OpenDBX::Exception(3)

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

SYNOPSIS

#include <api.hpp>

  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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