Safe Haskell	None
Language	Haskell2010

Database.DuckDB.Simple.FromRow

Contents

Row parsing
Generic derivation
Error conversion

Description

Synopsis

data RowParser a
field :: FromField a => RowParser a
fieldWith :: FieldParser a -> RowParser a
numFieldsRemaining :: RowParser Int
parseRow :: RowParser a -> [Field] -> Ok a
class GFromRow (f :: Type -> Type) where
- gFromRow :: RowParser (f p)
class FromRow a where
- fromRow :: RowParser a
resultErrorToSqlError :: Query -> ResultError -> SQLError
rowErrorsToSqlError :: Query -> [SomeException] -> SQLError

Row parsing

data RowParser a Source #

Parser used by FromRow implementations.

Instances

Instances details

Alternative RowParser Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods empty :: RowParser a # (<\|>) :: RowParser a -> RowParser a -> RowParser a # some :: RowParser a -> RowParser [a] # many :: RowParser a -> RowParser [a] #
Applicative RowParser Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods pure :: a -> RowParser a # (<>) :: RowParser (a -> b) -> RowParser a -> RowParser b # liftA2 :: (a -> b -> c) -> RowParser a -> RowParser b -> RowParser c # (>) :: RowParser a -> RowParser b -> RowParser b # (<*) :: RowParser a -> RowParser b -> RowParser a #
Functor RowParser Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods fmap :: (a -> b) -> RowParser a -> RowParser b # (<$) :: a -> RowParser b -> RowParser a #
Monad RowParser Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods (>>=) :: RowParser a -> (a -> RowParser b) -> RowParser b # (>>) :: RowParser a -> RowParser b -> RowParser b # return :: a -> RowParser a #
MonadPlus RowParser Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods mzero :: RowParser a # mplus :: RowParser a -> RowParser a -> RowParser a #

field :: FromField a => RowParser a Source #

Pull the next field and parse it using its FromField instance.

fieldWith :: FieldParser a -> RowParser a Source #

Pull the next field using the provided FieldParser.

numFieldsRemaining :: RowParser Int Source #

Report how many columns remain unread in the current row.

parseRow :: RowParser a -> [Field] -> Ok a Source #

Execute a RowParser against the provided row.

Generic derivation

class GFromRow (f :: Type -> Type) where Source #

Generic derivation helper mirroring sqlite-simple.

Methods

gFromRow :: RowParser (f p) Source #

Instances

Instances details

GFromRow (U1 :: Type -> Type) Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods gFromRow :: RowParser (U1 p) Source #
(GFromRow a, GFromRow b) => GFromRow (a :*: b) Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods gFromRow :: RowParser ((a :*: b) p) Source #
FromField a => GFromRow (K1 i a :: Type -> Type) Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods gFromRow :: RowParser (K1 i a p) Source #
GFromRow a => GFromRow (M1 i c a) Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods gFromRow :: RowParser (M1 i c a p) Source #

class FromRow a where Source #

Types that can be constructed from database rows.

Minimal complete definition

Nothing

Methods

fromRow :: RowParser a Source #

default fromRow :: (Generic a, GFromRow (Rep a)) => RowParser a Source #

Instances

Instances details

FromRow () Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods fromRow :: RowParser () Source #
FromField a => FromRow (Only a) Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods fromRow :: RowParser (Only a) Source #
FromField a => FromRow [a] Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods fromRow :: RowParser [a] Source #
(FromRow a, FromRow b) => FromRow (a :. b) Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods fromRow :: RowParser (a :. b) Source #
(FromField a, FromField b) => FromRow (a, b) Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods fromRow :: RowParser (a, b) Source #
(FromField a, FromField b, FromField c) => FromRow (a, b, c) Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods fromRow :: RowParser (a, b, c) Source #
(FromField a, FromField b, FromField c, FromField d) => FromRow (a, b, c, d) Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods fromRow :: RowParser (a, b, c, d) Source #
(FromField a, FromField b, FromField c, FromField d, FromField e) => FromRow (a, b, c, d, e) Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods fromRow :: RowParser (a, b, c, d, e) Source #
(FromField a, FromField b, FromField c, FromField d, FromField e, FromField f) => FromRow (a, b, c, d, e, f) Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods fromRow :: RowParser (a, b, c, d, e, f) Source #
(FromField a, FromField b, FromField c, FromField d, FromField e, FromField f, FromField g) => FromRow (a, b, c, d, e, f, g) Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods fromRow :: RowParser (a, b, c, d, e, f, g) Source #
(FromField a, FromField b, FromField c, FromField d, FromField e, FromField f, FromField g, FromField h) => FromRow (a, b, c, d, e, f, g, h) Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods fromRow :: RowParser (a, b, c, d, e, f, g, h) Source #
(FromField a, FromField b, FromField c, FromField d, FromField e, FromField f, FromField g, FromField h, FromField i) => FromRow (a, b, c, d, e, f, g, h, i) Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods fromRow :: RowParser (a, b, c, d, e, f, g, h, i) Source #
(FromField a, FromField b, FromField c, FromField d, FromField e, FromField f, FromField g, FromField h, FromField i, FromField j) => FromRow (a, b, c, d, e, f, g, h, i, j) Source #
Instance details Defined in Database.DuckDB.Simple.FromRow Methods fromRow :: RowParser (a, b, c, d, e, f, g, h, i, j) Source #

Error conversion

resultErrorToSqlError :: Query -> ResultError -> SQLError Source #

Convert a ResultError into a user-facing SQLError.

rowErrorsToSqlError :: Query -> [SomeException] -> SQLError Source #

Collapse parser failure diagnostics into an SQLError while preserving the query.