ABAP Select data from SAP table EUMZCUSTOK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EUMZCUSTOK
*  INTO TABLE @DATA(IT_EUMZCUSTOK2).
*--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_EUMZCUSTOK INDEX 1 INTO DATA(WA_EUMZCUSTOK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EUMZCUSTOK>-ECSELECTALLC = 1.
<EUMZCUSTOK>-ECSELECTALLCF = 1.
<EUMZCUSTOK>-ECSELECTALLI = 1.
<EUMZCUSTOK>-MONODIALOG = 1.
<EUMZCUSTOK>-MONODIALOGF = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EUMZCUSTOK-TAKEVKONT, sy-vline,
  WA_EUMZCUSTOK-STORNODIALOG, sy-vline,
  WA_EUMZCUSTOK-MIIFNOMO, sy-vline,
  WA_EUMZCUSTOK-ENVTIME, sy-vline,
  WA_EUMZCUSTOK-CTRSWTCVKONT, sy-vline,
  WA_EUMZCUSTOK-SSWTCREASON, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EUMZCUSTOK 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_EUMZCUSTOK 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_EUMZCUSTOK INTO WA_EUMZCUSTOK.


*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_EUMZCUSTOK_STR, 
ECSELECTALLC TYPE STRING,
ECSELECTALLCF TYPE STRING,
ECSELECTALLI TYPE STRING,
MONODIALOG TYPE STRING,
MONODIALOGF TYPE STRING,
TAKEVKONT TYPE STRING,
STORNODIALOG TYPE STRING,
MIIFNOMO TYPE STRING,
ENVTIME TYPE STRING,
CTRSWTCVKONT TYPE STRING,
SSWTCREASON TYPE STRING,
SUBRREASON TYPE STRING,
MOMIBELSEL TYPE STRING,
ECPARTNERSEL TYPE STRING,
MO_LAYOUT TYPE STRING,
MOFLAYOUT TYPE STRING,
REVERSE_INVOICE TYPE STRING,
BCREASON TYPE STRING,
MI_LAYOUT TYPE STRING,
BU_FRGID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EUMZCUSTOK_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_EUMZCUSTOK_STR-ECSELECTALLC sy-vline 
WA_EUMZCUSTOK_STR-ECSELECTALLCF sy-vline 
WA_EUMZCUSTOK_STR-ECSELECTALLI sy-vline 
WA_EUMZCUSTOK_STR-MONODIALOG sy-vline 
WA_EUMZCUSTOK_STR-MONODIALOGF sy-vline 
WA_EUMZCUSTOK_STR-TAKEVKONT sy-vline 
WA_EUMZCUSTOK_STR-STORNODIALOG sy-vline 
WA_EUMZCUSTOK_STR-MIIFNOMO sy-vline 
WA_EUMZCUSTOK_STR-ENVTIME sy-vline 
WA_EUMZCUSTOK_STR-CTRSWTCVKONT sy-vline 
WA_EUMZCUSTOK_STR-SSWTCREASON sy-vline 
WA_EUMZCUSTOK_STR-SUBRREASON sy-vline 
WA_EUMZCUSTOK_STR-MOMIBELSEL sy-vline 
WA_EUMZCUSTOK_STR-ECPARTNERSEL sy-vline 
WA_EUMZCUSTOK_STR-MO_LAYOUT sy-vline 
WA_EUMZCUSTOK_STR-MOFLAYOUT sy-vline 
WA_EUMZCUSTOK_STR-REVERSE_INVOICE sy-vline 
WA_EUMZCUSTOK_STR-BCREASON sy-vline 
WA_EUMZCUSTOK_STR-MI_LAYOUT sy-vline 
WA_EUMZCUSTOK_STR-BU_FRGID sy-vline      INTO ld_text SEPARATED BY SPACE.

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