package caqti-async
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caqti-async
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package caqti-async
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Connector for Async.
module Stream :
Caqti_stream_sig.S with type 'a fiber := 'a Async_kernel.Deferred.tmodule Pool : Caqti_pool_sig.S with type 'a fiber := 'a Async_kernel.Deferred.tmodule type CONNECTION =
Caqti_connection_sig.S
with type 'a fiber := 'a Async_kernel.Deferred.t
and type ('a, 'e) stream := ('a, 'e) Stream.tinclude Caqti_connect_sig.S
with type 'a fiber := 'a Async_kernel.Deferred.t
and type 'a with_switch := 'a
and type 'a with_stdenv := 'a
and type ('a, 'e) stream := ('a, 'e) Stream.t
and type ('a, 'e) pool := ('a, 'e) Pool.t
and type connection = (module CONNECTION)
type connection = (module CONNECTION)Shortcut for the connection module when passed as a value.
val connect :
?env:(Caqti_driver_info.t -> string -> Caqti_query.t) ->
?config:Caqti_connect_config.t ->
?tweaks_version:(int * int) ->
Uri.t ->
(connection, [> Caqti_error.load_or_connect ]) Stdlib.result
Async_kernel.Deferred.tconnect uri locates and loads a driver which can handle uri, passes uri to the driver, which establish a connection and returns a first-class module implementing Caqti_connection_sig.S.
connect uri connects to the database at uri and returns a first class module implementing Caqti_connection_sig.S for the given database system. In case of preemptive threading, the connection must only be used from the thread where it was created.
The correct driver for the database system is inferred from the schema of uri; see the respective drivers for the supported schemas and related URI syntax. A driver can either be linked in to the application or, if supported, dynamically linked using the caqti-dynload package.
val with_connection :
?env:(Caqti_driver_info.t -> string -> Caqti_query.t) ->
?config:Caqti_connect_config.t ->
?tweaks_version:(int * int) ->
Uri.t ->
(connection ->
('a, [> Caqti_error.load_or_connect ] as 'e) Stdlib.result
Async_kernel.Deferred.t) ->
('a, 'e) Stdlib.result Async_kernel.Deferred.tval connect_pool :
?pool_config:Caqti_pool_config.t ->
?post_connect:
(connection ->
(unit, 'connect_error) Stdlib.result Async_kernel.Deferred.t) ->
?env:(Caqti_driver_info.t -> string -> Caqti_query.t) ->
?config:Caqti_connect_config.t ->
?tweaks_version:(int * int) ->
Uri.t ->
((connection, [> Caqti_error.connect ] as 'connect_error) Pool.t,
[> Caqti_error.load ])
Stdlib.resultconnect_pool uri is a pool of database connections constructed by connect uri.
Do not use pooling for connections to volatile resources like sqlite3::memory: and beware of temporary tables or other objects which may not be shared across connections to the same URI.
If you use preemptive threading, note that the connection pool must only be used from the thread where it was created. Use thread local storage to create a separate pool per thread if necessary.