ABAP Select data from SAP table CDATEFNC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CDATEFNC
*  INTO TABLE @DATA(IT_CDATEFNC2).
*--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_CDATEFNC INDEX 1 INTO DATA(WA_CDATEFNC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CDATEFNC>-DATEFUNCTION = 1.
<CDATEFNC>-DATEFUNCTIONTYPE = 1.
<CDATEFNC>-DATEFUNCTIONGRANULARITY = 1.
<CDATEFNC>-DATEFUNCTIONCALENDARTYPE = 1.
<CDATEFNC>-DATEFUNCTIONSTARTPOINT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CDATEFNC-DATEFUNCTIONSTARTOFFSETVALUE, sy-vline,
  WA_CDATEFNC-DATEFUNCSTARTRELATIVEOFFSET, sy-vline,
  WA_CDATEFNC-DATEFUNCTIONSTARTOFFSETUNIT, sy-vline,
  WA_CDATEFNC-DATEFUNCTIONSTARTRELOFFSETUNIT, sy-vline,
  WA_CDATEFNC-DATEFUNCTIONSTARTYEAROFFSET, sy-vline,
  WA_CDATEFNC-DATEFUNCTIONSTARTFIXEDDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CDATEFNC 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_CDATEFNC 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_CDATEFNC INTO WA_CDATEFNC.


*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_CDATEFNC_STR, 
DATEFUNCTION TYPE STRING,
DATEFUNCTIONTYPE TYPE STRING,
DATEFUNCTIONGRANULARITY TYPE STRING,
DATEFUNCTIONCALENDARTYPE TYPE STRING,
DATEFUNCTIONSTARTPOINT TYPE STRING,
DATEFUNCTIONSTARTOFFSETVALUE TYPE STRING,
DATEFUNCSTARTRELATIVEOFFSET TYPE STRING,
DATEFUNCTIONSTARTOFFSETUNIT TYPE STRING,
DATEFUNCTIONSTARTRELOFFSETUNIT TYPE STRING,
DATEFUNCTIONSTARTYEAROFFSET TYPE STRING,
DATEFUNCTIONSTARTFIXEDDATE TYPE STRING,
DATEFUNCTIONENDPOINT TYPE STRING,
DATEFUNCTIONENDOFFSETVALUE TYPE STRING,
DATEFUNCTIONENDRELATIVEOFFSET TYPE STRING,
DATEFUNCTIONENDOFFSETUNIT TYPE STRING,
DATEFUNCTIONENDRELOFFSETUNIT TYPE STRING,
DATEFUNCTIONENDYEAROFFSET TYPE STRING,
DATEFUNCTIONENDFIXEDDATE TYPE STRING,
DATEFUNCTIONNAME TYPE STRING,
DATEFUNCTIONDESCRIPTION TYPE STRING,
DATEFUNCTIONSTARTDATE TYPE STRING,
DATEFUNCTIONENDDATE TYPE STRING,
DATEFUNCTIONTYPENAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CDATEFNC_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_CDATEFNC_STR-DATEFUNCTION sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONTYPE sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONGRANULARITY sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONCALENDARTYPE sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONSTARTPOINT sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONSTARTOFFSETVALUE sy-vline 
WA_CDATEFNC_STR-DATEFUNCSTARTRELATIVEOFFSET sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONSTARTOFFSETUNIT sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONSTARTRELOFFSETUNIT sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONSTARTYEAROFFSET sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONSTARTFIXEDDATE sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONENDPOINT sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONENDOFFSETVALUE sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONENDRELATIVEOFFSET sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONENDOFFSETUNIT sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONENDRELOFFSETUNIT sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONENDYEAROFFSET sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONENDFIXEDDATE sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONNAME sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONDESCRIPTION sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONSTARTDATE sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONENDDATE sy-vline 
WA_CDATEFNC_STR-DATEFUNCTIONTYPENAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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