[jira] Commented: (DERBY-1737) Network Server should check for current open and active connections before shutting down a database

["Daniel John Debrunner (JIRA)" <de...@db.apache.org>]

    [ http://issues.apache.org/jira/browse/DERBY-1737?page=comments#action_12433280 ] 
            
Daniel John Debrunner commented on DERBY-1737:
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I would say this is a request for a new feature and not a bug. Applications may be depending on the current behaviour, adding a new command to do this functionality seems like the right approach.

> Network Server should check for current open and active connections before shutting down a database
> ---------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-1737
>                 URL: http://issues.apache.org/jira/browse/DERBY-1737
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Server
>    Affects Versions: 10.0.2.0
>         Environment: Any
>            Reporter: Rajesh Kartha
>         Attachments: shutdown.sql, shutdown_embed.sql
>
>
> When a database shutdown is issued using the 'shutdown=true'  by a client, the network server does not check for any active
> connections and shuts down the respective database. As a result queries on the active connection start failing.
> I would expect the right behaviour should be to throw an error  mentioning shutdown was not performed since there are open connections
> to the database.
> Here is a sample output:
> ij version 10.2
> ij> connect 'jdbc:derby://localhost:1527/testdb;create=true' as connA;
> ij> drop table t;
> 0 rows inserted/updated/deleted
> ij> create table t (id int);
> 0 rows inserted/updated/deleted
> ij> insert into t values (1);
> 1 row inserted/updated/deleted
> ij> insert into t values (2);
> 1 row inserted/updated/deleted
> ij> select * from t;
> ID
> -----------
> 1
> 2
> 2 rows selected
> --
> --Connection A is still open
> --
> ij> connect 'jdbc:derby://localhost:1527/testdb' as connB;
> ij(CONNB)> insert into t values (3);
> 1 row inserted/updated/deleted
> ij(CONNB)> select * from t;
> ID
> -----------
> 1
> 2
> 3
> 3 rows selected
> --
> -- Should error out saying there are open connections to the database
> --
> ij(CONNB)> connect 'jdbc:derby://localhost:1527/testdb;shutdown=true';
> ERROR 08006: DERBY SQL error: SQLCODE: -1, SQLSTATE: 08006, SQLERRMC: Database 'testdb' shutdown.
> ij(CONNB)> disconnect;
> --
> --Connection A is still open
> --
> ij> show connections;
> CONNA -         jdbc:derby://localhost:1527/testdb;create=true
> No current connection
> --
> --Set connection to connection A
> --
> ij> set connection connA;
> --
> --Try a sql
> --
> ij> select * from t;
> ERROR 58009: A network protocol error was encountered and the connection has been terminated: the requested command encountered an unarchitected and implementation-specific condition for which there was no architected message
> ij>
> This issue kind of exists in embeddded also but since the database was booted in the same JVM,  one can argue there is more control on the connections  made to the database from the current JVM. In embedded the ''shutdown=true'  closes all active connections to the database.
> ij(CONNB)> connect 'jdbc:derby:testdb;shutdown=true';
> ERROR 08006: Database 'testdb' shutdown.
> ij(CONNB)> disconnect;
> --
> -- Shows no current connections after a shutdown
> -- 
> ij> show connections;
> No current connection
> ij> set connection connA;
> IJ ERROR: No connection exists with the name CONNA
> ij> select * from t;
> IJ ERROR: Unable to establish connection
> ij>

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