| Portability | portable |
|---|---|
| Stability | experimental |
| Maintainer | Leon P Smith <leon@melding-monads.com> |
Database.PostgreSQL.Simple.Internal
Description
Internal bits. This interface is less stable and can change at any time. In particular this means that while the rest of the postgresql-simple package endeavors to follow the package versioning policy, this module does not. Also, at the moment there are things in here that aren't particularly internal and are exported elsewhere; these will eventually disappear from this module.
- data Field = Field {}
- name :: Field -> Maybe ByteString
- tableOid :: Field -> Oid
- tableColumn :: Field -> Int
- format :: Field -> Format
- typeOid :: Field -> Oid
- data Connection = Connection {
- connectionHandle :: !(MVar Connection)
- connectionObjects :: !(MVar (IntMap ByteString))
- data SqlType
- = Builtin BuiltinType
- | Other Oid
- data SqlError = SqlError {}
- data ConnectInfo = ConnectInfo {}
- defaultConnectInfo :: ConnectInfo
- connect :: ConnectInfo -> IO Connection
- connectPostgreSQL :: ByteString -> IO Connection
- postgreSQLConnectionString :: ConnectInfo -> ByteString
- oid2int :: Oid -> Int
- exec :: Connection -> ByteString -> IO Result
- withConnection :: Connection -> (Connection -> IO a) -> IO a
- close :: Connection -> IO ()
- newNullConnection :: IO Connection
- data RawResult = RawResult {
- rawField :: Field
- rawData :: Maybe ByteString
Documentation
A Field represents metadata about a particular field
You don't particularly want to retain these structures for a long period of time, as they will retain the entire query result, not just the field metadata
name :: Field -> Maybe ByteStringSource
tableColumn :: Field -> IntSource
data Connection Source
Constructors
| Connection | |
Fields
| |
Constructors
| SqlError | |
Fields
| |
data ConnectInfo Source
Constructors
| ConnectInfo | |
Fields
| |
Instances
defaultConnectInfo :: ConnectInfoSource
Default information for setting up a connection.
Defaults are as follows:
- Server on
localhost - Port on
5432 - User
postgres - No password
- Database
postgres
Use as in the following example:
connect defaultConnectInfo { connectHost = "db.example.com" }
connect :: ConnectInfo -> IO ConnectionSource
Connect with the given username to the given database. Will throw an exception if it cannot connect.
connectPostgreSQL :: ByteString -> IO ConnectionSource
Attempt to make a connection based on a libpq connection string. See http://www.postgresql.org/docs/9.1/static/libpq-connect.html for more information.
postgreSQLConnectionString :: ConnectInfo -> ByteStringSource
Turns a ConnectInfo data structure into a libpq connection string.
exec :: Connection -> ByteString -> IO ResultSource
withConnection :: Connection -> (Connection -> IO a) -> IO aSource
Atomically perform an action with the database handle, if there is one.
close :: Connection -> IO ()Source