Exception handing in OData

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SAP provided below 2 Interfaces and 2 Classes to handle the exceptions in OData.

/IWBEP/IF_MESSAGE_CONTAINER
/IWBEP/IF_MGW_CONTEXT
/IWBEP/CX_MGW_BUSI_EXCEPTION
/IWBEP/CX_MGW_TECH_EXCEPTION   

Example:
DATA(lo_msg_container) = mo_context->get_message_container( ).
SELECT SINGLE * FROM qals INTO @DATA(ls_qals) WHERE prueflos EQ @iv_prueflos.
 IF sy-subrc NE 0.

METOD 1: Just raise an exception but don't handle it (no parameters)

       RAISE EXCEPTION TYPE /iwbep/cx_mgw_busi_exception. 

The output will be as follows:


Method 2: Using Message Container
raising and handling the exceptions using the interface reference as importing parameter.
      lo_msg_container->add_message_text_only(
        EXPORTING
          iv_msg_type = 'E'
          iv_msg_text = |Inspection Lot { iv_prueflos } is invalid| ).
      RAISE EXCEPTION TYPE /iwbep/cx_mgw_busi_exception
        EXPORTING
          message_container = lo_msg_container.
    ENDIF.



Method 3: BUSINESS_ERROR

Raising and handling the exception using constructor parameters

    RAISE EXCEPTION TYPE /iwbep/cx_mgw_busi_exception
      EXPORTING
        textid  = /iwbep/cx_mgw_busi_exception=>business_error
        message = |Not authorized to access the data|.


Method 4: Textid using /iwbep/cx_mgw_tech_exception class

  RAISE EXCEPTION TYPE /iwbep/cx_mgw_tech_exception
      EXPORTING
        textid     = /iwbep/cx_mgw_busi_exception=>business_error .



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