ABAP Select data from SAP table DMC_DOCUKEY into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DMC_DOCUKEY 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_DOCUKEY. 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_DOCUKEY 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_DOCUKEY TYPE STANDARD TABLE OF DMC_DOCUKEY,
      WA_DMC_DOCUKEY TYPE DMC_DOCUKEY,
      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_DOCUKEY> TYPE DMC_DOCUKEY.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DMC_DOCUKEY
*  INTO TABLE @DATA(IT_DMC_DOCUKEY2).
*--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_DOCUKEY INDEX 1 INTO DATA(WA_DMC_DOCUKEY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DMC_DOCUKEY>-A_GUID = 1.
<DMC_DOCUKEY>-A_APPL = 1.
<DMC_DOCUKEY>-P_GUID = 1.
<DMC_DOCUKEY>-P_IDENT = 1.
<DMC_DOCUKEY>-S_GUID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DMC_DOCUKEY-S_IDENT, sy-vline,
  WA_DMC_DOCUKEY-C_GUID, sy-vline,
  WA_DMC_DOCUKEY-C_IDENT, sy-vline,
  WA_DMC_DOCUKEY-O_GUID, sy-vline,
  WA_DMC_DOCUKEY-O_IDENT, sy-vline,
  WA_DMC_DOCUKEY-DOCU_TYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DMC_DOCUKEY 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_DOCUKEY 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_DOCUKEY INTO WA_DMC_DOCUKEY.


*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_DOCUKEY_STR, 
A_GUID TYPE STRING,
A_APPL TYPE STRING,
P_GUID TYPE STRING,
P_IDENT TYPE STRING,
S_GUID TYPE STRING,
S_IDENT TYPE STRING,
C_GUID TYPE STRING,
C_IDENT TYPE STRING,
O_GUID TYPE STRING,
O_IDENT TYPE STRING,
DOCU_TYP TYPE STRING,
DOCU_KEY TYPE STRING,
V_APPL TYPE STRING,
V_PRJCT TYPE STRING,
V_SUBPRO TYPE STRING,
V_COBJ TYPE STRING,
O_PRJCT TYPE STRING,
O_SUBPRO TYPE STRING,
O_COBJ TYPE STRING,
O_RULE TYPE STRING,
O_FIXED TYPE STRING,
O_CNTRL TYPE STRING,
O_TROBJ TYPE STRING,
O_VAR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DMC_DOCUKEY_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_DOCUKEY_STR-A_GUID sy-vline 
WA_DMC_DOCUKEY_STR-A_APPL sy-vline 
WA_DMC_DOCUKEY_STR-P_GUID sy-vline 
WA_DMC_DOCUKEY_STR-P_IDENT sy-vline 
WA_DMC_DOCUKEY_STR-S_GUID sy-vline 
WA_DMC_DOCUKEY_STR-S_IDENT sy-vline 
WA_DMC_DOCUKEY_STR-C_GUID sy-vline 
WA_DMC_DOCUKEY_STR-C_IDENT sy-vline 
WA_DMC_DOCUKEY_STR-O_GUID sy-vline 
WA_DMC_DOCUKEY_STR-O_IDENT sy-vline 
WA_DMC_DOCUKEY_STR-DOCU_TYP sy-vline 
WA_DMC_DOCUKEY_STR-DOCU_KEY sy-vline 
WA_DMC_DOCUKEY_STR-V_APPL sy-vline 
WA_DMC_DOCUKEY_STR-V_PRJCT sy-vline 
WA_DMC_DOCUKEY_STR-V_SUBPRO sy-vline 
WA_DMC_DOCUKEY_STR-V_COBJ sy-vline 
WA_DMC_DOCUKEY_STR-O_PRJCT sy-vline 
WA_DMC_DOCUKEY_STR-O_SUBPRO sy-vline 
WA_DMC_DOCUKEY_STR-O_COBJ sy-vline 
WA_DMC_DOCUKEY_STR-O_RULE sy-vline 
WA_DMC_DOCUKEY_STR-O_FIXED sy-vline 
WA_DMC_DOCUKEY_STR-O_CNTRL sy-vline 
WA_DMC_DOCUKEY_STR-O_TROBJ sy-vline 
WA_DMC_DOCUKEY_STR-O_VAR sy-vline      INTO ld_text SEPARATED BY SPACE.

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