ABAP Select data from SAP table ATPMSG 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 ATPMSG 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 ATPMSG. 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 ATPMSG 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_ATPMSG TYPE STANDARD TABLE OF ATPMSG,
      WA_ATPMSG TYPE ATPMSG,
      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: <ATPMSG> TYPE ATPMSG.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ATPMSG
*  INTO TABLE @DATA(IT_ATPMSG2).
*--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_ATPMSG INDEX 1 INTO DATA(WA_ATPMSG2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ATPMSG-MSGV3, sy-vline,
  WA_ATPMSG-MSGV4, sy-vline,
  WA_ATPMSG-TYPE, sy-vline,
  WA_ATPMSG-ID, sy-vline,
  WA_ATPMSG-NUMBER, sy-vline,
  WA_ATPMSG-MESSAGE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ATPMSG 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_ATPMSG 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_ATPMSG INTO WA_ATPMSG.


*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 SYSTEM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ATPMSG-SYSTEM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ATPMSG-SYSTEM.
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_ATPMSG_STR, 
MSGID TYPE STRING,
MSGTY TYPE STRING,
MSGNO TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
TYPE TYPE STRING,
ID TYPE STRING,
NUMBER TYPE STRING,
MESSAGE TYPE STRING,
LOG_NO TYPE STRING,
LOG_MSG_NO TYPE STRING,
MESSAGE_V1 TYPE STRING,
MESSAGE_V2 TYPE STRING,
MESSAGE_V3 TYPE STRING,
MESSAGE_V4 TYPE STRING,
PARAMETER TYPE STRING,
ROW TYPE STRING,
FIELD TYPE STRING,
SYSTEM TYPE STRING,
XLINE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ATPMSG_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_ATPMSG_STR-MSGID sy-vline 
WA_ATPMSG_STR-MSGTY sy-vline 
WA_ATPMSG_STR-MSGNO sy-vline 
WA_ATPMSG_STR-MSGV1 sy-vline 
WA_ATPMSG_STR-MSGV2 sy-vline 
WA_ATPMSG_STR-MSGV3 sy-vline 
WA_ATPMSG_STR-MSGV4 sy-vline 
WA_ATPMSG_STR-TYPE sy-vline 
WA_ATPMSG_STR-ID sy-vline 
WA_ATPMSG_STR-NUMBER sy-vline 
WA_ATPMSG_STR-MESSAGE sy-vline 
WA_ATPMSG_STR-LOG_NO sy-vline 
WA_ATPMSG_STR-LOG_MSG_NO sy-vline 
WA_ATPMSG_STR-MESSAGE_V1 sy-vline 
WA_ATPMSG_STR-MESSAGE_V2 sy-vline 
WA_ATPMSG_STR-MESSAGE_V3 sy-vline 
WA_ATPMSG_STR-MESSAGE_V4 sy-vline 
WA_ATPMSG_STR-PARAMETER sy-vline 
WA_ATPMSG_STR-ROW sy-vline 
WA_ATPMSG_STR-FIELD sy-vline 
WA_ATPMSG_STR-SYSTEM sy-vline 
WA_ATPMSG_STR-XLINE sy-vline      INTO ld_text SEPARATED BY SPACE.

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