These functions are useful for testing SQL generation without having to have an active database connection.

simulate_dbi()

simulate_sqlite()

simulate_postgres()

simulate_mssql()

tbl_lazy(df, src = NULL)

lazy_frame(..., src = NULL)

Examples

library(dplyr) df <- data.frame(x = 1, y = 2) df_sqlite <- tbl_lazy(df, src = simulate_sqlite()) df_sqlite %>% summarise(x = sd(x)) %>% show_query()
#> <SQL> SELECT STDEV(`x`) AS `x` #> FROM `df`