ABAP Select data from SAP table DMC_DD03P_30 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DMC_DD03P_30 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_DD03P_30. 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_DD03P_30 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_DD03P_30 TYPE STANDARD TABLE OF DMC_DD03P_30,
      WA_DMC_DD03P_30 TYPE DMC_DD03P_30,
      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_DD03P_30> TYPE DMC_DD03P_30.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DMC_DD03P_30.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DMC_DD03P_30
  INTO TABLE IT_DMC_DD03P_30.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DMC_DD03P_30
*  INTO TABLE @DATA(IT_DMC_DD03P_302).
*--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_DD03P_30 INDEX 1 INTO DATA(WA_DMC_DD03P_302).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DMC_DD03P_30 ASSIGNING <DMC_DD03P_30>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DMC_DD03P_30>-TABNAME = 1.
<DMC_DD03P_30>-FIELDNAME = 1.
<DMC_DD03P_30>-DDLANGUAGE = 1.
<DMC_DD03P_30>-POSITION = 1.
<DMC_DD03P_30>-KEYFLAG = 1.

ENDLOOP.

LOOP AT IT_DMC_DD03P_30 INTO WA_DMC_DD03P_30.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DMC_DD03P_30-MANDATORY, sy-vline,
  WA_DMC_DD03P_30-ROLLNAME, sy-vline,
  WA_DMC_DD03P_30-CHECKTABLE, sy-vline,
  WA_DMC_DD03P_30-ADMINFIELD, sy-vline,
  WA_DMC_DD03P_30-INTTYPE, sy-vline,
  WA_DMC_DD03P_30-INTLEN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DMC_DD03P_30 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_DD03P_30 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_DD03P_30 INTO WA_DMC_DD03P_30.


*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.

