ABAP Select data from SAP table IATDGRAT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IATDGRAT
*  INTO TABLE @DATA(IT_IATDGRAT2).
*--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_IATDGRAT INDEX 1 INTO DATA(WA_IATDGRAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IATDGRAT>-MANDT = 1.
<IATDGRAT>-ACTYTYPEWHEREUSEDOBJTYPE = 1.
<IATDGRAT>-SETCLASS = 1.
<IATDGRAT>-SETSUBCLASS = 1.
<IATDGRAT>-UNIVERSALHIERNODEPARENTID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IATDGRAT-COSTCTRACTIVITYTYPE, sy-vline,
  WA_IATDGRAT-CONTROLLINGAREA, sy-vline,
  WA_IATDGRAT-VALIDITYSTARTDATE, sy-vline,
  WA_IATDGRAT-VALIDITYENDDATE, sy-vline,
  WA_IATDGRAT-ACTIVITYTYPEGROUPNAME, sy-vline,
  WA_IATDGRAT-COSTCTRACTIVITYTYPENAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IATDGRAT 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_IATDGRAT 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_IATDGRAT INTO WA_IATDGRAT.


*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_IATDGRAT_STR, 
MANDT TYPE STRING,
ACTYTYPEWHEREUSEDOBJTYPE TYPE STRING,
SETCLASS TYPE STRING,
SETSUBCLASS TYPE STRING,
UNIVERSALHIERNODEPARENTID TYPE STRING,
COSTCTRACTIVITYTYPE TYPE STRING,
CONTROLLINGAREA TYPE STRING,
VALIDITYSTARTDATE TYPE STRING,
VALIDITYENDDATE TYPE STRING,
ACTIVITYTYPEGROUPNAME TYPE STRING,
COSTCTRACTIVITYTYPENAME TYPE STRING,
COSTCTRACTYTYPEVALDTYSTARTDATE TYPE STRING,
COSTCTRACTYTYPEVALDTYENDDATE TYPE STRING,
ALLOCATIONSETID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IATDGRAT_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_IATDGRAT_STR-MANDT sy-vline 
WA_IATDGRAT_STR-ACTYTYPEWHEREUSEDOBJTYPE sy-vline 
WA_IATDGRAT_STR-SETCLASS sy-vline 
WA_IATDGRAT_STR-SETSUBCLASS sy-vline 
WA_IATDGRAT_STR-UNIVERSALHIERNODEPARENTID sy-vline 
WA_IATDGRAT_STR-COSTCTRACTIVITYTYPE sy-vline 
WA_IATDGRAT_STR-CONTROLLINGAREA sy-vline 
WA_IATDGRAT_STR-VALIDITYSTARTDATE sy-vline 
WA_IATDGRAT_STR-VALIDITYENDDATE sy-vline 
WA_IATDGRAT_STR-ACTIVITYTYPEGROUPNAME sy-vline 
WA_IATDGRAT_STR-COSTCTRACTIVITYTYPENAME sy-vline 
WA_IATDGRAT_STR-COSTCTRACTYTYPEVALDTYSTARTDATE sy-vline 
WA_IATDGRAT_STR-COSTCTRACTYTYPEVALDTYENDDATE sy-vline 
WA_IATDGRAT_STR-ALLOCATIONSETID sy-vline      INTO ld_text SEPARATED BY SPACE.

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