| spec_driver_data_type {DBItest} | R Documentation |
spec_driver_data_type
Description
spec_driver_data_type
Value
dbDataType() returns the SQL type that corresponds to the obj argument
as a non-empty
character string.
For data frames, a character vector with one element per column
is returned.
Failure modes
An error is raised for invalid values for the obj argument such as a
NULL value.
Specification
The backend can override the dbDataType() generic
for its driver class.
This generic expects an arbitrary object as second argument.
To query the values returned by the default implementation,
run example(dbDataType, package = "DBI").
If the backend needs to override this generic,
it must accept all basic R data types as its second argument, namely
logical,
integer,
numeric,
character,
dates (see Dates),
date-time (see DateTimeClasses),
and difftime.
If the database supports blobs,
this method also must accept lists of raw vectors,
and blob::blob objects.
As-is objects (i.e., wrapped by I()) must be
supported and return the same results as their unwrapped counterparts.
The SQL data type for factor and
ordered is the same as for character.
The behavior for other object types is not specified.
See Also
Other driver specifications:
spec_driver_connect,
spec_driver_constructor,
spec_get_info