add event in jdbc exception log instead of statement query. because some jdbc drivers (like oracle jdbc) not implemented toString() method in PreparedStatement class and it print java object hashcode instead of actual query. but in some jdbc implemention like postgresql and mysql and ... this has no problem

lib/logstash/outputs/jdbc.rb

@@ -208,16 +208,14 @@ class LogStash::Outputs::Jdbc < LogStash::Outputs::Base
     end
 
     events.each do |event|
-      query = nil
       begin
         statement = connection.prepareStatement(
           (@unsafe_statement == true) ? event.sprintf(@statement[0]) : @statement[0]
         )
         statement = add_statement_event_params(statement, event) if @statement.length > 1
-        query = statement.toString
         statement.execute
       rescue => e
-        if retry_exception?(e, query)
+        if retry_exception?(e, event.to_json())
           events_to_retry.push(event)
         end
       ensure
@@ -308,16 +306,21 @@ class LogStash::Outputs::Jdbc < LogStash::Outputs::Base
     statement
   end
 
-  def retry_exception?(exception, query)
+  def retry_exception?(exception, event)
     retrying = (exception.respond_to? 'getSQLState' and (RETRYABLE_SQLSTATE_CLASSES.include?(exception.getSQLState.to_s[0,2]) or @retry_sql_states.include?(exception.getSQLState)))
-    log_jdbc_exception(exception, retrying, query)
+    log_jdbc_exception(exception, retrying, event)
 
     retrying
   end
 
-  def log_jdbc_exception(exception, retrying, query)
+  def log_jdbc_exception(exception, retrying, event)
     current_exception = exception
-    log_text = 'JDBC - Exception. ' + (retrying ? 'Retrying' : 'Not retrying') + '.' + ' with query: "' + query + '".'
+    log_text = 'JDBC - Exception. ' + (retrying ? 'Retrying' : 'Not retrying') + '.'
+    
+    if(event != nil)
+        log_text += ' event: "' + event + '".'
+    end
+    
     log_method = (retrying ? 'warn' : 'error')
 
     loop do