ABAP Select data from SAP table DIO04 into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP DIO04 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 DIO04. 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 DIO04 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_DIO04 TYPE STANDARD TABLE OF DIO04,
      WA_DIO04 TYPE DIO04,
      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: <DIO04> TYPE DIO04.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DIO04.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DIO04
  INTO TABLE IT_DIO04.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DIO04
*  INTO TABLE @DATA(IT_DIO042).
*--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_DIO04 INDEX 1 INTO DATA(WA_DIO042).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DIO04 ASSIGNING <DIO04>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DIO04>-ROLLNAME = 1.
<DIO04>-DDLANGUAGE = 1.
<DIO04>-DOMNAME = 1.
<DIO04>-ROUTPUTLEN = 1.
<DIO04>-MEMORYID = 1.

ENDLOOP.

LOOP AT IT_DIO04 INTO WA_DIO04.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DIO04-LOGFLAG, sy-vline,
  WA_DIO04-HEADLEN, sy-vline,
  WA_DIO04-SCRLEN1, sy-vline,
  WA_DIO04-SCRLEN2, sy-vline,
  WA_DIO04-SCRLEN3, sy-vline,
  WA_DIO04-DDTEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DIO04 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_DIO04 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_DIO04 INTO WA_DIO04.


*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_DIO04_STR, 
ROLLNAME TYPE STRING,
DDLANGUAGE 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,
DDTEXT TYPE STRING,
REPTEXT TYPE STRING,
SCRTEXT_S TYPE STRING,
SCRTEXT_M TYPE STRING,
SCRTEXT_L TYPE STRING,
ACTFLAG TYPE STRING,
APPLCLASS TYPE STRING,
AUTHCLASS TYPE STRING,
AS4USER TYPE STRING,
AS4DATE TYPE STRING,
AS4TIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DIO04_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_DIO04_STR-ROLLNAME sy-vline 
WA_DIO04_STR-DDLANGUAGE sy-vline 
WA_DIO04_STR-DOMNAME sy-vline 
WA_DIO04_STR-ROUTPUTLEN sy-vline 
WA_DIO04_STR-MEMORYID sy-vline 
WA_DIO04_STR-LOGFLAG sy-vline 
WA_DIO04_STR-HEADLEN sy-vline 
WA_DIO04_STR-SCRLEN1 sy-vline 
WA_DIO04_STR-SCRLEN2 sy-vline 
WA_DIO04_STR-SCRLEN3 sy-vline 
WA_DIO04_STR-DDTEXT sy-vline 
WA_DIO04_STR-REPTEXT sy-vline 
WA_DIO04_STR-SCRTEXT_S sy-vline 
WA_DIO04_STR-SCRTEXT_M sy-vline 
WA_DIO04_STR-SCRTEXT_L sy-vline 
WA_DIO04_STR-ACTFLAG sy-vline 
WA_DIO04_STR-APPLCLASS sy-vline 
WA_DIO04_STR-AUTHCLASS sy-vline 
WA_DIO04_STR-AS4USER sy-vline 
WA_DIO04_STR-AS4DATE sy-vline 
WA_DIO04_STR-AS4TIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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