我希望使用Mongo :: Client对象连接到不同的数据库，就像在命令leadrep中一样。
我正在尝试dput，但它正在给我df1 <- structure(list(Year = c(1999, 1999, 1998), Agent = list(c("abn-amro-nv",
"suntrust banks", "wachovia"), c("jp morgan", "abn-amro-nv"),
c("ba-corp", "boston bks", "nbd"))), .Names = c("Year", "Agent"
), row.names = c(NA, -3L), class = "data.frame")
df2 <- structure(list(Rank = 1:3, Arranger = c("jp morgan", "boston-bank",
"suntrust bk"), Share = c(1.2, 1.8, 2.1), Issues = c(7L, 4L,
3L), Year = c(1999L, 1998L, 1999L)), .Names = c("Rank", "Arranger",
"Share", "Issues", "Year"), class = "data.frame", row.names = c(NA,
-3L))