Caqti_connect_sig.SSourceThe type of a deferred value of type 'a.
Adds a switch argument to the type if relevant for the platform.
Adds environment argument(s) to the type if relevant for the platform.
A stream implementation.
A pool implementation for the current concurrency library.
Shortcut for the connection module when passed as a value.
val connect :
?subst:(Caqti_template.Dialect.t -> Caqti_template.Query.subst) ->
?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 ]) result fiber)
with_stdenv
with_switchconnect 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 :
?subst:(Caqti_template.Dialect.t -> Caqti_template.Query.subst) ->
?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 fiber) ->
('a, 'e) result fiber)
with_stdenvval connect_pool :
?pool_config:Caqti_pool_config.t ->
?post_connect:(connection -> (unit, 'connect_error) result fiber) ->
?subst:(Caqti_template.Dialect.t -> Caqti_template.Query.subst) ->
?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,
[> Caqti_error.load ])
result)
with_stdenv
with_switchconnect_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.