ABAP Select data from SAP table DMCTL into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DMCTL 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 DMCTL. 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 DMCTL 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_DMCTL TYPE STANDARD TABLE OF DMCTL,
      WA_DMCTL TYPE DMCTL,
      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: <DMCTL> TYPE DMCTL.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DMCTL
*  INTO TABLE @DATA(IT_DMCTL2).
*--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_DMCTL INDEX 1 INTO DATA(WA_DMCTL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DMCTL>-READ_ONLY = 1.
<DMCTL>-LIST_CREAT = 1.
<DMCTL>-LIST_AGAIN = 1.
<DMCTL>-OBJ_DELETE = 1.
<DMCTL>-KEEP_VALUE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DMCTL-EDI_CALLED, sy-vline,
  WA_DMCTL-OBJ_SAVED, sy-vline,
  WA_DMCTL-OBJ_NEW, sy-vline,
  WA_DMCTL-OBJ_LEAVE, sy-vline,
  WA_DMCTL-OBJ_END, sy-vline,
  WA_DMCTL-OBJ_CHANGE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DMCTL 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_DMCTL 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_DMCTL INTO WA_DMCTL.


*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_DMCTL_STR, 
READ_ONLY TYPE STRING,
LIST_CREAT TYPE STRING,
LIST_AGAIN TYPE STRING,
OBJ_DELETE TYPE STRING,
KEEP_VALUE TYPE STRING,
EDI_CALLED TYPE STRING,
OBJ_SAVED TYPE STRING,
OBJ_NEW TYPE STRING,
OBJ_LEAVE TYPE STRING,
OBJ_END TYPE STRING,
OBJ_CHANGE TYPE STRING,
FLG_ENTRY TYPE STRING,
FLG_RETURN TYPE STRING,
FLG_ENQOBJ TYPE STRING,
FLG_FUNCT TYPE STRING,
POPUP TYPE STRING,
TXTTYP TYPE STRING,
FLG_VAR TYPE STRING,
TXTTYPE TYPE STRING,
TXTINGRPH TYPE STRING,
DCU_CHANGE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DMCTL_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_DMCTL_STR-READ_ONLY sy-vline 
WA_DMCTL_STR-LIST_CREAT sy-vline 
WA_DMCTL_STR-LIST_AGAIN sy-vline 
WA_DMCTL_STR-OBJ_DELETE sy-vline 
WA_DMCTL_STR-KEEP_VALUE sy-vline 
WA_DMCTL_STR-EDI_CALLED sy-vline 
WA_DMCTL_STR-OBJ_SAVED sy-vline 
WA_DMCTL_STR-OBJ_NEW sy-vline 
WA_DMCTL_STR-OBJ_LEAVE sy-vline 
WA_DMCTL_STR-OBJ_END sy-vline 
WA_DMCTL_STR-OBJ_CHANGE sy-vline 
WA_DMCTL_STR-FLG_ENTRY sy-vline 
WA_DMCTL_STR-FLG_RETURN sy-vline 
WA_DMCTL_STR-FLG_ENQOBJ sy-vline 
WA_DMCTL_STR-FLG_FUNCT sy-vline 
WA_DMCTL_STR-POPUP sy-vline 
WA_DMCTL_STR-TXTTYP sy-vline 
WA_DMCTL_STR-FLG_VAR sy-vline 
WA_DMCTL_STR-TXTTYPE sy-vline 
WA_DMCTL_STR-TXTINGRPH sy-vline 
WA_DMCTL_STR-DCU_CHANGE sy-vline      INTO ld_text SEPARATED BY SPACE.

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