ABAP Select data from SAP table DDMASS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DDMASS 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 DDMASS. 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 DDMASS 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_DDMASS TYPE STANDARD TABLE OF DDMASS,
      WA_DDMASS TYPE DDMASS,
      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: <DDMASS> TYPE DDMASS.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DDMASS
*  INTO TABLE @DATA(IT_DDMASS2).
*--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_DDMASS INDEX 1 INTO DATA(WA_DDMASS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DDMASS>-TRKORR = 1.
<DDMASS>-EXTTAB = 1.
<DDMASS>-MEDIUM = 1.
<DDMASS>-DDMODE = 1.
<DDMASS>-INACTIVE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DDMASS-AUTHCHK, sy-vline,
  WA_DDMASS-VERSION, sy-vline,
  WA_DDMASS-DELALL, sy-vline,
  WA_DDMASS-DELNOREF, sy-vline,
  WA_DDMASS-NOREPEAT, sy-vline,
  WA_DDMASS-IMPCHK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DDMASS 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_DDMASS 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_DDMASS INTO WA_DDMASS.


*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_DDMASS_STR, 
TRKORR TYPE STRING,
EXTTAB TYPE STRING,
MEDIUM TYPE STRING,
DDMODE TYPE STRING,
INACTIVE TYPE STRING,
AUTHCHK TYPE STRING,
VERSION TYPE STRING,
DELALL TYPE STRING,
DELNOREF TYPE STRING,
NOREPEAT TYPE STRING,
IMPCHK TYPE STRING,
LOGNAME TYPE STRING,
DEVICE TYPE STRING,
WRITE_LOG TYPE STRING,
LOGSHOW TYPE STRING,
TIMER TYPE STRING,
FRCACT TYPE STRING,
ENQUEUE TYPE STRING,
DDDOMALEN TYPE STRING,
DDDTELLEN TYPE STRING,
DDTABLLEN TYPE STRING,
FCT TYPE STRING,
ACTSINGLE TYPE STRING,
EXCOMMIT TYPE STRING,
TEST_ON TYPE STRING,
FOLLOW TYPE STRING,
TABCMP TYPE STRING,
STATPROT TYPE STRING,
PARALLEL TYPE STRING,
MAXTASKS TYPE STRING,
RESPERC TYPE STRING,
PERSIST TYPE STRING,
PERSISTS TYPE STRING,
NOTFILL TYPE STRING,
PARSEL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DDMASS_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_DDMASS_STR-TRKORR sy-vline 
WA_DDMASS_STR-EXTTAB sy-vline 
WA_DDMASS_STR-MEDIUM sy-vline 
WA_DDMASS_STR-DDMODE sy-vline 
WA_DDMASS_STR-INACTIVE sy-vline 
WA_DDMASS_STR-AUTHCHK sy-vline 
WA_DDMASS_STR-VERSION sy-vline 
WA_DDMASS_STR-DELALL sy-vline 
WA_DDMASS_STR-DELNOREF sy-vline 
WA_DDMASS_STR-NOREPEAT sy-vline 
WA_DDMASS_STR-IMPCHK sy-vline 
WA_DDMASS_STR-LOGNAME sy-vline 
WA_DDMASS_STR-DEVICE sy-vline 
WA_DDMASS_STR-WRITE_LOG sy-vline 
WA_DDMASS_STR-LOGSHOW sy-vline 
WA_DDMASS_STR-TIMER sy-vline 
WA_DDMASS_STR-FRCACT sy-vline 
WA_DDMASS_STR-ENQUEUE sy-vline 
WA_DDMASS_STR-DDDOMALEN sy-vline 
WA_DDMASS_STR-DDDTELLEN sy-vline 
WA_DDMASS_STR-DDTABLLEN sy-vline 
WA_DDMASS_STR-FCT sy-vline 
WA_DDMASS_STR-ACTSINGLE sy-vline 
WA_DDMASS_STR-EXCOMMIT sy-vline 
WA_DDMASS_STR-TEST_ON sy-vline 
WA_DDMASS_STR-FOLLOW sy-vline 
WA_DDMASS_STR-TABCMP sy-vline 
WA_DDMASS_STR-STATPROT sy-vline 
WA_DDMASS_STR-PARALLEL sy-vline 
WA_DDMASS_STR-MAXTASKS sy-vline 
WA_DDMASS_STR-RESPERC sy-vline 
WA_DDMASS_STR-PERSIST sy-vline 
WA_DDMASS_STR-PERSISTS sy-vline 
WA_DDMASS_STR-NOTFILL sy-vline 
WA_DDMASS_STR-PARSEL sy-vline      INTO ld_text SEPARATED BY SPACE.

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