ABAP Select data from SAP table CESEG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CESEG
*  INTO TABLE @DATA(IT_CESEG2).
*--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_CESEG INDEX 1 INTO DATA(WA_CESEG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CESEG>-SWAHL = 1.
<CESEG>-GWAHL = 1.
<CESEG>-LSIND = 1.
<CESEG>-CEPNN = 1.
<CESEG>-FNAM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CESEG-LNMI, sy-vline,
  WA_CESEG-LOW, sy-vline,
  WA_CESEG-HIGH, sy-vline,
  WA_CESEG-LNG, sy-vline,
  WA_CESEG-LNGW, sy-vline,
  WA_CESEG-MASK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CESEG 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_CESEG 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_CESEG INTO WA_CESEG.


*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_CESEG_STR, 
SWAHL TYPE STRING,
GWAHL TYPE STRING,
LSIND TYPE STRING,
CEPNN TYPE STRING,
FNAM TYPE STRING,
LNMI TYPE STRING,
LOW TYPE STRING,
HIGH TYPE STRING,
LNG TYPE STRING,
LNGW TYPE STRING,
MASK TYPE STRING,
LNGS TYPE STRING,
OFFS TYPE STRING,
SKTW TYPE STRING,
SPRINT TYPE STRING,
SDIR TYPE STRING,
S12DP TYPE STRING,
SNUM TYPE STRING,
BOPE TYPE STRING,
BPRINT TYPE STRING,
BWRT TYPE STRING,
BDIR TYPE STRING,
B12DP TYPE STRING,
BNUM TYPE STRING,
TEXTKEY TYPE STRING,
OPTION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CESEG_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_CESEG_STR-SWAHL sy-vline 
WA_CESEG_STR-GWAHL sy-vline 
WA_CESEG_STR-LSIND sy-vline 
WA_CESEG_STR-CEPNN sy-vline 
WA_CESEG_STR-FNAM sy-vline 
WA_CESEG_STR-LNMI sy-vline 
WA_CESEG_STR-LOW sy-vline 
WA_CESEG_STR-HIGH sy-vline 
WA_CESEG_STR-LNG sy-vline 
WA_CESEG_STR-LNGW sy-vline 
WA_CESEG_STR-MASK sy-vline 
WA_CESEG_STR-LNGS sy-vline 
WA_CESEG_STR-OFFS sy-vline 
WA_CESEG_STR-SKTW sy-vline 
WA_CESEG_STR-SPRINT sy-vline 
WA_CESEG_STR-SDIR sy-vline 
WA_CESEG_STR-S12DP sy-vline 
WA_CESEG_STR-SNUM sy-vline 
WA_CESEG_STR-BOPE sy-vline 
WA_CESEG_STR-BPRINT sy-vline 
WA_CESEG_STR-BWRT sy-vline 
WA_CESEG_STR-BDIR sy-vline 
WA_CESEG_STR-B12DP sy-vline 
WA_CESEG_STR-BNUM sy-vline 
WA_CESEG_STR-TEXTKEY sy-vline 
WA_CESEG_STR-OPTION sy-vline      INTO ld_text SEPARATED BY SPACE.

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