ABAP Select data from SAP table E3SEGMH into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP E3SEGMH 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 E3SEGMH. 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 E3SEGMH 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_E3SEGMH TYPE STANDARD TABLE OF E3SEGMH,
      WA_E3SEGMH TYPE E3SEGMH,
      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: <E3SEGMH> TYPE E3SEGMH.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_E3SEGMH.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM E3SEGMH
  INTO TABLE IT_E3SEGMH.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM E3SEGMH
*  INTO TABLE @DATA(IT_E3SEGMH2).
*--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_E3SEGMH INDEX 1 INTO DATA(WA_E3SEGMH2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_E3SEGMH ASSIGNING <E3SEGMH>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<E3SEGMH>-SEGMENTTYP = 1.
<E3SEGMH>-SEGMENTDEF = 1.
<E3SEGMH>-SEGLEN = 1.
<E3SEGMH>-PARSEG = 1.
<E3SEGMH>-PARPNO = 1.

ENDLOOP.

LOOP AT IT_E3SEGMH INTO WA_E3SEGMH.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_E3SEGMH-PARFLG, sy-vline,
  WA_E3SEGMH-MUSTFL, sy-vline,
  WA_E3SEGMH-OCCMIN, sy-vline,
  WA_E3SEGMH-OCCMAX, sy-vline,
  WA_E3SEGMH-HLEVEL, sy-vline,
  WA_E3SEGMH-DESCRP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_E3SEGMH 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_E3SEGMH 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_E3SEGMH INTO WA_E3SEGMH.


*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_E3SEGMH_STR, 
SEGMENTTYP TYPE STRING,
SEGMENTDEF TYPE STRING,
SEGLEN TYPE STRING,
PARSEG TYPE STRING,
PARPNO TYPE STRING,
PARFLG TYPE STRING,
MUSTFL TYPE STRING,
OCCMIN TYPE STRING,
OCCMAX TYPE STRING,
HLEVEL TYPE STRING,
DESCRP TYPE STRING,
GRP_MUSTFL TYPE STRING,
GRP_OCCMIN TYPE STRING,
GRP_OCCMAX TYPE STRING,
REFSEGTYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_E3SEGMH_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_E3SEGMH_STR-SEGMENTTYP sy-vline 
WA_E3SEGMH_STR-SEGMENTDEF sy-vline 
WA_E3SEGMH_STR-SEGLEN sy-vline 
WA_E3SEGMH_STR-PARSEG sy-vline 
WA_E3SEGMH_STR-PARPNO sy-vline 
WA_E3SEGMH_STR-PARFLG sy-vline 
WA_E3SEGMH_STR-MUSTFL sy-vline 
WA_E3SEGMH_STR-OCCMIN sy-vline 
WA_E3SEGMH_STR-OCCMAX sy-vline 
WA_E3SEGMH_STR-HLEVEL sy-vline 
WA_E3SEGMH_STR-DESCRP sy-vline 
WA_E3SEGMH_STR-GRP_MUSTFL sy-vline 
WA_E3SEGMH_STR-GRP_OCCMIN sy-vline 
WA_E3SEGMH_STR-GRP_OCCMAX sy-vline 
WA_E3SEGMH_STR-REFSEGTYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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