ABAP Select data from SAP table SEGMENTS_I into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SEGMENTS_I
*  INTO TABLE @DATA(IT_SEGMENTS_I2).
*--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_SEGMENTS_I INDEX 1 INTO DATA(WA_SEGMENTS_I2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SEGMENTS_I>-E1WBB01 = 1.
<SEGMENTS_I>-E1WBB02 = 1.
<SEGMENTS_I>-E1WBB03 = 1.
<SEGMENTS_I>-E1WBB04 = 1.
<SEGMENTS_I>-E1WBB05 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SEGMENTS_I-E1WBB06, sy-vline,
  WA_SEGMENTS_I-E1WBB07, sy-vline,
  WA_SEGMENTS_I-E1WBB08, sy-vline,
  WA_SEGMENTS_I-E1WBB09, sy-vline,
  WA_SEGMENTS_I-E1WBB10, sy-vline,
  WA_SEGMENTS_I-E1WBB11, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SEGMENTS_I 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_SEGMENTS_I 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_SEGMENTS_I INTO WA_SEGMENTS_I.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_SEGMENTS_I_STR, 
E1WBB01 TYPE STRING,
E1WBB02 TYPE STRING,
E1WBB03 TYPE STRING,
E1WBB04 TYPE STRING,
E1WBB05 TYPE STRING,
E1WBB06 TYPE STRING,
E1WBB07 TYPE STRING,
E1WBB08 TYPE STRING,
E1WBB09 TYPE STRING,
E1WBB10 TYPE STRING,
E1WBB11 TYPE STRING,
E1WBB12 TYPE STRING,
E1WBB13 TYPE STRING,
E1WBB14 TYPE STRING,
E1WBB15 TYPE STRING,
E1WBB16 TYPE STRING,
E1WBB17 TYPE STRING,
E1WBB18 TYPE STRING,
E1WBB19 TYPE STRING,
E1WBB20 TYPE STRING,
E1WBB21 TYPE STRING,
E1WBB22 TYPE STRING,
E1WTADAL1 TYPE STRING,
E1WTADAL2 TYPE STRING,
E1WBBSC TYPE STRING,
E1WBBEM TYPE STRING,
E1WBBCH TYPE STRING,
E1WBBAH TYPE STRING,
E1WBBCL TYPE STRING,
E1WBB18_EXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SEGMENTS_I_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_SEGMENTS_I_STR-E1WBB01 sy-vline 
WA_SEGMENTS_I_STR-E1WBB02 sy-vline 
WA_SEGMENTS_I_STR-E1WBB03 sy-vline 
WA_SEGMENTS_I_STR-E1WBB04 sy-vline 
WA_SEGMENTS_I_STR-E1WBB05 sy-vline 
WA_SEGMENTS_I_STR-E1WBB06 sy-vline 
WA_SEGMENTS_I_STR-E1WBB07 sy-vline 
WA_SEGMENTS_I_STR-E1WBB08 sy-vline 
WA_SEGMENTS_I_STR-E1WBB09 sy-vline 
WA_SEGMENTS_I_STR-E1WBB10 sy-vline 
WA_SEGMENTS_I_STR-E1WBB11 sy-vline 
WA_SEGMENTS_I_STR-E1WBB12 sy-vline 
WA_SEGMENTS_I_STR-E1WBB13 sy-vline 
WA_SEGMENTS_I_STR-E1WBB14 sy-vline 
WA_SEGMENTS_I_STR-E1WBB15 sy-vline 
WA_SEGMENTS_I_STR-E1WBB16 sy-vline 
WA_SEGMENTS_I_STR-E1WBB17 sy-vline 
WA_SEGMENTS_I_STR-E1WBB18 sy-vline 
WA_SEGMENTS_I_STR-E1WBB19 sy-vline 
WA_SEGMENTS_I_STR-E1WBB20 sy-vline 
WA_SEGMENTS_I_STR-E1WBB21 sy-vline 
WA_SEGMENTS_I_STR-E1WBB22 sy-vline 
WA_SEGMENTS_I_STR-E1WTADAL1 sy-vline 
WA_SEGMENTS_I_STR-E1WTADAL2 sy-vline 
WA_SEGMENTS_I_STR-E1WBBSC sy-vline 
WA_SEGMENTS_I_STR-E1WBBEM sy-vline 
WA_SEGMENTS_I_STR-E1WBBCH sy-vline 
WA_SEGMENTS_I_STR-E1WBBAH sy-vline 
WA_SEGMENTS_I_STR-E1WBBCL sy-vline 
WA_SEGMENTS_I_STR-E1WBB18_EXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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