ABAP Select data from SAP table /IAM/S_CHANGE_LOG_DT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /IAM/S_CHANGE_LOG_DT 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 /IAM/S_CHANGE_LOG_DT. 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 /IAM/S_CHANGE_LOG_DT 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_/IAM/S_CHANGE_LOG_DT TYPE STANDARD TABLE OF /IAM/S_CHANGE_LOG_DT,
      WA_/IAM/S_CHANGE_LOG_DT TYPE /IAM/S_CHANGE_LOG_DT,
      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: </IAM/S_CHANGE_LOG_DT> TYPE /IAM/S_CHANGE_LOG_DT.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /IAM/S_CHANGE_LOG_DT
  INTO TABLE IT_/IAM/S_CHANGE_LOG_DT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /IAM/S_CHANGE_LOG_DT
*  INTO TABLE @DATA(IT_/IAM/S_CHANGE_LOG_DT2).
*--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_/IAM/S_CHANGE_LOG_DT INDEX 1 INTO DATA(WA_/IAM/S_CHANGE_LOG_DT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/IAM/S_CHANGE_LOG_DT ASSIGNING </IAM/S_CHANGE_LOG_DT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</IAM/S_CHANGE_LOG_DT>-FTEXT = 1.
</IAM/S_CHANGE_LOG_DT>-NODE_DESC = 1.
</IAM/S_CHANGE_LOG_DT>-OBJECT_CAT_TEXT = 1.
</IAM/S_CHANGE_LOG_DT>-OBJECT_EXT_ID = 1.
</IAM/S_CHANGE_LOG_DT>-VALUE_NEW = 1.

ENDLOOP.

LOOP AT IT_/IAM/S_CHANGE_LOG_DT INTO WA_/IAM/S_CHANGE_LOG_DT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/IAM/S_CHANGE_LOG_DT-VALUE_NEW_DESC, sy-vline,
  WA_/IAM/S_CHANGE_LOG_DT-VALUE_OLD, sy-vline,
  WA_/IAM/S_CHANGE_LOG_DT-VALUE_OLD_DESC, sy-vline,
  WA_/IAM/S_CHANGE_LOG_DT-CHANGED_BY_FULL_NAME, sy-vline,
  WA_/IAM/S_CHANGE_LOG_DT-UDATE, sy-vline,
  WA_/IAM/S_CHANGE_LOG_DT-UTIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/IAM/S_CHANGE_LOG_DT 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_/IAM/S_CHANGE_LOG_DT 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_/IAM/S_CHANGE_LOG_DT INTO WA_/IAM/S_CHANGE_LOG_DT.


*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 OBJECT_EXT_ID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/IAM/S_CHANGE_LOG_DT-OBJECT_EXT_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/IAM/S_CHANGE_LOG_DT-OBJECT_EXT_ID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CHANGENR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/IAM/S_CHANGE_LOG_DT-CHANGENR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/IAM/S_CHANGE_LOG_DT-CHANGENR.
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_/IAM/S_CHANGE_LOG_DT_STR, 
FTEXT TYPE STRING,
NODE_DESC TYPE STRING,
OBJECT_CAT_TEXT TYPE STRING,
OBJECT_EXT_ID TYPE STRING,
VALUE_NEW TYPE STRING,
VALUE_NEW_DESC TYPE STRING,
VALUE_OLD TYPE STRING,
VALUE_OLD_DESC TYPE STRING,
CHANGED_BY_FULL_NAME TYPE STRING,
UDATE TYPE STRING,
UTIME TYPE STRING,
CHANGE_IND TYPE STRING,
CHANGE_IND_DESC TYPE STRING,
CHANGENR TYPE STRING,
FNAME TYPE STRING,
EXTERNAL_ID TYPE STRING,
USERNAME TYPE STRING,
NODE_KEY TYPE STRING,
NODE_NAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/IAM/S_CHANGE_LOG_DT_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_/IAM/S_CHANGE_LOG_DT_STR-FTEXT sy-vline 
WA_/IAM/S_CHANGE_LOG_DT_STR-NODE_DESC sy-vline 
WA_/IAM/S_CHANGE_LOG_DT_STR-OBJECT_CAT_TEXT sy-vline 
WA_/IAM/S_CHANGE_LOG_DT_STR-OBJECT_EXT_ID sy-vline 
WA_/IAM/S_CHANGE_LOG_DT_STR-VALUE_NEW sy-vline 
WA_/IAM/S_CHANGE_LOG_DT_STR-VALUE_NEW_DESC sy-vline 
WA_/IAM/S_CHANGE_LOG_DT_STR-VALUE_OLD sy-vline 
WA_/IAM/S_CHANGE_LOG_DT_STR-VALUE_OLD_DESC sy-vline 
WA_/IAM/S_CHANGE_LOG_DT_STR-CHANGED_BY_FULL_NAME sy-vline 
WA_/IAM/S_CHANGE_LOG_DT_STR-UDATE sy-vline 
WA_/IAM/S_CHANGE_LOG_DT_STR-UTIME sy-vline 
WA_/IAM/S_CHANGE_LOG_DT_STR-CHANGE_IND sy-vline 
WA_/IAM/S_CHANGE_LOG_DT_STR-CHANGE_IND_DESC sy-vline 
WA_/IAM/S_CHANGE_LOG_DT_STR-CHANGENR sy-vline 
WA_/IAM/S_CHANGE_LOG_DT_STR-FNAME sy-vline 
WA_/IAM/S_CHANGE_LOG_DT_STR-EXTERNAL_ID sy-vline 
WA_/IAM/S_CHANGE_LOG_DT_STR-USERNAME sy-vline 
WA_/IAM/S_CHANGE_LOG_DT_STR-NODE_KEY sy-vline 
WA_/IAM/S_CHANGE_LOG_DT_STR-NODE_NAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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