ABAP Select data from SAP table ISEG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISEG
*  INTO TABLE @DATA(IT_ISEG2).
*--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_ISEG INDEX 1 INTO DATA(WA_ISEG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISEG>-MANDT = 1.
<ISEG>-IBLNR = 1.
<ISEG>-GJAHR = 1.
<ISEG>-ZEILI = 1.
<ISEG>-MATNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISEG-WERKS, sy-vline,
  WA_ISEG-LGORT, sy-vline,
  WA_ISEG-CHARG, sy-vline,
  WA_ISEG-SOBKZ, sy-vline,
  WA_ISEG-BSTAR, sy-vline,
  WA_ISEG-KDAUF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISEG 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_ISEG 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_ISEG INTO WA_ISEG.


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

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

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

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

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

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

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

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

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

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

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

*Conversion exit ABPSP, internal->external for field PS_PSP_PNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_ISEG-PS_PSP_PNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISEG-PS_PSP_PNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit ALPHA, internal->external for field DISUB_OWNER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ISEG-DISUB_OWNER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISEG-DISUB_OWNER.
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_ISEG_STR, 
MANDT TYPE STRING,
IBLNR TYPE STRING,
GJAHR TYPE STRING,
ZEILI TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
CHARG TYPE STRING,
SOBKZ TYPE STRING,
BSTAR TYPE STRING,
KDAUF TYPE STRING,
KDPOS TYPE STRING,
KDEIN TYPE STRING,
LIFNR TYPE STRING,
KUNNR TYPE STRING,
PLPLA TYPE STRING,
USNAM TYPE STRING,
AEDAT TYPE STRING,
USNAZ TYPE STRING,
ZLDAT TYPE STRING,
USNAD TYPE STRING,
BUDAT TYPE STRING,
XBLNI TYPE STRING,
XZAEL TYPE STRING,
XDIFF TYPE STRING,
XNZAE TYPE STRING,
XLOEK TYPE STRING,
XAMEI TYPE STRING,
BUCHM TYPE STRING,
XNULL TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
ERFMG TYPE STRING,
ERFME TYPE STRING,
MBLNR TYPE STRING,
MJAHR TYPE STRING,
ZEILE TYPE STRING,
NBLNR TYPE STRING,
DMBTR TYPE STRING,
WAERS TYPE STRING,
ABCIN TYPE STRING,
PS_PSP_PNR TYPE STRING,
VKWRT TYPE STRING,
EXVKW TYPE STRING,
BUCHW TYPE STRING,
KWART TYPE STRING,
VKWRA TYPE STRING,
VKMZL TYPE STRING,
VKNZL TYPE STRING,
WRTZL TYPE STRING,
WRTBM TYPE STRING,
DIWZL TYPE STRING,
ATTYP TYPE STRING,
GRUND TYPE STRING,
SAMAT TYPE STRING,
XDISPATCH TYPE STRING,
SGT_SCAT TYPE STRING,
LASTCHANGE_DATETIME TYPE STRING,
DUMMY_ISEG_INCL_EEW_PS TYPE STRING,
/CWM/BUCHM TYPE STRING,
/CWM/XNULL TYPE STRING,
/CWM/MENGE TYPE STRING,
