Standard type descriptors provided as a submodule for easy inclusion.
The following provides constructors for narrow tuple types; to describe wider tuple types, use nested application.
val unit : unit tA holding no fields. This is used to pass no parameters and as the result for queries which does not return any rows. It can also be nested in tuples, in which case it will not contribute to the total number of fields.
val custom :
encode:('a -> ('b, string) result) ->
decode:('b -> ('a, string) result) ->
'b t ->
'a tcustom ~encode ~decode rep creates a custom type represented by rep, where encode is used to encode parameters into rep and decode is used to decode result rows from rep.
Note. This should be considered experimental and may be revised or removed in a future version.
val bool : bool tA boolean.
val int : int tAn integer.
val int32 : int32 tA 32 bit integer.
val int64 : int64 tA 64 bit integer.
val float : float tA float.
val string : string tAn UTF-8 string. The database should accept UTF-8 if non-ASCII characters are present.
val octets : string tA binary string.
An absolute time with driver-dependent precision. This corresponds to an SQL timestamp type with UTC time zone.
val ptime_span : Ptime.span tA period of time. If the database lacks a dedicated representation, the integer number of seconds is used.