The principle of implementation of Java Affairs API framework in the Java class library
The principle of implementation of Java Affairs API framework in the Java class library
Overview:
Affairs is an important concept of data consistency and integrity in database operations.The Java transaction API framework is designed to enable developers to be more easily managed and controlled by transaction operations.This article will introduce the implementation principle of the Java transaction API framework and provide relevant code examples.
1. What is a transaction?
A series of operations are performed as a logical work unit. If all operations are successfully completed, the transaction is considered to be successful, and the data will be submitted to the database.However, if any of the operations have an error, the entire transaction will be rolled back to the initial state, that is, all operations will be revoked.
2. Java Affairs API framework
The Java transaction API framework provides a set of interfaces and classes for implementation, management and control.It allows developers to combine multiple database operations into an atomic operation unit.If any operation is wrong, the entire transaction will be rolled back.The Java transaction API framework helps ensure the consistency and integrity of the database operation.
3. Implementation principle
The implementation principle of the Java transaction API framework involves the following key concepts:
3.1 Transaction Manager:
The transaction manager is responsible for the implementation of management and control.It provides a way to start, submit and roll back, and ensure that multiple database operations can be performed in an atomic manner.
3.2 Transaction definition:
Affairs definition is used to configure the attributes of transactions, such as isolation levels, communication methods, etc.It can be defined in the code or through the configuration file.
3.3 Transaction PointCut:
The entry point of the transaction is a set of a set of connection points, which is used to identify which methods need to be controlled by the transaction manager.Generally, the entry point is achieved through the cut surface, and the cut surface defines the application transaction on which connection points.
3.4 Transaction Advice:
The transaction notification is an operation at a specific entry point.It is triggered before, after, or abnormally occurs, and it is used to initialize, submit or roll back transactions.
3.5 transaction interceptor:
The transaction interceptor is created by configuring the entry point and transaction notification.It intercepted the method of meeting the conditions of the entry point and implemented the notification of affairs at the right time.
4. Code example
Below is a simple Java code example, showing how to use the Java transaction API framework to manage and control a database business:
import javax.sql.DataSource;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.DefaultTransactionDefinition;
public class TransactionExample {
private PlatformTransactionManager transactionManager;
private JdbcTemplate jdbcTemplate;
public void setTransactionManager(PlatformTransactionManager transactionManager) {
this.transactionManager = transactionManager;
}
public void setDataSource(DataSource dataSource) {
this.jdbcTemplate = new JdbcTemplate(dataSource);
}
public void performTransaction() {
TransactionStatus transactionStatus = transactionManager.getTransaction(new DefaultTransactionDefinition());
try {
// Execute the database operation 1
jdbcTemplate.update("INSERT INTO table1 (column1) VALUES ('value1')");
// Execute the database operation 2
jdbcTemplate.update("INSERT INTO table2 (column2) VALUES ('value2')");
transactionManager.commit(transactionStatus);
} catch (Exception e) {
transactionManager.rollback(transactionStatus);
}
}
}
In the above examples, we first created an object of `PlatformtransActionManager, and injected it into the` TransactionExample` class.Then, we set the data source to create an `jdbctemplate` object.In the `Performtransactions', we create a new transaction through the` TransactionManager` object and perform two database operations in them.If any operation fails, the transaction will be rolled back; otherwise, the transaction will be submitted.
Summarize:
The Java transaction API framework cooperates with components such as transaction manager, transaction definition, transaction entry point, transaction notification, and transaction interceptor to realize the transaction management and control function of database operations.Developers can use the Java transaction API framework to ensure the consistency and integrity of the database operation.In this article, we briefly introduced the implementation principle of the Java transaction API framework, and provided a simple code example to demonstrate its usage.
