How to connect to Oracle using JRuby & JDBC

Question

First approach: bare metal

require \'java\'
require \'rubygems\'
require \"c:/ruby/jruby-1.2.0/lib/ojdbc14.jar\"  # should be redundant, but tried it anyway
         


        

Answer 1

Have you got the Oracle client installed? you probably need at least the jdbc driver files from the client

Answer 2

and then to use it after creation:

b = con.create_statement
rs=b.execute_query(“select BANNER from SYS.V_$VERSION”)
while(rs.next())
  p rs.getObject(1) # get first column
end
rs.close

and how to deal with oracle timestamps (if column 3 is a timestamp, for example):

>> rs.getObject(3).timestamp_value.to_string
=> “1970-01-01 00:00:01.0″
>> Date.parse(rs.getObject(3).timestamp_value.to_string)
# or you can use time, like
>> as_ruby_time= Date.parse(rs.getObject(3).timestamp_value.to_string).to_time # 1.9 has this method
# or
>> as_ruby_time = Time.at(0) + rs.getObject(3).timestamp_value.get_time

Answer 3

It turns out that my ojdbc14.jar file was corrupt.

Further, the jar file MUST be in the jruby/lib directory. Simply having it on the classpath does not work.

Answer 4

require 'java'

# This require doesn't load the jdbc driver jar into the system class path
require "c:/ruby/jruby-1.2.0/lib/ojdbc14.jar" 

# 2 ways you can load the class (There are probably more)

# 1 ruby syntax for java class name
Java::OracleJdbcDriver::OracleDriver

# 2 Use the thread context class loader
java.lang.Class.forName("oracle.jdbc.driver.OracleDriver", true, java.lang.Thread.currentThread.getContextClassLoader)


url = "jdbc:oracle:thin:@myhost:1521:mydb"
puts "About to connect..."
con = java.sql.DriverManager.getConnection(url, "myuser", "mypassword");
if con
    puts " connection good"
else
    puts " connection failed"
end