ABAP Select data from SAP table BMMSG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BMMSG
*  INTO TABLE @DATA(IT_BMMSG2).
*--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_BMMSG INDEX 1 INTO DATA(WA_BMMSG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BMMSG>-MSGID = 1.
<BMMSG>-MSGTY = 1.
<BMMSG>-MSGNO = 1.
<BMMSG>-MSGV1 = 1.
<BMMSG>-MSGV2 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BMMSG-MSGV3, sy-vline,
  WA_BMMSG-MSGV4, sy-vline,
  WA_BMMSG-MSGTXT, sy-vline,
  WA_BMMSG-OBJECTTYPE, sy-vline,
  WA_BMMSG-OBJECTID, sy-vline,
  WA_BMMSG-OBJECTTEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BMMSG 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_BMMSG 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_BMMSG INTO WA_BMMSG.


*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_BMMSG_STR, 
MSGID TYPE STRING,
MSGTY TYPE STRING,
MSGNO TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
MSGTXT TYPE STRING,
OBJECTTYPE TYPE STRING,
OBJECTID TYPE STRING,
OBJECTTEXT TYPE STRING,
SCRTEXT TYPE STRING,
ERRORCLASS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BMMSG_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_BMMSG_STR-MSGID sy-vline 
WA_BMMSG_STR-MSGTY sy-vline 
WA_BMMSG_STR-MSGNO sy-vline 
WA_BMMSG_STR-MSGV1 sy-vline 
WA_BMMSG_STR-MSGV2 sy-vline 
WA_BMMSG_STR-MSGV3 sy-vline 
WA_BMMSG_STR-MSGV4 sy-vline 
WA_BMMSG_STR-MSGTXT sy-vline 
WA_BMMSG_STR-OBJECTTYPE sy-vline 
WA_BMMSG_STR-OBJECTID sy-vline 
WA_BMMSG_STR-OBJECTTEXT sy-vline 
WA_BMMSG_STR-SCRTEXT sy-vline 
WA_BMMSG_STR-ERRORCLASS sy-vline      INTO ld_text SEPARATED BY SPACE.

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