ABAP Select data from SAP table ABMSG into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ABMSG
*  INTO TABLE @DATA(IT_ABMSG2).
*--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_ABMSG INDEX 1 INTO DATA(WA_ABMSG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ABMSG>-MSGID = 1.
<ABMSG>-MSGTXT = 1.
<ABMSG>-MSGTXTX = 1.
<ABMSG>-EVENT = 1.
<ABMSG>-EKIND = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ABMSG-CODE, sy-vline,
  WA_ABMSG-REPID, sy-vline,
  WA_ABMSG-IREPID, sy-vline,
  WA_ABMSG-LINNO, sy-vline,
  WA_ABMSG-MODUL, sy-vline,
  WA_ABMSG-MODLINE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ABMSG 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_ABMSG 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_ABMSG INTO WA_ABMSG.


*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_ABMSG_STR, 
MSGID TYPE STRING,
MSGTXT TYPE STRING,
MSGTXTX TYPE STRING,
EVENT TYPE STRING,
EKIND TYPE STRING,
CODE TYPE STRING,
REPID TYPE STRING,
IREPID TYPE STRING,
LINNO TYPE STRING,
MODUL TYPE STRING,
MODLINE TYPE STRING,
FUNCTION TYPE STRING,
MSGTXTX2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ABMSG_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_ABMSG_STR-MSGID sy-vline 
WA_ABMSG_STR-MSGTXT sy-vline 
WA_ABMSG_STR-MSGTXTX sy-vline 
WA_ABMSG_STR-EVENT sy-vline 
WA_ABMSG_STR-EKIND sy-vline 
WA_ABMSG_STR-CODE sy-vline 
WA_ABMSG_STR-REPID sy-vline 
WA_ABMSG_STR-IREPID sy-vline 
WA_ABMSG_STR-LINNO sy-vline 
WA_ABMSG_STR-MODUL sy-vline 
WA_ABMSG_STR-MODLINE sy-vline 
WA_ABMSG_STR-FUNCTION sy-vline 
WA_ABMSG_STR-MSGTXTX2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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