java 更新mysql语句

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

public class UpdateExample {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String username = "root";
        String password = "password";

        try (Connection conn = DriverManager.getConnection(url, username, password)) {
            String sql = "UPDATE users SET age = ? WHERE id = ?";
            try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
                pstmt.setInt(1, 30); // 设置新的年龄值
                pstmt.setInt(2, 1); // 设置要更新的用户ID
                int affectedRows = pstmt.executeUpdate();
                System.out.println("受影响的行数: " + affectedRows);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}