Discussion on the technical principles of Java Affairs API framework in the Java Class Library
Discussion on the technical principles of Java Affairs API framework in the Java Class Library
introduction
Affairs management is an important technology widely used in software systems.Java provides many transaction API frameworks, such as the Java Transaction API (JTA), Java DataBase Connectivity (JDBC), Hibernate, Spring, etc.These frameworks allow developers to effectively manage affairs in Java applications.This article will explore the principles and working mechanisms of the Java transaction API framework.
1. Overview of affairs
Affairs is a logical unit of a group of operations, either all successfully executed or all failed to roll back.Affairs has an ACID attribute, that is, atomicity, consistency, isolation, and durability.The transaction management is to ensure the consistency and integrity of the database or other resources.
2. Java Affairs API framework
The Java Affairs API framework aims to simplify and unify the management process.The following will introduce several commonly used Java transaction API frameworks.
1. Java Transaction API (JTA)
JTA is part of the Javaee platform, which provides an interface to coordinate affairs in a distributed transaction environment.It uses TWO-PHASE Commit to maintain consistency between different resources.The JTA framework uses the TransactionManager and UserTransAction interface to start, submit or roll back transactions.
Example code:
import javax.transaction.*;
public class JtaExample {
public static void main(String[] args) throws Exception {
InitialContext ctx = new InitialContext();
UserTransaction ut = (UserTransaction)ctx.lookup("java:comp/UserTransaction");
ut.begin();
// Execute transaction operation
ut.commit();
}
}
2. Java Database Connectivity (JDBC)
JDBC is the standard API for interactive interaction with the database in Java.It provides the function of transaction management that allows developers to perform SQL statements in Java applications and manage transactions.Through the Commit () and Rollback () methods of the Connection object, you can submit or roll back the transaction.
Example code:
import java.sql.*;
public class JdbcExample {
public static void main(String[] args) throws Exception {
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");
conn.setAutoCommit(false);
// Execute transaction operation
conn.commit();
}
}
3. Hibernate
Hibernate is a Java persistence framework, which provides a wealth of object-related Mapping (ORM) function.It can automatically manage transactions and provide a transaction annotation to identify methods that need to be managed by transaction.
Example code:
import org.hibernate.Session;
import org.hibernate.Transaction;
public class HibernateExample {
public static void main(String[] args) {
Session session = HibernateUtil.getSessionFactory().openSession();
Transaction tx = session.beginTransaction();
// Execute transaction operation
tx.commit();
}
}
4. Spring
The Spring framework is a comprehensive corporate application development framework.It provides simple and powerful transaction management functions.By using Spring's @Transactional annotation, the method can be marked as a need for transaction management.
Example code:
import org.springframework.transaction.annotation.Transactional;
public class SpringExample {
@Transactional
public static void doTransaction() {
// Execute transaction operation
}
}
3. The working mechanism of the Java Affairs API framework
The working mechanism of the Java transaction API framework usually involves the following steps:
1. Start of Affairs
Before the start of the transaction, you need to call the relevant API based on the framework used to start the transaction.This will create a transaction context and bind all related operations to the context.
2. Execution of transaction operation
Once the transaction starts, the operation that needs to be completed in transactions (read or modify the database, etc.) can be performed.These operations will be performed in the context of affairs.
3. Submitting or rolling of transactions
Once all operations are successfully executed and the transaction has reached a consistent state, you can choose to submit the transaction.Submitting transactions will ensure that all operations are permanently saved into the database.If an error occurs during operation or the transaction cannot reach a consistent state, you can choose to roll back the transaction to revoke all operations.
4. The transaction is closed
Once the transaction is submitted or rolled, the context of the transaction will be closed and related resources will be released.
in conclusion
The Java transaction API framework provides the function of simplifying and unified transaction management.Developers can choose suitable frameworks according to specific needs to ensure the consistency and integrity of the database or other resources.
