The technical principles of Java Affairs API framework in the Java library

The technical principles of Java Affairs API framework in the Java library Overview: The Java transaction API framework is a framework for providing transaction management mechanisms in the Java class library.It provides developers with the ability to manage databases or other resources.The technical principles of the Java transaction API framework in the Java class library will be introduced below. 1. Principles of transaction management: In the database, transactions refer to a series of operations as a unit and performed as an atomic operation.If all the operations in the transaction are successfully executed, the transaction is considered to be successful.If any single operation fails, the entire transaction will be rolled back to the previous state.The goal of transaction management is to ensure that changes are always consistent. 2. Java transaction API interface: The Java transaction API framework mainly includes the following key interfaces: -TRANSACTIONMANAGER: The core interfaces of management and control of transactions include methods such as starting, submission, and rollback transactions. -UseRTRANSACTION: It represents the interface of a user affairs, including methods such as starting, submission, rollback and setting transaction attributes. -Xaresource: Represents the interface of a distributed transaction resource, including methods such as starting and ending transactions, registration and preparations. 3. Affairs manager implementation: The transaction manager is one of the core components of the Java transaction API framework.It is responsible for coordination and management affairs.The implementation of the transaction manager is usually completed by providing programs (such as JTA, JDBC, etc.) in a specific transaction manager in the Java library.The transaction manager provides a standard API to start, submit and roll back transactions, and coordinate multiple resources when needed. 4. Affairs isolation level: The Java transaction API framework provides different transaction isolation levels so that developers can choose appropriate levels according to the needs of the application.Common transaction isolation levels include: -The is the minimum level that allows reading that it has not been submitted. -The read (Isolation.read_committed): Allows to read the modification of other transactions. -The read. Renewal.: Make sure that the data reads is consistent when reading data during the execution of transactions. -Tilay.serializable: The highest level to ensure that transactions are running in a state of completely isolation. 5. Code example: The following is a simple Java code example. How to use the Java transaction API framework to manage database transactions: import javax.transaction.*; import java.sql.*; public class TransactionExample { private static final String DB_URL = "jdbc:mysql://localhost/mydatabase"; private static final String USER = "username"; private static final String PASS = "password"; public static void main(String[] args) { try { // Initialize transaction manager TransactionManager tm = com.arjuna.ats.jta.TransactionManager.transactionManager(); // Starting transaction tm.begin(); // Get the database connection Connection conn = DriverManager.getConnection(DB_URL, USER, PASS); // Execute the database operation // ... // Submit a transaction tm.commit(); // Close the database connection conn.close(); } catch (Exception e) { e.printStackTrace(); // Roll back transactions tm.rollback(); } } } The above example demonstrates how to initialize the transaction manager and use it to handle database transactions.In TRY blocks, we started a new business and obtained a database connection.Then perform database operations in transactions.If any abnormalities occur, the stack tracking will be printed and rolled back. in conclusion: The Java Affairs API framework is an important component for managing and controlling affairs in the Java platform.It provides a set of standardized interfaces and methods to enable developers to easily manage affairs and ensure the consistency of data.By understanding the technical principles of the Java transaction API framework, developers can better use their functions and characteristics to build a strong application.