从 R 连接到 amazon redshift 时出错 - windows 10

Question

当使用 JDBC 函数将 R 连接到 amazon redshift（我使用的是 windows 10）时，出现以下错误：

Error in .jfindClass(as.character(driverClass)[1]) : class not found

我运行的代码是

install.packages("rJava")
install.packages("RJDBC")
library(rJava)
library(RJDBC)

download.file('http://s3.amazonaws.com/redshift-downloads/drivers/RedshiftJDBC41-1.1.13.1013.jar','RedshiftJDBC41-1.1.13.1013.jar')
driver <- JDBC("com.amazon.redshift.jdbc41.Driver", "RedshiftJDBC41-1.1.13.1013.jar", identifier.quote = "`")

为了获得有关错误的更多信息，我运行了这个：

 .jclassLoader()$setDebug(1L)

完整的错误跟踪是：

RJavaClassLoader: added 'RedshiftJDBC41-1.1.13.1013.jar' to the URL class path loader
RJavaClassLoader: adding Java archive file 'RedshiftJDBC41-1.1.13.1013.jar' to the internal class path
RJavaClassLoader: added 'C:/Users/user/Documents/R/win-library/3.2/RJDBC/java/RJDBC.jar' to the URL class path loader
RJavaClassLoader: adding Java archive file 'C:/Users/user/Documents/R/win-library/3.2/RJDBC/java/RJDBC.jar' to the internal class path
RJavaClassLoader@33909752.findClass(com.amazon.redshift.jdbc41.Driver)
 - URL loader did not find it: java.lang.ClassNotFoundException: com.amazon.redshift.jdbc41.Driver
RJavaClassLoader.findClass("com.amazon.redshift.jdbc41.Driver")
 - trying class path "C:\Users\user\Documents\R\win-library.2\rJava\java"
 Directory, can get 'C:\Users\user\Documents\R\win-library.2\rJava\java\com\amazon\redshift\jdbc41\Driver.class'? NO
 - trying class path "C:\Users\user\Documents\R\win-library.2\RJDBC\java\RJDBC.jar"
JAR file, can get 'com/amazon/redshift/jdbc41/Driver'? NO
- trying class path "C:\Users\user\Desktop\Pricing"
   Directory, can get 'C:\Users\user\Desktop\Pricing\com\amazon\redshift\jdbc41\Driver.class'? NO
- trying class path "C:\Users\user\Desktop\Pricing\RedshiftJDBC41-1.1.9.1009.jar"
JAR file, can get 'com/amazon/redshift/jdbc41/Driver'? NO
- trying class path "RedshiftJDBC41-1.1.9.1009.jar"
JAR file, can get 'com/amazon/redshift/jdbc41/Driver'? NO
- trying class path "." Directory, can get '.\com\amazon\redshift\jdbc41\Driver.class'? NO
- trying class path "C:\RedshiftJDBC41-1.1.9.1009.jar"
JAR file, can get 'com/amazon/redshift/jdbc41/Driver'? NO
- trying class path "RedshiftJDBC41-1.1.13.1013.jar"
JAR file, can get 'com/amazon/redshift/jdbc41/Driver'? NO
>> ClassNotFoundException

如果您有任何想法可以提供帮助，那就太棒了！谢谢

Answer 1

我对您的建议是将 redshift 与 RPostgreSQL 包连接。

install.packages("RPostgreSQL")
library(RPostgreSQL)
drv <- dbDriver("PostgreSQL")
conn <-dbConnect(drv,host='host link',port='5439',dbname='dbname',user='xxx',password='yyy')
dbSendQuery(conn,"insert your query")

Answer 2

您好，我指的是您的代码

install.packages("rJava") install.packages("RJDBC") 图书馆（rJava）图书馆（RJDBC）

download.file('http://s3.amazonaws.com/redshift-downloads/drivers/RedshiftJDBC41-1.1.13.1013.jar','RedshiftJDBC41-1.1.13.1013.jar') driver <- JDBC("com.amazon.redshift.jdbc41.Driver", "RedshiftJDBC41-1.1.13.1013.jar", identifier.quote = "`")

你写驱动对象的地方，语法是

driver <- JDBC("CLASSNAME","PATH WHERE REDSHIFT JAR FILE IS DOWNLOADED')

我有同样的错误，一旦我意识到我必须放置正确的路径，我就可以连接了。我对 JDBC 的第二个论点是 'C:\Users\person.name\Downloads\RedshiftJDBC41-1.1.13.1013.jar'

希望对您有所帮助

Answer 3

完全相同的问题影响了我。出于某种原因，download.file() 抓取了一个损坏的 .jar。我们小组的开发人员发现了以下修复：

省略：

download.file('http://s3.amazonaws.com/redshift-downloads/drivers/RedshiftJDBC41-1.1.13.1013.jar','RedshiftJDBC41-1.1.13.1013.jar')
而是直接从 http://docs.aws.amazon.com/redshift/latest/mgmt/configure-jdbc-connection.html
将 .jar 复制到您的工作目录。
运行剩余代码。

从 R 连接到 amazon redshift 时出错 - windows 10

Error connecting to amazon redshift from R - windows 10

r

rjdbc

amazon-redshift

windows-10