05 Transactions

Transactions Managing concurrent data access

Transactions ,[object Object],Transaction begin rollback commit Transaction Succeeded Transaction Failed Initial State

Hibernate transaction support ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The Hibernate Transaction API ,[object Object],[object Object],[object Object],[object Object],Session session = sessions.openSession(); Transaction tx = null; try { tx = session.beginTransaction(); concludeAuction(); tx.commit(); } catch (Exception e) { if (tx != null) tx.rollback(); throw e; } finally session.close(); }

Session flushing and closing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Session granularity I ,[object Object],[object Object],S1 Request T1 Response

Long running application transactions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Application Transaction: An example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Session granularity II ,[object Object],[object Object],[object Object],[object Object],[object Object],S1 Request T1 Response S2 Request T2 Response Detached Instances Application Transaction

Session granularity III ,[object Object],[object Object],[object Object],[object Object],[object Object],S1 Request T1 Response Request Tx Response Disconnected from JDBC connection Application Transaction

Managed versioning ,[object Object],[object Object],[object Object],public class Item { ... private int version; ... private void setVersion(int version) { this.version = version; } private int getVersion() { return version; } } <class name="Item" table="ITEM"> <id ..... <version name="version" column="VERSION"/> ... </class>

Managed versioning in action ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],update ITEM set DESCRIPTION='New Description', SELLER=45, VERSION=3 where ID=123 and VERSION=2

Managed version without a version/timestamp property ,[object Object],[object Object],[object Object],[object Object],<class name="Item" table="ITEM" optimistic-lock="all" >  <id ..... ... </class> update ITEM set DESCRIPTION='New Description', SELLER=45 where ID=123 and DESCRIPTION='Old Description' and SELLER=45

Transaction isolation I ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Which isolation level should we use with Hibernate?

Transaction Isolation II ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

05 Transactions

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05 Transactions