ABAP Select data from SAP table RN2DOKLST into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN2DOKLST 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 RN2DOKLST. 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 RN2DOKLST 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_RN2DOKLST TYPE STANDARD TABLE OF RN2DOKLST,
      WA_RN2DOKLST TYPE RN2DOKLST,
      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: <RN2DOKLST> TYPE RN2DOKLST.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN2DOKLST.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN2DOKLST
  INTO TABLE IT_RN2DOKLST.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN2DOKLST
*  INTO TABLE @DATA(IT_RN2DOKLST2).
*--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_RN2DOKLST INDEX 1 INTO DATA(WA_RN2DOKLST2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN2DOKLST ASSIGNING <RN2DOKLST>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN2DOKLST>-DOKAR = 1.
<RN2DOKLST>-DOKNR = 1.
<RN2DOKLST>-DOKVR = 1.
<RN2DOKLST>-DOKTL = 1.
<RN2DOKLST>-DKTXT = 1.

ENDLOOP.

LOOP AT IT_RN2DOKLST INTO WA_RN2DOKLST.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN2DOKLST-MARK, sy-vline,
  WA_RN2DOKLST-BFLAG, sy-vline,
  WA_RN2DOKLST-LFLAG, sy-vline,
  WA_RN2DOKLST-TFLAG, sy-vline,
  WA_RN2DOKLST-VFLAG, sy-vline,
  WA_RN2DOKLST-DTVERS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN2DOKLST 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_RN2DOKLST 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_RN2DOKLST INTO WA_RN2DOKLST.


*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 DOKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN2DOKLST-DOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN2DOKLST-DOKNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PATNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN2DOKLST-PATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN2DOKLST-PATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN2DOKLST-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN2DOKLST-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LNRLS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN2DOKLST-LNRLS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN2DOKLST-LNRLS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LEIST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN2DOKLST-LEIST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN2DOKLST-LEIST.
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_RN2DOKLST_STR, 
DOKAR TYPE STRING,
DOKNR TYPE STRING,
DOKVR TYPE STRING,
DOKTL TYPE STRING,
DKTXT TYPE STRING,
MARK TYPE STRING,
BFLAG TYPE STRING,
LFLAG TYPE STRING,
TFLAG TYPE STRING,
VFLAG TYPE STRING,
DTVERS TYPE STRING,
DTKB TYPE STRING,
ORGDOKB TYPE STRING,
ORGFKB TYPE STRING,
ORGPKB TYPE STRING,
ORGLEKB TYPE STRING,
ORGLAKB TYPE STRING,
VMAKZ TYPE STRING,
PATNR TYPE STRING,
PNAME TYPE STRING,
FALNR TYPE STRING,
BEWTY TYPE STRING,
BWIDT TYPE STRING,
BWIZT TYPE STRING,
BWATX TYPE STRING,
LNRLS TYPE STRING,
LEIST TYPE STRING,
LSSTAE TYPE STRING,
KTXT1 TYPE STRING,
STABK TYPE STRING,
DODAT TYPE STRING,
DOTIM TYPE STRING,
ERUSR TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
UPUSR TYPE STRING,
UPDAT TYPE STRING,
UPTIM TYPE STRING,
LOEKZ TYPE STRING,
LOUSR TYPE STRING,
LODAT TYPE STRING,
LOTIM TYPE STRING,
BEZEB TYPE STRING,
BEZEBKZ TYPE STRING,
TEXT TYPE STRING,
ICON TYPE STRING,
APPDIS TYPE STRING,
RES1 TYPE STRING,
RES2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN2DOKLST_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_RN2DOKLST_STR-DOKAR sy-vline 
WA_RN2DOKLST_STR-DOKNR sy-vline 
WA_RN2DOKLST_STR-DOKVR sy-vline 
WA_RN2DOKLST_STR-DOKTL sy-vline 
WA_RN2DOKLST_STR-DKTXT sy-vline 
WA_RN2DOKLST_STR-MARK sy-vline 
WA_RN2DOKLST_STR-BFLAG sy-vline 
WA_RN2DOKLST_STR-LFLAG sy-vline 
WA_RN2DOKLST_STR-TFLAG sy-vline 
WA_RN2DOKLST_STR-VFLAG sy-vline 
WA_RN2DOKLST_STR-DTVERS sy-vline 
WA_RN2DOKLST_STR-DTKB sy-vline 
WA_RN2DOKLST_STR-ORGDOKB sy-vline 
WA_RN2DOKLST_STR-ORGFKB sy-vline 
WA_RN2DOKLST_STR-ORGPKB sy-vline 
WA_RN2DOKLST_STR-ORGLEKB sy-vline 
WA_RN2DOKLST_STR-ORGLAKB sy-vline 
WA_RN2DOKLST_STR-VMAKZ sy-vline 
WA_RN2DOKLST_STR-PATNR sy-vline 
WA_RN2DOKLST_STR-PNAME sy-vline 
WA_RN2DOKLST_STR-FALNR sy-vline 
WA_RN2DOKLST_STR-BEWTY sy-vline 
WA_RN2DOKLST_STR-BWIDT sy-vline 
WA_RN2DOKLST_STR-BWIZT sy-vline 
WA_RN2DOKLST_STR-BWATX sy-vline 
WA_RN2DOKLST_STR-LNRLS sy-vline 
WA_RN2DOKLST_STR-LEIST sy-vline 
WA_RN2DOKLST_STR-LSSTAE sy-vline 
WA_RN2DOKLST_STR-KTXT1 sy-vline 
WA_RN2DOKLST_STR-STABK sy-vline 
WA_RN2DOKLST_STR-DODAT sy-vline 
WA_RN2DOKLST_STR-DOTIM sy-vline 
WA_RN2DOKLST_STR-ERUSR sy-vline 
WA_RN2DOKLST_STR-ERDAT sy-vline 
WA_RN2DOKLST_STR-ERTIM sy-vline 
WA_RN2DOKLST_STR-UPUSR sy-vline 
WA_RN2DOKLST_STR-UPDAT sy-vline 
WA_RN2DOKLST_STR-UPTIM sy-vline 
WA_RN2DOKLST_STR-LOEKZ sy-vline 
WA_RN2DOKLST_STR-LOUSR sy-vline 
WA_RN2DOKLST_STR-LODAT sy-vline 
WA_RN2DOKLST_STR-LOTIM sy-vline 
WA_RN2DOKLST_STR-BEZEB sy-vline 
WA_RN2DOKLST_STR-BEZEBKZ sy-vline 
WA_RN2DOKLST_STR-TEXT sy-vline 
WA_RN2DOKLST_STR-ICON sy-vline 
WA_RN2DOKLST_STR-APPDIS sy-vline 
WA_RN2DOKLST_STR-RES1 sy-vline 
WA_RN2DOKLST_STR-RES2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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