Java transaction API: the key concept that developers must know
Java transaction API: the key concept that developers must know
The transaction management in Java is an important part of the developer's processing data consistency and reliability in the application.Affairs can ensure that a set of operations are all successful in the database or all failure, so as to maintain the integrity of data.Java provides a set of transaction APIs that enable developers to manage and control affairs.This article will introduce the key concepts of the Java transaction API, and provide some code examples to help developers better understand and use transaction processing.
1. Transaction
Affairs is a series of associated operations for execution units, which are regarded as an indiscriminate work unit.Affairs follows ACID (atomic, consistency, isolation and persistence) attributes, that is, they are atomic, consistent, isolated and durable.
2. Transaction Manager
The transaction manager is a component for managing and coordinating affairs.It is responsible for the launch, submission and rollback of affairs.The javax.transaction.transactionManager` interface in java transaction API defines the behavior of the transaction manager.
Below is a simple example of using `TransactionManager`:
import javax.transaction.TransactionManager;
public class TransactionExample {
private TransactionManager transactionManager;
public void performTransaction() {
try {
transactionManager.begin();
// Perform transaction operations here
transactionManager.commit();
} catch (Exception e) {
try {
transactionManager.rollback();
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
}
3. Transaction definition
Affairs definition contains the attributes and behaviors of affairs.It defines the attributes of the isolation level, timeout time, and whether it is read only.The `javax.transaction.transactionDefinition` interface of Javax.transactions in Java Act API defines the specifications of transaction definition.
4. Transaction Template
The transaction template is a simplified tool for performing transaction operations.It encapsulates the start, submission and rollback process of transactions, and developers only need to provide transaction logic.The `ORG.SpringFramework.transaction.support.transactionsActionTemplate` class is one of the commonly used transaction template implementations in Java Act API.
The following is an example code for using transaction templates to execute transactions:
import org.springframework.transaction.support.TransactionTemplate;
public class TransactionTemplateExample {
private TransactionTemplate transactionTemplate;
public void performTransaction() {
transactionTemplate.execute(status -> {
// Perform transaction operations here
return null;
});
}
}
5. Data Access Object
Data access objects are a design pattern that encapsulates access to data sources.In transaction processing, the data access object is responsible for performing transaction operations and interacts with the transaction manager.Developers can use transaction templates to implement transaction management of data access objects.
The following is an example of a simple data access object:
public class EmployeeDAO {
private TransactionTemplate transactionTemplate;
private DataSource dataSource;
public void saveEmployee(Employee employee) {
transactionTemplate.execute(status -> {
// Use the data source to execute the preservation operation
return null;
});
}
}
Summarize:
This article introduces the key concepts of the Java transaction API, including transaction, transaction manager, transaction definition, transaction templates and data access objects.Understanding these concepts and using the corresponding API can help developers better handle transaction operations and ensure the consistency and reliability of data.
Please note that the implementation of transaction managers, transaction templates and data access objects in the above code examples can be different according to the specific framework and needs.Developers should choose a suitable implementation method according to their own project requirements.