/CWM/MEINS TYPE STRING,
/CWM/ERFMG TYPE STRING,
/CWM/ERFME TYPE STRING,
/CWM/ZEILE2 TYPE STRING,
DISUB_OWNER TYPE STRING,
FSH_SEASON_YEAR TYPE STRING,
FSH_SEASON TYPE STRING,
FSH_COLLECTION TYPE STRING,
FSH_THEME TYPE STRING,
WSTI_COUNTDATE TYPE STRING,
WSTI_COUNTTIME TYPE STRING,
WSTI_FREEZEDATE TYPE STRING,
WSTI_FREEZETIME TYPE STRING,
WSTI_POSM TYPE STRING,
WSTI_POSW TYPE STRING,
WSTI_XCALC TYPE STRING,
WSTI_ENTERDATE TYPE STRING,
WSTI_ENTERTIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISEG_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_ISEG_STR-MANDT sy-vline 
WA_ISEG_STR-IBLNR sy-vline 
WA_ISEG_STR-GJAHR sy-vline 
WA_ISEG_STR-ZEILI sy-vline 
WA_ISEG_STR-MATNR sy-vline 
WA_ISEG_STR-WERKS sy-vline 
WA_ISEG_STR-LGORT sy-vline 
WA_ISEG_STR-CHARG sy-vline 
WA_ISEG_STR-SOBKZ sy-vline 
WA_ISEG_STR-BSTAR sy-vline 
WA_ISEG_STR-KDAUF sy-vline 
WA_ISEG_STR-KDPOS sy-vline 
WA_ISEG_STR-KDEIN sy-vline 
WA_ISEG_STR-LIFNR sy-vline 
WA_ISEG_STR-KUNNR sy-vline 
WA_ISEG_STR-PLPLA sy-vline 
WA_ISEG_STR-USNAM sy-vline 
WA_ISEG_STR-AEDAT sy-vline 
WA_ISEG_STR-USNAZ sy-vline 
WA_ISEG_STR-ZLDAT sy-vline 
WA_ISEG_STR-USNAD sy-vline 
WA_ISEG_STR-BUDAT sy-vline 
WA_ISEG_STR-XBLNI sy-vline 
WA_ISEG_STR-XZAEL sy-vline 
WA_ISEG_STR-XDIFF sy-vline 
WA_ISEG_STR-XNZAE sy-vline 
WA_ISEG_STR-XLOEK sy-vline 
WA_ISEG_STR-XAMEI sy-vline 
WA_ISEG_STR-BUCHM sy-vline 
WA_ISEG_STR-XNULL sy-vline 
WA_ISEG_STR-MENGE sy-vline 
WA_ISEG_STR-MEINS sy-vline 
WA_ISEG_STR-ERFMG sy-vline 
WA_ISEG_STR-ERFME sy-vline 
WA_ISEG_STR-MBLNR sy-vline 
WA_ISEG_STR-MJAHR sy-vline 
WA_ISEG_STR-ZEILE sy-vline 
WA_ISEG_STR-NBLNR sy-vline 
WA_ISEG_STR-DMBTR sy-vline 
WA_ISEG_STR-WAERS sy-vline 
WA_ISEG_STR-ABCIN sy-vline 
WA_ISEG_STR-PS_PSP_PNR sy-vline 
WA_ISEG_STR-VKWRT sy-vline 
WA_ISEG_STR-EXVKW sy-vline 
WA_ISEG_STR-BUCHW sy-vline 
WA_ISEG_STR-KWART sy-vline 
WA_ISEG_STR-VKWRA sy-vline 
WA_ISEG_STR-VKMZL sy-vline 
WA_ISEG_STR-VKNZL sy-vline 
WA_ISEG_STR-WRTZL sy-vline 
WA_ISEG_STR-WRTBM sy-vline 
WA_ISEG_STR-DIWZL sy-vline 
WA_ISEG_STR-ATTYP sy-vline 
WA_ISEG_STR-GRUND sy-vline 
WA_ISEG_STR-SAMAT sy-vline 
WA_ISEG_STR-XDISPATCH sy-vline 
WA_ISEG_STR-SGT_SCAT sy-vline 
WA_ISEG_STR-LASTCHANGE_DATETIME sy-vline 
WA_ISEG_STR-DUMMY_ISEG_INCL_EEW_PS sy-vline 
WA_ISEG_STR-/CWM/BUCHM sy-vline 
WA_ISEG_STR-/CWM/XNULL sy-vline 
WA_ISEG_STR-/CWM/MENGE sy-vline 
WA_ISEG_STR-/CWM/MEINS sy-vline 
WA_ISEG_STR-/CWM/ERFMG sy-vline 
WA_ISEG_STR-/CWM/ERFME sy-vline 
WA_ISEG_STR-/CWM/ZEILE2 sy-vline 
WA_ISEG_STR-DISUB_OWNER sy-vline 
WA_ISEG_STR-FSH_SEASON_YEAR sy-vline 
WA_ISEG_STR-FSH_SEASON sy-vline 
WA_ISEG_STR-FSH_COLLECTION sy-vline 
WA_ISEG_STR-FSH_THEME sy-vline 
WA_ISEG_STR-WSTI_COUNTDATE sy-vline 
WA_ISEG_STR-WSTI_COUNTTIME sy-vline 
WA_ISEG_STR-WSTI_FREEZEDATE sy-vline 
WA_ISEG_STR-WSTI_FREEZETIME sy-vline 
WA_ISEG_STR-WSTI_POSM sy-vline 
WA_ISEG_STR-WSTI_POSW sy-vline 
WA_ISEG_STR-WSTI_XCALC sy-vline 
WA_ISEG_STR-WSTI_ENTERDATE sy-vline 
WA_ISEG_STR-WSTI_ENTERTIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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