Squeal.PostgreSQL.Session.Exception

exceptions

Documentation

data SquealException

Exceptions that can be thrown by Squeal.

Constructors

SQLException SQLState

SQL exception state

ConnectionException Text

LibPQ function connection exception

DecodingException Text Text

decoding exception function and error message

ColumnsException Text Column

unexpected number of columns

RowsException Text Row Row

too few rows, expected at least and actual number of rows

Instances

Eq SquealException

Defined in Squeal.PostgreSQL.Session.Exception

Methods

(==) :: SquealException -> SquealException -> Bool

(/=) :: SquealException -> SquealException -> Bool

Show SquealException

Defined in Squeal.PostgreSQL.Session.Exception

Methods

showsPrec :: Int -> SquealException -> ShowS

show :: SquealException -> String

showList :: [SquealException] -> ShowS

Exception SquealException

Defined in Squeal.PostgreSQL.Session.Exception

Methods

toException :: SquealException -> SomeException

fromException :: SomeException -> Maybe SquealException

displayException :: SquealException -> String

pattern UniqueViolation :: ByteString -> SquealException

A pattern for unique violation exceptions.

pattern CheckViolation :: ByteString -> SquealException

A pattern for check constraint violation exceptions.

pattern SerializationFailure :: ByteString -> SquealException

A pattern for serialization failure exceptions.

pattern DeadlockDetected :: ByteString -> SquealException

A pattern for deadlock detection exceptions.

data SQLState

the state of LibPQ

Constructors

SQLState

Fields

• sqlExecStatus :: ExecStatus
• sqlStateCode :: ByteString

  https://www.postgresql.org/docs/current/static/errcodes-appendix.html

• sqlErrorMessage :: ByteString

Instances

Eq SQLState

Defined in Squeal.PostgreSQL.Session.Exception

Methods

(==) :: SQLState -> SQLState -> Bool

(/=) :: SQLState -> SQLState -> Bool

Show SQLState

Defined in Squeal.PostgreSQL.Session.Exception

Methods

showsPrec :: Int -> SQLState -> ShowS

show :: SQLState -> String

showList :: [SQLState] -> ShowS

data ExecStatus

Constructors

EmptyQuery

The string sent to the server was empty.

CommandOk

Successful completion of a command returning no data.

TuplesOk

Successful completion of a command returning data (such as a SELECT or SHOW).

CopyOut

Copy Out (from server) data transfer started.

CopyIn

Copy In (to server) data transfer started.

CopyBoth

Copy In/Out data transfer started.

BadResponse

The server's response was not understood.

NonfatalError

A nonfatal error (a notice or warning) occurred.

FatalError

A fatal error occurred.

SingleTuple

The PGresult contains a single result tuple from the current command. This status occurs only when single-row mode has been selected for the query.

Instances

Enum ExecStatus

Defined in Database.PostgreSQL.LibPQ

Methods

succ :: ExecStatus -> ExecStatus

pred :: ExecStatus -> ExecStatus

toEnum :: Int -> ExecStatus

fromEnum :: ExecStatus -> Int

enumFrom :: ExecStatus -> [ExecStatus]

enumFromThen :: ExecStatus -> ExecStatus -> [ExecStatus]

enumFromTo :: ExecStatus -> ExecStatus -> [ExecStatus]

enumFromThenTo :: ExecStatus -> ExecStatus -> ExecStatus -> [ExecStatus]

Eq ExecStatus

Defined in Database.PostgreSQL.LibPQ

Methods

(==) :: ExecStatus -> ExecStatus -> Bool

(/=) :: ExecStatus -> ExecStatus -> Bool

Show ExecStatus

Defined in Database.PostgreSQL.LibPQ

Methods

showsPrec :: Int -> ExecStatus -> ShowS

show :: ExecStatus -> String

showList :: [ExecStatus] -> ShowS

catchSqueal

Arguments

:: MonadCatch m

=> m a

-> (SquealException -> m a)

handler

-> m a

Catch SquealExceptions.

handleSqueal

Arguments

:: MonadCatch m

=> (SquealException -> m a)

handler

-> m a

-> m a

Handle SquealExceptions.

trySqueal :: MonadCatch m => m a -> m (Either SquealException a)

Either return a SquealException or a result.

throwSqueal :: MonadThrow m => SquealException -> m a

Throw SquealExceptions.