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我正在尝试使用包将 Rtibble对象（或data.frame）写入Postgres数据库RPostgres。按照文档，我正在尝试使用该dbWriteTable功能。

但是，我意识到该方法中没有规范field.types。在这里，我提供了一个最小的示例，您可以在其中看到当输入具有POSIXct时间戳时方法失败（并且在时间戳被解释为字符时传递）。

library(dplyr)
library(DBI)
library(RPostgres)
library(tibble)

conn <- dbConnect(RPostgres::Postgres(),
  host = url$host,
  port = url$port,
  dbname = url$dbname,
  user = url$user,
  password = url$password
)

test <- tibble(
  words = c("hallo","ja", "nein"),
  value = c(3,4,5),
  time= as.POSIXct(c("2016-05-04 04:32","2016-06-02 09:37","2016-07-12 10:43")))
test2 <- tibble(
  words = c("hallo","ja", "nein"),
  value = c(3,4,5),
  time= c("2016-05-04 04:32","2016-06-02 09:37","2016-07-12 10:43"))

dbWriteTable(conn = conn, name = "words", value = test)
> Error in eval(substitute(expr), envir, enclos) :
> ERROR:  invalid input syntax for type real: "2016-05-04 04:32:00"
> CONTEXT:  COPY words, line 1, column time: "2016-05-04 04:32:00"

dbWriteTable(conn = conn, name = "words2", value = test2)
> [1] TRUE

有谁知道在Postgresusing中编写带有时间戳的表的更好方法R？

4

1 回答 1

0

使用包PostgreSQL中的驱动RPostgreSQL程序有效。此外，第三个时间戳的格式与 as.POSIXct 的默认格式不匹配 - 小时数字太多。所以我改为"2016-07-12 010:43"，"2016-07-12 10:43"你应该会发现它工作正常。

library(dplyr)
library(DBI)
library(RPostgreSQL)
library(tibble)

#connect to db    
url <- list(user="postgres",password="postgres",dbname="test")

conn <- dbConnect(drv="PostgreSQL", user=url$user, password=url$password, dbname = url$dbname)


test <- tibble(
  words = c("hallo","ja", "nein"),
  value = c(3,4,5),
  time= as.POSIXct(c("2016-05-04 04:32","2016-06-02 09:37","2016-07-12 10:43")))
test2 <- tibble(
  words = c("hallo","ja", "nein"),
  value = c(3,4,5),
  time= c("2016-05-04 04:32","2016-06-02 09:37","2016-07-12 010:43"))


dbWriteTable(conn = conn, name = "words", value = test)

[1] 对

dbWriteTable(conn = conn, name = "words2", value = test2)

[1] 对

dbDisconnect(conn)
于 2016-10-24T13:00:57.160 回答