ABAP Select data from SAP table RNC301S into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNC301S 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 RNC301S. 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 RNC301S 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_RNC301S TYPE STANDARD TABLE OF RNC301S,
      WA_RNC301S TYPE RNC301S,
      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: <RNC301S> TYPE RNC301S.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNC301S.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNC301S
  INTO TABLE IT_RNC301S.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNC301S
*  INTO TABLE @DATA(IT_RNC301S2).
*--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_RNC301S INDEX 1 INTO DATA(WA_RNC301S2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNC301S ASSIGNING <RNC301S>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNC301S>-EINRI = 1.
<RNC301S>-FALNR = 1.
<RNC301S>-LFDNR = 1.
<RNC301S>-KOSTR = 1.
<RNC301S>-INSTN = 1.

ENDLOOP.

LOOP AT IT_RNC301S INTO WA_RNC301S.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNC301S-DAS301, sy-vline,
  WA_RNC301S-STAND, sy-vline,
  WA_RNC301S-STVER, sy-vline,
  WA_RNC301S-DS301, sy-vline,
  WA_RNC301S-LFDVORFALL, sy-vline,
  WA_RNC301S-APPLK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNC301S 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_RNC301S 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_RNC301S INTO WA_RNC301S.


*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 EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNC301S-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNC301S-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNC301S-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNC301S-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNC301S-KOSTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNC301S-KOSTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field INSTN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNC301S-INSTN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNC301S-INSTN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LF301D
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNC301S-LF301D
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNC301S-LF301D.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field NOINFILE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNC301S-NOINFILE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNC301S-NOINFILE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EXTKEY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNC301S-EXTKEY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNC301S-EXTKEY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LF301REF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNC301S-LF301REF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNC301S-LF301REF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field GRPNOINFILE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNC301S-GRPNOINFILE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNC301S-GRPNOINFILE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PATNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNC301S-PATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNC301S-PATNR.
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_RNC301S_STR, 
EINRI TYPE STRING,
FALNR TYPE STRING,
LFDNR TYPE STRING,
KOSTR TYPE STRING,
INSTN TYPE STRING,
DAS301 TYPE STRING,
STAND TYPE STRING,
STVER TYPE STRING,
DS301 TYPE STRING,
LFDVORFALL TYPE STRING,
APPLK TYPE STRING,
EVENT TYPE STRING,
KEY1 TYPE STRING,
KEY2 TYPE STRING,
KEY3 TYPE STRING,
KEY4 TYPE STRING,
KEY5 TYPE STRING,
KEY6 TYPE STRING,
SESTA TYPE STRING,
SEDAT TYPE STRING,
SETIM TYPE STRING,
NINOUTSIGN TYPE STRING,
LF301M TYPE STRING,
LF301D TYPE STRING,
NOINFILE TYPE STRING,
SIPROC TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPTIM TYPE STRING,
UPUSR TYPE STRING,
RSTATUS TYPE STRING,
EDIPROC TYPE STRING,
SENDUNTIL TYPE STRING,
NTNR TYPE STRING,
APSTATE TYPE STRING,
DCSTATE TYPE STRING,
EXTKEY TYPE STRING,
LF301REF TYPE STRING,
HOLDDT TYPE STRING,
GRPNOINFILE TYPE STRING,
PATNR TYPE STRING,
EXTNR TYPE STRING,
INDIC1 TYPE STRING,
INDIC2 TYPE STRING,
INDIC3 TYPE STRING,
VISITNR TYPE STRING,
MRELCTRL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNC301S_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_RNC301S_STR-EINRI sy-vline 
WA_RNC301S_STR-FALNR sy-vline 
WA_RNC301S_STR-LFDNR sy-vline 
WA_RNC301S_STR-KOSTR sy-vline 
WA_RNC301S_STR-INSTN sy-vline 
WA_RNC301S_STR-DAS301 sy-vline 
WA_RNC301S_STR-STAND sy-vline 
WA_RNC301S_STR-STVER sy-vline 
WA_RNC301S_STR-DS301 sy-vline 
WA_RNC301S_STR-LFDVORFALL sy-vline 
WA_RNC301S_STR-APPLK sy-vline 
WA_RNC301S_STR-EVENT sy-vline 
WA_RNC301S_STR-KEY1 sy-vline 
WA_RNC301S_STR-KEY2 sy-vline 
WA_RNC301S_STR-KEY3 sy-vline 
WA_RNC301S_STR-KEY4 sy-vline 
WA_RNC301S_STR-KEY5 sy-vline 
WA_RNC301S_STR-KEY6 sy-vline 
WA_RNC301S_STR-SESTA sy-vline 
WA_RNC301S_STR-SEDAT sy-vline 
WA_RNC301S_STR-SETIM sy-vline 
WA_RNC301S_STR-NINOUTSIGN sy-vline 
WA_RNC301S_STR-LF301M sy-vline 
WA_RNC301S_STR-LF301D sy-vline 
WA_RNC301S_STR-NOINFILE sy-vline 
WA_RNC301S_STR-SIPROC sy-vline 
WA_RNC301S_STR-ERDAT sy-vline 
WA_RNC301S_STR-ERTIM sy-vline 
WA_RNC301S_STR-ERUSR sy-vline 
WA_RNC301S_STR-UPDAT sy-vline 
WA_RNC301S_STR-UPTIM sy-vline 
WA_RNC301S_STR-UPUSR sy-vline 
WA_RNC301S_STR-RSTATUS sy-vline 
WA_RNC301S_STR-EDIPROC sy-vline 
WA_RNC301S_STR-SENDUNTIL sy-vline 
WA_RNC301S_STR-NTNR sy-vline 
WA_RNC301S_STR-APSTATE sy-vline 
WA_RNC301S_STR-DCSTATE sy-vline 
WA_RNC301S_STR-EXTKEY sy-vline 
WA_RNC301S_STR-LF301REF sy-vline 
WA_RNC301S_STR-HOLDDT sy-vline 
WA_RNC301S_STR-GRPNOINFILE sy-vline 
WA_RNC301S_STR-PATNR sy-vline 
WA_RNC301S_STR-EXTNR sy-vline 
WA_RNC301S_STR-INDIC1 sy-vline 
WA_RNC301S_STR-INDIC2 sy-vline 
WA_RNC301S_STR-INDIC3 sy-vline 
WA_RNC301S_STR-VISITNR sy-vline 
WA_RNC301S_STR-MRELCTRL sy-vline      INTO ld_text SEPARATED BY SPACE.

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