这不是一条 SQL 就搞定的事情吗？ 我曾经负责过的并发量蛮高的商品库存系统，核心扣减逻辑真的就是靠一条 SQL 搞定的。没有引入分布式锁（如 Redis Lock）或者消息队列。 核心思路其实就是数据库层面的乐观锁。利用 MySQL 的行锁特性 + UPDATE 语句的原子性，再配合 Java 中判断影响行数（Affected ...

Abstract: The lack of information within relational databases expressed as NULL values presents a problem in ensuring the quality of data and the information retrieved by SQL queries. This is so ...

在 Go 语言与数据库交互的实战中，有一个让无数新手（甚至资深开发者）挠头的“坑”，那就是 NULL。 你是否遇到过这样的场景？ 数据库崩溃：代码试图把数据库里的 NULL读入 Go 的 string变量，结果报错。 API 数据丑陋：为了解决报错使用了 sql.NullString，结果 ...

Scientists overwhelmingly recognize the value of sharing null results, but rarely publish them in the research literature, according to a survey. The findings suggest that there is a need for ...

Null pointer exceptions are no fun. You can avoid them and keep your code clean and maintainable by using these techniques to elegantly handle null values in C#. When working on applications in any ...

Handling Null Values A null value in a relational database is used when the value in a column is unknown or missing. A null is neither an empty string (for character or datetime data types) nor a zero ...