Mild fix ups

lib/logstash/outputs/jdbc.rb

@@ -19,7 +19,7 @@ class LogStash::Outputs::Jdbc < LogStash::Outputs::Base
   public
   def register
     @logger.info("Starting up JDBC")
-    require 'java'
+    require "java"
 
     jarpath = File.join(File.dirname(__FILE__), "../../../vendor/jar/jdbc/*.jar")
     @logger.info(jarpath)
@@ -33,15 +33,25 @@ class LogStash::Outputs::Jdbc < LogStash::Outputs::Base
     driver = Object.const_get(@driver_class[@driver_class.rindex('.') + 1, @driver_class.length]).new
     @connection = driver.connect(@connection_string, java.util.Properties.new)
 
-    @logger.debug("JDBC", :connection => @connection)
+    @logger.debug("JDBC", :driver => driver, :connection => @connection)
   end
 
   def receive(event)
     return unless output?(event)
+    return unless @statement.length > 0
+
     statement = @connection.prepareStatement(@statement[0])
-    @statement[1..-1].each_with_index { |i, idx| statement.setString(idx + 1, event.sprintf(i)) }
+    @statement[1..-1].each_with_index { |i, idx| statement.setString(idx + 1, event.sprintf(i)) } if @statement.length > 1
+
     @logger.debug("Sending SQL to server", :event => event, :sql => statement.toString())
+
     statement.executeUpdate()
+    statement.close()
+  end
+
+  def teardown
+    @connection.close()
+    super
   end
 
 end # class LogStash::Outputs::jdbc