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SQLite backend

Source: R/backend-sqlite.R
backend-sqlite.Rd

This backend supports SQLite databases, typically accessed via a SQLiteConnection created by DBI::dbConnect(). Use dialect_sqlite() with lazy_frame() to see simulated SQL without connecting to a live database.

Key differences for this backend are:

  • Uses non-standard LOG() function

  • Date-time extraction functions from lubridate

  • Custom median translation

  • Right and full joins are simulated using left joins

See vignette("translation-function") and vignette("translation-verb") for details of overall translation technology.

Usage

dialect_sqlite()

simulate_sqlite()

Examples

library(dplyr, warn.conflicts = FALSE)

lf <- lazy_frame(a = TRUE, b = 1, c = 2, d = "z", con = dialect_sqlite())
lf |> transmute(x = paste(c, " times"))
#> <SQL>
#> SELECT `c` || ' ' || ' times' AS `x`
#> FROM `df`
lf |> transmute(x = log(b), y = log(b, base = 2))
#> <SQL>
#> SELECT LOG(`b`) AS `x`, LOG(`b`) / LOG(2.0) AS `y`
#> FROM `df`