ABAP Select data from SAP table DIACL_OPERATION_DS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DIACL_OPERATION_DS
*  INTO TABLE @DATA(IT_DIACL_OPERATION_DS2).
*--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_DIACL_OPERATION_DS INDEX 1 INTO DATA(WA_DIACL_OPERATION_DS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DIACL_OPERATION_DS>-AUFNRD = 1.
<DIACL_OPERATION_DS>-VORNR = 1.
<DIACL_OPERATION_DS>-LONGT = 1.
<DIACL_OPERATION_DS>-LTXA1 = 1.
<DIACL_OPERATION_DS>-ARBPL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DIACL_OPERATION_DS-WERKS, sy-vline,
  WA_DIACL_OPERATION_DS-LARNT, sy-vline,
  WA_DIACL_OPERATION_DS-STEUS, sy-vline,
  WA_DIACL_OPERATION_DS-DAUNO, sy-vline,
  WA_DIACL_OPERATION_DS-DAUNE, sy-vline,
  WA_DIACL_OPERATION_DS-ARBEI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DIACL_OPERATION_DS 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_DIACL_OPERATION_DS 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_DIACL_OPERATION_DS INTO WA_DIACL_OPERATION_DS.


*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 ALPHA, internal->external for field AUFNRD
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DIACL_OPERATION_DS-AUFNRD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIACL_OPERATION_DS-AUFNRD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_DIACL_OPERATION_DS-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIACL_OPERATION_DS-VORNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field DAUNE
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_DIACL_OPERATION_DS-DAUNE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIACL_OPERATION_DS-DAUNE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ARBEH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_DIACL_OPERATION_DS-ARBEH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIACL_OPERATION_DS-ARBEH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ISMNE
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_DIACL_OPERATION_DS-ISMNE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIACL_OPERATION_DS-ISMNE.
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_DIACL_OPERATION_DS_STR, 
AUFNRD TYPE STRING,
VORNR TYPE STRING,
LONGT TYPE STRING,
LTXA1 TYPE STRING,
ARBPL TYPE STRING,
WERKS TYPE STRING,
LARNT TYPE STRING,
STEUS TYPE STRING,
DAUNO TYPE STRING,
DAUNE TYPE STRING,
ARBEI TYPE STRING,
ARBEH TYPE STRING,
VSTTXT TYPE STRING,
DCERT TYPE STRING,
ISMNW TYPE STRING,
ISMNE TYPE STRING,
AUERU TYPE STRING,
CELLTAB TYPE STRING,
OPERATION TYPE STRING,
TEC_STATUS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DIACL_OPERATION_DS_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_DIACL_OPERATION_DS_STR-AUFNRD sy-vline 
WA_DIACL_OPERATION_DS_STR-VORNR sy-vline 
WA_DIACL_OPERATION_DS_STR-LONGT sy-vline 
WA_DIACL_OPERATION_DS_STR-LTXA1 sy-vline 
WA_DIACL_OPERATION_DS_STR-ARBPL sy-vline 
WA_DIACL_OPERATION_DS_STR-WERKS sy-vline 
WA_DIACL_OPERATION_DS_STR-LARNT sy-vline 
WA_DIACL_OPERATION_DS_STR-STEUS sy-vline 
WA_DIACL_OPERATION_DS_STR-DAUNO sy-vline 
WA_DIACL_OPERATION_DS_STR-DAUNE sy-vline 
WA_DIACL_OPERATION_DS_STR-ARBEI sy-vline 
WA_DIACL_OPERATION_DS_STR-ARBEH sy-vline 
WA_DIACL_OPERATION_DS_STR-VSTTXT sy-vline 
WA_DIACL_OPERATION_DS_STR-DCERT sy-vline 
WA_DIACL_OPERATION_DS_STR-ISMNW sy-vline 
WA_DIACL_OPERATION_DS_STR-ISMNE sy-vline 
WA_DIACL_OPERATION_DS_STR-AUERU sy-vline 
WA_DIACL_OPERATION_DS_STR-CELLTAB sy-vline 
WA_DIACL_OPERATION_DS_STR-OPERATION sy-vline 
WA_DIACL_OPERATION_DS_STR-TEC_STATUS sy-vline      INTO ld_text SEPARATED BY SPACE.

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