dbReadTable error in R: invalid object name

问题

I've been scouring stackoverflow and google for an hour trying to figure out why my table won't show up. So far solutions that have worked for others, don't work for me.

I'm connecting to a database like this:

library(DBI)
library(dplyr)
con <- dbConnect(odbc::odbc(), .connection_string = "Driver={SQL Server};", 
                 user = rstudioapi::askForPassword("Your computer usename e.g. SmithJo"), 
                 password = rstudioapi::askForPassword("Your computer password (e.g. to login to Windows)"), 
                 port = 1433, 
                server = "myserver", 
                dbname = "MYDB")

Connecting to some tables works:

traptable <- dbReadTable(con, "tblTrap")

And others don't, even though the table exists!

> dbExistsTable(con, "tlkpSampleType")
[1] TRUE

I've included some of the solutions I've tried...

> dbReadTable(con, "tlkpSampleType")
Error: <SQL> 'SELECT * FROM "tlkpSampleType"'
  nanodbc/nanodbc.cpp:1587: 42S02: [Microsoft][ODBC SQL Server Driver][SQL Server]Invalid object name 'tlkpSampleType'. 
> dbReadTable(con, SQL("tlkpSampleType"))
Error: <SQL> 'SELECT * FROM tlkpSampleType'
  nanodbc/nanodbc.cpp:1587: 42S02: [Microsoft][ODBC SQL Server Driver][SQL Server]Invalid object name 'tlkpSampleType'. 
> dbGetQuery(con, "SELECT * FROM tlkpSampleStatus")
Error: <SQL> 'SELECT * FROM tlkpSampleStatus'
  nanodbc/nanodbc.cpp:1587: 42S02: [Microsoft][ODBC SQL Server Driver][SQL Server]Invalid object name 'tlkpSampleStatus'. 
> dbReadTable(con,"MYDB.tlkpSampleStatus")
Error: <SQL> 'SELECT * FROM "MYDB.tlkpSampleStatus"'
  nanodbc/nanodbc.cpp:1587: 42S02: [Microsoft][ODBC SQL Server Driver][SQL Server]Invalid object name 'MYDB.tlkpSampleStatus'. 
> queryResults <- dbGetQuery(con, "SELECT * FROM [MYDB].[abc].[tlkpSampleStatus]")
Error: <SQL> 'SELECT * FROM [MYDB].[abc].[tlkpSampleStatus]'
  nanodbc/nanodbc.cpp:1587: 42S02: [Microsoft][ODBC SQL Server Driver][SQL Server]Invalid object name 'MYDB.abc.tlkpSampleStatus'. 
> dbReadTable(con, Id(schema = "tlkpSampleStatus"))
Error: <SQL> 'SELECT * FROM "tlkpSampleStatus"'
  nanodbc/nanodbc.cpp:1587: 42S02: [Microsoft][ODBC SQL Server Driver][SQL Server]Invalid object name 'tlkpSampleStatus'. 
> dbReadTable(con, Id(schema = "MYDB", table = "tlkpSampleStatus"))
Error: <SQL> 'SELECT * FROM "MYDB"."tlkpSampleStatus"'
  nanodbc/nanodbc.cpp:1587: 42S02: [Microsoft][ODBC SQL Server Driver][SQL Server]Invalid object name 'MYDB.tlkpSampleStatus'. 
> dbGetQuery(con, paste('SELECT * FROM', 'tlkpSampleStatus'))
Error: <SQL> 'SELECT * FROM tlkpSampleStatus'
  nanodbc/nanodbc.cpp:1587: 42S02: [Microsoft][ODBC SQL Server Driver][SQL Server]Invalid object name 'tlkpSampleStatus'. 
> dbReadTable(con, Id(schema = "tlkpSampleStatus", table = "tlkpSampleStatus"))
Error: <SQL> 'SELECT * FROM "tlkpSampleStatus"."tlkpSampleStatus"'
  nanodbc/nanodbc.cpp:1587: 42S02: [Microsoft][ODBC SQL Server Driver][SQL Server]Invalid object name 'tlkpSampleStatus.tlkpSampleStatus'.

回答1:

It's not uncommon for lookup tables to be kept in a different schema than storage tables. Either way, you should qualify your table names with their schema names when you can. E.g.,

>dbReadTable(con, SQL("dbo.tlkpSampleType"))

To see the complete list of tables and their schemas, you could do something like:

1  rs <- dbSendQuery(con, "SELECT SCHEMA_NAME(schema_id) As SchemaName, name As TableName FROM sys.tables;")
2  dbFetch(rs)

From there, you can qualify the tables appropriately for future queries.

回答2:

Same problem here. I did find out that it has to do with the schema of the table. You can list schema by first setting up a channel:

ch = odbcDriverConnect(DSM, Uid, Pwd)

Then run:

tables = sqlTables(ch)

I found out that I can read in tables that have the schema dbo, but not sys.

回答3:

The dbplyr package lets you select which schema to use with the in_schema function. That should do the trick.

library(dbplyr)
con_tlkpSampleStatus <- tbl(con, in_schema("abc", "tlkpSampleStatus"))

来源：https://stackoverflow.com/questions/52209203/dbreadtable-error-in-r-invalid-object-name

标签

sql-server

r-dbi