ABAP Select data from SAP table DTATCHI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DTATCHI
*  INTO TABLE @DATA(IT_DTATCHI2).
*--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_DTATCHI INDEX 1 INTO DATA(WA_DTATCHI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DTATCHI>-IHDR = 1.
<DTATCHI>-I155 = 1.
<DTATCHI>-I700 = 1.
<DTATCHI>-I710 = 1.
<DTATCHI>-I725 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DTATCHI-I735, sy-vline,
  WA_DTATCHI-I740, sy-vline,
  WA_DTATCHI-I745, sy-vline,
  WA_DTATCHI-I750, sy-vline,
  WA_DTATCHI-I755, sy-vline,
  WA_DTATCHI-I760, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DTATCHI 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_DTATCHI 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_DTATCHI INTO WA_DTATCHI.


*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_DTATCHI_STR, 
IHDR TYPE STRING,
I155 TYPE STRING,
I700 TYPE STRING,
I710 TYPE STRING,
I725 TYPE STRING,
I735 TYPE STRING,
I740 TYPE STRING,
I745 TYPE STRING,
I750 TYPE STRING,
I755 TYPE STRING,
I760 TYPE STRING,
I765 TYPE STRING,
I770 TYPE STRING,
I775 TYPE STRING,
I780 TYPE STRING,
I785 TYPE STRING,
I790 TYPE STRING,
I791 TYPE STRING,
I792 TYPE STRING,
I793 TYPE STRING,
I798 TYPE STRING,
I800 TYPE STRING,
I805 TYPE STRING,
I810 TYPE STRING,
I815 TYPE STRING,
I820 TYPE STRING,
I825 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DTATCHI_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_DTATCHI_STR-IHDR sy-vline 
WA_DTATCHI_STR-I155 sy-vline 
WA_DTATCHI_STR-I700 sy-vline 
WA_DTATCHI_STR-I710 sy-vline 
WA_DTATCHI_STR-I725 sy-vline 
WA_DTATCHI_STR-I735 sy-vline 
WA_DTATCHI_STR-I740 sy-vline 
WA_DTATCHI_STR-I745 sy-vline 
WA_DTATCHI_STR-I750 sy-vline 
WA_DTATCHI_STR-I755 sy-vline 
WA_DTATCHI_STR-I760 sy-vline 
WA_DTATCHI_STR-I765 sy-vline 
WA_DTATCHI_STR-I770 sy-vline 
WA_DTATCHI_STR-I775 sy-vline 
WA_DTATCHI_STR-I780 sy-vline 
WA_DTATCHI_STR-I785 sy-vline 
WA_DTATCHI_STR-I790 sy-vline 
WA_DTATCHI_STR-I791 sy-vline 
WA_DTATCHI_STR-I792 sy-vline 
WA_DTATCHI_STR-I793 sy-vline 
WA_DTATCHI_STR-I798 sy-vline 
WA_DTATCHI_STR-I800 sy-vline 
WA_DTATCHI_STR-I805 sy-vline 
WA_DTATCHI_STR-I810 sy-vline 
WA_DTATCHI_STR-I815 sy-vline 
WA_DTATCHI_STR-I820 sy-vline 
WA_DTATCHI_STR-I825 sy-vline      INTO ld_text SEPARATED BY SPACE.

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