ABAP Select data from SAP table FDT_TEST_CUSTOM 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_CUSTOM 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_CUSTOM. 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_CUSTOM 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_CUSTOM TYPE STANDARD TABLE OF FDT_TEST_CUSTOM,
      WA_FDT_TEST_CUSTOM TYPE FDT_TEST_CUSTOM,
      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_CUSTOM> TYPE FDT_TEST_CUSTOM.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FDT_TEST_CUSTOM
*  INTO TABLE @DATA(IT_FDT_TEST_CUSTOM2).
*--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_CUSTOM INDEX 1 INTO DATA(WA_FDT_TEST_CUSTOM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FDT_TEST_CUSTOM>-MANDT = 1.
<FDT_TEST_CUSTOM>-ID = 1.
<FDT_TEST_CUSTOM>-NAME = 1.
<FDT_TEST_CUSTOM>-FORM = 1.
<FDT_TEST_CUSTOM>-STREET = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FDT_TEST_CUSTOM-POSTBOX, sy-vline,
  WA_FDT_TEST_CUSTOM-POSTCODE, sy-vline,
  WA_FDT_TEST_CUSTOM-CITY, sy-vline,
  WA_FDT_TEST_CUSTOM-COUNTRY, sy-vline,
  WA_FDT_TEST_CUSTOM-REGION, sy-vline,
  WA_FDT_TEST_CUSTOM-TELEPHONE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FDT_TEST_CUSTOM 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_CUSTOM 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_CUSTOM INTO WA_FDT_TEST_CUSTOM.


*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 ISOLA, internal->external for field LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_FDT_TEST_CUSTOM-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FDT_TEST_CUSTOM-LANGU.
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_CUSTOM_STR, 
MANDT TYPE STRING,
ID TYPE STRING,
NAME TYPE STRING,
FORM TYPE STRING,
STREET TYPE STRING,
POSTBOX TYPE STRING,
POSTCODE TYPE STRING,
CITY TYPE STRING,
COUNTRY TYPE STRING,
REGION TYPE STRING,
TELEPHONE TYPE STRING,
CUSTTYPE TYPE STRING,
DISCOUNT TYPE STRING,
LANGU TYPE STRING,
EMAIL TYPE STRING,
WEBUSER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FDT_TEST_CUSTOM_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_CUSTOM_STR-MANDT sy-vline 
WA_FDT_TEST_CUSTOM_STR-ID sy-vline 
WA_FDT_TEST_CUSTOM_STR-NAME sy-vline 
WA_FDT_TEST_CUSTOM_STR-FORM sy-vline 
WA_FDT_TEST_CUSTOM_STR-STREET sy-vline 
WA_FDT_TEST_CUSTOM_STR-POSTBOX sy-vline 
WA_FDT_TEST_CUSTOM_STR-POSTCODE sy-vline 
WA_FDT_TEST_CUSTOM_STR-CITY sy-vline 
WA_FDT_TEST_CUSTOM_STR-COUNTRY sy-vline 
WA_FDT_TEST_CUSTOM_STR-REGION sy-vline 
WA_FDT_TEST_CUSTOM_STR-TELEPHONE sy-vline 
WA_FDT_TEST_CUSTOM_STR-CUSTTYPE sy-vline 
WA_FDT_TEST_CUSTOM_STR-DISCOUNT sy-vline 
WA_FDT_TEST_CUSTOM_STR-LANGU sy-vline 
WA_FDT_TEST_CUSTOM_STR-EMAIL sy-vline 
WA_FDT_TEST_CUSTOM_STR-WEBUSER sy-vline      INTO ld_text SEPARATED BY SPACE.

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