Thursday, July 10, 2014

PostgreSQL JDBC Driver version 9_3_1102 released

This is a maintenance release with a few interesting upgrades

Version 9.3-1102 (2014-07-10)

Author:epgrubmair bug #161
    fix copyOut close hanging bug #161 from epgrubmair


    backpatch exception during close of fully read stream from romank0

Author:Christophe Canovas

    Added caching for ResultSetMetaData  complete commit

Author:Elizabeth Chatman
    NullPointerException in AbstractJdbc2DatabaseMetaData.getUDTs

    setNull, setString, setObject may fail if a specified type cannot be transferred in a binary mode #151

    backpatch fix for changing datestyle before copy

    binary transfer fixes new feature -1 for forceBinaryTransfer

Author:Sergey Chernov
    connectTimeout property support backpatch
Author:Naoya Anzai
    fix prepared statement ERROR due to EMPTY_QUERY defined as static.

9.4 jars can also be found on the site 

Thursday, April 17, 2014

PostgreSQL JDBC example with Spring Transactions

Using PostgreSQL JDBC with Spring.

This article came about after a user filed an issue on the JDBC list

The specific issue is that I’m using SimpleJdbcCall.execute() to call the database and getting back a Jdbc4Array. When I then try to do something like Jdbc4Array.getArray() I get a SQL error that can be tracked down to the Jdbc driver trying to use a connection object which has already been closed by the Spring Framework.

The problem is that once you get the array back more work has to be done to get the values out of it. The following code is an example of how to use transactions with spring and PostgreSQL JDBC

Simple interface to get a value out of an array Implementation which does the actual work Note the @Transaction annotation on line 22, this is required to ensure that the connection is not closed after the first call on line 42 without this annotation spring would close the connection and the next line 43 would throw an exception. The constructor line 27 is required for spring to create the implementation and inject the datasource defined in the context Spring context SQL to create function and data Code for this can be found here SpringTransactionExample
Thanks to Michael Miller for the initial code used in this example

Tuesday, March 25, 2014

PostgreSQL Driver now under continuous integration

Continuous Integration is all about being able to push our code-changes to github and instantly find out if our build fails, or to discover if our code-changes fail our prepared tests. 
The last few days I have been testing a continuous integration service provided by the good folks at Travis-CI. Best of all, this continous integration service is free for open source projects!
The build can be found here

Thursday, February 20, 2014

JDBC driver 9.3 version 1101 released today.

Changes are primarily bug fixes

Changelog can be found  here 

Tuesday, February 11, 2014

scp protocol using jsch

Using Jsch to  scp a file to a remote computer I found Jan Pechanec's excellent blog how_the_scp_protocol_works . The one thing I couldn't figure out was how to specify the remote directory. 

Originally I tried using D mode dir to specify the directory. That results in an error.

As you can specify the target directory using scp manually there must have been a way. Turns out it is simple.

Line 43 of scp is String command="scp " + (ptimestamp ? "-p" :"") +" -t "+rfile; 

All that is required is to specify the target dir in the command as follows:

String command="scp " + (ptimestamp ? "-p" :"") +" -t "+targetDir+'/'+rfile;

Sunday, April 28, 2013

Too much cardio ??? Who knew

Well apparently a few people knew. My nutritionist Jumanah Beck had always had a negative view of cardio, but the discussion was a bit out of scope for our nutrition sessions. I came across this article why women should not run which explains very clearly the folly of putting one foot in front of another ad nauseum.

Thursday, November 1, 2012

Pic from the last track day at Mosport. My copilot Bill, really isn't that scared I hope.