ABAP Select data from SAP table VN1CYDEF into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VN1CYDEF 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 VN1CYDEF. 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 VN1CYDEF 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_VN1CYDEF TYPE STANDARD TABLE OF VN1CYDEF,
      WA_VN1CYDEF TYPE VN1CYDEF,
      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: <VN1CYDEF> TYPE VN1CYDEF.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_VN1CYDEF.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM VN1CYDEF
  INTO TABLE IT_VN1CYDEF.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VN1CYDEF
*  INTO TABLE @DATA(IT_VN1CYDEF2).
*--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_VN1CYDEF INDEX 1 INTO DATA(WA_VN1CYDEF2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_VN1CYDEF ASSIGNING <VN1CYDEF>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VN1CYDEF>-MANDT = 1.
<VN1CYDEF>-CYDEFID = 1.
<VN1CYDEF>-GENCYID = 1.
<VN1CYDEF>-BEGDT = 1.
<VN1CYDEF>-ENDDT = 1.

ENDLOOP.

LOOP AT IT_VN1CYDEF INTO WA_VN1CYDEF.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VN1CYDEF-INTER_T, sy-vline,
  WA_VN1CYDEF-INTER_H, sy-vline,
  WA_VN1CYDEF-BEGZT, sy-vline,
  WA_VN1CYDEF-ENDZT, sy-vline,
  WA_VN1CYDEF-MON, sy-vline,
  WA_VN1CYDEF-DIE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VN1CYDEF 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_VN1CYDEF 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_VN1CYDEF INTO WA_VN1CYDEF.


*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 ME12D, internal->external for field DOSEDEC
CALL FUNCTION 'CONVERSION_EXIT_ME12D_OUTPUT'
  EXPORTING
    input =                      WA_VN1CYDEF-DOSEDEC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VN1CYDEF-DOSEDEC.
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_VN1CYDEF_STR, 
MANDT TYPE STRING,
CYDEFID TYPE STRING,
GENCYID TYPE STRING,
BEGDT TYPE STRING,
ENDDT TYPE STRING,
INTER_T TYPE STRING,
INTER_H TYPE STRING,
BEGZT TYPE STRING,
ENDZT TYPE STRING,
MON TYPE STRING,
DIE TYPE STRING,
MIT TYPE STRING,
DON TYPE STRING,
FRE TYPE STRING,
SAM TYPE STRING,
SON TYPE STRING,
FEIERTAG TYPE STRING,
MENGE TYPE STRING,
BEM TYPE STRING,
PERIOD TYPE STRING,
ZNR TYPE STRING,
MANU TYPE STRING,
N1CWFT TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
STORN TYPE STRING,
STUSR TYPE STRING,
STDAT TYPE STRING,
N1EXT TYPE STRING,
N1TIMSP TYPE STRING,
N1INTER_M TYPE STRING,
ZNR_ORIGIN TYPE STRING,
RETRO TYPE STRING,
FORWARD TYPE STRING,
SETTIME TYPE STRING,
DAYCYCLE TYPE STRING,
DOSEDEC TYPE STRING,
SLDOSEID TYPE STRING,
LFNR TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VN1CYDEF_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_VN1CYDEF_STR-MANDT sy-vline 
WA_VN1CYDEF_STR-CYDEFID sy-vline 
WA_VN1CYDEF_STR-GENCYID sy-vline 
WA_VN1CYDEF_STR-BEGDT sy-vline 
WA_VN1CYDEF_STR-ENDDT sy-vline 
WA_VN1CYDEF_STR-INTER_T sy-vline 
WA_VN1CYDEF_STR-INTER_H sy-vline 
WA_VN1CYDEF_STR-BEGZT sy-vline 
WA_VN1CYDEF_STR-ENDZT sy-vline 
WA_VN1CYDEF_STR-MON sy-vline 
WA_VN1CYDEF_STR-DIE sy-vline 
WA_VN1CYDEF_STR-MIT sy-vline 
WA_VN1CYDEF_STR-DON sy-vline 
WA_VN1CYDEF_STR-FRE sy-vline 
WA_VN1CYDEF_STR-SAM sy-vline 
WA_VN1CYDEF_STR-SON sy-vline 
WA_VN1CYDEF_STR-FEIERTAG sy-vline 
WA_VN1CYDEF_STR-MENGE sy-vline 
WA_VN1CYDEF_STR-BEM sy-vline 
WA_VN1CYDEF_STR-PERIOD sy-vline 
WA_VN1CYDEF_STR-ZNR sy-vline 
WA_VN1CYDEF_STR-MANU sy-vline 
WA_VN1CYDEF_STR-N1CWFT sy-vline 
WA_VN1CYDEF_STR-ERDAT sy-vline 
WA_VN1CYDEF_STR-ERUSR sy-vline 
WA_VN1CYDEF_STR-UPDAT sy-vline 
WA_VN1CYDEF_STR-UPUSR sy-vline 
WA_VN1CYDEF_STR-STORN sy-vline 
WA_VN1CYDEF_STR-STUSR sy-vline 
WA_VN1CYDEF_STR-STDAT sy-vline 
WA_VN1CYDEF_STR-N1EXT sy-vline 
WA_VN1CYDEF_STR-N1TIMSP sy-vline 
WA_VN1CYDEF_STR-N1INTER_M sy-vline 
WA_VN1CYDEF_STR-ZNR_ORIGIN sy-vline 
WA_VN1CYDEF_STR-RETRO sy-vline 
WA_VN1CYDEF_STR-FORWARD sy-vline 
WA_VN1CYDEF_STR-SETTIME sy-vline 
WA_VN1CYDEF_STR-DAYCYCLE sy-vline 
WA_VN1CYDEF_STR-DOSEDEC sy-vline 
WA_VN1CYDEF_STR-SLDOSEID sy-vline 
WA_VN1CYDEF_STR-LFNR sy-vline 
WA_VN1CYDEF_STR-KZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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