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[英]Using ROracle dbWriteTable to write POSIXct back to Oracle DB
[英]can't write timestamps in PostgreSQL using RPostgres dbWriteTable
我试图写的R tibble
对象(或data.frame
)转换成Postgres
使用数据库RPostgres
包。 根据文档,我尝试使用dbWriteTable
函数。
但是,我意识到该方法中没有field.types
的规范。 在这里,我提供了一个最小的示例,您可以看到当输入具有POSIXct
时间戳时该方法失败(当时间戳被解释为字符时,该方法失败)。
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$password
)
test <- tibble(
words = c("hallo","ja", "nein"),
value = c(3,4,5),
time= as.POSIXct(c("2016-05-04 04:32","2016-06-02 09:37","2016-07-12 10:43")))
test2 <- tibble(
words = c("hallo","ja", "nein"),
value = c(3,4,5),
time= c("2016-05-04 04:32","2016-06-02 09:37","2016-07-12 10:43"))
dbWriteTable(conn = conn, name = "words", value = test)
> Error in eval(substitute(expr), envir, enclos) :
> ERROR: invalid input syntax for type real: "2016-05-04 04:32:00"
> CONTEXT: COPY words, line 1, column time: "2016-05-04 04:32:00"
dbWriteTable(conn = conn, name = "words2", value = test2)
> [1] TRUE
有谁知道使用R
在Postgres
使用时间戳编写表的更好方法吗?
在RPostgreSQL
软件包中使用PostgreSQL
驱动程序是RPostgreSQL
。 另外,第三个时间戳的格式与as.POSIXct的默认格式不匹配-小时的数字过多。 所以我将"2016-07-12 010:43"
更改为"2016-07-12 10:43"
,您应该会发现它工作正常。
library(dplyr)
library(DBI)
library(RPostgreSQL)
library(tibble)
#connect to db
url <- list(user="postgres",password="postgres",dbname="test")
conn <- dbConnect(drv="PostgreSQL", user=url$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]是
dbWriteTable(conn = conn, name = "words2", value = test2)
[1]是
dbDisconnect(conn)
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