ABAP Select data from SAP table MCHB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCHB
*  INTO TABLE @DATA(IT_MCHB2).
*--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_MCHB INDEX 1 INTO DATA(WA_MCHB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCHB>-MANDT = 1.
<MCHB>-MATNR = 1.
<MCHB>-WERKS = 1.
<MCHB>-LGORT = 1.
<MCHB>-CHARG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCHB-LVORM, sy-vline,
  WA_MCHB-ERSDA, sy-vline,
  WA_MCHB-ERNAM, sy-vline,
  WA_MCHB-LAEDA, sy-vline,
  WA_MCHB-AENAM, sy-vline,
  WA_MCHB-LFGJA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCHB 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_MCHB 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_MCHB INTO WA_MCHB.


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

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

*Conversion exit GJAHR, internal->external for field CHJIN
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MCHB-CHJIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCHB-CHJIN.
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_MCHB_STR, 
MANDT TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
CHARG TYPE STRING,
LVORM TYPE STRING,
ERSDA TYPE STRING,
ERNAM TYPE STRING,
LAEDA TYPE STRING,
AENAM TYPE STRING,
LFGJA TYPE STRING,
LFMON TYPE STRING,
SPERC TYPE STRING,
CLABS TYPE STRING,
CUMLM TYPE STRING,
CINSM TYPE STRING,
CEINM TYPE STRING,
CSPEM TYPE STRING,
CRETM TYPE STRING,
CVMLA TYPE STRING,
CVMUM TYPE STRING,
CVMIN TYPE STRING,
CVMEI TYPE STRING,
CVMSP TYPE STRING,
CVMRE TYPE STRING,
KZICL TYPE STRING,
KZICQ TYPE STRING,
KZICE TYPE STRING,
KZICS TYPE STRING,
KZVCL TYPE STRING,
KZVCQ TYPE STRING,
KZVCE TYPE STRING,
KZVCS TYPE STRING,
HERKL TYPE STRING,
CHDLL TYPE STRING,
CHJIN TYPE STRING,
CHRUE TYPE STRING,
SGT_SCAT TYPE STRING,
FSH_SEASON_YEAR TYPE STRING,
FSH_SEASON TYPE STRING,
FSH_COLLECTION TYPE STRING,
FSH_THEME TYPE STRING,
FSH_SALLOC_QTY TYPE STRING,
/CWM/CLABS TYPE STRING,
/CWM/CINSM TYPE STRING,
/CWM/CEINM TYPE STRING,
/CWM/CSPEM TYPE STRING,
/CWM/CRETM TYPE STRING,
/CWM/CUMLM TYPE STRING,
/CWM/CVMLA TYPE STRING,
/CWM/CVMIN TYPE STRING,
/CWM/CVMEI TYPE STRING,
/CWM/CVMSP TYPE STRING,
/CWM/CVMRE TYPE STRING,
/CWM/CVMUM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCHB_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_MCHB_STR-MANDT sy-vline 
WA_MCHB_STR-MATNR sy-vline 
WA_MCHB_STR-WERKS sy-vline 
WA_MCHB_STR-LGORT sy-vline 
WA_MCHB_STR-CHARG sy-vline 
WA_MCHB_STR-LVORM sy-vline 
WA_MCHB_STR-ERSDA sy-vline 
WA_MCHB_STR-ERNAM sy-vline 
WA_MCHB_STR-LAEDA sy-vline 
WA_MCHB_STR-AENAM sy-vline 
WA_MCHB_STR-LFGJA sy-vline 
WA_MCHB_STR-LFMON sy-vline 
WA_MCHB_STR-SPERC sy-vline 
WA_MCHB_STR-CLABS sy-vline 
WA_MCHB_STR-CUMLM sy-vline 
WA_MCHB_STR-CINSM sy-vline 
WA_MCHB_STR-CEINM sy-vline 
WA_MCHB_STR-CSPEM sy-vline 
WA_MCHB_STR-CRETM sy-vline 
WA_MCHB_STR-CVMLA sy-vline 
WA_MCHB_STR-CVMUM sy-vline 
WA_MCHB_STR-CVMIN sy-vline 
WA_MCHB_STR-CVMEI sy-vline 
WA_MCHB_STR-CVMSP sy-vline 
WA_MCHB_STR-CVMRE sy-vline 
WA_MCHB_STR-KZICL sy-vline 
WA_MCHB_STR-KZICQ sy-vline 
WA_MCHB_STR-KZICE sy-vline 
WA_MCHB_STR-KZICS sy-vline 
WA_MCHB_STR-KZVCL sy-vline 
WA_MCHB_STR-KZVCQ sy-vline 
WA_MCHB_STR-KZVCE sy-vline 
WA_MCHB_STR-KZVCS sy-vline 
WA_MCHB_STR-HERKL sy-vline 
WA_MCHB_STR-CHDLL sy-vline 
WA_MCHB_STR-CHJIN sy-vline 
WA_MCHB_STR-CHRUE sy-vline 
WA_MCHB_STR-SGT_SCAT sy-vline 
WA_MCHB_STR-FSH_SEASON_YEAR sy-vline 
WA_MCHB_STR-FSH_SEASON sy-vline 
WA_MCHB_STR-FSH_COLLECTION sy-vline 
WA_MCHB_STR-FSH_THEME sy-vline 
WA_MCHB_STR-FSH_SALLOC_QTY sy-vline 
WA_MCHB_STR-/CWM/CLABS sy-vline 
WA_MCHB_STR-/CWM/CINSM sy-vline 
WA_MCHB_STR-/CWM/CEINM sy-vline 
WA_MCHB_STR-/CWM/CSPEM sy-vline 
WA_MCHB_STR-/CWM/CRETM sy-vline 
WA_MCHB_STR-/CWM/CUMLM sy-vline 
WA_MCHB_STR-/CWM/CVMLA sy-vline 
WA_MCHB_STR-/CWM/CVMIN sy-vline 
WA_MCHB_STR-/CWM/CVMEI sy-vline 
WA_MCHB_STR-/CWM/CVMSP sy-vline 
WA_MCHB_STR-/CWM/CVMRE sy-vline 
WA_MCHB_STR-/CWM/CVMUM sy-vline      INTO ld_text SEPARATED BY SPACE.

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