ABAP Select data from SAP table SMCHB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SMCHB
*  INTO TABLE @DATA(IT_SMCHB2).
*--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_SMCHB INDEX 1 INTO DATA(WA_SMCHB2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SMCHB-XDBUP, sy-vline,
  WA_SMCHB-CLABS, sy-vline,
  WA_SMCHB-CUMLM, sy-vline,
  WA_SMCHB-CINSM, sy-vline,
  WA_SMCHB-CEINM, sy-vline,
  WA_SMCHB-CSPEM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SMCHB 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_SMCHB 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_SMCHB INTO WA_SMCHB.


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

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

*Conversion exit GJAHR, internal->external for field CHGJA
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_SMCHB-CHGJA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_SMCHB-CHGJA.
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_SMCHB_STR, 
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
CHARG TYPE STRING,
RMCHB TYPE STRING,
XDBUP 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,
CLABS_OLD TYPE STRING,
CUMLM_OLD TYPE STRING,
CINSM_OLD TYPE STRING,
CEINM_OLD TYPE STRING,
CSPEM_OLD TYPE STRING,
CRETM_OLD TYPE STRING,
CVMLA_OLD TYPE STRING,
CVMUM_OLD TYPE STRING,
CVMIN_OLD TYPE STRING,
CVMEI_OLD TYPE STRING,
CVMSP_OLD TYPE STRING,
CVMRE_OLD TYPE STRING,
LFGJA TYPE STRING,
LFMON TYPE STRING,
LVORM TYPE STRING,
RMCHBH TYPE STRING,
CHLFM TYPE STRING,
CHGJA TYPE STRING,
CHRUE TYPE STRING,
SGT_SCAT 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,
/CWM/CLABS_OLD TYPE STRING,
/CWM/CINSM_OLD TYPE STRING,
/CWM/CEINM_OLD TYPE STRING,
/CWM/CSPEM_OLD TYPE STRING,
/CWM/CRETM_OLD TYPE STRING,
/CWM/CUMLM_OLD TYPE STRING,
/CWM/CVMLA_OLD TYPE STRING,
/CWM/CVMIN_OLD TYPE STRING,
/CWM/CVMEI_OLD TYPE STRING,
/CWM/CVMSP_OLD TYPE STRING,
/CWM/CVMRE_OLD TYPE STRING,
/CWM/CVMUM_OLD TYPE STRING,
FSH_SEASON_YEAR TYPE STRING,
FSH_SEASON TYPE STRING,
FSH_COLLECTION TYPE STRING,
FSH_THEME TYPE STRING,
FSH_SALLOC_QTY TYPE STRING,
FSH_SALLOC_QTY_OLD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SMCHB_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_SMCHB_STR-MATNR sy-vline 
WA_SMCHB_STR-WERKS sy-vline 
WA_SMCHB_STR-LGORT sy-vline 
WA_SMCHB_STR-CHARG sy-vline 
WA_SMCHB_STR-RMCHB sy-vline 
WA_SMCHB_STR-XDBUP sy-vline 
WA_SMCHB_STR-CLABS sy-vline 
WA_SMCHB_STR-CUMLM sy-vline 
WA_SMCHB_STR-CINSM sy-vline 
WA_SMCHB_STR-CEINM sy-vline 
WA_SMCHB_STR-CSPEM sy-vline 
WA_SMCHB_STR-CRETM sy-vline 
WA_SMCHB_STR-CVMLA sy-vline 
WA_SMCHB_STR-CVMUM sy-vline 
WA_SMCHB_STR-CVMIN sy-vline 
WA_SMCHB_STR-CVMEI sy-vline 
WA_SMCHB_STR-CVMSP sy-vline 
WA_SMCHB_STR-CVMRE sy-vline 
WA_SMCHB_STR-CLABS_OLD sy-vline 
WA_SMCHB_STR-CUMLM_OLD sy-vline 
WA_SMCHB_STR-CINSM_OLD sy-vline 
WA_SMCHB_STR-CEINM_OLD sy-vline 
WA_SMCHB_STR-CSPEM_OLD sy-vline 
WA_SMCHB_STR-CRETM_OLD sy-vline 
WA_SMCHB_STR-CVMLA_OLD sy-vline 
WA_SMCHB_STR-CVMUM_OLD sy-vline 
WA_SMCHB_STR-CVMIN_OLD sy-vline 
WA_SMCHB_STR-CVMEI_OLD sy-vline 
WA_SMCHB_STR-CVMSP_OLD sy-vline 
WA_SMCHB_STR-CVMRE_OLD sy-vline 
WA_SMCHB_STR-LFGJA sy-vline 
WA_SMCHB_STR-LFMON sy-vline 
WA_SMCHB_STR-LVORM sy-vline 
WA_SMCHB_STR-RMCHBH sy-vline 
WA_SMCHB_STR-CHLFM sy-vline 
WA_SMCHB_STR-CHGJA sy-vline 
WA_SMCHB_STR-CHRUE sy-vline 
WA_SMCHB_STR-SGT_SCAT sy-vline 
WA_SMCHB_STR-/CWM/CLABS sy-vline 
WA_SMCHB_STR-/CWM/CINSM sy-vline 
WA_SMCHB_STR-/CWM/CEINM sy-vline 
WA_SMCHB_STR-/CWM/CSPEM sy-vline 
WA_SMCHB_STR-/CWM/CRETM sy-vline 
WA_SMCHB_STR-/CWM/CUMLM sy-vline 
WA_SMCHB_STR-/CWM/CVMLA sy-vline 
WA_SMCHB_STR-/CWM/CVMIN sy-vline 
WA_SMCHB_STR-/CWM/CVMEI sy-vline 
WA_SMCHB_STR-/CWM/CVMSP sy-vline 
WA_SMCHB_STR-/CWM/CVMRE sy-vline 
WA_SMCHB_STR-/CWM/CVMUM sy-vline 
WA_SMCHB_STR-/CWM/CLABS_OLD sy-vline 
WA_SMCHB_STR-/CWM/CINSM_OLD sy-vline 
WA_SMCHB_STR-/CWM/CEINM_OLD sy-vline 
WA_SMCHB_STR-/CWM/CSPEM_OLD sy-vline 
WA_SMCHB_STR-/CWM/CRETM_OLD sy-vline 
WA_SMCHB_STR-/CWM/CUMLM_OLD sy-vline 
WA_SMCHB_STR-/CWM/CVMLA_OLD sy-vline 
WA_SMCHB_STR-/CWM/CVMIN_OLD sy-vline 
WA_SMCHB_STR-/CWM/CVMEI_OLD sy-vline 
WA_SMCHB_STR-/CWM/CVMSP_OLD sy-vline 
WA_SMCHB_STR-/CWM/CVMRE_OLD sy-vline 
WA_SMCHB_STR-/CWM/CVMUM_OLD sy-vline 
WA_SMCHB_STR-FSH_SEASON_YEAR sy-vline 
WA_SMCHB_STR-FSH_SEASON sy-vline 
WA_SMCHB_STR-FSH_COLLECTION sy-vline 
WA_SMCHB_STR-FSH_THEME sy-vline 
WA_SMCHB_STR-FSH_SALLOC_QTY sy-vline 
WA_SMCHB_STR-FSH_SALLOC_QTY_OLD sy-vline      INTO ld_text SEPARATED BY SPACE.

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