ABAP Select data from SAP table CNVC_SCNR_NRIV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNVC_SCNR_NRIV
*  INTO TABLE @DATA(IT_CNVC_SCNR_NRIV2).
*--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_CNVC_SCNR_NRIV INDEX 1 INTO DATA(WA_CNVC_SCNR_NRIV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNVC_SCNR_NRIV>-CLIENT = 1.
<CNVC_SCNR_NRIV>-RUNID = 1.
<CNVC_SCNR_NRIV>-SID = 1.
<CNVC_SCNR_NRIV>-OBJECT = 1.
<CNVC_SCNR_NRIV>-SUBOBJECT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNVC_SCNR_NRIV-NRRANGENR, sy-vline,
  WA_CNVC_SCNR_NRIV-TOYEAR, sy-vline,
  WA_CNVC_SCNR_NRIV-FROMNUMBER, sy-vline,
  WA_CNVC_SCNR_NRIV-TONUMBER, sy-vline,
  WA_CNVC_SCNR_NRIV-NRLEVEL, sy-vline,
  WA_CNVC_SCNR_NRIV-EXTERNIND, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNVC_SCNR_NRIV 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_CNVC_SCNR_NRIV 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_CNVC_SCNR_NRIV INTO WA_CNVC_SCNR_NRIV.


*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 GJAHR, internal->external for field TOYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_CNVC_SCNR_NRIV-TOYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNVC_SCNR_NRIV-TOYEAR.
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_CNVC_SCNR_NRIV_STR, 
CLIENT TYPE STRING,
RUNID TYPE STRING,
SID TYPE STRING,
OBJECT TYPE STRING,
SUBOBJECT TYPE STRING,
NRRANGENR TYPE STRING,
TOYEAR TYPE STRING,
FROMNUMBER TYPE STRING,
TONUMBER TYPE STRING,
NRLEVEL TYPE STRING,
EXTERNIND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNVC_SCNR_NRIV_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_CNVC_SCNR_NRIV_STR-CLIENT sy-vline 
WA_CNVC_SCNR_NRIV_STR-RUNID sy-vline 
WA_CNVC_SCNR_NRIV_STR-SID sy-vline 
WA_CNVC_SCNR_NRIV_STR-OBJECT sy-vline 
WA_CNVC_SCNR_NRIV_STR-SUBOBJECT sy-vline 
WA_CNVC_SCNR_NRIV_STR-NRRANGENR sy-vline 
WA_CNVC_SCNR_NRIV_STR-TOYEAR sy-vline 
WA_CNVC_SCNR_NRIV_STR-FROMNUMBER sy-vline 
WA_CNVC_SCNR_NRIV_STR-TONUMBER sy-vline 
WA_CNVC_SCNR_NRIV_STR-NRLEVEL sy-vline 
WA_CNVC_SCNR_NRIV_STR-EXTERNIND sy-vline      INTO ld_text SEPARATED BY SPACE.

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