NAME

       OpenDBX::Exception - Exceptions thrown by the OpenDBX classes.

SYNOPSIS

       Inherits std::runtime_error.

   Public Member Functions
       Exception (const string &msg, int err, int type)  throw ()
           Initializes the exception object.
       int getCode () const  throw ()
           Returns the OpenDBX error code related to the error.
       int getType () const  throw ()
           Returns severity indicator.

Detailed Description

       Exceptions thrown by the OpenDBX classes.

       Most calls to methods of OpenDBX objects does throw an exception in case an error occurs
       in the underlying database library. Additionally to other exceptions which inherit from
       the STL exception class it will not only contain a translated error message depending on
       the user settings but also a machine readable error code and an indicator for the severity
       of the eror.

       Author
           Norbert Sendetzky norbert@linuxnetworks.de

       Version
           1.0

Constructor & Destructor Documentation

   OpenDBX::Exception::Exception (const string & msg, int err, int type)
       Initializes the exception object. The first parameter, the error message, should be the
       human readable description of what has gone wrong. It should also be already translated to
       the language of the user which depends on his environment settings when e.g GNU gettext is
       used. Errors thrown by the OpenDBX C++ library are already translated.

       The OpenDBX error code is the machine readable code for the error which has been occured.

       The last parameter must be a value indicating the severity of the thrown error. If the
       value is smaller than zero, the error is fatal and the connection to the database can't be
       recovered and has to be closed and reopened before the application can try to continue. In
       case it's greater than zero, the operation failed but the database connection is still
       usable. Zero represents a successful operation and shouldn't be used because an exception
       should only be thrown in error conditions.

       Parameters
           msg Human readable error message
           err OpenDBX error code
           type Severity of error (negative: fatal, zero: success, positive: warning)

       Returns
           Exception

Member Function Documentation

   int OpenDBX::Exception::getCode () const
       Returns the OpenDBX error code related to the error. The machine readable code describing
       the error which occured can be used by the application to act differently depending on the
       specific error. Currently defined codes are:

       • ODBX_ERR_SUCCESS
          The operation was successfully completed.

       • ODBX_ERR_BACKEND
          An error occured in the native database library or in the database server.

       • ODBX_ERR_NOCAP
          The capability isn't available in the currently selected backend.

       • ODBX_ERR_PARAM
          One of the given parameters is invalid and doesn't match the expectations.

       • ODBX_ERR_NOMEM
          An out of memory condition occured.

       • ODBX_ERR_SIZE
          The internally allocated memory is unable to store the value.

       • ODBX_ERR_NOTEXIST
          The backend library wasn't found or loading the library failed.

       • ODBX_ERR_NOOP
          The required function isn't available or the operation isn't possible in this backend.

       • ODBX_ERR_OPTION
          The given option is unknown an therefore invalid.

       • ODBX_ERR_OPTRO
          The requested option is read-only and its value can't be changed.

       • ODBX_ERR_OPTWR
          Setting the given option to the new value failed.

       • ODBX_ERR_RESULT
          Waiting for the result set after sending a statement to the database server failed.

       • ODBX_ERR_NOTSUP
          The requested functionality isn't supported by the backend.

       • ODBX_ERR_HANDLE
          The internal data structure which should store the details for accessing the database
         are invalid.

       Returns
           Error code

   int OpenDBX::Exception::getType () const
       Returns severity indicator. The returned value classifies the error thrown. In case it is
       negative, the error is fatal (e.g. the connection to the database is lost) and the
       application can't continue without closing and reopening the connection.

       If the value is positive, the database wasn't able to perform the requested action but the
       connection is still OK and can be used to send more requests to the database. On zero,
       everything was successfull and no error occured. This shouldn't happen when catching one
       of these exceptions.

       Returns
           Severity of error (negative: fatal, zero: success, positive: warning)

Author

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