This module defines a database field retrieved by a query.
type value = [ | `Null| `Int of int| `Float of float| `String of string| `Bytes of bytes| `Time of Time.t ]val name : t -> stringname field returns the field name of field.
val null_value : t -> boolnull_value field returns true if the value associated with field is NULL.
val can_be_null : t -> boolcan_be_null field returns true if values of field can assume the NULL value (i.e. the table definition does not specify NOT NULL for this field.
The functions below simplify the unwrapping of OCaml values from fields. They raise Failure if the field is not of the expected type, but this should not be a problem as the type of a field is in all likelyhood known in advance by database users.
val int : t -> intval float : t -> floatval string : t -> stringval bytes : t -> bytesval int_opt : t -> int optionval float_opt : t -> float optionval string_opt : t -> string optionval bytes_opt : t -> bytes option