package caqti
Install
Dune Dependency
Authors
Maintainers
Sources
sha256=ba4dfd5ff94376b5e003f682410b7b3b392c0bbaa0253679fe7671c2e07e895b
sha512=0416807fba620429ee4d64f3a6991238112e0e10dfba9703dced46cf332fd22135a9873007d025441228ce66fb192bf730d4bc776dd2c1a973d7604ab6e789e0
doc/caqti.blocking/Caqti_blocking/index.html
Module Caqti_blockingSource
Blocking API based on the Unix module.
This module implements a blocking API. It is not designed for preemptive threading. That is, connections and connection pools must be created and used within a single thread, and any limitation on multithreading from the driver or client library applies.
You can use a connection pool to cache a single DB connection, additional connections will not be allocated, since usage is serial.
module type CONNECTION =
Caqti_connection_sig.S
with type 'a fiber := 'a
and type ('a, 'e) stream := ('a, 'e) Stream.tinclude Caqti_connect_sig.S
with type 'a fiber := 'a
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)
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 ]) resultconnect 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) result) ->
('a, 'e) resultval connect_pool :
?pool_config:Caqti_pool_config.t ->
?post_connect:(connection -> (unit, 'connect_error) result) ->
?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 ])
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.
Takes Ok x to x and raises Caqti_error.Exn err on Error err.