Does Java database connection support multi-threaded access?

Multi-threaded access to database connections in Java depends on the JDBC driver used: Drivers that support multi-threading (such as MySQL Connector/J, PostgreSQL JDBC): can allow multiple threads to access the database at the same time, providing thread-safe connections . Drivers that do not support multi-threading (such as HSQLDB JDBC, Derby JDBC): concurrency problems may occur when multiple threads use a single connection at the same time, and a separate connection needs to be created for each thread.

Multi-threaded access to database connections in Java

In Java, whether multi-threaded access to database connections is supported depends on The JDBC driver used. Some drivers support multi-threaded access, while others do not.

JDBC drivers that support multi-threading

The following are some popular JDBC drivers that support multi-threaded access:

• MySQL Connector/ J
• PostgreSQL JDBC Driver
• Oracle JDBC Driver

These drivers provide thread-safe connections, allowing multiple threads to access the database simultaneously without concurrency issues .

JDBC drivers that do not support multi-threading

Some JDBC drivers do not support multi-threaded access, which means that when multiple threads try to use a single connection at the same time Concurrency issues may occur. These include:

• HSQLDB JDBC Driver
• Derby JDBC Driver

When using these drivers, you must create a separate Connection.

Practical case

Let us demonstrate multi-threaded database access through an example. This example uses the MySQL Connector/J driver, which supports multi-threaded access:

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class MultithreadedDatabaseAccess {

    public static void main(String[] args) {
        // JDBC URL, 用户名和密码
        String jdbcUrl = "jdbc:mysql://localhost:3306/test";
        String username = "root";
        String password = "password";

        // 创建并启动多个线程
        Thread[] threads = new Thread[5];
        for (int i = 0; i < threads.length; i++) {
            threads[i] = new Thread(() -> {
                try {
                    // 获取数据库连接
                    Connection connection = DriverManager.getConnection(jdbcUrl, username, password);

                    // 执行查询或更新
                    // ...

                    // 关闭连接
                    connection.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            });
        }

        for (Thread thread : threads) {
            thread.start();
        }
    }
}

In this example, 5 threads simultaneously create a database connection, perform tasks, and close the connection. Because it uses a JDBC driver that supports multithreading, the program is safe for multithreaded access without concurrency issues.

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