ABAP Select data from SAP table DEMO_CONN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DEMO_CONN
*  INTO TABLE @DATA(IT_DEMO_CONN2).
*--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_DEMO_CONN INDEX 1 INTO DATA(WA_DEMO_CONN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DEMO_CONN>-MANDT = 1.
<DEMO_CONN>-CARRID = 1.
<DEMO_CONN>-CONNID = 1.
<DEMO_CONN>-COUNTRYFR = 1.
<DEMO_CONN>-CITYFROM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DEMO_CONN-AIRPFROM, sy-vline,
  WA_DEMO_CONN-COUNTRYTO, sy-vline,
  WA_DEMO_CONN-CITYTO, sy-vline,
  WA_DEMO_CONN-AIRPTO, sy-vline,
  WA_DEMO_CONN-FLTIME, sy-vline,
  WA_DEMO_CONN-DEPTIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DEMO_CONN 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_DEMO_CONN 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_DEMO_CONN INTO WA_DEMO_CONN.


*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 SDURA, internal->external for field FLTIME
CALL FUNCTION 'CONVERSION_EXIT_SDURA_OUTPUT'
  EXPORTING
    input =                      WA_DEMO_CONN-FLTIME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DEMO_CONN-FLTIME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field DISTID
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_DEMO_CONN-DISTID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DEMO_CONN-DISTID.
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_DEMO_CONN_STR, 
MANDT TYPE STRING,
CARRID TYPE STRING,
CONNID TYPE STRING,
COUNTRYFR TYPE STRING,
CITYFROM TYPE STRING,
AIRPFROM TYPE STRING,
COUNTRYTO TYPE STRING,
CITYTO TYPE STRING,
AIRPTO TYPE STRING,
FLTIME TYPE STRING,
DEPTIME TYPE STRING,
ARRTIME TYPE STRING,
DISTANCE TYPE STRING,
DISTID TYPE STRING,
FLTYPE TYPE STRING,
FLDATE TYPE STRING,
PRICE TYPE STRING,
CURRENCY TYPE STRING,
PLANETYPE TYPE STRING,
SEATSMAX TYPE STRING,
SEATSOCC TYPE STRING,
PAYMENTSUM TYPE STRING,
MARK TYPE STRING,
NUM_FIELD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DEMO_CONN_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_DEMO_CONN_STR-MANDT sy-vline 
WA_DEMO_CONN_STR-CARRID sy-vline 
WA_DEMO_CONN_STR-CONNID sy-vline 
WA_DEMO_CONN_STR-COUNTRYFR sy-vline 
WA_DEMO_CONN_STR-CITYFROM sy-vline 
WA_DEMO_CONN_STR-AIRPFROM sy-vline 
WA_DEMO_CONN_STR-COUNTRYTO sy-vline 
WA_DEMO_CONN_STR-CITYTO sy-vline 
WA_DEMO_CONN_STR-AIRPTO sy-vline 
WA_DEMO_CONN_STR-FLTIME sy-vline 
WA_DEMO_CONN_STR-DEPTIME sy-vline 
WA_DEMO_CONN_STR-ARRTIME sy-vline 
WA_DEMO_CONN_STR-DISTANCE sy-vline 
WA_DEMO_CONN_STR-DISTID sy-vline 
WA_DEMO_CONN_STR-FLTYPE sy-vline 
WA_DEMO_CONN_STR-FLDATE sy-vline 
WA_DEMO_CONN_STR-PRICE sy-vline 
WA_DEMO_CONN_STR-CURRENCY sy-vline 
WA_DEMO_CONN_STR-PLANETYPE sy-vline 
WA_DEMO_CONN_STR-SEATSMAX sy-vline 
WA_DEMO_CONN_STR-SEATSOCC sy-vline 
WA_DEMO_CONN_STR-PAYMENTSUM sy-vline 
WA_DEMO_CONN_STR-MARK sy-vline 
WA_DEMO_CONN_STR-NUM_FIELD sy-vline      INTO ld_text SEPARATED BY SPACE.

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