Connect to Teradata Database using R + DBI library + ODBC

问题

I'm trying to connect to a Teradata Database in R using the DBI library (if it matters I'm on Windows). I can successfully connect using the RODBC library so I know my credentials etc. are correct.

I suspect the issue is:

I am not correctly specifying the authentication mechanism
Wrong driver: instead of using ODBC, perhaps I should be using JDBC?

Background:

First here's my ODBC info if I look it the ODBC Database Source Administrator:

Name = name_name
Driver = Teradata
Name or IP address = address.here.ok
Mechanism = ldap
Username = my_username

Using R 3.5.1 (2018-07-02), RStudio, Windows 10.

What works:

library(RODBC) 
con = odbcConnect(dsn = "name_name"
                  ,uid = rstudioapi::askForPassword("Username")
                  ,pwd = rstudioapi::askForPassword("Password")
                  )

What I've tried with DBI and fails:

library(DBI)

con <- DBI::dbConnect(odbc::odbc()
                      ,driver = "Teradata"
                      ,DBCName = "name_name"
                      ,host   = "address.here.ok"
                      ,uid    = rstudioapi::askForPassword("Database user")
                      ,pwd    = rstudioapi::askForPassword("Database password"))

Error: Error: nanodbc/nanodbc.cpp:950: 28000: [Teradata][ODBC Teradata Driver][Teradata Database] The UserID, Password or Account is Invalid

con <- DBI::dbConnect(odbc::odbc()
                      ,driver = "Teradata"
                      ,DBCName = "name_name"
                      ,host   = "address.here.ok"
                      ,uid    = rstudioapi::askForPassword("Database user")
                      ,pwd    = rstudioapi::askForPassword("Database password")
                      ,MechanismName = "ldap")

Error: Error: nanodbc/nanodbc.cpp:950: 28000: [Teradata][ODBC Teradata Driver][Teradata Database] The UserID, Password or Account is Invalid

I've seen this error in similar situations when the mechanism is not specified correctly (ldap), so maybe MechanismName is wrong?

I know I can say whatever I like in the connection string and no error is raised so if MechanismName is not the correct way to specify the authentication mechanism I will not have an error returned. For example:

con <- DBI::dbConnect(odbc::odbc()
                      ,driver = "Teradata"
                      ,DBCName = "name_name"
                      ,host   = "address.here.ok"
                      ,uid    = rstudioapi::askForPassword("Database user")
                      ,pwd    = rstudioapi::askForPassword("Database password")
                      ,MechanismName = "ldap")
                      ,made_up_input = "I like cats"

gives the error: Error: nanodbc/nanodbc.cpp:950: 28000: [Teradata][ODBC Teradata Driver][Teradata Database] The UserID, Password or Account is Invalid

Thanks in advance.

Edit: got idea to use MechanismName from an issue raised in Git

回答1:

Like R, DBI is C-based and speaks ODBC. If it were Java-based, it would speak JDBC.

I would suggest you test with hard-coded UID and PWD, before using the askForPassword function.

That said, I believe you will succeed with --

DBI::dbConnect(odbc::odbc() 
    ,dsn = "name_name" 
    ,uid = rstudioapi::askForPassword("Username") 
    ,pwd = rstudioapi::askForPassword("Password")
   )

来源：https://stackoverflow.com/questions/54337267/connect-to-teradata-database-using-r-dbi-library-odbc

标签

windows

odbc

teradata

r-dbi