Copyright	(c) 2014 Andreas Meingast <[email protected]>
License	BSD-style
Maintainer	[email protected]
Stability	experimental
Portability	GHC
Safe Haskell	None
Language	Haskell2010

Database.PostgreSQL.Simple.Migration

Contents

Migration actions
Migration types
Migration result actions
Migration result types

Description

A migration library for postgresql-simple.

For usage, see Readme.markdown.

Synopsis

defaultOptions :: MigrationOptions
runMigration :: Connection -> MigrationOptions -> MigrationCommand -> IO (MigrationResult String)
runMigrations :: Connection -> MigrationOptions -> [MigrationCommand] -> IO (MigrationResult String)
sequenceMigrations :: Monad m => [m (MigrationResult e)] -> m (MigrationResult e)
type Checksum = ByteString
data MigrationOptions = MigrationOptions {
- optVerbose :: !Verbosity
- optTableName :: !ByteString
- optLogWriter :: !(Either Text Text -> IO ())
- optTransactionControl :: !TransactionControl
}
data MigrationCommand
- = MigrationInitialization
- | MigrationDirectory FilePath
- | MigrationFile ScriptName FilePath
- | MigrationScript ScriptName ByteString
- | MigrationValidation MigrationCommand
- | MigrationCommands [MigrationCommand]
data MigrationResult a
- = MigrationError a
- | MigrationSuccess
type ScriptName = String
data TransactionControl
data Verbosity
- = Verbose
- | Quiet
getMigrations :: Connection -> IO [SchemaMigration]
getMigrations' :: Connection -> ByteString -> IO [SchemaMigration]
data SchemaMigration = SchemaMigration {
- schemaMigrationName :: ByteString
- schemaMigrationChecksum :: Checksum
- schemaMigrationExecutedAt :: LocalTime
}

Migration actions

defaultOptions :: MigrationOptions Source #

runMigration :: Connection -> MigrationOptions -> MigrationCommand -> IO (MigrationResult String) Source #

Executes migrations using the provided MigrationOptions.

Returns MigrationSuccess if the provided MigrationCommand executes without error. If an error occurs, execution is stopped and a MigrationError is returned.

runMigrations Source #

Arguments

:: Connection	The postgres connection to use
-> MigrationOptions	The options for this migration
-> [MigrationCommand]	The commands to run
-> IO (MigrationResult String)

Execute a sequence of migrations

Returns MigrationSuccess if all of the provided MigrationCommands execute without error. If an error occurs, execution is stopped and the MigrationError is returned.

sequenceMigrations :: Monad m => [m (MigrationResult e)] -> m (MigrationResult e) Source #

Run a sequence of contexts, stopping on the first failure

Migration types

type Checksum = ByteString Source #

The checksum type of a migration script.

data MigrationOptions Source #

Constructors

MigrationOptions
Fields optVerbose :: !Verbosity Verbosity of the library. optTableName :: !ByteString The name of the table that stores the migrations, usually "schema_migrations" optLogWriter :: !(Either Text Text -> IO ()) Logger. `Either` indicates log level, `Left` for an error message and `Right` for an info message. optTransactionControl :: !TransactionControl If/when transactions should be started

data MigrationCommand Source #

MigrationCommand determines the action of the runMigration script.

Constructors

MigrationInitialization	Initializes the database with a helper table containing meta information.
MigrationDirectory FilePath	Executes migrations based on SQL scripts in the provided `FilePath` in alphabetical order.
MigrationFile ScriptName FilePath	Executes a migration based on script located at the provided `FilePath`.
MigrationScript ScriptName ByteString	Executes a migration based on the provided bytestring.
MigrationValidation MigrationCommand	Validates that the provided MigrationCommand has been executed.
MigrationCommands [MigrationCommand]	Performs a series of `MigrationCommand`s in sequence.

