R 中的 ODBC/DBI 不会写入 R 中具有非默认架构的表

Question

问题

当尝试写入具有非默认架构的表时，dbWriteTable在包 DBI 中，写入default.non-default.tablename而不是写入non-default.tablename. 我知道它non-default.tablename存在，因为它出现在我的 SSMS 数据库中。

可重现的例子/我试过的

使用非默认架构“来宾”在 SQL Server 中创建此表。我将它放在一个名为“SAM”的数据库中：

CREATE TABLE guest.MikeTestTable(
[a] [float] NULL,
[b] [float] NULL,
[c] [varchar](255) NULL)

#Create a df to insert into guest.MikeTestTable
df <- data.frame(a = c(10, 20, 30),
                 b = c(20, 40, 60),
                 c = c("oneT", "twoT", "threeT"))

#Create a connection:
con <- DBI::dbConnect(odbc::odbc(),
             .connection_string = "Driver={SQL Server};
                                   server=localhost;
                                   database=SAM;
                                   trustedConnection=true;")

#Try to write contents of df to the table using `dbWriteTable`
DBI::dbWriteTable(conn = con,
                  name = "guest.MikeTestTable",
                  value = df,
                  append = TRUE)

#Create a query to read the data from `"guest.MikeTestTable"`:
q <- "SELECT [a]
  ,[b]
  ,[c]
  FROM guest.MikeTestTable"

##Read the table into R to show that nothing actually got written to the 
##table but that it recognizes `guest.MikeTestTable` does exist:
DBI::dbGetQuery(con, q)

[1] a b c
<0 rows> (or 0-length row.names)

我认为这是一个奇怪的结果，所以我打开了我的 SSMS，瞧，表dbo.guest.MikeTestTable已经创建了。任何帮助将非常感激。

Answer 1

The CRAN release last week (related to the issue @user111417 linked to) resolves this using the new DBI::Id() function, where the schema and table names are separate and explicit. Here's an example.

library(magrittr)
table_id <- DBI::Id(
  schema  = "schema_1",
  table   = "car"
)

ds <- mtcars %>% 
  tibble::rownames_to_column("car")

# Create the Table
channel <- DBI::dbConnect(
  drv   = odbc::odbc(),
  dsn   = "cdw_cache"
)
result <- DBI::dbWriteTable(
  conn        = channel,
  name        = table_id,
  value       = ds,
  overwrite   = T,
  append      = F
)

DBI::dbGetQuery(channel, "SELECT COUNT(*) FROM schema_1.car")
# Produces `1 32`

DBI::dbExistsTable(channel, table_id)
# Produces: [1] TRUE

DBI::dbDisconnect(channel)

(Thanks to Daniel Wood for help in https://github.com/r-dbi/odbc/issues/191.)

Answer 2

请看这里寻找答案