r - 如何从 tbl_dbi 获取字段名称？

Question

有没有办法直接从tbl_dbi对象中获取字段名称（db_mtcars如下）？

 library(RSQLite)
 library(dbplyr)
 library(dplyr)
 con <- dbConnect(RSQLite::SQLite(), ":memory:")
 dbWriteTable(con, "mtcars", mtcars)

 db_mtcars <- tbl(con, "mtcars")

Answer 1

是的colnames()

> colnames(db_mtcars)
 [1] "mpg"  "cyl"  "disp" "hp"   "drat" "wt"   "qsec" "vs"   "am"   "gear"
[11] "carb"

Answer 2

colnames(db_mtcars)是简单的解决方案，DBI::dbListFields(con, "mtcars")是奇特的解决方案。即使names(db_mtcars)失败，两者都可以工作。