Instances

Instances details

Monoid MigrationCommand Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods mempty :: MigrationCommand # mappend :: MigrationCommand -> MigrationCommand -> MigrationCommand # mconcat :: [MigrationCommand] -> MigrationCommand #
Semigroup MigrationCommand Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods (<>) :: MigrationCommand -> MigrationCommand -> MigrationCommand # sconcat :: NonEmpty MigrationCommand -> MigrationCommand stimes :: Integral b => b -> MigrationCommand -> MigrationCommand
Read MigrationCommand Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods readsPrec :: Int -> ReadS MigrationCommand readList :: ReadS [MigrationCommand] readPrec :: ReadPrec MigrationCommand readListPrec :: ReadPrec [MigrationCommand]
Show MigrationCommand Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods showsPrec :: Int -> MigrationCommand -> ShowS show :: MigrationCommand -> String showList :: [MigrationCommand] -> ShowS
Eq MigrationCommand Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods (==) :: MigrationCommand -> MigrationCommand -> Bool (/=) :: MigrationCommand -> MigrationCommand -> Bool
Ord MigrationCommand Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods compare :: MigrationCommand -> MigrationCommand -> Ordering (<) :: MigrationCommand -> MigrationCommand -> Bool (<=) :: MigrationCommand -> MigrationCommand -> Bool (>) :: MigrationCommand -> MigrationCommand -> Bool (>=) :: MigrationCommand -> MigrationCommand -> Bool max :: MigrationCommand -> MigrationCommand -> MigrationCommand min :: MigrationCommand -> MigrationCommand -> MigrationCommand

data MigrationResult a Source #

A sum-type denoting the result of a migration.

Constructors

MigrationError a	There was an error in script migration.
MigrationSuccess	All scripts have been executed successfully.

Instances

Instances details

Foldable MigrationResult Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods fold :: Monoid m => MigrationResult m -> m foldMap :: Monoid m => (a -> m) -> MigrationResult a -> m foldMap' :: Monoid m => (a -> m) -> MigrationResult a -> m foldr :: (a -> b -> b) -> b -> MigrationResult a -> b foldr' :: (a -> b -> b) -> b -> MigrationResult a -> b foldl :: (b -> a -> b) -> b -> MigrationResult a -> b foldl' :: (b -> a -> b) -> b -> MigrationResult a -> b foldr1 :: (a -> a -> a) -> MigrationResult a -> a foldl1 :: (a -> a -> a) -> MigrationResult a -> a toList :: MigrationResult a -> [a] null :: MigrationResult a -> Bool length :: MigrationResult a -> Int elem :: Eq a => a -> MigrationResult a -> Bool maximum :: Ord a => MigrationResult a -> a minimum :: Ord a => MigrationResult a -> a sum :: Num a => MigrationResult a -> a product :: Num a => MigrationResult a -> a
Traversable MigrationResult Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods traverse :: Applicative f => (a -> f b) -> MigrationResult a -> f (MigrationResult b) sequenceA :: Applicative f => MigrationResult (f a) -> f (MigrationResult a) mapM :: Monad m => (a -> m b) -> MigrationResult a -> m (MigrationResult b) sequence :: Monad m => MigrationResult (m a) -> m (MigrationResult a)
Functor MigrationResult Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods fmap :: (a -> b) -> MigrationResult a -> MigrationResult b # (<$) :: a -> MigrationResult b -> MigrationResult a #
Read a => Read (MigrationResult a) Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods readsPrec :: Int -> ReadS (MigrationResult a) readList :: ReadS [MigrationResult a] readPrec :: ReadPrec (MigrationResult a) readListPrec :: ReadPrec [MigrationResult a]
Show a => Show (MigrationResult a) Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods showsPrec :: Int -> MigrationResult a -> ShowS show :: MigrationResult a -> String showList :: [MigrationResult a] -> ShowS
Eq a => Eq (MigrationResult a) Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods (==) :: MigrationResult a -> MigrationResult a -> Bool (/=) :: MigrationResult a -> MigrationResult a -> Bool
Ord a => Ord (MigrationResult a) Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods compare :: MigrationResult a -> MigrationResult a -> Ordering (<) :: MigrationResult a -> MigrationResult a -> Bool (<=) :: MigrationResult a -> MigrationResult a -> Bool (>) :: MigrationResult a -> MigrationResult a -> Bool (>=) :: MigrationResult a -> MigrationResult a -> Bool max :: MigrationResult a -> MigrationResult a -> MigrationResult a min :: MigrationResult a -> MigrationResult a -> MigrationResult a

