HP Integrity NonStop J-Series - Manual (Page 222)

6 Integrating Frameworks
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” (page 38) section) using the Eclipse Galileo IDE.
The following topics are discussed in this section:
•
“Why Transaction Management is required” (page 222)
•
“Spring Transaction Management” (page 222)
•
“Example of Using Spring Transaction Manager” (page 222)
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” (page 222)
•
“Programmatic Transaction Management” (page 222)
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.
222 Integrating Frameworks