ABAP Select data from SAP table SIMACTRL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SIMACTRL
*  INTO TABLE @DATA(IT_SIMACTRL2).
*--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_SIMACTRL INDEX 1 INTO DATA(WA_SIMACTRL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SIMACTRL>-AKTDB = 1.
<SIMACTRL>-AKTYP = 1.
<SIMACTRL>-XCHNG = 1.
<SIMACTRL>-NRRNG = 1.
<SIMACTRL>-XNREX = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SIMACTRL-VALDT, sy-vline,
  WA_SIMACTRL-DUMMYNUMBER, sy-vline,
  WA_SIMACTRL-XENQUEUE, sy-vline,
  WA_SIMACTRL-XUPDTASK, sy-vline,
  WA_SIMACTRL-XCHDOC, sy-vline,
  WA_SIMACTRL-XDINP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SIMACTRL 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_SIMACTRL 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_SIMACTRL INTO WA_SIMACTRL.


*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 DUMMYNUMBER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_SIMACTRL-DUMMYNUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_SIMACTRL-DUMMYNUMBER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PCHNGNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_SIMACTRL-PCHNGNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_SIMACTRL-PCHNGNR.
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_SIMACTRL_STR, 
AKTDB TYPE STRING,
AKTYP TYPE STRING,
XCHNG TYPE STRING,
NRRNG TYPE STRING,
XNREX TYPE STRING,
VALDT TYPE STRING,
DUMMYNUMBER TYPE STRING,
XENQUEUE TYPE STRING,
XUPDTASK TYPE STRING,
XCHDOC TYPE STRING,
XDINP TYPE STRING,
XREADPP TYPE STRING,
XPOSTTRANSFER TYPE STRING,
XSAVED TYPE STRING,
XTEST TYPE STRING,
RUNDT TYPE STRING,
PCHNGNR TYPE STRING,
TPCDHDR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SIMACTRL_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_SIMACTRL_STR-AKTDB sy-vline 
WA_SIMACTRL_STR-AKTYP sy-vline 
WA_SIMACTRL_STR-XCHNG sy-vline 
WA_SIMACTRL_STR-NRRNG sy-vline 
WA_SIMACTRL_STR-XNREX sy-vline 
WA_SIMACTRL_STR-VALDT sy-vline 
WA_SIMACTRL_STR-DUMMYNUMBER sy-vline 
WA_SIMACTRL_STR-XENQUEUE sy-vline 
WA_SIMACTRL_STR-XUPDTASK sy-vline 
WA_SIMACTRL_STR-XCHDOC sy-vline 
WA_SIMACTRL_STR-XDINP sy-vline 
WA_SIMACTRL_STR-XREADPP sy-vline 
WA_SIMACTRL_STR-XPOSTTRANSFER sy-vline 
WA_SIMACTRL_STR-XSAVED sy-vline 
WA_SIMACTRL_STR-XTEST sy-vline 
WA_SIMACTRL_STR-RUNDT sy-vline 
WA_SIMACTRL_STR-PCHNGNR sy-vline 
WA_SIMACTRL_STR-TPCDHDR sy-vline      INTO ld_text SEPARATED BY SPACE.

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