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November 22, 2012 15:36
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Example of connecting to an Oracle database using R and RJDBC
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| # Set JAVA_HOME, set max. memory, and load rJava library | |
| Sys.setenv(JAVA_HOME='/path/to/java_home') | |
| options(java.parameters="-Xmx2g") | |
| library(rJava) | |
| # Output Java version | |
| .jinit() | |
| print(.jcall("java/lang/System", "S", "getProperty", "java.version")) | |
| # Load RJDBC library | |
| library(RJDBC) | |
| # Create connection driver and open connection | |
| jdbcDriver <- JDBC(driverClass="oracle.jdbc.OracleDriver", classPath="lib/ojdbc6.jar") | |
| jdbcConnection <- dbConnect(jdbcDriver, "jdbc:oracle:thin:@//database.hostname.com:port/service_name_or_sid", "username", "password") | |
| # Query on the Oracle instance name. | |
| instanceName <- dbGetQuery(jdbcConnection, "SELECT instance_name FROM v$instance") | |
| print(instanceName) | |
| # Close connection | |
| dbDisconnect(jdbcConnection) |
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Sounds like the Oracle JDBC entropy issue. Take a look at this article