Question

我想通过R.从SQL数据库导入数据。我尝试了太多次（差不多6小时）连接到服务器。我运行了这些命令并显示错误： -

jdbcDriver＆lt; - JDBC（driverClass =＆＃34; oracle.jdbc.OracleDriver＆＃34;，classPath =＆＃34; ojdbc6.jar＆＃34;）

jdbcConnection＆lt; - dbConnect（jdbcDriver，＆＃34; jdbc：oracle：thin：@ // database.desktop-65l5f3s：1521 / orcl＆＃34;，＆＃34; username＆＃34;，＆＃34;密码＆＃34）   .jcall中的错误（drv @ jdrv，＆＃34; Ljava / sql / Connection;＆＃34;，＆＃34; connect＆＃34;，as.character（url）[1]，：     java.sql.SQLRecoverableException：IO错误：指定了未知主机

我认为有驱动程序问题，但我无法解决。

Answer 1

下面是我将R连接到Oracle数据库的方法

下载Oracle驱动程序JDK http://www.oracle.com/technetwork/java/javase/downloads/index.html
安装RJDBC

然后在r中运行下面的代码

library(RJDBC)
## Loading required package: DBI
## Loading required package: rJava
# specify the driver type and location in your machine

jdbcDriver = JDBC("oracle.jdbc.OracleDriver",
                  classPath="C:/app/techsupport/product/11.2.0/client_1/jdbc/lib/ojdbc6.jar") # may be different on your machine, it's based on your JDK installation

# connect to the database

conn = dbConnect(jdbcDriver, "jdbc:oracle:thin:@//database.hostname.com:port/service_name",  # get the database name, port, and service name from you DBA
             user = YourUserName,
             password = YourPassword)

# get office table using a query string

startTime <- Sys.time() # start timer
OfficeTable = dbGetQuery(conn, "select * from office")
# disconnect after working with database
dbDisconnect(conn)
## [1] TRUE
Sys.time() - startTime  # calc time to import table
## Time difference of 0.1630161 secs
# take a look at the data
str(OfficeTable)
## 'data.frame':    373 obs. of  22 variables:

通过R连接到oracle 10g数据库

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