ABAP Select data from SAP table DMC_ANWDG into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DMC_ANWDG 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_ANWDG. 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_ANWDG 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_ANWDG TYPE STANDARD TABLE OF DMC_ANWDG,
      WA_DMC_ANWDG TYPE DMC_ANWDG,
      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_ANWDG> TYPE DMC_ANWDG.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DMC_ANWDG
*  INTO TABLE @DATA(IT_DMC_ANWDG2).
*--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_ANWDG INDEX 1 INTO DATA(WA_DMC_ANWDG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DMC_ANWDG>-GUID = 1.
<DMC_ANWDG>-APPLIC = 1.
<DMC_ANWDG>-IDENT = 1.
<DMC_ANWDG>-CHNAM = 1.
<DMC_ANWDG>-CHANGEDATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DMC_ANWDG-AUTHOR, sy-vline,
  WA_DMC_ANWDG-CREATEDATE, sy-vline,
  WA_DMC_ANWDG-DESCR, sy-vline,
  WA_DMC_ANWDG-STARTREP, sy-vline,
  WA_DMC_ANWDG-OTITLE, sy-vline,
  WA_DMC_ANWDG-PTRANS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DMC_ANWDG 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_ANWDG 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_ANWDG INTO WA_DMC_ANWDG.


*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_ANWDG_STR, 
GUID TYPE STRING,
APPLIC TYPE STRING,
IDENT TYPE STRING,
CHNAM TYPE STRING,
CHANGEDATE TYPE STRING,
AUTHOR TYPE STRING,
CREATEDATE TYPE STRING,
DESCR TYPE STRING,
STARTREP TYPE STRING,
OTITLE TYPE STRING,
PTRANS TYPE STRING,
BDOCACTIVE TYPE STRING,
MWB_ACCESS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DMC_ANWDG_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_ANWDG_STR-GUID sy-vline 
WA_DMC_ANWDG_STR-APPLIC sy-vline 
WA_DMC_ANWDG_STR-IDENT sy-vline 
WA_DMC_ANWDG_STR-CHNAM sy-vline 
WA_DMC_ANWDG_STR-CHANGEDATE sy-vline 
WA_DMC_ANWDG_STR-AUTHOR sy-vline 
WA_DMC_ANWDG_STR-CREATEDATE sy-vline 
WA_DMC_ANWDG_STR-DESCR sy-vline 
WA_DMC_ANWDG_STR-STARTREP sy-vline 
WA_DMC_ANWDG_STR-OTITLE sy-vline 
WA_DMC_ANWDG_STR-PTRANS sy-vline 
WA_DMC_ANWDG_STR-BDOCACTIVE sy-vline 
WA_DMC_ANWDG_STR-MWB_ACCESS sy-vline      INTO ld_text SEPARATED BY SPACE.

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