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The base exception class is :exc:`.SQLAlchemyError`. Exceptions which are
raised as a result of DBAPI exceptions are all subclasses of
:exc:`.DBAPIError`.
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.. versionadded:: 1.2
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DontWrapMixina8 A mixin class which, when applied to a user-defined Exception class,
will not be wrapped inside of :exc:`.StatementError` if the error is
emitted within the process of executing a statement.
E.g.::
from sqlalchemy.exc import DontWrapMixin
class MyCustomException(Exception, DontWrapMixin):
pass
class MySpecialType(TypeDecorator):
impl = String
def process_bind_param(self, value, dialect):
if value == 'invalid':
raise MyCustomException("invalid!")
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StatementErrorav An error occurred during execution of a SQL statement.
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the specifics of the statement which had an issue.
The wrapped exception object is available in
the :attr:`.orig` attribute.
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DBAPIErrora Raised when the execution of a database operation fails.
Wraps exceptions raised by the DB-API underlying the
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DB-API exception types are wrapped by matching sub-types of SQLAlchemy's
:class:`DBAPIError` when possible. DB-API's ``Error`` type maps to
:class:`DBAPIError` in SQLAlchemy, otherwise the names are identical. Note
that there is no guarantee that different DB-API implementations will
raise the same exception type for any given error condition.
:class:`DBAPIError` features :attr:`~.StatementError.statement`
and :attr:`~.StatementError.params` attributes which supply context
regarding the specifics of the statement which had an issue, for the
typical case when the error was raised within the context of
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The wrapped exception object is available in the
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DB-API implementation specific.
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