*Conversion exit ISOLA, internal->external for field DDLANGUAGE
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_DMC_DD03P_30-DDLANGUAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DMC_DD03P_30-DDLANGUAGE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field DTELMASTER
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_DMC_DD03P_30-DTELMASTER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DMC_DD03P_30-DTELMASTER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field DOMMASTER
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_DMC_DD03P_30-DOMMASTER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DMC_DD03P_30-DOMMASTER.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_DMC_DD03P_30_STR, 
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
DDLANGUAGE TYPE STRING,
POSITION TYPE STRING,
KEYFLAG TYPE STRING,
MANDATORY TYPE STRING,
ROLLNAME TYPE STRING,
CHECKTABLE TYPE STRING,
ADMINFIELD TYPE STRING,
INTTYPE TYPE STRING,
INTLEN TYPE STRING,
REFTABLE TYPE STRING,
PRECFIELD TYPE STRING,
REFFIELD TYPE STRING,
CONROUT TYPE STRING,
NOTNULL TYPE STRING,
DOMNAME TYPE STRING,
ROUTPUTLEN TYPE STRING,
MEMORYID TYPE STRING,
LOGFLAG TYPE STRING,
HEADLEN TYPE STRING,
SCRLEN1 TYPE STRING,
SCRLEN2 TYPE STRING,
SCRLEN3 TYPE STRING,
DTELGLOBAL TYPE STRING,
DTELMASTER TYPE STRING,
RESERVEDTE TYPE STRING,
DATATYPE TYPE STRING,
LENG TYPE STRING,
OUTPUTLEN TYPE STRING,
DECIMALS TYPE STRING,
LOWERCASE TYPE STRING,
SIGNFLAG TYPE STRING,
LANGFLAG TYPE STRING,
VALEXI TYPE STRING,
ENTITYTAB TYPE STRING,
CONVEXIT TYPE STRING,
MASK TYPE STRING,
MASKLEN TYPE STRING,
ACTFLAG TYPE STRING,
DDTEXT TYPE STRING,
REPTEXT TYPE STRING,
SCRTEXT_S TYPE STRING,
SCRTEXT_M TYPE STRING,
SCRTEXT_L TYPE STRING,
DOMMASTER TYPE STRING,
RESERVEDOM TYPE STRING,
DOMGLOBAL TYPE STRING,
DOMNAME3L TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DMC_DD03P_30_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_DD03P_30_STR-TABNAME sy-vline 
WA_DMC_DD03P_30_STR-FIELDNAME sy-vline 
WA_DMC_DD03P_30_STR-DDLANGUAGE sy-vline 
WA_DMC_DD03P_30_STR-POSITION sy-vline 
WA_DMC_DD03P_30_STR-KEYFLAG sy-vline 
WA_DMC_DD03P_30_STR-MANDATORY sy-vline 
WA_DMC_DD03P_30_STR-ROLLNAME sy-vline 
WA_DMC_DD03P_30_STR-CHECKTABLE sy-vline 
WA_DMC_DD03P_30_STR-ADMINFIELD sy-vline 
WA_DMC_DD03P_30_STR-INTTYPE sy-vline 
WA_DMC_DD03P_30_STR-INTLEN sy-vline 
WA_DMC_DD03P_30_STR-REFTABLE sy-vline 
WA_DMC_DD03P_30_STR-PRECFIELD sy-vline 
WA_DMC_DD03P_30_STR-REFFIELD sy-vline 
WA_DMC_DD03P_30_STR-CONROUT sy-vline 
WA_DMC_DD03P_30_STR-NOTNULL sy-vline 
WA_DMC_DD03P_30_STR-DOMNAME sy-vline 
WA_DMC_DD03P_30_STR-ROUTPUTLEN sy-vline 
WA_DMC_DD03P_30_STR-MEMORYID sy-vline 
WA_DMC_DD03P_30_STR-LOGFLAG sy-vline 
WA_DMC_DD03P_30_STR-HEADLEN sy-vline 
WA_DMC_DD03P_30_STR-SCRLEN1 sy-vline 
WA_DMC_DD03P_30_STR-SCRLEN2 sy-vline 
WA_DMC_DD03P_30_STR-SCRLEN3 sy-vline 
WA_DMC_DD03P_30_STR-DTELGLOBAL sy-vline 
WA_DMC_DD03P_30_STR-DTELMASTER sy-vline 
WA_DMC_DD03P_30_STR-RESERVEDTE sy-vline 
WA_DMC_DD03P_30_STR-DATATYPE sy-vline 
WA_DMC_DD03P_30_STR-LENG sy-vline 
WA_DMC_DD03P_30_STR-OUTPUTLEN sy-vline 
WA_DMC_DD03P_30_STR-DECIMALS sy-vline 
WA_DMC_DD03P_30_STR-LOWERCASE sy-vline 
WA_DMC_DD03P_30_STR-SIGNFLAG sy-vline 
WA_DMC_DD03P_30_STR-LANGFLAG sy-vline 
WA_DMC_DD03P_30_STR-VALEXI sy-vline 
WA_DMC_DD03P_30_STR-ENTITYTAB sy-vline 
WA_DMC_DD03P_30_STR-CONVEXIT sy-vline 
WA_DMC_DD03P_30_STR-MASK sy-vline 
WA_DMC_DD03P_30_STR-MASKLEN sy-vline 
WA_DMC_DD03P_30_STR-ACTFLAG sy-vline 
WA_DMC_DD03P_30_STR-DDTEXT sy-vline 
WA_DMC_DD03P_30_STR-REPTEXT sy-vline 
WA_DMC_DD03P_30_STR-SCRTEXT_S sy-vline 
WA_DMC_DD03P_30_STR-SCRTEXT_M sy-vline 
WA_DMC_DD03P_30_STR-SCRTEXT_L sy-vline 
WA_DMC_DD03P_30_STR-DOMMASTER sy-vline 
WA_DMC_DD03P_30_STR-RESERVEDOM sy-vline 
WA_DMC_DD03P_30_STR-DOMGLOBAL sy-vline 
WA_DMC_DD03P_30_STR-DOMNAME3L sy-vline      INTO ld_text SEPARATED BY SPACE.

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