ABAP Select data from SAP table RNNG1 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 RNNG1 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 RNNG1. 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 RNNG1 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_RNNG1 TYPE STANDARD TABLE OF RNNG1,
      WA_RNNG1 TYPE RNNG1,
      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: <RNNG1> TYPE RNNG1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNNG1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNNG1
  INTO TABLE IT_RNNG1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNNG1
*  INTO TABLE @DATA(IT_RNNG12).
*--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_RNNG1 INDEX 1 INTO DATA(WA_RNNG12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNNG1 ASSIGNING <RNNG1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNNG1>-MANDT = 1.
<RNNG1>-PERNR = 1.
<RNNG1>-VORNA = 1.
<RNNG1>-GESCH = 1.
<RNNG1>-LANDX = 1.

ENDLOOP.

LOOP AT IT_RNNG1 INTO WA_RNNG1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNNG1-BEZEI, sy-vline,
  WA_RNNG1-PERS, sy-vline,
  WA_RNNG1-GPART, sy-vline,
  WA_RNNG1-KOSTR, sy-vline,
  WA_RNNG1-KRKHS, sy-vline,
  WA_RNNG1-DEBIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNNG1 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_RNNG1 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_RNNG1 INTO WA_RNNG1.


*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 PERNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNNG1-PERNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNNG1-PERNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field GPART2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNNG1-GPART2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNNG1-GPART2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PERS2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNNG1-PERS2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNNG1-PERS2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTR2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNNG1-KOSTR2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNNG1-KOSTR2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DEBIT2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNNG1-DEBIT2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNNG1-DEBIT2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ARBTG2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNNG1-ARBTG2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNNG1-ARBTG2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KRKHS2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNNG1-KRKHS2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNNG1-KRKHS2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNNG1-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNNG1-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EINRI1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNNG1-EINRI1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNNG1-EINRI1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EINRI2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNNG1-EINRI2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNNG1-EINRI2.
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_RNNG1_STR, 
MANDT TYPE STRING,
PERNR TYPE STRING,
VORNA TYPE STRING,
GESCH TYPE STRING,
LANDX TYPE STRING,
BEZEI TYPE STRING,
PERS TYPE STRING,
GPART TYPE STRING,
KOSTR TYPE STRING,
KRKHS TYPE STRING,
DEBIT TYPE STRING,
ARBTG TYPE STRING,
LGTXT TYPE STRING,
GPART2 TYPE STRING,
PERS2 TYPE STRING,
KOSTR2 TYPE STRING,
DEBIT2 TYPE STRING,
ARBTG2 TYPE STRING,
KRKHS2 TYPE STRING,
NAME1 TYPE STRING,
NAME2 TYPE STRING,
KNAME TYPE STRING,
GSCHL TYPE STRING,
PSTLZ TYPE STRING,
ORT TYPE STRING,
ANREDE TYPE STRING,
ARZT TYPE STRING,
MAKZ TYPE STRING,
PFLEG TYPE STRING,
BARZT TYPE STRING,
ARZTN TYPE STRING,
VCODE TYPE STRING,
EINRI TYPE STRING,
EINRI1 TYPE STRING,
EINRI2 TYPE STRING,
INSDEB TYPE STRING,
LOEKZ TYPE STRING,
SPVON TYPE STRING,
SPBIS TYPE STRING,
TAXTX TYPE STRING,
SPERR TYPE STRING,
FATXT TYPE STRING,
FTTXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNNG1_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_RNNG1_STR-MANDT sy-vline 
WA_RNNG1_STR-PERNR sy-vline 
WA_RNNG1_STR-VORNA sy-vline 
WA_RNNG1_STR-GESCH sy-vline 
WA_RNNG1_STR-LANDX sy-vline 
WA_RNNG1_STR-BEZEI sy-vline 
WA_RNNG1_STR-PERS sy-vline 
WA_RNNG1_STR-GPART sy-vline 
WA_RNNG1_STR-KOSTR sy-vline 
WA_RNNG1_STR-KRKHS sy-vline 
WA_RNNG1_STR-DEBIT sy-vline 
WA_RNNG1_STR-ARBTG sy-vline 
WA_RNNG1_STR-LGTXT sy-vline 
WA_RNNG1_STR-GPART2 sy-vline 
WA_RNNG1_STR-PERS2 sy-vline 
WA_RNNG1_STR-KOSTR2 sy-vline 
WA_RNNG1_STR-DEBIT2 sy-vline 
WA_RNNG1_STR-ARBTG2 sy-vline 
WA_RNNG1_STR-KRKHS2 sy-vline 
WA_RNNG1_STR-NAME1 sy-vline 
WA_RNNG1_STR-NAME2 sy-vline 
WA_RNNG1_STR-KNAME sy-vline 
WA_RNNG1_STR-GSCHL sy-vline 
WA_RNNG1_STR-PSTLZ sy-vline 
WA_RNNG1_STR-ORT sy-vline 
WA_RNNG1_STR-ANREDE sy-vline 
WA_RNNG1_STR-ARZT sy-vline 
WA_RNNG1_STR-MAKZ sy-vline 
WA_RNNG1_STR-PFLEG sy-vline 
WA_RNNG1_STR-BARZT sy-vline 
WA_RNNG1_STR-ARZTN sy-vline 
WA_RNNG1_STR-VCODE sy-vline 
WA_RNNG1_STR-EINRI sy-vline 
WA_RNNG1_STR-EINRI1 sy-vline 
WA_RNNG1_STR-EINRI2 sy-vline 
WA_RNNG1_STR-INSDEB sy-vline 
WA_RNNG1_STR-LOEKZ sy-vline 
WA_RNNG1_STR-SPVON sy-vline 
WA_RNNG1_STR-SPBIS sy-vline 
WA_RNNG1_STR-TAXTX sy-vline 
WA_RNNG1_STR-SPERR sy-vline 
WA_RNNG1_STR-FATXT sy-vline 
WA_RNNG1_STR-FTTXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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