ABAP Select data from SAP table /ISDFPS/EHMSGHDR into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /ISDFPS/EHMSGHDR 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 /ISDFPS/EHMSGHDR. 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 /ISDFPS/EHMSGHDR 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_/ISDFPS/EHMSGHDR TYPE STANDARD TABLE OF /ISDFPS/EHMSGHDR,
      WA_/ISDFPS/EHMSGHDR TYPE /ISDFPS/EHMSGHDR,
      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: </ISDFPS/EHMSGHDR> TYPE /ISDFPS/EHMSGHDR.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /ISDFPS/EHMSGHDR
  INTO TABLE IT_/ISDFPS/EHMSGHDR.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /ISDFPS/EHMSGHDR
*  INTO TABLE @DATA(IT_/ISDFPS/EHMSGHDR2).
*--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_/ISDFPS/EHMSGHDR INDEX 1 INTO DATA(WA_/ISDFPS/EHMSGHDR2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/ISDFPS/EHMSGHDR ASSIGNING </ISDFPS/EHMSGHDR>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</ISDFPS/EHMSGHDR>-MANDT = 1.
</ISDFPS/EHMSGHDR>-MESSAGE_ID = 1.
</ISDFPS/EHMSGHDR>-LOGSYS = 1.
</ISDFPS/EHMSGHDR>-STATE_CATEGORY = 1.
</ISDFPS/EHMSGHDR>-STATUS = 1.

ENDLOOP.

LOOP AT IT_/ISDFPS/EHMSGHDR INTO WA_/ISDFPS/EHMSGHDR.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/ISDFPS/EHMSGHDR-MSG_TYPE, sy-vline,
  WA_/ISDFPS/EHMSGHDR-DEVICE_SENDER_ID, sy-vline,
  WA_/ISDFPS/EHMSGHDR-DEVICE_NAME, sy-vline,
  WA_/ISDFPS/EHMSGHDR-SWCV_GUID, sy-vline,
  WA_/ISDFPS/EHMSGHDR-MBO_NAME, sy-vline,
  WA_/ISDFPS/EHMSGHDR-EXTRACT_KEY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/ISDFPS/EHMSGHDR 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_/ISDFPS/EHMSGHDR 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_/ISDFPS/EHMSGHDR INTO WA_/ISDFPS/EHMSGHDR.


*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 ALPHA, internal->external for field LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/ISDFPS/EHMSGHDR-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ISDFPS/EHMSGHDR-LOGSYS.
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_/ISDFPS/EHMSGHDR_STR, 
MANDT TYPE STRING,
MESSAGE_ID TYPE STRING,
LOGSYS TYPE STRING,
STATE_CATEGORY TYPE STRING,
STATUS TYPE STRING,
MSG_TYPE TYPE STRING,
DEVICE_SENDER_ID TYPE STRING,
DEVICE_NAME TYPE STRING,
SWCV_GUID TYPE STRING,
MBO_NAME TYPE STRING,
EXTRACT_KEY TYPE STRING,
SEND_TSTMP TYPE STRING,
SEND_USER TYPE STRING,
RESTART_ALLOWED TYPE STRING,
IS_RESTART TYPE STRING,
ORIGINAL_MSG TYPE STRING,
MBO_TRANS TYPE STRING,
CLNT_MSG_ID TYPE STRING,
MOD_USER TYPE STRING,
BODY_DATA TYPE STRING,
BODY_FORMAT TYPE STRING,
FUNCTION_MODULE TYPE STRING,
OBJECT_LABEL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/ISDFPS/EHMSGHDR_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_/ISDFPS/EHMSGHDR_STR-MANDT sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-MESSAGE_ID sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-LOGSYS sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-STATE_CATEGORY sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-STATUS sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-MSG_TYPE sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-DEVICE_SENDER_ID sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-DEVICE_NAME sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-SWCV_GUID sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-MBO_NAME sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-EXTRACT_KEY sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-SEND_TSTMP sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-SEND_USER sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-RESTART_ALLOWED sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-IS_RESTART sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-ORIGINAL_MSG sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-MBO_TRANS sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-CLNT_MSG_ID sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-MOD_USER sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-BODY_DATA sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-BODY_FORMAT sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-FUNCTION_MODULE sy-vline 
WA_/ISDFPS/EHMSGHDR_STR-OBJECT_LABEL sy-vline      INTO ld_text SEPARATED BY SPACE.

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