英语学习路(一) optimistic

本文探讨了作者如何在面对传统迷信和家庭压力时,坚持自我,勇敢追求真爱的故事。通过科学知识和理性思考,作者成功说服了家人,实现了个人与家庭的和谐统一。

 

      Areyou still a signal now?  Or maybe you have a baby now, but please trust me, some of you ever suffering the big difficulty like me. When you aresingle, it's not just your problem, it's your parents', your relatives’, evenit's your  close neighbors'. With time goes by, you have  a lot moretimes to receive the only topic  betweenyou like "do you have a boy friend? You are not so young yet". Wow,  I  just  want to escape.  Then I start arrangingmy path to marriage. First, find a boy friend, second, let parents accept them,third. …then get marriage.

    I’m lucky, I fell in love with my boy friend at first sight. I wasproud   interrupting my mother intention to introduce me a handsome guy. Then I got a sequence questions youguys guess right. I am ready to talk about his job, his height, his kindness,his hardworking and responsibility. But when I just said the age, the conversation stopped. Because our Chinese zodiacs don’t match. It’s unbelievable the superstation became the first obstacle inmy marriage path. Even I found that it’s obviously  huge  gap. Because the following two years my motherfind some traditional fortunetelling  in famouslocal temple. They give  the samesuggestion. They show me the same information from  the internet. What’s worse, My great auntshows me an example, a couples of her relatives have the same birth of yearlike mine, they did not live   together normally, one of them deadearly because of some diseases. I am not opposed to  her, because mygreat  uncle is a secretary in a high school, and they are so sincere. Maybe I will change myself.

     But my boy friend has a stronger will. He said those are psychology effection. If you believe, it’s true for you, otherwise it’s not.  If we want to get married, we have to persuade our parents accepting us. Chinese zodiac gives me so many good memory in my childhood. Each year, Before NewYear’s eve we bought some new pictures about the next year’s zodiac animal. Youcan see some good wish in it, the little girl with a big ingot riding on thehorse, it stands for your family will  be rich in the next horse year. Ifyou see the monkey in the  antithetical couplet, it maybe  tell youthe next monkey year you will get good fortune. Watching CCTV Spring FestivalGala, eating dumplings with family, you also can get new dress and a little red packets. But now, I hate  it.

     I remember  an interesting  news. Some couples escape giving birth inthe coming sheep year, some pregnant even choose abortion, they believe in nine percent sheep will die, they are afraid of the bad fortune,worse fate around their babies.It was so ridiculous and brought others somewrong direction. So experts  tell us it’s not right, it comes from common people unsatisfied with the government threaten them using their zodiac of sheep. I think Chinese feng shui is so popular in the world, especially in Chinese people deep heart. No matter the popular star, or the commonpeople, you can see the wang lin,who is a menter of qigong, Li BingBing , whois a successful movie star,wang fei and Li yapeng ever stars couples , zhao weiwho award too much in different media field. All of them made a visit him andtook group photos, but is he really has the powerful and miracle ability? If it’s  true, why did not he forecast himself before he met a bad fortune? The media exposed his conmanship in the year of  2013. Unfortunately,a few days ago, I saw a news, a  farmer  has sexual intercourse withsome college female students who are superstitious and greedy.
     My boy friend and I use our good personalities to changeour parents’ superstition. We use the scientific examples against superstition.Finally, we  win. It’s closer to the marriage. I know it’s a traditional cultures, but please don’t be silly. You should distinguish it clearlysometimes. When you get lost good fortune, you can calm down at first, thenfind the right way. Please don’t be greedy, if you dream getting a million atone day without actually hard work, it’s definitely infeasible. Please trustthe science, trust psychology effection. Like a story. A teacher will teach themost brilliant students   told by the principal, finally, the principaltold  a lie, but the teacher  proved he has the ability to teach acommon students to most brilliant ones. Don’t let superstition change your life worse.

