ABAP Select data from SAP table COMT_IL_UPDDATA_ECMCHG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COMT_IL_UPDDATA_ECMCHG
*  INTO TABLE @DATA(IT_COMT_IL_UPDDATA_ECMCHG2).
*--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_COMT_IL_UPDDATA_ECMCHG INDEX 1 INTO DATA(WA_COMT_IL_UPDDATA_ECMCHG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<COMT_IL_UPDDATA_ECMCHG>-ILGUID = 1.
<COMT_IL_UPDDATA_ECMCHG>-VALID_TO = 1.
<COMT_IL_UPDDATA_ECMCHG>-SOURCEGUID = 1.
<COMT_IL_UPDDATA_ECMCHG>-DESTINGUID = 1.
<COMT_IL_UPDDATA_ECMCHG>-RELTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COMT_IL_UPDDATA_ECMCHG-LOGSYS, sy-vline,
  WA_COMT_IL_UPDDATA_ECMCHG-UPNAME, sy-vline,
  WA_COMT_IL_UPDDATA_ECMCHG-VALID_FROM, sy-vline,
  WA_COMT_IL_UPDDATA_ECMCHG-HISTEX, sy-vline,
  WA_COMT_IL_UPDDATA_ECMCHG-OBJGUID, sy-vline,
  WA_COMT_IL_UPDDATA_ECMCHG-OBJTYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_COMT_IL_UPDDATA_ECMCHG 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_COMT_IL_UPDDATA_ECMCHG 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_COMT_IL_UPDDATA_ECMCHG INTO WA_COMT_IL_UPDDATA_ECMCHG.


*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 TSTPS, internal->external for field VALID_TO
CALL FUNCTION 'CONVERSION_EXIT_TSTPS_OUTPUT'
  EXPORTING
    input =                      WA_COMT_IL_UPDDATA_ECMCHG-VALID_TO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMT_IL_UPDDATA_ECMCHG-VALID_TO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COMT_IL_UPDDATA_ECMCHG-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMT_IL_UPDDATA_ECMCHG-LOGSYS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTPS, internal->external for field VALID_FROM
CALL FUNCTION 'CONVERSION_EXIT_TSTPS_OUTPUT'
  EXPORTING
    input =                      WA_COMT_IL_UPDDATA_ECMCHG-VALID_FROM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMT_IL_UPDDATA_ECMCHG-VALID_FROM.
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_COMT_IL_UPDDATA_ECMCHG_STR, 
ILGUID TYPE STRING,
VALID_TO TYPE STRING,
SOURCEGUID TYPE STRING,
DESTINGUID TYPE STRING,
RELTYPE TYPE STRING,
LOGSYS TYPE STRING,
UPNAME TYPE STRING,
VALID_FROM TYPE STRING,
HISTEX TYPE STRING,
OBJGUID TYPE STRING,
OBJTYP TYPE STRING,
COUNTER TYPE STRING,
AETYP TYPE STRING,
AENNR TYPE STRING,
REL TYPE STRING,
CHANGE TYPE STRING,
XNOEVAL TYPE STRING,
XDEL TYPE STRING,
XNOSUCESSOR TYPE STRING,
XLEAVE TYPE STRING,
UPDAT TYPE STRING,
CHANGE_DOC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COMT_IL_UPDDATA_ECMCHG_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_COMT_IL_UPDDATA_ECMCHG_STR-ILGUID sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-VALID_TO sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-SOURCEGUID sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-DESTINGUID sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-RELTYPE sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-LOGSYS sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-UPNAME sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-VALID_FROM sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-HISTEX sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-OBJGUID sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-OBJTYP sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-COUNTER sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-AETYP sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-AENNR sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-REL sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-CHANGE sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-XNOEVAL sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-XDEL sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-XNOSUCESSOR sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-XLEAVE sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-UPDAT sy-vline 
WA_COMT_IL_UPDDATA_ECMCHG_STR-CHANGE_DOC sy-vline      INTO ld_text SEPARATED BY SPACE.

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