MyBatis如何实现异步提交

MyBatis并没有内置的异步提交功能，但是可以通过使用Executor的插件来实现异步提交。

以下是实现异步提交的步骤：

1. 创建一个自定义的Executor的插件，继承自Executor的实现类，并重写update方法，在update方法中使用线程池异步提交SQL操作。

public class AsyncExecutor extends BaseExecutor {

    private ExecutorService executorService;

    public AsyncExecutor(ExecutorService executorService, Configuration configuration, Transaction transaction) {
        super(configuration, transaction);
        this.executorService = executorService;
    }

    @Override
    public int update(MappedStatement ms, Object parameter) throws SQLException {
        Future<Integer> future = executorService.submit(() -> {
            return super.update(ms, parameter);
        });

        try {
            return future.get();
        } catch (InterruptedException | ExecutionException e) {
            throw new SQLException("Error executing update", e);
        }
    }
}

2. 在MyBatis的配置文件中配置使用自定义的Executor：

<configuration>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <!-- 数据源配置 -->
            </dataSource>
            <executor type="AsyncExecutor">
                <property name="executorService" value="com.example.AsyncExecutorService"/>
            </executor>
        </environment>
    </environments>
</configuration>

3. 创建一个自定义的线程池类AsyncExecutorService，用于执行异步任务：

public class AsyncExecutorService {
    
    private ExecutorService executorService;

    public AsyncExecutorService(int corePoolSize, int maxPoolSize, long keepAliveTime, TimeUnit unit) {
        executorService = new ThreadPoolExecutor(corePoolSize, maxPoolSize, keepAliveTime, unit, new LinkedBlockingQueue<>());
    }

    public Future<Integer> submit(Callable<Integer> task) {
        return executorService.submit(task);
    }
}

通过以上步骤，就可以实现MyBatis的异步提交功能。当调用update方法时，SQL操作会被异步提交到线程池中执行。