Re: JDBC transaction isolation

From:

=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>

Newsgroups:

comp.lang.java.programmer

Date:

Thu, 03 May 2012 15:00:20 -0400

Message-ID:

<4fa2d5c7$0$288$14726298@news.sunsite.dk>

On 5/3/2012 2:43 PM, markspace wrote:

On 5/3/2012 8:53 AM, Arne Vajh?j wrote:

You let the database do it - not the driver.

Yes, OK. Driver/DB thing. At some lower level than my app.

It is a classic database topic.

Hmm, I'll try to find some other sources then, if it's a general topic
and not restricted to JDBC implementations.

It is not.

ADO.NET has it at provider level:

http://msdn.microsoft.com/en-us/library/system.data.isolationlevel.aspx

Almost all database have it at the SQL level:

http://dev.mysql.com/doc/refman/5.5/en/set-transaction.html
http://www.postgresql.org/docs/9.1/static/sql-set-transaction.html and
http://www.postgresql.org/docs/9.1/static/transaction-iso.html
http://msdn.microsoft.com/en-us/library/ms173763.aspx
http://docs.oracle.com/cd/B10500_01/server.920/a96524/c21cnsis.htm

The code is good in the sense that it will prevent duplicates.

For more serious usage you should consider to retry a couple of times
in case of a transaction timeout.

Ah, ok. Something else to check into. Thanks!

Which will be a good excuse to look into the different
sub classes of SQLException and transient versus
non transient.

Arne

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