HP Integrity NonStop H-Series - Manual (Page 371)

18 Using Spring Transaction Manager
This section describes how a Spring application can manage its database transactions using a
Spring Transaction Manager. This is demonstrated by modifying the EmpInfo application
(developed in
Getting Started with Spring chapter) using the Eclipse IDE.
The following topics are discussed in this section:
• Why Transaction Management is required
• Spring Transaction Management
• Example of Using Spring Transaction Manager
Why Transaction Management is required
A transaction is an inseparable unit of work comprising several operations, all or none of which
must be performed to preserve data integrity.
A transaction may contain one or more SQL statements, all of which can be either committed
(applied to the database) or rolled back (undone from the database) simultaneously. Thus,
whenever a set of operations needs to be implemented or completed simultaneously and if any
error occurs during any of the operation, the whole set of operations must be undone. This is
done using the Transaction Manager.
Spring Transaction Management
The Spring framework enables you to leverage the complete transaction support. It provides the
following ways for managing transactions:
• Declarative Transaction Management
• Programmatic Transaction Management
Declarative Transaction Management
The Declarative Transaction Management in Spring uses the Spring Aspect Oriented Programming
(AOP) feature to implement transactions on a particular business logic class. This option has
minimum impact on the application code and hence is widely used.
Programmatic Transaction Management
In Programmatic Transaction Management, the transaction manager is handled within the
application code.
A programmatic transaction can be a Java Database Connectivity (JDBC) or Java Transaction
API (JTA) transaction. In the Spring framework, programmatic transaction management can be
done using:
• TransactionTemplate: uses a callback approach to free application code and release
transactional resources.
• PlatformTransactionManagerImplementation: uses an instance of
org.springframework.transaction.PlatformTransactionManager and initiates
transactions using the TransactionDefinition and TransactionStatus objects.
Example of Using Spring Transaction Manager
This section describes how business transactions in a Spring application (EmpInfo) can be managed
using the Declarative approach and the Programmatic approach.
Why Transaction Management is required 371