Java Affairs API Actual Combat Guide

Java Affairs API Actual Combat Guide In modern application development, transaction management is a very important technology.The Java platform provides a strong affairs API that helps developers to easily manage and control database operations.This article will introduce the basic concepts and usage of the Java transaction API, and provide some actual combat examples. 1. Basic concept of transaction Affairs refers to a series of operations. These operations are either successfully executed or all of them are not performed.Affairs is characterized by atomic, consistency, isolation and persistence.The Java transaction API provides a standardized way to manage affairs in applications. 1. Atomicity: All operations in the transaction are either successfully submitted or rolled back.Some parts will not be successful and the other part of the operation fails. 2. consistency: The status of the database before and after execution must be consistent.If the execution of the transaction destroys the consistency of the database, the transaction will be rolled back. 3. Isolation: The transactions that are executed cannot be interfered with each other.Every transaction should not feel the existence of other transactions at the same time. 4. Durability: Once the transaction is submitted, the operation of the database is permanent.Even if the system fails, the data will not be lost. 2. Use transaction API to implement transaction management The Java platform provides a variety of transaction management mechanisms, such as the JDBC (Java database connection) affairs, the JTA (Java transaction API) affairs, etc.Let ’s take JDBC transactions as an example to introduce how to use transaction API to achieve transaction management. 1. Create a database connection: First of all, we need to create a connection to the database through the JDBC API. Connection connection = DriverManager.getConnection(url, username, password); 2. Close automatic transaction submission: By default, JDBC will automatically submit each SQL statement as a transaction to a database.We need to disable automatic submission to manually manage affairs. connection.setAutoCommit(false); 3. Executive transaction operation: perform a series of database operations in transactions, such as insertion, update, deletion, etc. Statement statement = connection.createStatement(); statement.executeUpdate("INSERT INTO table_name (column1, column2) VALUES ('value1', 'value2')"); statement.executeUpdate("UPDATE table_name SET column1 = 'new_value' WHERE column2 = 'value2'"); 4. Submit or roll back transactions: According to the results of the operation, we can choose to submit or roll back the transaction. try { connection.commit(); System.out.println ("Successful transaction submission"); } catch (SQLException ex) { connection.rollback(); System.out.println ("Rolling"); } 5. Close the database connection: Finally, remember to close the database connection. connection.close(); 3. Precautions for transactions When using the transaction API for development, there are several important precautions that need to be kept in mind. 1. Avoid long -term transactions: long -term transactions will occupy database resources and increase the possibility of concurrency problems.Try to limit transaction operations to the shortest time range. 2. Abnormal treatment: It is important to deal with abnormalities and roll back transactions in time during transaction processing.Ensuring the correct processing of abnormalities can ensure the consistency of the data. 3. Code reuse: Packing and reuse of the code of transaction management can reduce code redundancy and make the code more maintainable and scalable. Fourth, summary This article introduces the basic concepts and usage of the Java transaction API, and provides an example of using JDBC transaction management.Using transaction API can help developers better manage and control database operations to ensure the consistency and reliability of data.In actual development, it is important to choose the appropriate transaction management method according to the different needs and the technical stack.