ABAP Select data from SAP table DATEFUNCTION into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DATEFUNCTION
*  INTO TABLE @DATA(IT_DATEFUNCTION2).
*--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_DATEFUNCTION INDEX 1 INTO DATA(WA_DATEFUNCTION2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DATEFUNCTION>-ID = 1.
<DATEFUNCTION>-ABAP_LANGUAGE_VERSION = 1.
<DATEFUNCTION>-TYPE = 1.
<DATEFUNCTION>-GRANULARITY = 1.
<DATEFUNCTION>-CALENDARTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DATEFUNCTION-STARTPOINT, sy-vline,
  WA_DATEFUNCTION-STARTOFFSET, sy-vline,
  WA_DATEFUNCTION-STARTRELATIVEOFFSET, sy-vline,
  WA_DATEFUNCTION-STARTOFFSETUNIT, sy-vline,
  WA_DATEFUNCTION-STARTRELATIVEOFFSETUNIT, sy-vline,
  WA_DATEFUNCTION-STARTYEAROFFSET, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DATEFUNCTION 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_DATEFUNCTION 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_DATEFUNCTION INTO WA_DATEFUNCTION.


*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_DATEFUNCTION_STR, 
ID TYPE STRING,
ABAP_LANGUAGE_VERSION TYPE STRING,
TYPE TYPE STRING,
GRANULARITY TYPE STRING,
CALENDARTYPE TYPE STRING,
STARTPOINT TYPE STRING,
STARTOFFSET TYPE STRING,
STARTRELATIVEOFFSET TYPE STRING,
STARTOFFSETUNIT TYPE STRING,
STARTRELATIVEOFFSETUNIT TYPE STRING,
STARTYEAROFFSET TYPE STRING,
STARTFIXEDDATE TYPE STRING,
ENDPOINT TYPE STRING,
ENDOFFSET TYPE STRING,
ENDRELATIVEOFFSET TYPE STRING,
ENDOFFSETUNIT TYPE STRING,
ENDRELATIVEOFFSETUNIT TYPE STRING,
ENDYEAROFFSET TYPE STRING,
ENDFIXEDDATE TYPE STRING,
CREATEDBY TYPE STRING,
CREATEDON TYPE STRING,
CHANGEDBY TYPE STRING,
CHANGEDON TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DATEFUNCTION_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_DATEFUNCTION_STR-ID sy-vline 
WA_DATEFUNCTION_STR-ABAP_LANGUAGE_VERSION sy-vline 
WA_DATEFUNCTION_STR-TYPE sy-vline 
WA_DATEFUNCTION_STR-GRANULARITY sy-vline 
WA_DATEFUNCTION_STR-CALENDARTYPE sy-vline 
WA_DATEFUNCTION_STR-STARTPOINT sy-vline 
WA_DATEFUNCTION_STR-STARTOFFSET sy-vline 
WA_DATEFUNCTION_STR-STARTRELATIVEOFFSET sy-vline 
WA_DATEFUNCTION_STR-STARTOFFSETUNIT sy-vline 
WA_DATEFUNCTION_STR-STARTRELATIVEOFFSETUNIT sy-vline 
WA_DATEFUNCTION_STR-STARTYEAROFFSET sy-vline 
WA_DATEFUNCTION_STR-STARTFIXEDDATE sy-vline 
WA_DATEFUNCTION_STR-ENDPOINT sy-vline 
WA_DATEFUNCTION_STR-ENDOFFSET sy-vline 
WA_DATEFUNCTION_STR-ENDRELATIVEOFFSET sy-vline 
WA_DATEFUNCTION_STR-ENDOFFSETUNIT sy-vline 
WA_DATEFUNCTION_STR-ENDRELATIVEOFFSETUNIT sy-vline 
WA_DATEFUNCTION_STR-ENDYEAROFFSET sy-vline 
WA_DATEFUNCTION_STR-ENDFIXEDDATE sy-vline 
WA_DATEFUNCTION_STR-CREATEDBY sy-vline 
WA_DATEFUNCTION_STR-CREATEDON sy-vline 
WA_DATEFUNCTION_STR-CHANGEDBY sy-vline 
WA_DATEFUNCTION_STR-CHANGEDON sy-vline      INTO ld_text SEPARATED BY SPACE.

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