ABAP Select data from SAP table DRSEG_SM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DRSEG_SM
*  INTO TABLE @DATA(IT_DRSEG_SM2).
*--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_DRSEG_SM INDEX 1 INTO DATA(WA_DRSEG_SM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DRSEG_SM>-MATNR = 1.
<DRSEG_SM>-ERFMG = 1.
<DRSEG_SM>-ERFME = 1.
<DRSEG_SM>-VPRSV = 1.
<DRSEG_SM>-VERPR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DRSEG_SM-STPRS, sy-vline,
  WA_DRSEG_SM-MLMAA, sy-vline,
  WA_DRSEG_SM-MLAST, sy-vline,
  WA_DRSEG_SM-BKLAS, sy-vline,
  WA_DRSEG_SM-LBKUM, sy-vline,
  WA_DRSEG_SM-SALK3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DRSEG_SM 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_DRSEG_SM 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_DRSEG_SM INTO WA_DRSEG_SM.


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

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

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

*Conversion exit MATN1, internal->external for field MATBF
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_DRSEG_SM-MATBF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DRSEG_SM-MATBF.
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_DRSEG_SM_STR, 
MATNR TYPE STRING,
ERFMG TYPE STRING,
ERFME TYPE STRING,
VPRSV TYPE STRING,
VERPR TYPE STRING,
STPRS TYPE STRING,
MLMAA TYPE STRING,
MLAST TYPE STRING,
BKLAS TYPE STRING,
LBKUM TYPE STRING,
SALK3 TYPE STRING,
GSBER TYPE STRING,
XLIFO TYPE STRING,
BASME TYPE STRING,
HRKFT TYPE STRING,
HKMAT TYPE STRING,
WAART TYPE STRING,
MATBF TYPE STRING,
VRKUM TYPE STRING,
VMSAL TYPE STRING,
VWERT TYPE STRING,
VWERR TYPE STRING,
VWALT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DRSEG_SM_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_DRSEG_SM_STR-MATNR sy-vline 
WA_DRSEG_SM_STR-ERFMG sy-vline 
WA_DRSEG_SM_STR-ERFME sy-vline 
WA_DRSEG_SM_STR-VPRSV sy-vline 
WA_DRSEG_SM_STR-VERPR sy-vline 
WA_DRSEG_SM_STR-STPRS sy-vline 
WA_DRSEG_SM_STR-MLMAA sy-vline 
WA_DRSEG_SM_STR-MLAST sy-vline 
WA_DRSEG_SM_STR-BKLAS sy-vline 
WA_DRSEG_SM_STR-LBKUM sy-vline 
WA_DRSEG_SM_STR-SALK3 sy-vline 
WA_DRSEG_SM_STR-GSBER sy-vline 
WA_DRSEG_SM_STR-XLIFO sy-vline 
WA_DRSEG_SM_STR-BASME sy-vline 
WA_DRSEG_SM_STR-HRKFT sy-vline 
WA_DRSEG_SM_STR-HKMAT sy-vline 
WA_DRSEG_SM_STR-WAART sy-vline 
WA_DRSEG_SM_STR-MATBF sy-vline 
WA_DRSEG_SM_STR-VRKUM sy-vline 
WA_DRSEG_SM_STR-VMSAL sy-vline 
WA_DRSEG_SM_STR-VWERT sy-vline 
WA_DRSEG_SM_STR-VWERR sy-vline 
WA_DRSEG_SM_STR-VWALT sy-vline      INTO ld_text SEPARATED BY SPACE.

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