ABAP Select data from SAP table DD04L into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DD04L 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 DD04L. 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 DD04L 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_DD04L TYPE STANDARD TABLE OF DD04L,
      WA_DD04L TYPE DD04L,
      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: <DD04L> TYPE DD04L.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DD04L.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DD04L
  INTO TABLE IT_DD04L.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DD04L
*  INTO TABLE @DATA(IT_DD04L2).
*--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_DD04L INDEX 1 INTO DATA(WA_DD04L2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DD04L ASSIGNING <DD04L>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DD04L>-ROLLNAME = 1.
<DD04L>-AS4LOCAL = 1.
<DD04L>-AS4VERS = 1.
<DD04L>-DOMNAME = 1.
<DD04L>-ROUTPUTLEN = 1.

ENDLOOP.

LOOP AT IT_DD04L INTO WA_DD04L.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DD04L-MEMORYID, sy-vline,
  WA_DD04L-LOGFLAG, sy-vline,
  WA_DD04L-HEADLEN, sy-vline,
  WA_DD04L-SCRLEN1, sy-vline,
  WA_DD04L-SCRLEN2, sy-vline,
  WA_DD04L-SCRLEN3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DD04L 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_DD04L 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_DD04L INTO WA_DD04L.


*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 DTELMASTER
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_DD04L-DTELMASTER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DD04L-DTELMASTER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_DD04L-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DD04L-DATATYPE.
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_DD04L_STR, 
ROLLNAME TYPE STRING,
AS4LOCAL TYPE STRING,
AS4VERS 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,
ACTFLAG TYPE STRING,
APPLCLASS TYPE STRING,
AUTHCLASS TYPE STRING,
AS4USER TYPE STRING,
AS4DATE TYPE STRING,
AS4TIME TYPE STRING,
DTELMASTER TYPE STRING,
RESERVEDTE TYPE STRING,
DTELGLOBAL TYPE STRING,
SHLPNAME TYPE STRING,
SHLPFIELD TYPE STRING,
DEFFDNAME TYPE STRING,
DATATYPE TYPE STRING,
LENG TYPE STRING,
DECIMALS TYPE STRING,
OUTPUTLEN TYPE STRING,
LOWERCASE TYPE STRING,
SIGNFLAG TYPE STRING,
CONVEXIT TYPE STRING,
VALEXI TYPE STRING,
ENTITYTAB TYPE STRING,
REFKIND TYPE STRING,
REFTYPE TYPE STRING,
PROXYTYPE TYPE STRING,
LTRFLDDIS TYPE STRING,
BIDICTRLC TYPE STRING,
NOHISTORY TYPE STRING,
ABAP_LANGUAGE_VERSION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DD04L_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_DD04L_STR-ROLLNAME sy-vline 
WA_DD04L_STR-AS4LOCAL sy-vline 
WA_DD04L_STR-AS4VERS sy-vline 
WA_DD04L_STR-DOMNAME sy-vline 
WA_DD04L_STR-ROUTPUTLEN sy-vline 
WA_DD04L_STR-MEMORYID sy-vline 
WA_DD04L_STR-LOGFLAG sy-vline 
WA_DD04L_STR-HEADLEN sy-vline 
WA_DD04L_STR-SCRLEN1 sy-vline 
WA_DD04L_STR-SCRLEN2 sy-vline 
WA_DD04L_STR-SCRLEN3 sy-vline 
WA_DD04L_STR-ACTFLAG sy-vline 
WA_DD04L_STR-APPLCLASS sy-vline 
WA_DD04L_STR-AUTHCLASS sy-vline 
WA_DD04L_STR-AS4USER sy-vline 
WA_DD04L_STR-AS4DATE sy-vline 
WA_DD04L_STR-AS4TIME sy-vline 
WA_DD04L_STR-DTELMASTER sy-vline 
WA_DD04L_STR-RESERVEDTE sy-vline 
WA_DD04L_STR-DTELGLOBAL sy-vline 
WA_DD04L_STR-SHLPNAME sy-vline 
WA_DD04L_STR-SHLPFIELD sy-vline 
WA_DD04L_STR-DEFFDNAME sy-vline 
WA_DD04L_STR-DATATYPE sy-vline 
WA_DD04L_STR-LENG sy-vline 
WA_DD04L_STR-DECIMALS sy-vline 
WA_DD04L_STR-OUTPUTLEN sy-vline 
WA_DD04L_STR-LOWERCASE sy-vline 
WA_DD04L_STR-SIGNFLAG sy-vline 
WA_DD04L_STR-CONVEXIT sy-vline 
WA_DD04L_STR-VALEXI sy-vline 
WA_DD04L_STR-ENTITYTAB sy-vline 
WA_DD04L_STR-REFKIND sy-vline 
WA_DD04L_STR-REFTYPE sy-vline 
WA_DD04L_STR-PROXYTYPE sy-vline 
WA_DD04L_STR-LTRFLDDIS sy-vline 
WA_DD04L_STR-BIDICTRLC sy-vline 
WA_DD04L_STR-NOHISTORY sy-vline 
WA_DD04L_STR-ABAP_LANGUAGE_VERSION sy-vline      INTO ld_text SEPARATED BY SPACE.

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