ABAP Select data from SAP table DIACL_CLIST into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DIACL_CLIST 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_CLIST. 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_CLIST 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_CLIST TYPE STANDARD TABLE OF DIACL_CLIST,
      WA_DIACL_CLIST TYPE DIACL_CLIST,
      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_CLIST> TYPE DIACL_CLIST.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DIACL_CLIST
*  INTO TABLE @DATA(IT_DIACL_CLIST2).
*--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_CLIST INDEX 1 INTO DATA(WA_DIACL_CLIST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DIACL_CLIST>-MANDT = 1.
<DIACL_CLIST>-RSNUM = 1.
<DIACL_CLIST>-RSPOS = 1.
<DIACL_CLIST>-RSART = 1.
<DIACL_CLIST>-SERNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DIACL_CLIST-SEQUNR, sy-vline,
  WA_DIACL_CLIST-STPLNR, sy-vline,
  WA_DIACL_CLIST-SPOSNR, sy-vline,
  WA_DIACL_CLIST-EVENT, sy-vline,
  WA_DIACL_CLIST-COND, sy-vline,
  WA_DIACL_CLIST-NOTIF_TXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DIACL_CLIST 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_CLIST 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_CLIST INTO WA_DIACL_CLIST.


*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 GERNR, internal->external for field SERNR
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_DIACL_CLIST-SERNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIACL_CLIST-SERNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit TPLNR, internal->external for field STPLNR
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_DIACL_CLIST-STPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIACL_CLIST-STPLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EQUNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DIACL_CLIST-EQUNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIACL_CLIST-EQUNR.
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_CLIST_STR, 
MANDT TYPE STRING,
RSNUM TYPE STRING,
RSPOS TYPE STRING,
RSART TYPE STRING,
SERNR TYPE STRING,
SEQUNR TYPE STRING,
STPLNR TYPE STRING,
SPOSNR TYPE STRING,
EVENT TYPE STRING,
COND TYPE STRING,
NOTIF_TXT TYPE STRING,
EQUNR TYPE STRING,
P_DATE TYPE STRING,
P_TIME TYPE STRING,
P_ZONE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DIACL_CLIST_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_CLIST_STR-MANDT sy-vline 
WA_DIACL_CLIST_STR-RSNUM sy-vline 
WA_DIACL_CLIST_STR-RSPOS sy-vline 
WA_DIACL_CLIST_STR-RSART sy-vline 
WA_DIACL_CLIST_STR-SERNR sy-vline 
WA_DIACL_CLIST_STR-SEQUNR sy-vline 
WA_DIACL_CLIST_STR-STPLNR sy-vline 
WA_DIACL_CLIST_STR-SPOSNR sy-vline 
WA_DIACL_CLIST_STR-EVENT sy-vline 
WA_DIACL_CLIST_STR-COND sy-vline 
WA_DIACL_CLIST_STR-NOTIF_TXT sy-vline 
WA_DIACL_CLIST_STR-EQUNR sy-vline 
WA_DIACL_CLIST_STR-P_DATE sy-vline 
WA_DIACL_CLIST_STR-P_TIME sy-vline 
WA_DIACL_CLIST_STR-P_ZONE sy-vline      INTO ld_text SEPARATED BY SPACE.

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