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Date: Wed, 21 Sep 2005 03:00:32 +0200 (CEST)
From: "Kathey Marsden (JIRA)" <derby-dev@db.apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Commented: (DERBY-149) Server hang when invalid string is
 bound to datetime columns.
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    [ http://issues.apache.org/jira/browse/DERBY-149?page=comments#action_12330055 ] 

Kathey Marsden commented on DERBY-149:
--------------------------------------

Looking at this problem, I see that other types of errors, such as insert of a null value into a not null column seem to work ok. Looking at two types of errors in the trace,  I see the following.

SUCCESSFUL ERROR PROCESSING (invalid insert of null value. handled ok)
[derby]        SEND BUFFER: EXCSQLSTT             
[derby]        SEND BUFFER: SQLDTA       
[derby]        SEND BUFFER: RDBCMM      
[derby]        RECEIVE BUFFER: SQLCARD (With error 23502)
[derby]        RECEIVE BUFFER: ENDUOWRM  
[derby]        RECEIVE BUFFER: SQLCARD   (null SQLCARD)


PROBLEM  ERROR PROCESSING (invalid conversion)

[derby]        SEND BUFFER: EXCSQLSTT  
[derby]        SEND BUFFER: SQLDTA   
[derby]        SEND BUFFER: RDBCMM  
[derby]        RECEIVE BUFFER: SQLCARD (Exception 22007)

In the  problem  case, the server never sends the ENDUOWRM and SQLCARD that it should. The client blocks waiting for a response to its chained RDBCMM which the server never sent.

In the server, in parseSQLDTA on exception, we call skipRemainder(false) to skip the rest of the DSS. The false parameter  means it will skip DSS's even if they have a different correlation id, which means in this case it gets a little too skippy and skips the RDBCMM Command.

Changing the line to skipRemainder(true) fixes the problem and makes sense to me because the DRDA manual seems to indicate that you should only get a new correlation identifier for a new command (page 76).   

My specific question (at last)  is this:

Are there any situations where we might need to skip a DSS with a different correlation ID  when parsing the parameters in parseSQLDTA?  


> Server hang when invalid string is bound to datetime columns.
> -------------------------------------------------------------
>
>          Key: DERBY-149
>          URL: http://issues.apache.org/jira/browse/DERBY-149
>      Project: Derby
>         Type: Bug
>   Components: Network Server
>  Environment: Derby running with Network Server via JDBC universal driver.
>     Reporter: A B
>     Assignee: Kathey Marsden

>
> When running against Derby Network Server with the JCC driver, attempts to bind an invalid date/time string to a date/time/timestamp parameter lead to a hang in either the JCC client or in the Network Server (not sure which).
> The problem does NOT occur if the same thing is run against a DB2 server, which suggests the bug is in Network Server, not in the JCC driver.  That said, though, the problem also does NOT happen if one uses an ODBC client to connect to Network Server, instead of a JDBC client--so perhaps it's a problem with JCC, after all...hard to say one way or the other...
> Here's a simple program to reproduce the problem:
> import java.sql.*;
> public class go {
> 	public static void main (String[] args) throws Exception {
> 		Class.forName("com.ibm.db2.jcc.DB2Driver");
> 		Connection c = DriverManager.getConnection(
> 			"jdbc:derby:net://localhost:1527/ugh;create=true", "bah", "humbug");
> 		Statement s = c.createStatement();
> 		try {
> 			s.execute("drop table dt");
> 		} catch (SQLException se) {}
> 		s.execute("create table dt (d date)");
> 		PreparedStatement pSt = c.prepareStatement("insert into dt values (?)");
> 		try {
> 			pSt.setString(1, "oops"); // invalid date value.
> 			pSt.execute();
> 		} catch (SQLException se) {
> 			System.out.println("Got " + se.getSQLState() + ": " + se.getMessage());
> 		}
> 	}
> }
> Of course, in order for the program to run, one must start the Network Server on port 1527 first.

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