type ScriptName = String Source #

The name of a script. Typically the filename or a custom name when using Haskell migrations.

data TransactionControl Source #

Determines how transactions are handled. It is recommened to use transaction when running migrations. Certain actions require a transaction per script, if you are doing this use TransactionPerStep. If you want a single transaction for all migrations use TransactionPerRun. If you do not want a transaction, or are using an existing transaction then use NoNewTransaction.

Constructors

NoNewTransaction	No new transaction will be started. Up to the caller to decide if the run is in a transaction or not
TransactionPerRun	Call `withTransaction` once for the entire `MigrationCommand`
TransactionPerStep	Call `withTransaction` once for each step in a `MigrationCommand` (i.e. new transaction per script)

Instances

Instances details

Show TransactionControl Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods showsPrec :: Int -> TransactionControl -> ShowS show :: TransactionControl -> String showList :: [TransactionControl] -> ShowS

data Verbosity Source #

Constructors

Verbose
Quiet

Instances

Instances details

Show Verbosity Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods showsPrec :: Int -> Verbosity -> ShowS show :: Verbosity -> String showList :: [Verbosity] -> ShowS
Eq Verbosity Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods (==) :: Verbosity -> Verbosity -> Bool (/=) :: Verbosity -> Verbosity -> Bool

Migration result actions

getMigrations :: Connection -> IO [SchemaMigration] Source #

Produces a list of all executed SchemaMigrations in the default schema_migrations table

getMigrations' :: Connection -> ByteString -> IO [SchemaMigration] Source #

Produces a list of all executed SchemaMigrations.

Migration result types

data SchemaMigration Source #

A product type representing a single, executed SchemaMigration.

Constructors

SchemaMigration
Fields schemaMigrationName :: ByteString The name of the executed migration. schemaMigrationChecksum :: Checksum The calculated MD5 checksum of the executed script. schemaMigrationExecutedAt :: LocalTime A timestamp without timezone of the date of execution of the script.

Instances

Instances details

Read SchemaMigration Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods readsPrec :: Int -> ReadS SchemaMigration readList :: ReadS [SchemaMigration] readPrec :: ReadPrec SchemaMigration readListPrec :: ReadPrec [SchemaMigration]
Show SchemaMigration Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods showsPrec :: Int -> SchemaMigration -> ShowS show :: SchemaMigration -> String showList :: [SchemaMigration] -> ShowS
Eq SchemaMigration Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods (==) :: SchemaMigration -> SchemaMigration -> Bool (/=) :: SchemaMigration -> SchemaMigration -> Bool
Ord SchemaMigration Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods compare :: SchemaMigration -> SchemaMigration -> Ordering (<) :: SchemaMigration -> SchemaMigration -> Bool (<=) :: SchemaMigration -> SchemaMigration -> Bool (>) :: SchemaMigration -> SchemaMigration -> Bool (>=) :: SchemaMigration -> SchemaMigration -> Bool max :: SchemaMigration -> SchemaMigration -> SchemaMigration min :: SchemaMigration -> SchemaMigration -> SchemaMigration
FromRow SchemaMigration Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods fromRow :: RowParser SchemaMigration #
ToRow SchemaMigration Source #
Instance details Defined in Database.PostgreSQL.Simple.Migration Methods toRow :: SchemaMigration -> [Action] #