ABAP Select data from SAP table V_NC301B into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_NC301B 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 V_NC301B. 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 V_NC301B 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_V_NC301B TYPE STANDARD TABLE OF V_NC301B,
      WA_V_NC301B TYPE V_NC301B,
      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: <V_NC301B> TYPE V_NC301B.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_V_NC301B.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM V_NC301B
  INTO TABLE IT_V_NC301B.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_NC301B
*  INTO TABLE @DATA(IT_V_NC301B2).
*--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_V_NC301B INDEX 1 INTO DATA(WA_V_NC301B2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_V_NC301B ASSIGNING <V_NC301B>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_NC301B>-MANDT = 1.
<V_NC301B>-EINRI = 1.
<V_NC301B>-DAS301 = 1.
<V_NC301B>-EDIPROC = 1.
<V_NC301B>-NINOUTSIGN = 1.

ENDLOOP.

LOOP AT IT_V_NC301B INTO WA_V_NC301B.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_NC301B-LF301M, sy-vline,
  WA_V_NC301B-PATH301, sy-vline,
  WA_V_NC301B-CODEPAGE, sy-vline,
  WA_V_NC301B-SPECHARS, sy-vline,
  WA_V_NC301B-CODEKEY, sy-vline,
  WA_V_NC301B-COMPR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_NC301B 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_V_NC301B 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_V_NC301B INTO WA_V_NC301B.


*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_V_NC301B-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_NC301B-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field LF301Y
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_V_NC301B-LF301Y
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_NC301B-LF301Y.
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_V_NC301B_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
DAS301 TYPE STRING,
EDIPROC TYPE STRING,
NINOUTSIGN TYPE STRING,
LF301M TYPE STRING,
PATH301 TYPE STRING,
CODEPAGE TYPE STRING,
SPECHARS TYPE STRING,
CODEKEY TYPE STRING,
COMPR TYPE STRING,
FILEDT TYPE STRING,
FILEZT TYPE STRING,
FILESZMAX TYPE STRING,
STAND TYPE STRING,
STVER TYPE STRING,
UPDAT TYPE STRING,
UPTIM TYPE STRING,
UPUSR TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
ERUSR TYPE STRING,
DAS301KB TYPE STRING,
CPCOMMENT TYPE STRING,
SENDDAYS TYPE STRING,
SENDTIME TYPE STRING,
CALID TYPE STRING,
EDITEXT TYPE STRING,
TECHADR TYPE STRING,
ADRTYPE TYPE STRING,
SIGNAT TYPE STRING,
CRYPTO TYPE STRING,
MSGSZMAX TYPE STRING,
LF301Y TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_NC301B_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_V_NC301B_STR-MANDT sy-vline 
WA_V_NC301B_STR-EINRI sy-vline 
WA_V_NC301B_STR-DAS301 sy-vline 
WA_V_NC301B_STR-EDIPROC sy-vline 
WA_V_NC301B_STR-NINOUTSIGN sy-vline 
WA_V_NC301B_STR-LF301M sy-vline 
WA_V_NC301B_STR-PATH301 sy-vline 
WA_V_NC301B_STR-CODEPAGE sy-vline 
WA_V_NC301B_STR-SPECHARS sy-vline 
WA_V_NC301B_STR-CODEKEY sy-vline 
WA_V_NC301B_STR-COMPR sy-vline 
WA_V_NC301B_STR-FILEDT sy-vline 
WA_V_NC301B_STR-FILEZT sy-vline 
WA_V_NC301B_STR-FILESZMAX sy-vline 
WA_V_NC301B_STR-STAND sy-vline 
WA_V_NC301B_STR-STVER sy-vline 
WA_V_NC301B_STR-UPDAT sy-vline 
WA_V_NC301B_STR-UPTIM sy-vline 
WA_V_NC301B_STR-UPUSR sy-vline 
WA_V_NC301B_STR-ERDAT sy-vline 
WA_V_NC301B_STR-ERTIM sy-vline 
WA_V_NC301B_STR-ERUSR sy-vline 
WA_V_NC301B_STR-DAS301KB sy-vline 
WA_V_NC301B_STR-CPCOMMENT sy-vline 
WA_V_NC301B_STR-SENDDAYS sy-vline 
WA_V_NC301B_STR-SENDTIME sy-vline 
WA_V_NC301B_STR-CALID sy-vline 
WA_V_NC301B_STR-EDITEXT sy-vline 
WA_V_NC301B_STR-TECHADR sy-vline 
WA_V_NC301B_STR-ADRTYPE sy-vline 
WA_V_NC301B_STR-SIGNAT sy-vline 
WA_V_NC301B_STR-CRYPTO sy-vline 
WA_V_NC301B_STR-MSGSZMAX sy-vline 
WA_V_NC301B_STR-LF301Y sy-vline      INTO ld_text SEPARATED BY SPACE.

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