ABAP Select data from SAP table CNVFIREF_DELTA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNVFIREF_DELTA
*  INTO TABLE @DATA(IT_CNVFIREF_DELTA2).
*--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_CNVFIREF_DELTA INDEX 1 INTO DATA(WA_CNVFIREF_DELTA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNVFIREF_DELTA>-MANDT = 1.
<CNVFIREF_DELTA>-RELEASE = 1.
<CNVFIREF_DELTA>-TABNAME = 1.
<CNVFIREF_DELTA>-FIELDNAME = 1.
<CNVFIREF_DELTA>-DERIVATIONTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNVFIREF_DELTA-STATE, sy-vline,
  WA_CNVFIREF_DELTA-DOMNAME, sy-vline,
  WA_CNVFIREF_DELTA-SELECTIONTYPE, sy-vline,
  WA_CNVFIREF_DELTA-SELECTIONMODE, sy-vline,
  WA_CNVFIREF_DELTA-SELECTION, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_CNVFIREF_DELTA 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_CNVFIREF_DELTA 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_CNVFIREF_DELTA INTO WA_CNVFIREF_DELTA.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_CNVFIREF_DELTA_STR, 
MANDT TYPE STRING,
RELEASE TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
DERIVATIONTYPE TYPE STRING,
STATE TYPE STRING,
DOMNAME TYPE STRING,
SELECTIONTYPE TYPE STRING,
SELECTIONMODE TYPE STRING,
SELECTION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNVFIREF_DELTA_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_CNVFIREF_DELTA_STR-MANDT sy-vline 
WA_CNVFIREF_DELTA_STR-RELEASE sy-vline 
WA_CNVFIREF_DELTA_STR-TABNAME sy-vline 
WA_CNVFIREF_DELTA_STR-FIELDNAME sy-vline 
WA_CNVFIREF_DELTA_STR-DERIVATIONTYPE sy-vline 
WA_CNVFIREF_DELTA_STR-STATE sy-vline 
WA_CNVFIREF_DELTA_STR-DOMNAME sy-vline 
WA_CNVFIREF_DELTA_STR-SELECTIONTYPE sy-vline 
WA_CNVFIREF_DELTA_STR-SELECTIONMODE sy-vline 
WA_CNVFIREF_DELTA_STR-SELECTION sy-vline      INTO ld_text SEPARATED BY SPACE.

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