WA_MC29M_STR-MAKTX sy-vline 
WA_MC29M_STR-MATNR sy-vline 
WA_MC29M_STR-MBRSH sy-vline 
WA_MC29M_STR-MEINS sy-vline 
WA_MC29M_STR-MTART sy-vline 
WA_MC29M_STR-NORMT sy-vline 
WA_MC29M_STR-NTGEW sy-vline 
WA_MC29M_STR-VOLEH sy-vline 
WA_MC29M_STR-VOLUM sy-vline 
WA_MC29M_STR-VPSTA sy-vline 
WA_MC29M_STR-MATKL sy-vline 
WA_MC29M_STR-WRKST sy-vline 
WA_MC29M_STR-ZEIFO sy-vline 
WA_MC29M_STR-ZEINR sy-vline 
WA_MC29M_STR-ZEIVR sy-vline 
WA_MC29M_STR-ZEIAR sy-vline 
WA_MC29M_STR-KZDKZ sy-vline 
WA_MC29M_STR-KZREV sy-vline 
WA_MC29M_STR-KZKFG sy-vline 
WA_MC29M_STR-STDPD sy-vline 
WA_MC29M_STR-CUOBJ sy-vline 
WA_MC29M_STR-KZWSM sy-vline 
WA_MC29M_STR-ATTYP sy-vline 
WA_MC29M_STR-MSTAE sy-vline 
WA_MC29M_STR-DSTLK sy-vline 
WA_MC29M_STR-DSTLP sy-vline 
WA_MC29M_STR-KZEFF sy-vline      INTO ld_text SEPARATED BY SPACE.

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