ABAP Select data from SAP table DMC_DD02L_EXT_S into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DMC_DD02L_EXT_S 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_DD02L_EXT_S. 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_DD02L_EXT_S 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_DD02L_EXT_S TYPE STANDARD TABLE OF DMC_DD02L_EXT_S,
      WA_DMC_DD02L_EXT_S TYPE DMC_DD02L_EXT_S,
      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_DD02L_EXT_S> TYPE DMC_DD02L_EXT_S.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DMC_DD02L_EXT_S.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DMC_DD02L_EXT_S
  INTO TABLE IT_DMC_DD02L_EXT_S.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DMC_DD02L_EXT_S
*  INTO TABLE @DATA(IT_DMC_DD02L_EXT_S2).
*--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_DD02L_EXT_S INDEX 1 INTO DATA(WA_DMC_DD02L_EXT_S2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DMC_DD02L_EXT_S ASSIGNING <DMC_DD02L_EXT_S>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DMC_DD02L_EXT_S>-ORG_TABNAME = 1.
<DMC_DD02L_EXT_S>-TABNAME = 1.
<DMC_DD02L_EXT_S>-AS4LOCAL = 1.
<DMC_DD02L_EXT_S>-AS4VERS = 1.
<DMC_DD02L_EXT_S>-TABCLASS = 1.

ENDLOOP.

LOOP AT IT_DMC_DD02L_EXT_S INTO WA_DMC_DD02L_EXT_S.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DMC_DD02L_EXT_S-SQLTAB, sy-vline,
  WA_DMC_DD02L_EXT_S-DATMIN, sy-vline,
  WA_DMC_DD02L_EXT_S-DATMAX, sy-vline,
  WA_DMC_DD02L_EXT_S-DATAVG, sy-vline,
  WA_DMC_DD02L_EXT_S-CLIDEP, sy-vline,
  WA_DMC_DD02L_EXT_S-BUFFERED, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DMC_DD02L_EXT_S 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_DD02L_EXT_S 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_DD02L_EXT_S INTO WA_DMC_DD02L_EXT_S.


