ABAP Select data from SAP table ETMSG_GUI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ETMSG_GUI
*  INTO TABLE @DATA(IT_ETMSG_GUI2).
*--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_ETMSG_GUI INDEX 1 INTO DATA(WA_ETMSG_GUI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ETMSG_GUI>-MODE = 1.
<ETMSG_GUI>-TCODE = 1.
<ETMSG_GUI>-DYNAME = 1.
<ETMSG_GUI>-DYNUMB = 1.
<ETMSG_GUI>-MSGTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ETMSG_GUI-MSGID, sy-vline,
  WA_ETMSG_GUI-MSGNR, sy-vline,
  WA_ETMSG_GUI-MSGV1, sy-vline,
  WA_ETMSG_GUI-MSGV2, sy-vline,
  WA_ETMSG_GUI-MSGV3, sy-vline,
  WA_ETMSG_GUI-MSGV4, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ETMSG_GUI 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_ETMSG_GUI 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_ETMSG_GUI INTO WA_ETMSG_GUI.


*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_ETMSG_GUI_STR, 
MODE TYPE STRING,
TCODE TYPE STRING,
DYNAME TYPE STRING,
DYNUMB TYPE STRING,
MSGTYP TYPE STRING,
MSGID TYPE STRING,
MSGNR TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
MSGV5 TYPE STRING,
MSGV6 TYPE STRING,
MSGV7 TYPE STRING,
MSGV8 TYPE STRING,
MSGTEXT TYPE STRING,
ASPOPUP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ETMSG_GUI_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_ETMSG_GUI_STR-MODE sy-vline 
WA_ETMSG_GUI_STR-TCODE sy-vline 
WA_ETMSG_GUI_STR-DYNAME sy-vline 
WA_ETMSG_GUI_STR-DYNUMB sy-vline 
WA_ETMSG_GUI_STR-MSGTYP sy-vline 
WA_ETMSG_GUI_STR-MSGID sy-vline 
WA_ETMSG_GUI_STR-MSGNR sy-vline 
WA_ETMSG_GUI_STR-MSGV1 sy-vline 
WA_ETMSG_GUI_STR-MSGV2 sy-vline 
WA_ETMSG_GUI_STR-MSGV3 sy-vline 
WA_ETMSG_GUI_STR-MSGV4 sy-vline 
WA_ETMSG_GUI_STR-MSGV5 sy-vline 
WA_ETMSG_GUI_STR-MSGV6 sy-vline 
WA_ETMSG_GUI_STR-MSGV7 sy-vline 
WA_ETMSG_GUI_STR-MSGV8 sy-vline 
WA_ETMSG_GUI_STR-MSGTEXT sy-vline 
WA_ETMSG_GUI_STR-ASPOPUP sy-vline      INTO ld_text SEPARATED BY SPACE.

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