MyBatis如何實現異步提交

MyBatis并沒有內置的異步提交功能，但是可以通過使用Executor的插件來實現異步提交。

以下是實現異步提交的步驟：

1. 創建一個自定義的Executor的插件，繼承自Executor的實現類，并重寫update方法，在update方法中使用線程池異步提交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義的Executor：

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

3. 創建一個自定義的線程池類AsyncExecutorService，用于執行異步任務：

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);
    }
}

通過以上步驟，就可以實現MyBatis的異步提交功能。當調用update方法時，SQL操作會被異步提交到線程池中執行。