test_data_type: test_data_type

In DBItest: Testing DBI Backends

test_data_type

Description

test_data_type

Usage

test_data_type(ctx, dbObj)

Arguments

ctx, dbObj

Arguments to internal test function

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.

DBItest documentation built on June 22, 2024, 11:55 a.m.