[ http://issues.apache.org/jira/browse/DERBY-1090?page=all ]
Olav Sandstaa updated DERBY-1090:
---------------------------------
Attachment: embedded1090-isclosed.diff
This patch (embedded1090-isclosed.diff) implementations Connection.isValid()
for the embedded driver by verifying that the connection
is not closed (by calling isClosed()). If the connection is closed, isValid
returns false, otherwise it returns true. The timeout defined as a parameter to
isValid is not used.
Compared to the previous patch I sent a few days ago (embedded1090-query.diff),
this patch does not run any query against Derby to validate the
connection. My proposal (also based on suggestions from Dan) is that we only
check for isClosed() in the embedded driver. I have not experienced any
situation where isClosed returned false and the query failed. If we later
discover situations where the connection is not "valid" even if isValid returns
true, we can add a query as done in my first patch to isValid.
Testing:
The patch extends the TestConnectionMethods.java test with test for isValid in
the following cases:
-wrong parameter values (negative timeout)
-isValid with no timeout
-isValid with a specified timeout
-isValid on a connection that is closed
-isValid on a "open connection" to a database that is shutdown
svn status reports:
M java/engine/org/apache/derby/impl/jdbc/EmbedConnection40.java
M
java/testing/org/apache/derbyTesting/functionTests/tests/jdbc4/TestConnectionMethods.java
I have run the JDBC4 tests using Java 1.6 and derbyall using Java 1.5 under
Solaris 10 x86. Only errors seen in the regression test was reported
(runtimeinfo failed in derbynetmats).
The patch is complete for the embedded driver and can be reviewed and committed.
> Implement Connection.isValid as defined by JDBC4
> ------------------------------------------------
>
> Key: DERBY-1090
> URL: http://issues.apache.org/jira/browse/DERBY-1090
> Project: Derby
> Type: Sub-task
> Components: JDBC
> Reporter: Olav Sandstaa
> Assignee: Olav Sandstaa
> Priority: Minor
> Fix For: 10.2.0.0
> Attachments: embedded1090-isclosed.diff, embedded1090-query.diff
>
> The Javadoc for JDBC4 says this about Connection.isValid:
> boolean isValid(int timeout) throws SQLException
> Returns true if the connection has not been closed and is still valid. The
> driver shall submit a query on the connection or use some other mechanism
> that positively verifies the connection is still valid when this method is
> called.
> The query submitted by the driver to validate the connection shall be
> executed in the context of the current transaction.
> Parameters: timeout - - The time in seconds to wait for the database
> operation used to validate the connection to complete. If the timeout period
> expires before the operation completes, this method returns false. A value of
> 0 indicates a timeout is not applied to the database operation.
> Returns: true if the connection is valid, false otherwise
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