Use the "Affairs JTA" framework to handle database transactions in the application in the Java library
Use the "Affairs JTA" framework to handle database transactions in the application in the Java library
Introduction:
Affairs JTA (Java Transaction API) is a standard programming interface used to manage distributed transactions on the Java platform.It provides a mechanism that can coordinate and handle transaction operations between different database connections, message queues and other resources.The use of transaction JTA framework in Java applications can ensure the consistency and persistence of data, and at the same time provide the isolation level and rollback mechanism of transactions.
The JTA framework is part of the Java EE specification. Therefore, in the Java EE application, the application server will automatically provide the function of JTA management transactions.However, in an independent Java application, we need to introduce the corresponding dependencies and configure the JTA framework to manage affairs.
The steps of using the transaction JTA framework to process database transactions are as follows:
1. Configuration dependency library:
First, the corresponding dependency library is added to the construction configuration file (such as POM.XML).Common JTA implementation frameworks include Atomikos, Bitronix, and Narayana. You can choose the appropriate framework according to your needs.
2. Configure JTA transaction manager:
Configure the JTA transaction manager in the code to manage and control the beginning, submission or rollback operation of management and control.Below is an example code using Atomikos as a JTA implementation framework:
import com.atomikos.icatch.jta.UserTransactionImp;
import com.atomikos.icatch.jta.UserTransactionManager;
import javax.transaction.TransactionManager;
import javax.transaction.UserTransaction;
public class TransactionManagerUtil {
private static final TransactionManager tm;
private static final UserTransaction ut;
static {
UserTransactionManager utm = new UserTransactionManager();
UserTransactionImp uti = new UserTransactionImp();
ut = uti;
tm = utm;
}
public static TransactionManager getTransactionManager() {
return tm;
}
public static UserTransaction getUserTransaction() {
return ut;
}
}
3. Implement the database operation:
Use the JTA transaction manager to manage the transaction in the code operated by the database.The following is a simple example of using the JTA framework to deal with database transactions:
import javax.transaction.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
public class DatabaseOperations {
public void insertData(String data) throws SQLException, SystemException, NotSupportedException, HeuristicRollbackException, HeuristicMixedException, RollbackException {
UserTransaction ut = TransactionManagerUtil.getUserTransaction();
ut.begin();
try {
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");
Statement stmt = conn.createStatement();
stmt.executeUpdate("INSERT INTO mytable (data) VALUES ('" + data + "')");
stmt.close();
conn.commit();
conn.close();
ut.commit();
} catch (Exception e) {
ut.rollback();
throw e;
}
}
}
In the above examples, first obtain the UserTransaction and TransactionManager instances from the TransactionManagerutil class, and then use the UserTransaction instance in the database operation method to open, submit and roll back transactions.In the CATCH block, if an abnormality occurs, the rollback operation is performed.
in conclusion:
Using transaction JTA framework can ensure the consistency and persistence of data when processing database transactions in Java applications.By configured the dependency library and JTA transaction manager, and using JTA transactions in database operations, we can easily control the start, submission, and rollback operation of the affairs, and realize the management of database transactions.
