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From <Malte.Kem...@de.equens.com>
Subject AW: Does derby ned allways a rollback or commt?
Date Tue, 22 Nov 2011 11:44:59 GMT
So what would be the best practice using a rollback or a commit when just reading a database?




Von: Florin.Herinean@sungard.com [mailto:Florin.Herinean@sungard.com] 
Gesendet: Dienstag, 22. November 2011 12:14
An: derby-user@db.apache.org
Betreff: AW: Does derby ned allways a rollback or commt?


That is not derby specific. In any db selects are part of transactions too. So either you
enable autocommit or you explicitly commit your transaction(s) before releasing the connection.
Commit will release the locks you acquired on the db (read locks if you haven't modified anything).






Von: Malte.Kempff@de.equens.com [mailto:Malte.Kempff@de.equens.com] 
Gesendet: Dienstag, 22. November 2011 12:09
An: derby-user@db.apache.org
Betreff: Does derby ned allways a rollback or commt?



I have an application using embedded derby ( In the program I use a little routine
that ends with rollback, commit or nothing at all, by using a parameter.

In a certain mode I just do a select, so As far I concern I don't need to do neither rollback
nor commit, since it is just a select.

But I get then always an Exception:


Eine Verbindung kann nicht beendet werden, solange noch eine Transaktion aktiv ist.

      at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)

      at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)

      at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)

      at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown Source)

      at org.apache.derby.impl.jdbc.EmbedConnection.newSQLException(Unknown Source)

      at org.apache.derby.impl.jdbc.EmbedConnection.checkForTransactionInProgress(Unknown

      at org.apache.derby.impl.jdbc.EmbedConnection.close(Unknown Source)


That obviously is the code 25001


Even though I initialize all my prepared statements that also are inserts and updates, in
this mode only a select statement is used.

How come I get such a Exception. It seems that I have to commit or rollback always I quit
a derby program even though no change has occurred on particular database


Or is there something I should care about?

Equens SE

Malte Kempff

Core Applications/ Change Bulk Payments

Tel:      +49(0)69/58 99 93 - 60417

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mail to:Malte.Kempff@de.equens.com 


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