ABAP Select data from SAP table FDT_TEST_BOOK_P2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP FDT_TEST_BOOK_P2 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 FDT_TEST_BOOK_P2. 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 FDT_TEST_BOOK_P2 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_FDT_TEST_BOOK_P2 TYPE STANDARD TABLE OF FDT_TEST_BOOK_P2,
      WA_FDT_TEST_BOOK_P2 TYPE FDT_TEST_BOOK_P2,
      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: <FDT_TEST_BOOK_P2> TYPE FDT_TEST_BOOK_P2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_FDT_TEST_BOOK_P2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM FDT_TEST_BOOK_P2
  INTO TABLE IT_FDT_TEST_BOOK_P2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FDT_TEST_BOOK_P2
*  INTO TABLE @DATA(IT_FDT_TEST_BOOK_P22).
*--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_FDT_TEST_BOOK_P2 INDEX 1 INTO DATA(WA_FDT_TEST_BOOK_P22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_FDT_TEST_BOOK_P2 ASSIGNING <FDT_TEST_BOOK_P2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FDT_TEST_BOOK_P2>-MANDT = 1.
<FDT_TEST_BOOK_P2>-CARRID = 1.
<FDT_TEST_BOOK_P2>-CONNID = 1.
<FDT_TEST_BOOK_P2>-FLDATE = 1.
<FDT_TEST_BOOK_P2>-BOOKID = 1.

ENDLOOP.

LOOP AT IT_FDT_TEST_BOOK_P2 INTO WA_FDT_TEST_BOOK_P2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FDT_TEST_BOOK_P2-CUSTOMID, sy-vline,
  WA_FDT_TEST_BOOK_P2-CUSTTYPE, sy-vline,
  WA_FDT_TEST_BOOK_P2-SMOKER, sy-vline,
  WA_FDT_TEST_BOOK_P2-LUGGWEIGHT, sy-vline,
  WA_FDT_TEST_BOOK_P2-WUNIT, sy-vline,
  WA_FDT_TEST_BOOK_P2-INVOICE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FDT_TEST_BOOK_P2 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_FDT_TEST_BOOK_P2 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_FDT_TEST_BOOK_P2 INTO WA_FDT_TEST_BOOK_P2.


*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.

*Conversion exit CUNIT, internal->external for field WUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_FDT_TEST_BOOK_P2-WUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FDT_TEST_BOOK_P2-WUNIT.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_FDT_TEST_BOOK_P2_STR, 
MANDT TYPE STRING,
CARRID TYPE STRING,
CONNID TYPE STRING,
FLDATE TYPE STRING,
BOOKID TYPE STRING,
CUSTOMID TYPE STRING,
CUSTTYPE TYPE STRING,
SMOKER TYPE STRING,
LUGGWEIGHT TYPE STRING,
WUNIT TYPE STRING,
INVOICE TYPE STRING,
CLASS TYPE STRING,
FORCURAM TYPE STRING,
FORCURKEY TYPE STRING,
LOCCURAM TYPE STRING,
LOCCURKEY TYPE STRING,
ORDER_DATE TYPE STRING,
COUNTER TYPE STRING,
AGENCYNUM TYPE STRING,
CANCELLED TYPE STRING,
RESERVED TYPE STRING,
PASSNAME TYPE STRING,
PASSFORM TYPE STRING,
PASSBIRTH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FDT_TEST_BOOK_P2_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_FDT_TEST_BOOK_P2_STR-MANDT sy-vline 
WA_FDT_TEST_BOOK_P2_STR-CARRID sy-vline 
WA_FDT_TEST_BOOK_P2_STR-CONNID sy-vline 
WA_FDT_TEST_BOOK_P2_STR-FLDATE sy-vline 
WA_FDT_TEST_BOOK_P2_STR-BOOKID sy-vline 
WA_FDT_TEST_BOOK_P2_STR-CUSTOMID sy-vline 
WA_FDT_TEST_BOOK_P2_STR-CUSTTYPE sy-vline 
WA_FDT_TEST_BOOK_P2_STR-SMOKER sy-vline 
WA_FDT_TEST_BOOK_P2_STR-LUGGWEIGHT sy-vline 
WA_FDT_TEST_BOOK_P2_STR-WUNIT sy-vline 
WA_FDT_TEST_BOOK_P2_STR-INVOICE sy-vline 
WA_FDT_TEST_BOOK_P2_STR-CLASS sy-vline 
WA_FDT_TEST_BOOK_P2_STR-FORCURAM sy-vline 
WA_FDT_TEST_BOOK_P2_STR-FORCURKEY sy-vline 
WA_FDT_TEST_BOOK_P2_STR-LOCCURAM sy-vline 
WA_FDT_TEST_BOOK_P2_STR-LOCCURKEY sy-vline 
WA_FDT_TEST_BOOK_P2_STR-ORDER_DATE sy-vline 
WA_FDT_TEST_BOOK_P2_STR-COUNTER sy-vline 
WA_FDT_TEST_BOOK_P2_STR-AGENCYNUM sy-vline 
WA_FDT_TEST_BOOK_P2_STR-CANCELLED sy-vline 
WA_FDT_TEST_BOOK_P2_STR-RESERVED sy-vline 
WA_FDT_TEST_BOOK_P2_STR-PASSNAME sy-vline 
WA_FDT_TEST_BOOK_P2_STR-PASSFORM sy-vline 
WA_FDT_TEST_BOOK_P2_STR-PASSBIRTH sy-vline      INTO ld_text SEPARATED BY SPACE.

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