ABAP Select data from SAP table ANST_TRACE_TCD_MSGEXT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ANST_TRACE_TCD_MSGEXT
*  INTO TABLE @DATA(IT_ANST_TRACE_TCD_MSGEXT2).
*--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_ANST_TRACE_TCD_MSGEXT INDEX 1 INTO DATA(WA_ANST_TRACE_TCD_MSGEXT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ANST_TRACE_TCD_MSGEXT>-TCODE = 1.
<ANST_TRACE_TCD_MSGEXT>-DYNAME = 1.
<ANST_TRACE_TCD_MSGEXT>-DYNUMB = 1.
<ANST_TRACE_TCD_MSGEXT>-MSGTYP = 1.
<ANST_TRACE_TCD_MSGEXT>-MSGSPRA = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ANST_TRACE_TCD_MSGEXT-MSGID, sy-vline,
  WA_ANST_TRACE_TCD_MSGEXT-MSGNR, sy-vline,
  WA_ANST_TRACE_TCD_MSGEXT-MSGV1, sy-vline,
  WA_ANST_TRACE_TCD_MSGEXT-MSGV2, sy-vline,
  WA_ANST_TRACE_TCD_MSGEXT-MSGV3, sy-vline,
  WA_ANST_TRACE_TCD_MSGEXT-MSGV4, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ANST_TRACE_TCD_MSGEXT 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_ANST_TRACE_TCD_MSGEXT 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_ANST_TRACE_TCD_MSGEXT INTO WA_ANST_TRACE_TCD_MSGEXT.


*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 ISOLA, internal->external for field MSGSPRA
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_ANST_TRACE_TCD_MSGEXT-MSGSPRA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ANST_TRACE_TCD_MSGEXT-MSGSPRA.
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_ANST_TRACE_TCD_MSGEXT_STR, 
TCODE TYPE STRING,
DYNAME TYPE STRING,
DYNUMB TYPE STRING,
MSGTYP TYPE STRING,
MSGSPRA TYPE STRING,
MSGID TYPE STRING,
MSGNR TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
ENV TYPE STRING,
FLDNAME TYPE STRING,
BDCMSGR TYPE STRING,
BDCMSGC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ANST_TRACE_TCD_MSGEXT_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_ANST_TRACE_TCD_MSGEXT_STR-TCODE sy-vline 
WA_ANST_TRACE_TCD_MSGEXT_STR-DYNAME sy-vline 
WA_ANST_TRACE_TCD_MSGEXT_STR-DYNUMB sy-vline 
WA_ANST_TRACE_TCD_MSGEXT_STR-MSGTYP sy-vline 
WA_ANST_TRACE_TCD_MSGEXT_STR-MSGSPRA sy-vline 
WA_ANST_TRACE_TCD_MSGEXT_STR-MSGID sy-vline 
WA_ANST_TRACE_TCD_MSGEXT_STR-MSGNR sy-vline 
WA_ANST_TRACE_TCD_MSGEXT_STR-MSGV1 sy-vline 
WA_ANST_TRACE_TCD_MSGEXT_STR-MSGV2 sy-vline 
WA_ANST_TRACE_TCD_MSGEXT_STR-MSGV3 sy-vline 
WA_ANST_TRACE_TCD_MSGEXT_STR-MSGV4 sy-vline 
WA_ANST_TRACE_TCD_MSGEXT_STR-ENV sy-vline 
WA_ANST_TRACE_TCD_MSGEXT_STR-FLDNAME sy-vline 
WA_ANST_TRACE_TCD_MSGEXT_STR-BDCMSGR sy-vline 
WA_ANST_TRACE_TCD_MSGEXT_STR-BDCMSGC sy-vline      INTO ld_text SEPARATED BY SPACE.

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