odbcDataType: Return the corresponding ODBC data type for an R object

In odbc: Connect to ODBC Compatible Databases (using the DBI Interface)

Return the corresponding ODBC data type for an R object

Description

This is used when creating a new table with dbWriteTable(). Databases with default methods defined are

• MySQL

• PostgreSQL

• SQL Server

• Oracle

• SQLite

• Spark

• Hive

• Impala

• Redshift

• Vertica

• BigQuery

• Teradata

• Access

Usage

odbcDataType(con, obj, ...)

Arguments

con	A driver connection object, as returned by dbConnect().
obj	An R object.
...	Additional arguments passed to methods.

Details

If you are using a different database and dbWriteTable() fails with a SQL parsing error the default method is not appropriate, you will need to write a new method.

Value

Corresponding SQL type for the obj.

Defining a new dbDataType method

The object type for your connection will be the database name retrieved by dbGetInfo(con)$dbms.name. Use the documentation provided with your database to determine appropriate values for each R data type. An example method definition of a fictional foo database follows.

con <- dbConnect(odbc::odbc(), "FooConnection")
dbGetInfo(con)$dbms.name
#> [1] "foo"

`odbcDataType.foo <- function(con, obj, ...) {
  switch_type(obj,
    factor = "VARCHAR(255)",
    datetime = "TIMESTAMP",
    date = "DATE",
    binary = "BINARY",
    integer = "INTEGER",
    double = "DOUBLE",
    character = "VARCHAR(255)",
    logical = "BIT",
    list = "VARCHAR(255)",
    stop("Unsupported type", call. = FALSE)
  )
}

odbc documentation built on July 9, 2023, 7:04 p.m.