|Defines the types of database columns, and functions
for converting these between HSQL and internal formats
|The type and nullable flag of a database column
|A database column type
|Class which retrieves a field description from a given type.
Instances are provided for most concrete types. Instances
for Maybe automatically make the field nullable, and instances
for all (Expr a) types where a has an ExprType instance allows
type information to be recovered from a given column expression.
|Class which returns a list of field descriptions. Gets the
descriptions of all columns in a Record/query. Most useful when
the columns associated with each field in a (Rel r) type must be
recovered. Note that this occurs at the type level only and no
values are inspected.
|Given a query, returns a list of the field names and their
types used by the query. Useful for recovering field information
once a query has been built up.
|Produced by Haddock version 2.6.0|