DAO(Data Access Object)数据库程序接口的异常类案例

看看HP vertica的python DAO定义的教科书级别的异常类吧

【1】class Error(Exception):class Warning(Exception):class InterfaceError(Error):class DatabaseError(Error):【2】class InternalError(DatabaseError):class OperationalError(DatabaseError):class ProgrammingError(DatabaseError):class IntegrityError(DatabaseError):class DataError(DatabaseError):class NotSupportedError(DatabaseError):【3】其他错误类型class TimedOutError(OperationalError):class ConnectionError(DatabaseError):class SSLNotSupported(ConnectionError):class MessageError(InternalError):class EmptyQueryError(ProgrammingError):class QueryError(ProgrammingError):【4】其他错误class LockFailure(QueryError):class InsufficientResources(QueryError):class OutOfMemory(QueryError):class VerticaSyntaxError(QueryError):class MissingSchema(QueryError):class MissingRelation(QueryError):class MissingColumn(QueryError):class CopyRejected(QueryError):class PermissionDenied(QueryError):class InvalidDatetimeFormat(QueryError):class DuplicateObject(QueryError):class QueryCanceled(QueryError):【6】编号定义QUERY_ERROR_CLASSES = {b'55V03': LockFailure,b'53000': InsufficientResources,b'53200': OutOfMemory,b'42601': VerticaSyntaxError,b'3F000': MissingSchema,b'42V01': MissingRelation,b'42703': MissingColumn,b'22V04': CopyRejected,b'42501': PermissionDenied,b'22007': InvalidDatetimeFormat,b'42710': DuplicateObject,b'57014': QueryCanceled}

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