ABAP Select data from SAP table RCLST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCLST
*  INTO TABLE @DATA(IT_RCLST2).
*--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_RCLST INDEX 1 INTO DATA(WA_RCLST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCLST>-LSTNR = 1.
<RCLST>-SORT = 1.
<RCLST>-OBJECT = 1.
<RCLST>-SUBOBJ = 1.
<RCLST>-INDEX_PLKO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCLST-INDEX_PLFL, sy-vline,
  WA_RCLST-INDEX_PLAS, sy-vline,
  WA_RCLST-INDEX_PLPO, sy-vline,
  WA_RCLST-INDEX_SOPR, sy-vline,
  WA_RCLST-INDEX_PLAB, sy-vline,
  WA_RCLST-INDEX_PLTX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCLST 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_RCLST 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_RCLST INTO WA_RCLST.


*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_RCLST_STR, 
LSTNR TYPE STRING,
SORT TYPE STRING,
OBJECT TYPE STRING,
SUBOBJ TYPE STRING,
INDEX_PLKO TYPE STRING,
INDEX_PLFL TYPE STRING,
INDEX_PLAS TYPE STRING,
INDEX_PLPO TYPE STRING,
INDEX_SOPR TYPE STRING,
INDEX_PLAB TYPE STRING,
INDEX_PLTX TYPE STRING,
INDEX_PLMZ TYPE STRING,
INDEX_FLRE TYPE STRING,
INDEX_KORE TYPE STRING,
INDEX_POVW TYPE STRING,
INDEX_ASVW TYPE STRING,
INDEX_PLFH TYPE STRING,
INDEX_PLMK TYPE STRING,
INDEX_PLMW TYPE STRING,
INDEX_PLWP TYPE STRING,
INDEX_APOS TYPE STRING,
INDEX_KBED TYPE STRING,
INDEX_SKBD TYPE STRING,
INDEX_PLPH TYPE STRING,
INDEX_MLST TYPE STRING,
INDEX_SNET TYPE STRING,
INDEX_PLFT TYPE STRING,
INDEX_PLFV TYPE STRING,
DATUB TYPE STRING,
FLG_VERW TYPE STRING,
VPLNKN TYPE STRING,
FLG_REF TYPE STRING,
FLG_MARK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCLST_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_RCLST_STR-LSTNR sy-vline 
WA_RCLST_STR-SORT sy-vline 
WA_RCLST_STR-OBJECT sy-vline 
WA_RCLST_STR-SUBOBJ sy-vline 
WA_RCLST_STR-INDEX_PLKO sy-vline 
WA_RCLST_STR-INDEX_PLFL sy-vline 
WA_RCLST_STR-INDEX_PLAS sy-vline 
WA_RCLST_STR-INDEX_PLPO sy-vline 
WA_RCLST_STR-INDEX_SOPR sy-vline 
WA_RCLST_STR-INDEX_PLAB sy-vline 
WA_RCLST_STR-INDEX_PLTX sy-vline 
WA_RCLST_STR-INDEX_PLMZ sy-vline 
WA_RCLST_STR-INDEX_FLRE sy-vline 
WA_RCLST_STR-INDEX_KORE sy-vline 
WA_RCLST_STR-INDEX_POVW sy-vline 
WA_RCLST_STR-INDEX_ASVW sy-vline 
WA_RCLST_STR-INDEX_PLFH sy-vline 
WA_RCLST_STR-INDEX_PLMK sy-vline 
WA_RCLST_STR-INDEX_PLMW sy-vline 
WA_RCLST_STR-INDEX_PLWP sy-vline 
WA_RCLST_STR-INDEX_APOS sy-vline 
WA_RCLST_STR-INDEX_KBED sy-vline 
WA_RCLST_STR-INDEX_SKBD sy-vline 
WA_RCLST_STR-INDEX_PLPH sy-vline 
WA_RCLST_STR-INDEX_MLST sy-vline 
WA_RCLST_STR-INDEX_SNET sy-vline 
WA_RCLST_STR-INDEX_PLFT sy-vline 
WA_RCLST_STR-INDEX_PLFV sy-vline 
WA_RCLST_STR-DATUB sy-vline 
WA_RCLST_STR-FLG_VERW sy-vline 
WA_RCLST_STR-VPLNKN sy-vline 
WA_RCLST_STR-FLG_REF sy-vline 
WA_RCLST_STR-FLG_MARK sy-vline      INTO ld_text SEPARATED BY SPACE.

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