ABAP Select data from SAP table VNWAT_NWAT_SCO_MEL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VNWAT_NWAT_SCO_MEL
*  INTO TABLE @DATA(IT_VNWAT_NWAT_SCO_MEL2).
*--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_VNWAT_NWAT_SCO_MEL INDEX 1 INTO DATA(WA_VNWAT_NWAT_SCO_MEL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VNWAT_NWAT_SCO_MEL>-MANDT = 1.
<VNWAT_NWAT_SCO_MEL>-EINRI = 1.
<VNWAT_NWAT_SCO_MEL>-FALNR = 1.
<VNWAT_NWAT_SCO_MEL>-LNRLS = 1.
<VNWAT_NWAT_SCO_MEL>-LEIST = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VNWAT_NWAT_SCO_MEL-LFDNR, sy-vline,
  WA_VNWAT_NWAT_SCO_MEL-IBGDT, sy-vline,
  WA_VNWAT_NWAT_SCO_MEL-LMENG, sy-vline,
  WA_VNWAT_NWAT_SCO_MEL-LSSEL, sy-vline,
  WA_VNWAT_NWAT_SCO_MEL-ERDAT, sy-vline,
  WA_VNWAT_NWAT_SCO_MEL-ERUSR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VNWAT_NWAT_SCO_MEL 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_VNWAT_NWAT_SCO_MEL 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_VNWAT_NWAT_SCO_MEL INTO WA_VNWAT_NWAT_SCO_MEL.


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

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

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

*Conversion exit ALPHA, internal->external for field LEIST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNWAT_NWAT_SCO_MEL-LEIST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWAT_NWAT_SCO_MEL-LEIST.
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_VNWAT_NWAT_SCO_MEL_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
FALNR TYPE STRING,
LNRLS TYPE STRING,
LEIST TYPE STRING,
LFDNR TYPE STRING,
IBGDT TYPE STRING,
LMENG TYPE STRING,
LSSEL TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
STDAT TYPE STRING,
STORN TYPE STRING,
STUSR TYPE STRING,
TIMESTAMP TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VNWAT_NWAT_SCO_MEL_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_VNWAT_NWAT_SCO_MEL_STR-MANDT sy-vline 
WA_VNWAT_NWAT_SCO_MEL_STR-EINRI sy-vline 
WA_VNWAT_NWAT_SCO_MEL_STR-FALNR sy-vline 
WA_VNWAT_NWAT_SCO_MEL_STR-LNRLS sy-vline 
WA_VNWAT_NWAT_SCO_MEL_STR-LEIST sy-vline 
WA_VNWAT_NWAT_SCO_MEL_STR-LFDNR sy-vline 
WA_VNWAT_NWAT_SCO_MEL_STR-IBGDT sy-vline 
WA_VNWAT_NWAT_SCO_MEL_STR-LMENG sy-vline 
WA_VNWAT_NWAT_SCO_MEL_STR-LSSEL sy-vline 
WA_VNWAT_NWAT_SCO_MEL_STR-ERDAT sy-vline 
WA_VNWAT_NWAT_SCO_MEL_STR-ERUSR sy-vline 
WA_VNWAT_NWAT_SCO_MEL_STR-UPDAT sy-vline 
WA_VNWAT_NWAT_SCO_MEL_STR-UPUSR sy-vline 
WA_VNWAT_NWAT_SCO_MEL_STR-STDAT sy-vline 
WA_VNWAT_NWAT_SCO_MEL_STR-STORN sy-vline 
WA_VNWAT_NWAT_SCO_MEL_STR-STUSR sy-vline 
WA_VNWAT_NWAT_SCO_MEL_STR-TIMESTAMP sy-vline 
WA_VNWAT_NWAT_SCO_MEL_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.