ABAP Select data from SAP table DMC_IDOC into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP DMC_IDOC 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_IDOC. 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_IDOC 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_IDOC TYPE STANDARD TABLE OF DMC_IDOC,
      WA_DMC_IDOC TYPE DMC_IDOC,
      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_IDOC> TYPE DMC_IDOC.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DMC_IDOC
*  INTO TABLE @DATA(IT_DMC_IDOC2).
*--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_IDOC INDEX 1 INTO DATA(WA_DMC_IDOC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DMC_IDOC>-GUID = 1.
<DMC_IDOC>-IDOCTYP = 1.
<DMC_IDOC>-CIMTYP = 1.
<DMC_IDOC>-RELEASED = 1.
<DMC_IDOC>-VERSION = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DMC_IDOC-RCONT, sy-vline,
  WA_DMC_IDOC-SCONT, sy-vline,
  WA_DMC_IDOC-CONVOBJ, sy-vline,
  WA_DMC_IDOC-CHNAM, sy-vline,
  WA_DMC_IDOC-AUTHOR, sy-vline,
  WA_DMC_IDOC-CHANGEDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DMC_IDOC 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_IDOC 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_IDOC INTO WA_DMC_IDOC.


*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_IDOC_STR, 
GUID TYPE STRING,
IDOCTYP TYPE STRING,
CIMTYP TYPE STRING,
RELEASED TYPE STRING,
VERSION TYPE STRING,
RCONT TYPE STRING,
SCONT TYPE STRING,
CONVOBJ TYPE STRING,
CHNAM TYPE STRING,
AUTHOR TYPE STRING,
CHANGEDATE TYPE STRING,
CREATEDATE TYPE STRING,
DESCR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DMC_IDOC_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_IDOC_STR-GUID sy-vline 
WA_DMC_IDOC_STR-IDOCTYP sy-vline 
WA_DMC_IDOC_STR-CIMTYP sy-vline 
WA_DMC_IDOC_STR-RELEASED sy-vline 
WA_DMC_IDOC_STR-VERSION sy-vline 
WA_DMC_IDOC_STR-RCONT sy-vline 
WA_DMC_IDOC_STR-SCONT sy-vline 
WA_DMC_IDOC_STR-CONVOBJ sy-vline 
WA_DMC_IDOC_STR-CHNAM sy-vline 
WA_DMC_IDOC_STR-AUTHOR sy-vline 
WA_DMC_IDOC_STR-CHANGEDATE sy-vline 
WA_DMC_IDOC_STR-CREATEDATE sy-vline 
WA_DMC_IDOC_STR-DESCR sy-vline      INTO ld_text SEPARATED BY SPACE.

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