ABAP Select data from SAP table MMBSD_DRSEG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMBSD_DRSEG
*  INTO TABLE @DATA(IT_MMBSD_DRSEG2).
*--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_MMBSD_DRSEG INDEX 1 INTO DATA(WA_MMBSD_DRSEG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMBSD_DRSEG>-BELNR = 1.
<MMBSD_DRSEG>-GJAHR = 1.
<MMBSD_DRSEG>-BUZEI = 1.
<MMBSD_DRSEG>-EBELN = 1.
<MMBSD_DRSEG>-EBELP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMBSD_DRSEG-PSTYP, sy-vline,
  WA_MMBSD_DRSEG-SRVPOS, sy-vline,
  WA_MMBSD_DRSEG-PACKNO, sy-vline,
  WA_MMBSD_DRSEG-INTROW, sy-vline,
  WA_MMBSD_DRSEG-SRVMAPKEY, sy-vline,
  WA_MMBSD_DRSEG-LEBRE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMBSD_DRSEG 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_MMBSD_DRSEG 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_MMBSD_DRSEG INTO WA_MMBSD_DRSEG.


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

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

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

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMBSD_DRSEG-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMBSD_DRSEG-LIFNR.
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_MMBSD_DRSEG_STR, 
BELNR TYPE STRING,
GJAHR TYPE STRING,
BUZEI TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
PSTYP TYPE STRING,
SRVPOS TYPE STRING,
PACKNO TYPE STRING,
INTROW TYPE STRING,
SRVMAPKEY TYPE STRING,
LEBRE TYPE STRING,
MATNR TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
SHKZG TYPE STRING,
ERP_CONTRACT_ID TYPE STRING,
ERP_CONTRACT_ITM TYPE STRING,
SRM_CONTRACT_ID TYPE STRING,
SRM_CONTRACT_ITM TYPE STRING,
ZEKKN TYPE STRING,
BUDAT TYPE STRING,
BUKRS TYPE STRING,
WERKS TYPE STRING,
LOGSY TYPE STRING,
KOART TYPE STRING,
QUNUM TYPE STRING,
QUPOS TYPE STRING,
XCONTRACT_PO TYPE STRING,
LIFNR TYPE STRING,
TBTKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMBSD_DRSEG_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_MMBSD_DRSEG_STR-BELNR sy-vline 
WA_MMBSD_DRSEG_STR-GJAHR sy-vline 
WA_MMBSD_DRSEG_STR-BUZEI sy-vline 
WA_MMBSD_DRSEG_STR-EBELN sy-vline 
WA_MMBSD_DRSEG_STR-EBELP sy-vline 
WA_MMBSD_DRSEG_STR-PSTYP sy-vline 
WA_MMBSD_DRSEG_STR-SRVPOS sy-vline 
WA_MMBSD_DRSEG_STR-PACKNO sy-vline 
WA_MMBSD_DRSEG_STR-INTROW sy-vline 
WA_MMBSD_DRSEG_STR-SRVMAPKEY sy-vline 
WA_MMBSD_DRSEG_STR-LEBRE sy-vline 
WA_MMBSD_DRSEG_STR-MATNR sy-vline 
WA_MMBSD_DRSEG_STR-MENGE sy-vline 
WA_MMBSD_DRSEG_STR-MEINS sy-vline 
WA_MMBSD_DRSEG_STR-SHKZG sy-vline 
WA_MMBSD_DRSEG_STR-ERP_CONTRACT_ID sy-vline 
WA_MMBSD_DRSEG_STR-ERP_CONTRACT_ITM sy-vline 
WA_MMBSD_DRSEG_STR-SRM_CONTRACT_ID sy-vline 
WA_MMBSD_DRSEG_STR-SRM_CONTRACT_ITM sy-vline 
WA_MMBSD_DRSEG_STR-ZEKKN sy-vline 
WA_MMBSD_DRSEG_STR-BUDAT sy-vline 
WA_MMBSD_DRSEG_STR-BUKRS sy-vline 
WA_MMBSD_DRSEG_STR-WERKS sy-vline 
WA_MMBSD_DRSEG_STR-LOGSY sy-vline 
WA_MMBSD_DRSEG_STR-KOART sy-vline 
WA_MMBSD_DRSEG_STR-QUNUM sy-vline 
WA_MMBSD_DRSEG_STR-QUPOS sy-vline 
WA_MMBSD_DRSEG_STR-XCONTRACT_PO sy-vline 
WA_MMBSD_DRSEG_STR-LIFNR sy-vline 
WA_MMBSD_DRSEG_STR-TBTKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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