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duckdb() creates or reuses a database instance.

duckdb_shutdown() shuts down a database instance.

Return an adbcdrivermanager::adbc_driver() for use with Arrow Database Connectivity via the adbcdrivermanager package.

dbConnect() connects to a database instance.

dbDisconnect() closes a DuckDB database connection. The associated DuckDB database instance is shut down automatically, it is no longer necessary to set shutdown = TRUE or to call duckdb_shutdown().

Usage

duckdb(
  dbdir = DBDIR_MEMORY,
  read_only = FALSE,
  bigint = "numeric",
  config = list()
)

duckdb_shutdown(drv)

duckdb_adbc()

# S4 method for duckdb_driver
dbConnect(
  drv,
  dbdir = DBDIR_MEMORY,
  ...,
  debug = getOption("duckdb.debug", FALSE),
  read_only = FALSE,
  timezone_out = "UTC",
  tz_out_convert = c("with", "force"),
  config = list(),
  bigint = "numeric"
)

# S4 method for duckdb_connection
dbDisconnect(conn, ..., shutdown = TRUE)

Arguments

dbdir

Location for database files. Should be a path to an existing directory in the file system. With the default (or ""), all data is kept in RAM.

read_only

Set to TRUE for read-only operation. For file-based databases, this is only applied when the database file is opened for the first time. Subsequent connections (via the same drv object or a drv object pointing to the same path) will silently ignore this flag.

bigint

How 64-bit integers should be returned. There are two options: "numeric" and "integer64". If "numeric" is selected, bigint integers will be treated as double/numeric. If "integer64" is selected, bigint integers will be set to bit64 encoding.

config

Named list with DuckDB configuration flags, see https://duckdb.org/docs/configuration/overview#configuration-reference for the possible options. These flags are only applied when the database object is instantiated. Subsequent connections will silently ignore these flags.

drv

Object returned by duckdb()

...

Ignored

debug

Print additional debug information such as queries

timezone_out

The time zone returned to R, defaults to "UTC", which is currently the only timezone supported by duckdb. If you want to display datetime values in the local timezone, set to Sys.timezone() or "".

tz_out_convert

How to convert timestamp columns to the timezone specified in timezone_out. There are two options: "with", and "force". If "with" is chosen, the timestamp will be returned as it would appear in the specified time zone. If "force" is chosen, the timestamp will have the same clock time as the timestamp in the database, but with the new time zone.

conn

A duckdb_connection object

shutdown

Unused. The database instance is shut down automatically.

Value

duckdb() returns an object of class duckdb_driver.

dbDisconnect() and duckdb_shutdown() are called for their side effect.

An object of class "adbc_driver"

dbConnect() returns an object of class duckdb_connection.

Examples

library(adbcdrivermanager)
with_adbc(db <- adbc_database_init(duckdb_adbc()), {
  as.data.frame(read_adbc(db, "SELECT 1 as one;"))
})
#>   one
#> 1   1
drv <- duckdb()
con <- dbConnect(drv)

dbGetQuery(con, "SELECT 'Hello, world!'")
#>   'Hello, world!'
#> 1   Hello, world!

dbDisconnect(con)
duckdb_shutdown(drv)

# Shorter:
con <- dbConnect(duckdb())
dbGetQuery(con, "SELECT 'Hello, world!'")
#>   'Hello, world!'
#> 1   Hello, world!
dbDisconnect(con, shutdown = TRUE)