ABAP Select data from SAP table MYSEG_EXTRACT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MYSEG_EXTRACT
*  INTO TABLE @DATA(IT_MYSEG_EXTRACT2).
*--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_MYSEG_EXTRACT INDEX 1 INTO DATA(WA_MYSEG_EXTRACT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MYSEG_EXTRACT>-MANDT = 1.
<MYSEG_EXTRACT>-MATNR = 1.
<MYSEG_EXTRACT>-WERKS = 1.
<MYSEG_EXTRACT>-BUDAT = 1.
<MYSEG_EXTRACT>-MBLNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MYSEG_EXTRACT-MJAHR, sy-vline,
  WA_MYSEG_EXTRACT-ZEILE, sy-vline,
  WA_MYSEG_EXTRACT-BLART, sy-vline,
  WA_MYSEG_EXTRACT-CPUDT, sy-vline,
  WA_MYSEG_EXTRACT-CPUTM, sy-vline,
  WA_MYSEG_EXTRACT-VGART, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MYSEG_EXTRACT 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_MYSEG_EXTRACT 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_MYSEG_EXTRACT INTO WA_MYSEG_EXTRACT.


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

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

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

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

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

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

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

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

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

*Conversion exit MATN1, internal->external for field UMMAT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MYSEG_EXTRACT-UMMAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MYSEG_EXTRACT-UMMAT.
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_MYSEG_EXTRACT_STR, 
MANDT TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
BUDAT TYPE STRING,
MBLNR TYPE STRING,
MJAHR TYPE STRING,
ZEILE TYPE STRING,
BLART TYPE STRING,
CPUDT TYPE STRING,
CPUTM TYPE STRING,
VGART TYPE STRING,
AUFNR TYPE STRING,
AUFPS TYPE STRING,
BWART TYPE STRING,
BWTAR TYPE STRING,
DMBTR TYPE STRING,
LIFNR TYPE STRING,
MEINS TYPE STRING,
MENGE TYPE STRING,
SHKZG TYPE STRING,
SJAHR TYPE STRING,
SMBLN TYPE STRING,
SMBLP TYPE STRING,
BNBTR TYPE STRING,
BUSTW TYPE STRING,
EXBWR TYPE STRING,
KZBEW TYPE STRING,
KZVBR TYPE STRING,
KZZUG TYPE STRING,
MENGU TYPE STRING,
SOBKZ TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
UMMAT TYPE STRING,
UMSOK TYPE STRING,
UMWRK TYPE STRING,
VPRSV TYPE STRING,
WERTU TYPE STRING,
XAUTO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MYSEG_EXTRACT_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_MYSEG_EXTRACT_STR-MANDT sy-vline 
WA_MYSEG_EXTRACT_STR-MATNR sy-vline 
WA_MYSEG_EXTRACT_STR-WERKS sy-vline 
WA_MYSEG_EXTRACT_STR-BUDAT sy-vline 
WA_MYSEG_EXTRACT_STR-MBLNR sy-vline 
WA_MYSEG_EXTRACT_STR-MJAHR sy-vline 
WA_MYSEG_EXTRACT_STR-ZEILE sy-vline 
WA_MYSEG_EXTRACT_STR-BLART sy-vline 
WA_MYSEG_EXTRACT_STR-CPUDT sy-vline 
WA_MYSEG_EXTRACT_STR-CPUTM sy-vline 
WA_MYSEG_EXTRACT_STR-VGART sy-vline 
WA_MYSEG_EXTRACT_STR-AUFNR sy-vline 
WA_MYSEG_EXTRACT_STR-AUFPS sy-vline 
WA_MYSEG_EXTRACT_STR-BWART sy-vline 
WA_MYSEG_EXTRACT_STR-BWTAR sy-vline 
WA_MYSEG_EXTRACT_STR-DMBTR sy-vline 
WA_MYSEG_EXTRACT_STR-LIFNR sy-vline 
WA_MYSEG_EXTRACT_STR-MEINS sy-vline 
WA_MYSEG_EXTRACT_STR-MENGE sy-vline 
WA_MYSEG_EXTRACT_STR-SHKZG sy-vline 
WA_MYSEG_EXTRACT_STR-SJAHR sy-vline 
WA_MYSEG_EXTRACT_STR-SMBLN sy-vline 
WA_MYSEG_EXTRACT_STR-SMBLP sy-vline 
WA_MYSEG_EXTRACT_STR-BNBTR sy-vline 
WA_MYSEG_EXTRACT_STR-BUSTW sy-vline 
WA_MYSEG_EXTRACT_STR-EXBWR sy-vline 
WA_MYSEG_EXTRACT_STR-KZBEW sy-vline 
WA_MYSEG_EXTRACT_STR-KZVBR sy-vline 
WA_MYSEG_EXTRACT_STR-KZZUG sy-vline 
WA_MYSEG_EXTRACT_STR-MENGU sy-vline 
WA_MYSEG_EXTRACT_STR-SOBKZ sy-vline 
WA_MYSEG_EXTRACT_STR-EBELN sy-vline 
WA_MYSEG_EXTRACT_STR-EBELP sy-vline 
WA_MYSEG_EXTRACT_STR-UMMAT sy-vline 
WA_MYSEG_EXTRACT_STR-UMSOK sy-vline 
WA_MYSEG_EXTRACT_STR-UMWRK sy-vline 
WA_MYSEG_EXTRACT_STR-VPRSV sy-vline 
WA_MYSEG_EXTRACT_STR-WERTU sy-vline 
WA_MYSEG_EXTRACT_STR-XAUTO sy-vline      INTO ld_text SEPARATED BY SPACE.

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