ABAP Select data from SAP table DMC_KEY_COL_VERS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DMC_KEY_COL_VERS
*  INTO TABLE @DATA(IT_DMC_KEY_COL_VERS2).
*--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_DMC_KEY_COL_VERS INDEX 1 INTO DATA(WA_DMC_KEY_COL_VERS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DMC_KEY_COL_VERS>-OBJECT = 1.
<DMC_KEY_COL_VERS>-VERSION = 1.
<DMC_KEY_COL_VERS>-TABNAME = 1.
<DMC_KEY_COL_VERS>-FIELD01 = 1.
<DMC_KEY_COL_VERS>-LENGTH01 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DMC_KEY_COL_VERS-FIELD02, sy-vline,
  WA_DMC_KEY_COL_VERS-LENGTH02, sy-vline,
  WA_DMC_KEY_COL_VERS-FIELD03, sy-vline,
  WA_DMC_KEY_COL_VERS-LENGTH03, sy-vline,
  WA_DMC_KEY_COL_VERS-FIELD04, sy-vline,
  WA_DMC_KEY_COL_VERS-LENGTH04, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DMC_KEY_COL_VERS 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_DMC_KEY_COL_VERS 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_DMC_KEY_COL_VERS INTO WA_DMC_KEY_COL_VERS.


*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_DMC_KEY_COL_VERS_STR, 
OBJECT TYPE STRING,
VERSION TYPE STRING,
TABNAME TYPE STRING,
FIELD01 TYPE STRING,
LENGTH01 TYPE STRING,
FIELD02 TYPE STRING,
LENGTH02 TYPE STRING,
FIELD03 TYPE STRING,
LENGTH03 TYPE STRING,
FIELD04 TYPE STRING,
LENGTH04 TYPE STRING,
FIELD05 TYPE STRING,
LENGTH05 TYPE STRING,
FIELD06 TYPE STRING,
LENGTH06 TYPE STRING,
FIELD07 TYPE STRING,
LENGTH07 TYPE STRING,
FIELD08 TYPE STRING,
LENGTH08 TYPE STRING,
FIELD09 TYPE STRING,
LENGTH09 TYPE STRING,
FIELD10 TYPE STRING,
LENGTH10 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DMC_KEY_COL_VERS_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_DMC_KEY_COL_VERS_STR-OBJECT sy-vline 
WA_DMC_KEY_COL_VERS_STR-VERSION sy-vline 
WA_DMC_KEY_COL_VERS_STR-TABNAME sy-vline 
WA_DMC_KEY_COL_VERS_STR-FIELD01 sy-vline 
WA_DMC_KEY_COL_VERS_STR-LENGTH01 sy-vline 
WA_DMC_KEY_COL_VERS_STR-FIELD02 sy-vline 
WA_DMC_KEY_COL_VERS_STR-LENGTH02 sy-vline 
WA_DMC_KEY_COL_VERS_STR-FIELD03 sy-vline 
WA_DMC_KEY_COL_VERS_STR-LENGTH03 sy-vline 
WA_DMC_KEY_COL_VERS_STR-FIELD04 sy-vline 
WA_DMC_KEY_COL_VERS_STR-LENGTH04 sy-vline 
WA_DMC_KEY_COL_VERS_STR-FIELD05 sy-vline 
WA_DMC_KEY_COL_VERS_STR-LENGTH05 sy-vline 
WA_DMC_KEY_COL_VERS_STR-FIELD06 sy-vline 
WA_DMC_KEY_COL_VERS_STR-LENGTH06 sy-vline 
WA_DMC_KEY_COL_VERS_STR-FIELD07 sy-vline 
WA_DMC_KEY_COL_VERS_STR-LENGTH07 sy-vline 
WA_DMC_KEY_COL_VERS_STR-FIELD08 sy-vline 
WA_DMC_KEY_COL_VERS_STR-LENGTH08 sy-vline 
WA_DMC_KEY_COL_VERS_STR-FIELD09 sy-vline 
WA_DMC_KEY_COL_VERS_STR-LENGTH09 sy-vline 
WA_DMC_KEY_COL_VERS_STR-FIELD10 sy-vline 
WA_DMC_KEY_COL_VERS_STR-LENGTH10 sy-vline      INTO ld_text SEPARATED BY SPACE.

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