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orm

Posted by 夏泽民 Feb 3, 2020

什么是“持久化” 持久（Persistence），即把数据（如内存中的对象）保存到可永久保存的存储设备中（如磁盘）。持久化的主要应用是将内存中的数据存储在关系型的数据库中，当然也可以存储在磁盘文件中、XML数据文件中等等。

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map 有序 json

Posted by 夏泽民 Feb 3, 2020

Golang map实现原理是hash map（核心元素是桶，key通过哈希算法被归入不同的bucket中），key是无序的，很多应用场景可能需要map key有序（例如交易所订单撮合），C++ 的stl map 实现了key有序，实际上是TreeMap是基于树（红黑树）的实现方式，即添加到一个有序列表，在O(log n)的复杂度内通过key值找到value，优点是空间要求低，但在时间上不如HashMap。

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lockedSource

Posted by 夏泽民 Feb 3, 2020

Carlo Alberto Ferraris提交了一个对math/rand库中的lockedSource优化的pr(CL#191538),核心代码其实只有一行，却带来了相对的巨大的性能提升，让我们一起老看看这次的修改，学习一下代码的优化技巧，提高我们Go语言的底层优化经验。 https://go-review.googlesource.com/c/go/+/191538/ https://colobu.com/2019/12/31/small-changes-big-improvement/

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inline defer

Posted by 夏泽民 Feb 3, 2020

https://rakyll.org/inlined-defers/ https://github.com/golang/proposal/blob/master/design/34481-opencoded-defers.md https://changelog.com/gotime/112 Go’s defer keyword allows us to schedule a function to run before a function returns. Multiple functions can be deferred from a function. defer is often used to cleanup resources, finish function-scoped tasks, and similar. Deferring functions are great for maintability. By deferring, for example, we reduce the risk of forgetting to close the file in the rest of the program:

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net/http包

Posted by 夏泽民 Feb 3, 2020

Golang仅需要几行代码，便可以建立一个简单的 Web 服务：

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