ABAP Select data from SAP table REBW_RECN_TAB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REBW_RECN_TAB
*  INTO TABLE @DATA(IT_REBW_RECN_TAB2).
*--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_REBW_RECN_TAB INDEX 1 INTO DATA(WA_REBW_RECN_TAB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REBW_RECN_TAB>-BUKRS = 1.
<REBW_RECN_TAB>-RECNNR = 1.
<REBW_RECN_TAB>-RECNBEG = 1.
<REBW_RECN_TAB>-RECNEND = 1.
<REBW_RECN_TAB>-RECNADJT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REBW_RECN_TAB-RECNOBJNR, sy-vline,
  WA_REBW_RECN_TAB-RECNNOTTYPE, sy-vline,
  WA_REBW_RECN_TAB-RECNNOTKEY, sy-vline,
  WA_REBW_RECN_TAB-RECNNOTPER, sy-vline,
  WA_REBW_RECN_TAB-RECNBUSAREA, sy-vline,
  WA_REBW_RECN_TAB-RECNPRCTR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REBW_RECN_TAB 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_REBW_RECN_TAB 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_REBW_RECN_TAB INTO WA_REBW_RECN_TAB.


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

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

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

*Conversion exit ALPHA, internal->external for field RECNKOSTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REBW_RECN_TAB-RECNKOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REBW_RECN_TAB-RECNKOSTL.
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_REBW_RECN_TAB_STR, 
BUKRS TYPE STRING,
RECNNR TYPE STRING,
RECNBEG TYPE STRING,
RECNEND TYPE STRING,
RECNADJT TYPE STRING,
RECNOBJNR TYPE STRING,
RECNNOTTYPE TYPE STRING,
RECNNOTKEY TYPE STRING,
RECNNOTPER TYPE STRING,
RECNBUSAREA TYPE STRING,
RECNPRCTR TYPE STRING,
RECNTLAW TYPE STRING,
RECNNRCOLLECT TYPE STRING,
RECNKOSTL TYPE STRING,
RECNNOTREASON TYPE STRING,
RECNNOTCAT TYPE STRING,
RECNBUKRSCOLLECT TYPE STRING,
INTRENO TYPE STRING,
RECNTYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REBW_RECN_TAB_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_REBW_RECN_TAB_STR-BUKRS sy-vline 
WA_REBW_RECN_TAB_STR-RECNNR sy-vline 
WA_REBW_RECN_TAB_STR-RECNBEG sy-vline 
WA_REBW_RECN_TAB_STR-RECNEND sy-vline 
WA_REBW_RECN_TAB_STR-RECNADJT sy-vline 
WA_REBW_RECN_TAB_STR-RECNOBJNR sy-vline 
WA_REBW_RECN_TAB_STR-RECNNOTTYPE sy-vline 
WA_REBW_RECN_TAB_STR-RECNNOTKEY sy-vline 
WA_REBW_RECN_TAB_STR-RECNNOTPER sy-vline 
WA_REBW_RECN_TAB_STR-RECNBUSAREA sy-vline 
WA_REBW_RECN_TAB_STR-RECNPRCTR sy-vline 
WA_REBW_RECN_TAB_STR-RECNTLAW sy-vline 
WA_REBW_RECN_TAB_STR-RECNNRCOLLECT sy-vline 
WA_REBW_RECN_TAB_STR-RECNKOSTL sy-vline 
WA_REBW_RECN_TAB_STR-RECNNOTREASON sy-vline 
WA_REBW_RECN_TAB_STR-RECNNOTCAT sy-vline 
WA_REBW_RECN_TAB_STR-RECNBUKRSCOLLECT sy-vline 
WA_REBW_RECN_TAB_STR-INTRENO sy-vline 
WA_REBW_RECN_TAB_STR-RECNTYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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