ABAP Field Symbol Usage

Here is a short sample which illustrates the usage of field symbols with work areas (headers) . Even though we don't know the number or the name of elements in a work area , we can dynamically get them like below. Field symbols are indispensable for complicated applications or reports. Also they could provide a solution for performance issues in some cases. Beside the usage below there are much more ways to use it. For more information just check out the documentation in sdn.

FIELD-SYMBOLS :  TYPE ANY ,

                 TYPE ANY .

DATA : t_table TYPE TABLE OF pa0001 WITH HEADER LINE.

SELECT * FROM pa0001 INTO TABLE t_table UP TO 100 ROWS.

LOOP AT t_table ASSIGNING  .

WRITE : /.

  " Loop at fields

  DO.

    ASSIGN COMPONENT sy-index OF STRUCTURE  TO .

    IF sy-subrc EQ 0.

      WRITE : .

    ELSE.

      EXIT.

    ENDIF.

  ENDDO.

ENDLOOP.

Basic ABAP HTTP Request Sample

For various needs using http requests could be a life saver. Here is a simple code snippet.

  data : lv_value type string.

  data : http_client type ref to if_http_client .

  data : lv_url type string.

  data : return type string.

    data : lv_err_string type string ,

           lv_ret_code type sy-subrc .

* Build Url

  concatenate 'http://www.example.com/?param='

               lv_value

               into lv_url.

* Create Client 

  call method cl_http_client=>create_by_url

    exporting

      url    = lv_url

    importing

      client = http_client.

* Send 

  call method http_client->send

    exceptions

      http_communication_failure = 1

      http_invalid_state         = 2.

* Receive

  call method http_client->receive

    exceptions

      http_communication_failure = 1

      http_invalid_state         = 2

      http_processing_failed     = 3.

  if sy-subrc ne 0.

    http_client->response->get_status(

      importing

        code   = lv_ret_code

        reason = lv_err_string

           ).

    message lv_err_string type 'I'.

  endif.

* Now we have the response , parse , display  

* do what you like 

  return = http_client->response->get_cdata( ).