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Spring Transaction Management. A database transaction is a sequence of actions that are treated as a single unit of work.

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These actions should either complete entirely or take no effect at all. Transaction management is an important part of RDBMS- oriented enterprise application to ensure data integrity and consistency.

The concept of transactions can be described with the following four key properties described as ACID . Each transaction should be isolated from others to prevent data corruption. Durability . The simplistic view of a transaction issued to the database using SQL is as follows . Spring's transaction support aims to provide an alternative to EJB transactions by adding transaction capabilities to POJOs. Download Generator Rex Game Pc.

Spring supports both programmatic and declarative transaction management. EJBs require an application server, but Spring transaction management can be implemented without the need of an application server. Local vs. Global Transactions. Local transactions are specific to a single transactional resource like a JDBC connection, whereas global transactions can span multiple transactional resources like transaction in a distributed system. Local transaction management can be useful in a centralized computing environment where application components and resources are located at a single site, and transaction management only involves a local data manager running on a single machine.

Local transactions are easier to be implemented. Global transaction management is required in a distributed computing environment where all the resources are distributed across multiple systems. In such a case, transaction management needs to be done both at local and global levels. A distributed or a global transaction is executed across multiple systems, and its execution requires coordination between the global transaction management system and all the local data managers of all the involved systems. Programmatic vs. Declarative.

Spring supports two types of transaction management . That gives you extreme flexibility, but it is difficult to maintain. Declarative transaction management . You only use annotations or XML- based configuration to manage the transactions.

Declarative transaction management is preferable over programmatic transaction management though it is less flexible than programmatic transaction management, which allows you to control transactions through your code. But as a kind of crosscutting concern, declarative transaction management can be modularized with the AOP approach. Spring supports declarative transaction management through the Spring AOP framework. Spring Transaction Abstractions. The key to the Spring transaction abstraction is defined by the org. Platform. Transaction.

Manager interface, which is as follows . Spring offers all of the transaction propagation options familiar from EJB CMT. Isolation. Level()This method returns the degree to which this transaction is isolated from the work of other transactions. String get. Name()This method returns the name of this transaction. Timeout()This method returns the time in seconds in which the transaction must complete. Read. Only()This method returns whether the transaction is read- only.

Following are the possible values for isolation level .