ABAP Select data from SAP table DTADATE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DTADATE
*  INTO TABLE @DATA(IT_DTADATE2).
*--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_DTADATE INDEX 1 INTO DATA(WA_DTADATE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DTADATE>-FELD40 = 1.
<DTADATE>-FELD41 = 1.
<DTADATE>-FELD42 = 1.
<DTADATE>-FELD43 = 1.
<DTADATE>-FELD44 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DTADATE-FELD45, sy-vline,
  WA_DTADATE-FELD46, sy-vline,
  WA_DTADATE-FELD47, sy-vline,
  WA_DTADATE-FELD48, sy-vline,
  WA_DTADATE-FELD49, sy-vline,
  WA_DTADATE-FELD50, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DTADATE 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_DTADATE 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_DTADATE INTO WA_DTADATE.


*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_DTADATE_STR, 
FELD40 TYPE STRING,
FELD41 TYPE STRING,
FELD42 TYPE STRING,
FELD43 TYPE STRING,
FELD44 TYPE STRING,
FELD45 TYPE STRING,
FELD46 TYPE STRING,
FELD47 TYPE STRING,
FELD48 TYPE STRING,
FELD49 TYPE STRING,
FELD50 TYPE STRING,
FELD51 TYPE STRING,
FELD52 TYPE STRING,
FELD53 TYPE STRING,
FELDCRLF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DTADATE_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_DTADATE_STR-FELD40 sy-vline 
WA_DTADATE_STR-FELD41 sy-vline 
WA_DTADATE_STR-FELD42 sy-vline 
WA_DTADATE_STR-FELD43 sy-vline 
WA_DTADATE_STR-FELD44 sy-vline 
WA_DTADATE_STR-FELD45 sy-vline 
WA_DTADATE_STR-FELD46 sy-vline 
WA_DTADATE_STR-FELD47 sy-vline 
WA_DTADATE_STR-FELD48 sy-vline 
WA_DTADATE_STR-FELD49 sy-vline 
WA_DTADATE_STR-FELD50 sy-vline 
WA_DTADATE_STR-FELD51 sy-vline 
WA_DTADATE_STR-FELD52 sy-vline 
WA_DTADATE_STR-FELD53 sy-vline 
WA_DTADATE_STR-FELDCRLF sy-vline      INTO ld_text SEPARATED BY SPACE.

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