 

<think>好的,我需要解决用户关于乐观锁错误的问题。首先,我需要回顾下乐观锁的基本概念。乐观锁是种并发控制机制,适用于多用户环境,它假设冲突不常发生,因此在数据更新时才会检查版本号或时间戳[^3]。 用户提到的乐观锁错误通常发生在更新时检测到数据已被修改,导致版本不匹配。常见的解决方案可能包括重试机制、合理设计版本字段、处理异常以及优化事务粒度。 根据引用[3],使用行版本(rowversion)数据类型可以实现乐观并发控制。比如在SQL Server中,可以通过在表中添加版本字段,并在更新时检查该字段是否变化。如果版本不匹配,则抛出错误,应用程序应捕获此错误并进行相应处理,如重试操作或通知用户。 此外,引用[2]提到MySQL中不同语句的加锁机制,虽然主要讨论悲观锁,但可以借鉴其处理并发冲突的思。例如,在应用层实现版本检查,确保更新操作基于最新数据。 接下来,我需要将这些思整理成结构化的解决方案,包括具体步骤和示例代码。同时,要确保使用正确的LaTeX格式,如独立公式用$$...$$,行内公式用$...$,并引用相关文献。</think>### 如何解决乐观锁错误问题? 乐观锁错误通常发生在并发更新时检测到数据版本不致。以下是分步解决方案: --- #### 1. **乐观锁的实现原理** 乐观锁通过为数据添加版本标识(如时间戳、版本号)实现。更新时检查版本是否匹配: $$ \text{UPDATE table SET data=new_data, version=version+1 WHERE id=target_id AND version=old_version} $$ 若返回影响行数为0,则说明版本冲突,需处理异常。 --- #### 2. **解决方案步骤** **步骤:添加版本字段** 在数据库表中增加版本控制字段(例如`version`或`rowversion`)。 ```sql ALTER TABLE products ADD version INT DEFAULT 0; -- 或使用SQL Server的rowversion类型 ALTER TABLE products ADD row_version rowversion; ``` **步骤二:读取数据时获取版本值** ```java // 伪代码示例 Product product = dao.getProductById(1); int currentVersion = product.getVersion(); ``` **步骤三:更新时检查版本** ```sql UPDATE products SET stock = stock - 1, version = version + 1 WHERE id = 1 AND version = currentVersion; ``` **步骤四:处理版本冲突** - **重试机制**:自动重试更新操作(需限制最大重试次数)。 - **用户提示**:若冲突频繁,提示用户重新加载数据后提交。 ```java int retryCount = 0; while (retryCount < 3) { try { updateWithVersionCheck(); break; } catch (OptimisticLockException e) { retryCount++; // 重新读取最新数据 product = dao.getProductById(1); } } ``` --- #### 3. **其他优化建议** - **降低事务粒度**:减少事务持有锁的时间,例如拆分长事务。 - **结合业务逻辑**:部分场景可合并冲突(如库存扣减使用原子操作`UPDATE stock = stock - 1`)。 - **监控冲突率**:若冲突率高,可能需要改用悲观锁(如`SELECT FOR UPDATE`)[^2]。 --- #### 示例:SQL Server中的乐观锁实现 ```sql -- 创建表时包含rowversion字段 CREATE TABLE orders ( id INT PRIMARY KEY, amount DECIMAL(10,2), row_version rowversion ); -- 更新时检查row_version UPDATE orders SET amount = 100.50 WHERE id = 1234 AND row_version = @previous_row_version; ``` 若更新失败,应用程序需重新读取数据并重试。 --- ### 相关问题 1. 如何选择乐观锁和悲观锁的应用场景? 2. 乐观锁在分布式系统中如何实现? 3. 如何处理高并发下的乐观锁性能瓶颈? --- 通过以上步骤,可有效解决乐观锁错误问题,确保数据致性并平衡并发性能[^2]。
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