Create a database table in temporary in-memory database.

memdb_frame() works like tibble::tibble(), but instead of creating a new data frame in R, it creates a table in src_memdb().

Usage

memdb_frame(..., .name = unique_table_name())

tbl_memdb(df, name = deparse(substitute(df)))

src_memdb()

Arguments

...

<dynamic-dots> A set of name-value pairs. These arguments are processed with rlang::quos() and support unquote via rlang::!! and unquote-splice via rlang::!!!. Use := to create columns that start with a dot.

Arguments are evaluated sequentially. You can refer to previously created elements directly or using the rlang::.data pronoun. To refer explicitly to objects in the calling environment, use rlang::!! or rlang::.env, e.g. !!.data or .env$.data for the special case of an object named .data.

df

Data frame to copy

name, .name

Name of table in database: defaults to a random name that's unlikely to conflict with an existing table.

Examples

library(dplyr)
df <- memdb_frame(x = runif(100), y = runif(100))
df %>% arrange(x)
#> # Source:     SQL [?? x 2]
#> # Database:   sqlite 3.50.4 [:memory:]
#> # Ordered by: x
#>         x      y
#>     <dbl>  <dbl>
#>  1 0.0110 0.270 
#>  2 0.0372 0.996 
#>  3 0.0478 0.614 
#>  4 0.0587 0.171 
#>  5 0.0626 0.0612
#>  6 0.0743 0.344 
#>  7 0.0805 0.400 
#>  8 0.0939 0.886 
#>  9 0.100  0.502 
#> 10 0.150  0.918 
#> # ℹ more rows
df %>% arrange(x) %>% show_query()
#> <SQL>
#> SELECT `dbplyr_aByGT89T45`.*
#> FROM `dbplyr_aByGT89T45`
#> ORDER BY `x`

mtcars_db <- tbl_memdb(mtcars)
mtcars_db %>% group_by(cyl) %>% summarise(n = n()) %>% show_query()
#> <SQL>
#> SELECT `cyl`, COUNT(*) AS `n`
#> FROM `mtcars`
#> GROUP BY `cyl`