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From Kathey Marsden <kmarsdende...@sbcglobal.net>
Subject Re: [jira] Updated: (DERBY-374) Invalid URL with Derby Client when connecting to Network Server causes protocol exception.
Date Thu, 22 Sep 2005 04:55:30 GMT
Daniel John Debrunner wrote:

>Kathey Marsden wrote:
>>Deepa Remesh wrote:
>>>I am doing the following. In network server, check if a null
>>>connection is returned by InternalDriver. If so, throw "new
>>>SQLException("No suitable driver","08001");" to match behaviour with
>>>embedded driver. The server will use this SQLException to build
>>>RDBAFLRM and SQLCARD and send it to client.
>>>When using embedded driver, this exception gets thrown by
>>>DriverManager.getConnection method.
>>Hi Deepa,
>>That sounds like the correct approach except that we need to localize
>>the message.
>>Since this message comes from the server message file instead of the
>>network server message file,  I think we need to  use  one of the 
>>org.apache.derby.impl.jdbc.Util.generateCsSQLException   methods.
>Is that correct? The error is being thrown by the network server as
>Deepa describes, not the embedded engine. The embedded driver is
>correctly returning null here, it's the network server that needs to
>handle the null.
Yes, I think the idea is that  network server handle the null by
constructing this SQLException to return to the client for the failed
connection which the client could use to determine the problem and
behave appropriately.

In general for any failed connection

    Client Sends  ACCRDB
    Server tries to connect  and  gets null from driver.connect() or
other exception.
    Server sends   RDBAFLRM and appropriate SQLCARD  (SQLException)

For the case where driver.connect() returns null on the server side  we
have to  return an SQLCARD with the RDBAFLRM  that the  client can use 
and  differentiate this special kind of error so it can return null from
its own connect() method.    

 Thinking about it a bit more, perhaps an RDBAFLRM and a  null SQLCARD
would work for that purpose instead of constructing an SQLException to
send with the RDBAFLRM and maybe makes more sense here.  The alternate
method is to go back to expecting the client itself to reject any
unacceptable urls.  Regardless,  probably  the localization is not 
important because the error would never get to the user.


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