ABAP Select data from SAP table ESD_MESSAGE_S into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ESD_MESSAGE_S
*  INTO TABLE @DATA(IT_ESD_MESSAGE_S2).
*--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_ESD_MESSAGE_S INDEX 1 INTO DATA(WA_ESD_MESSAGE_S2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ESD_MESSAGE_S>-OBJ_TYPE = 1.
<ESD_MESSAGE_S>-OBJECT = 1.
<ESD_MESSAGE_S>-OBJ_NAME = 1.
<ESD_MESSAGE_S>-SYSUBRC = 1.
<ESD_MESSAGE_S>-MSG_HEADER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ESD_MESSAGE_S-MSGTY, sy-vline,
  WA_ESD_MESSAGE_S-MSGID, sy-vline,
  WA_ESD_MESSAGE_S-MSGNO, sy-vline,
  WA_ESD_MESSAGE_S-MSGV1, sy-vline,
  WA_ESD_MESSAGE_S-MSGV2, sy-vline,
  WA_ESD_MESSAGE_S-MSGV3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ESD_MESSAGE_S 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_ESD_MESSAGE_S 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_ESD_MESSAGE_S INTO WA_ESD_MESSAGE_S.


*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_ESD_MESSAGE_S_STR, 
OBJ_TYPE TYPE STRING,
OBJECT TYPE STRING,
OBJ_NAME TYPE STRING,
SYSUBRC TYPE STRING,
MSG_HEADER TYPE STRING,
MSGTY TYPE STRING,
MSGID TYPE STRING,
MSGNO TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
NAME TYPE STRING,
TYPE TYPE STRING,
SUBTYPE TYPE STRING,
NAMESPACE TYPE STRING,
DEVCLASS TYPE STRING,
AUTHOR TYPE STRING,
NAVPATH TYPE STRING,
SHOW_REQUEST TYPE STRING,
EDIT_REQUEST TYPE STRING,
DETAIL_REQUEST TYPE STRING,
EXCEPTION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ESD_MESSAGE_S_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_ESD_MESSAGE_S_STR-OBJ_TYPE sy-vline 
WA_ESD_MESSAGE_S_STR-OBJECT sy-vline 
WA_ESD_MESSAGE_S_STR-OBJ_NAME sy-vline 
WA_ESD_MESSAGE_S_STR-SYSUBRC sy-vline 
WA_ESD_MESSAGE_S_STR-MSG_HEADER sy-vline 
WA_ESD_MESSAGE_S_STR-MSGTY sy-vline 
WA_ESD_MESSAGE_S_STR-MSGID sy-vline 
WA_ESD_MESSAGE_S_STR-MSGNO sy-vline 
WA_ESD_MESSAGE_S_STR-MSGV1 sy-vline 
WA_ESD_MESSAGE_S_STR-MSGV2 sy-vline 
WA_ESD_MESSAGE_S_STR-MSGV3 sy-vline 
WA_ESD_MESSAGE_S_STR-MSGV4 sy-vline 
WA_ESD_MESSAGE_S_STR-NAME sy-vline 
WA_ESD_MESSAGE_S_STR-TYPE sy-vline 
WA_ESD_MESSAGE_S_STR-SUBTYPE sy-vline 
WA_ESD_MESSAGE_S_STR-NAMESPACE sy-vline 
WA_ESD_MESSAGE_S_STR-DEVCLASS sy-vline 
WA_ESD_MESSAGE_S_STR-AUTHOR sy-vline 
WA_ESD_MESSAGE_S_STR-NAVPATH sy-vline 
WA_ESD_MESSAGE_S_STR-SHOW_REQUEST sy-vline 
WA_ESD_MESSAGE_S_STR-EDIT_REQUEST sy-vline 
WA_ESD_MESSAGE_S_STR-DETAIL_REQUEST sy-vline 
WA_ESD_MESSAGE_S_STR-EXCEPTION sy-vline      INTO ld_text SEPARATED BY SPACE.

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