ABAP Select data from SAP table E2STZUM into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP E2STZUM 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 E2STZUM. 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 E2STZUM 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_E2STZUM TYPE STANDARD TABLE OF E2STZUM,
      WA_E2STZUM TYPE E2STZUM,
      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: <E2STZUM> TYPE E2STZUM.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_E2STZUM.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM E2STZUM
  INTO TABLE IT_E2STZUM.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM E2STZUM
*  INTO TABLE @DATA(IT_E2STZUM2).
*--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_E2STZUM INDEX 1 INTO DATA(WA_E2STZUM2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_E2STZUM ASSIGNING <E2STZUM>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<E2STZUM>-MSGFN = 1.
<E2STZUM>-STLTY = 1.
<E2STZUM>-STLNR = 1.
<E2STZUM>-STLAN = 1.
<E2STZUM>-EXSTL = 1.

ENDLOOP.

LOOP AT IT_E2STZUM INTO WA_E2STZUM.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_E2STZUM-ALTST, sy-vline,
  WA_E2STZUM-VARST, sy-vline,
  WA_E2STZUM-KBAUS, sy-vline,
  WA_E2STZUM-LTXSP, sy-vline,
  WA_E2STZUM-STLBE, sy-vline,
  WA_E2STZUM-ZTEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_E2STZUM 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_E2STZUM 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_E2STZUM INTO WA_E2STZUM.


*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 NUMCV, internal->external for field STLNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_E2STZUM-STLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_E2STZUM-STLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AENRL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_E2STZUM-AENRL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_E2STZUM-AENRL.
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_E2STZUM_STR, 
MSGFN TYPE STRING,
STLTY TYPE STRING,
STLNR TYPE STRING,
STLAN TYPE STRING,
EXSTL TYPE STRING,
ALTST TYPE STRING,
VARST TYPE STRING,
KBAUS TYPE STRING,
LTXSP TYPE STRING,
STLBE TYPE STRING,
ZTEXT TYPE STRING,
AENRL TYPE STRING,
STLDT TYPE STRING,
STLTM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_E2STZUM_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_E2STZUM_STR-MSGFN sy-vline 
WA_E2STZUM_STR-STLTY sy-vline 
WA_E2STZUM_STR-STLNR sy-vline 
WA_E2STZUM_STR-STLAN sy-vline 
WA_E2STZUM_STR-EXSTL sy-vline 
WA_E2STZUM_STR-ALTST sy-vline 
WA_E2STZUM_STR-VARST sy-vline 
WA_E2STZUM_STR-KBAUS sy-vline 
WA_E2STZUM_STR-LTXSP sy-vline 
WA_E2STZUM_STR-STLBE sy-vline 
WA_E2STZUM_STR-ZTEXT sy-vline 
WA_E2STZUM_STR-AENRL sy-vline 
WA_E2STZUM_STR-STLDT sy-vline 
WA_E2STZUM_STR-STLTM sy-vline      INTO ld_text SEPARATED BY SPACE.

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