*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 MASTERLANG
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_DMC_DD02L_EXT_S-MASTERLANG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DMC_DD02L_EXT_S-MASTERLANG.
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_DD02L_EXT_S_STR, 
ORG_TABNAME TYPE STRING,
TABNAME TYPE STRING,
AS4LOCAL TYPE STRING,
AS4VERS TYPE STRING,
TABCLASS TYPE STRING,
SQLTAB TYPE STRING,
DATMIN TYPE STRING,
DATMAX TYPE STRING,
DATAVG TYPE STRING,
CLIDEP TYPE STRING,
BUFFERED TYPE STRING,
COMPRFLAG TYPE STRING,
LANGDEP TYPE STRING,
ACTFLAG TYPE STRING,
APPLCLASS TYPE STRING,
AUTHCLASS TYPE STRING,
AS4USER TYPE STRING,
AS4DATE TYPE STRING,
AS4TIME TYPE STRING,
MASTERLANG TYPE STRING,
MAINFLAG TYPE STRING,
CONTFLAG TYPE STRING,
RESERVETAB TYPE STRING,
GLOBALFLAG TYPE STRING,
PROZPUFF TYPE STRING,
VIEWCLASS TYPE STRING,
VIEWGRANT TYPE STRING,
MULTIPLEX TYPE STRING,
SHLPEXI TYPE STRING,
PROXYTYPE TYPE STRING,
EXCLASS TYPE STRING,
WRONGCL TYPE STRING,
ALWAYSTRP TYPE STRING,
ALLDATAINCL TYPE STRING,
WITH_PARAMETERS TYPE STRING,
EXVIEW_INCLUDED TYPE STRING,
KEYMAX_FEATURE TYPE STRING,
KEYLEN_FEATURE TYPE STRING,
TABLEN_FEATURE TYPE STRING,
NONTRP_INCLUDED TYPE STRING,
VIEWREF TYPE STRING,
VIEWREF_ERR TYPE STRING,
VIEWREF_POS_CHG TYPE STRING,
TBFUNC_INCLUDED TYPE STRING,
IS_GTT TYPE STRING,
SESSION_VAR_EX TYPE STRING,
FROM_ENTITY TYPE STRING,
PK_IS_INVHASH TYPE STRING,
USED_SESSION_VARS TYPE STRING,
ABAP_LANGUAGE_VERSION TYPE STRING,
HDB_ONLY_ENTITY_INCLUDED TYPE STRING,
FIELD_SUFFIX TYPE STRING,
QUOTA_MAX_FIELDS TYPE STRING,
QUOTA_MAX_BYTES TYPE STRING,
QUOTA_SHARE_PARTNER TYPE STRING,
QUOTA_SHARE_CUSTOMER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DMC_DD02L_EXT_S_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_DD02L_EXT_S_STR-ORG_TABNAME sy-vline 
WA_DMC_DD02L_EXT_S_STR-TABNAME sy-vline 
WA_DMC_DD02L_EXT_S_STR-AS4LOCAL sy-vline 
WA_DMC_DD02L_EXT_S_STR-AS4VERS sy-vline 
WA_DMC_DD02L_EXT_S_STR-TABCLASS sy-vline 
WA_DMC_DD02L_EXT_S_STR-SQLTAB sy-vline 
WA_DMC_DD02L_EXT_S_STR-DATMIN sy-vline 
WA_DMC_DD02L_EXT_S_STR-DATMAX sy-vline 
WA_DMC_DD02L_EXT_S_STR-DATAVG sy-vline 
WA_DMC_DD02L_EXT_S_STR-CLIDEP sy-vline 
WA_DMC_DD02L_EXT_S_STR-BUFFERED sy-vline 
WA_DMC_DD02L_EXT_S_STR-COMPRFLAG sy-vline 
WA_DMC_DD02L_EXT_S_STR-LANGDEP sy-vline 
WA_DMC_DD02L_EXT_S_STR-ACTFLAG sy-vline 
WA_DMC_DD02L_EXT_S_STR-APPLCLASS sy-vline 
WA_DMC_DD02L_EXT_S_STR-AUTHCLASS sy-vline 
WA_DMC_DD02L_EXT_S_STR-AS4USER sy-vline 
WA_DMC_DD02L_EXT_S_STR-AS4DATE sy-vline 
WA_DMC_DD02L_EXT_S_STR-AS4TIME sy-vline 
WA_DMC_DD02L_EXT_S_STR-MASTERLANG sy-vline 
WA_DMC_DD02L_EXT_S_STR-MAINFLAG sy-vline 
WA_DMC_DD02L_EXT_S_STR-CONTFLAG sy-vline 
WA_DMC_DD02L_EXT_S_STR-RESERVETAB sy-vline 
WA_DMC_DD02L_EXT_S_STR-GLOBALFLAG sy-vline 
WA_DMC_DD02L_EXT_S_STR-PROZPUFF sy-vline 
WA_DMC_DD02L_EXT_S_STR-VIEWCLASS sy-vline 
WA_DMC_DD02L_EXT_S_STR-VIEWGRANT sy-vline 
WA_DMC_DD02L_EXT_S_STR-MULTIPLEX sy-vline 
WA_DMC_DD02L_EXT_S_STR-SHLPEXI sy-vline 
WA_DMC_DD02L_EXT_S_STR-PROXYTYPE sy-vline 
WA_DMC_DD02L_EXT_S_STR-EXCLASS sy-vline 
WA_DMC_DD02L_EXT_S_STR-WRONGCL sy-vline 
WA_DMC_DD02L_EXT_S_STR-ALWAYSTRP sy-vline 
WA_DMC_DD02L_EXT_S_STR-ALLDATAINCL sy-vline 
WA_DMC_DD02L_EXT_S_STR-WITH_PARAMETERS sy-vline 
WA_DMC_DD02L_EXT_S_STR-EXVIEW_INCLUDED sy-vline 
WA_DMC_DD02L_EXT_S_STR-KEYMAX_FEATURE sy-vline 
WA_DMC_DD02L_EXT_S_STR-KEYLEN_FEATURE sy-vline 
WA_DMC_DD02L_EXT_S_STR-TABLEN_FEATURE sy-vline 
WA_DMC_DD02L_EXT_S_STR-NONTRP_INCLUDED sy-vline 
WA_DMC_DD02L_EXT_S_STR-VIEWREF sy-vline 
WA_DMC_DD02L_EXT_S_STR-VIEWREF_ERR sy-vline 
WA_DMC_DD02L_EXT_S_STR-VIEWREF_POS_CHG sy-vline 
WA_DMC_DD02L_EXT_S_STR-TBFUNC_INCLUDED sy-vline 
WA_DMC_DD02L_EXT_S_STR-IS_GTT sy-vline 
WA_DMC_DD02L_EXT_S_STR-SESSION_VAR_EX sy-vline 
WA_DMC_DD02L_EXT_S_STR-FROM_ENTITY sy-vline 
WA_DMC_DD02L_EXT_S_STR-PK_IS_INVHASH sy-vline 
WA_DMC_DD02L_EXT_S_STR-USED_SESSION_VARS sy-vline 
WA_DMC_DD02L_EXT_S_STR-ABAP_LANGUAGE_VERSION sy-vline 
WA_DMC_DD02L_EXT_S_STR-HDB_ONLY_ENTITY_INCLUDED sy-vline 
WA_DMC_DD02L_EXT_S_STR-FIELD_SUFFIX sy-vline 
WA_DMC_DD02L_EXT_S_STR-QUOTA_MAX_FIELDS sy-vline 
WA_DMC_DD02L_EXT_S_STR-QUOTA_MAX_BYTES sy-vline 
WA_DMC_DD02L_EXT_S_STR-QUOTA_SHARE_PARTNER sy-vline 
WA_DMC_DD02L_EXT_S_STR-QUOTA_SHARE_CUSTOMER sy-vline      INTO ld_text SEPARATED BY SPACE.

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