ABAP Select data from SAP table REXCOTDS_L into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REXCOTDS_L
*  INTO TABLE @DATA(IT_REXCOTDS_L2).
*--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_REXCOTDS_L INDEX 1 INTO DATA(WA_REXCOTDS_L2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REXCOTDS_L>-XIDENTSU = 1.
<REXCOTDS_L>-BUKRS = 1.
<REXCOTDS_L>-GJAHR = 1.
<REXCOTDS_L>-MONAT = 1.
<REXCOTDS_L>-XIDENTCN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REXCOTDS_L-CALCBASE, sy-vline,
  WA_REXCOTDS_L-OTAMOUNT, sy-vline,
  WA_REXCOTDS_L-MEASVALUE, sy-vline,
  WA_REXCOTDS_L-MEASUNIT, sy-vline,
  WA_REXCOTDS_L-TAXTYPE, sy-vline,
  WA_REXCOTDS_L-TAXGROUP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REXCOTDS_L 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_REXCOTDS_L 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_REXCOTDS_L INTO WA_REXCOTDS_L.


*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 GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_REXCOTDS_L-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REXCOTDS_L-GJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEASUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_REXCOTDS_L-MEASUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REXCOTDS_L-MEASUNIT.
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_REXCOTDS_L_STR, 
XIDENTSU TYPE STRING,
BUKRS TYPE STRING,
GJAHR TYPE STRING,
MONAT TYPE STRING,
XIDENTCN TYPE STRING,
CALCBASE TYPE STRING,
OTAMOUNT TYPE STRING,
MEASVALUE TYPE STRING,
MEASUNIT TYPE STRING,
TAXTYPE TYPE STRING,
TAXGROUP TYPE STRING,
OPAMOUNT TYPE STRING,
METHOD TYPE STRING,
CURRENCY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REXCOTDS_L_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_REXCOTDS_L_STR-XIDENTSU sy-vline 
WA_REXCOTDS_L_STR-BUKRS sy-vline 
WA_REXCOTDS_L_STR-GJAHR sy-vline 
WA_REXCOTDS_L_STR-MONAT sy-vline 
WA_REXCOTDS_L_STR-XIDENTCN sy-vline 
WA_REXCOTDS_L_STR-CALCBASE sy-vline 
WA_REXCOTDS_L_STR-OTAMOUNT sy-vline 
WA_REXCOTDS_L_STR-MEASVALUE sy-vline 
WA_REXCOTDS_L_STR-MEASUNIT sy-vline 
WA_REXCOTDS_L_STR-TAXTYPE sy-vline 
WA_REXCOTDS_L_STR-TAXGROUP sy-vline 
WA_REXCOTDS_L_STR-OPAMOUNT sy-vline 
WA_REXCOTDS_L_STR-METHOD sy-vline 
WA_REXCOTDS_L_STR-CURRENCY sy-vline      INTO ld_text SEPARATED BY SPACE.

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