ABAP Select data from SAP table RN1IS1 into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN1IS1 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 RN1IS1. 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 RN1IS1 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_RN1IS1 TYPE STANDARD TABLE OF RN1IS1,
      WA_RN1IS1 TYPE RN1IS1,
      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: <RN1IS1> TYPE RN1IS1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN1IS1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN1IS1
  INTO TABLE IT_RN1IS1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN1IS1
*  INTO TABLE @DATA(IT_RN1IS12).
*--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_RN1IS1 INDEX 1 INTO DATA(WA_RN1IS12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN1IS1 ASSIGNING <RN1IS1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN1IS1>-EINRI = 1.
<RN1IS1>-EINRITXT = 1.
<RN1IS1>-STARTDATE = 1.
<RN1IS1>-CSTARTDATE = 1.
<RN1IS1>-MON_AM = 1.

ENDLOOP.

LOOP AT IT_RN1IS1 INTO WA_RN1IS1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN1IS1-MON_PM, sy-vline,
  WA_RN1IS1-TUE_AM, sy-vline,
  WA_RN1IS1-TUE_PM, sy-vline,
  WA_RN1IS1-WED_AM, sy-vline,
  WA_RN1IS1-WED_PM, sy-vline,
  WA_RN1IS1-THU_AM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN1IS1 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_RN1IS1 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_RN1IS1 INTO WA_RN1IS1.


*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_RN1IS1-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1IS1-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PATNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN1IS1-PATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1IS1-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_RN1IS1_STR, 
EINRI TYPE STRING,
EINRITXT TYPE STRING,
STARTDATE TYPE STRING,
CSTARTDATE TYPE STRING,
MON_AM TYPE STRING,
MON_PM TYPE STRING,
TUE_AM TYPE STRING,
TUE_PM TYPE STRING,
WED_AM TYPE STRING,
WED_PM TYPE STRING,
THU_AM TYPE STRING,
THU_PM TYPE STRING,
FRI_AM TYPE STRING,
FRI_PM TYPE STRING,
VKG_NO TYPE STRING,
LEIST_NO TYPE STRING,
GROUP_SRV_NO TYPE STRING,
APP_NO TYPE STRING,
NNAME TYPE STRING,
VNAME TYPE STRING,
GBDAT TYPE STRING,
GSCHL TYPE STRING,
GSCHLE TYPE STRING,
PATNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN1IS1_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_RN1IS1_STR-EINRI sy-vline 
WA_RN1IS1_STR-EINRITXT sy-vline 
WA_RN1IS1_STR-STARTDATE sy-vline 
WA_RN1IS1_STR-CSTARTDATE sy-vline 
WA_RN1IS1_STR-MON_AM sy-vline 
WA_RN1IS1_STR-MON_PM sy-vline 
WA_RN1IS1_STR-TUE_AM sy-vline 
WA_RN1IS1_STR-TUE_PM sy-vline 
WA_RN1IS1_STR-WED_AM sy-vline 
WA_RN1IS1_STR-WED_PM sy-vline 
WA_RN1IS1_STR-THU_AM sy-vline 
WA_RN1IS1_STR-THU_PM sy-vline 
WA_RN1IS1_STR-FRI_AM sy-vline 
WA_RN1IS1_STR-FRI_PM sy-vline 
WA_RN1IS1_STR-VKG_NO sy-vline 
WA_RN1IS1_STR-LEIST_NO sy-vline 
WA_RN1IS1_STR-GROUP_SRV_NO sy-vline 
WA_RN1IS1_STR-APP_NO sy-vline 
WA_RN1IS1_STR-NNAME sy-vline 
WA_RN1IS1_STR-VNAME sy-vline 
WA_RN1IS1_STR-GBDAT sy-vline 
WA_RN1IS1_STR-GSCHL sy-vline 
WA_RN1IS1_STR-GSCHLE sy-vline 
WA_RN1IS1_STR-PATNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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