ABAP Select data from SAP table RMCLK into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RMCLK 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 RMCLK. 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 RMCLK 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_RMCLK TYPE STANDARD TABLE OF RMCLK,
      WA_RMCLK TYPE RMCLK,
      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: <RMCLK> TYPE RMCLK.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RMCLK
*  INTO TABLE @DATA(IT_RMCLK2).
*--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_RMCLK INDEX 1 INTO DATA(WA_RMCLK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RMCLK>-OBJEK = 1.
<RMCLK>-MAFID = 1.
<RMCLK>-CLINT = 1.
<RMCLK>-ZAEHL = 1.
<RMCLK>-KSCHL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RMCLK-MARKUPD, sy-vline,
  WA_RMCLK-UPDAT, sy-vline,
  WA_RMCLK-STDCL, sy-vline,
  WA_RMCLK-SICHT, sy-vline,
  WA_RMCLK-LOCK, sy-vline,
  WA_RMCLK-STATU, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RMCLK 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_RMCLK 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_RMCLK INTO WA_RMCLK.


*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_RMCLK_STR, 
OBJEK TYPE STRING,
MAFID TYPE STRING,
CLINT TYPE STRING,
ZAEHL TYPE STRING,
KSCHL TYPE STRING,
MARKUPD TYPE STRING,
UPDAT TYPE STRING,
STDCL TYPE STRING,
SICHT TYPE STRING,
LOCK TYPE STRING,
STATU TYPE STRING,
STATUAEN TYPE STRING,
PRAUS TYPE STRING,
VWSTL TYPE STRING,
CUOBJ TYPE STRING,
OBTAB TYPE STRING,
OBJTYPE TYPE STRING,
INDEX_TAB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RMCLK_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_RMCLK_STR-OBJEK sy-vline 
WA_RMCLK_STR-MAFID sy-vline 
WA_RMCLK_STR-CLINT sy-vline 
WA_RMCLK_STR-ZAEHL sy-vline 
WA_RMCLK_STR-KSCHL sy-vline 
WA_RMCLK_STR-MARKUPD sy-vline 
WA_RMCLK_STR-UPDAT sy-vline 
WA_RMCLK_STR-STDCL sy-vline 
WA_RMCLK_STR-SICHT sy-vline 
WA_RMCLK_STR-LOCK sy-vline 
WA_RMCLK_STR-STATU sy-vline 
WA_RMCLK_STR-STATUAEN sy-vline 
WA_RMCLK_STR-PRAUS sy-vline 
WA_RMCLK_STR-VWSTL sy-vline 
WA_RMCLK_STR-CUOBJ sy-vline 
WA_RMCLK_STR-OBTAB sy-vline 
WA_RMCLK_STR-OBJTYPE sy-vline 
WA_RMCLK_STR-INDEX_TAB sy-vline      INTO ld_text SEPARATED BY SPACE.

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