<p>This is one part of Go I'm having trouble understanding. A buffer is an ordered collection of bytes. Some functions read data into buffers, or out of buffers, and I can make a new buffer out of a []byte.</p> <p>One new thing is that a buffer stores a marker of the 'current position', and has a <code&...阅读全文
声明：本文内容纯属博主自己查找和归纳的个人所需的知识点，仅作参考，如有错误，博主强烈希望您指出。如果您是某个知识点的原创博主，如有需要，可联系本人加上链接。本文内容会根据博主所需进行更新，希望大家多多关照。 MySQL底层数据结构 B+树 存储引擎之二：InnoDB与Myisam InnoDB Myisam 事务 支持 不支持 外键 支持 不支持 锁 表锁、行锁 表锁 总行数 需要扫描整个表 直接读取 文件 .idb数据文件和它的.frm文件，表的大小只受限于操作系统文件的大小，一般为 2GB .frm文件存储表定义。数据文件的扩展名为.MYD (MYData)。索引文件的扩展名是.MYI (MYIndex)。 使用环境 都符合要求的情况下，改动多的时候 都符合要求的情况下，查找多的时候 自...阅读全文
<p>Learning go by gobyexample.com and im' confused what's the point of channels. When you use it? and why? </p> <hr/>**评论：**<br/><br/>mwholt: <pre><p>Channels are primarily valuable synchronization primitives. See <a href="https://golang.org/doc/effective_go.html#channels" rel=...阅读全文
<p>I'm following a book which shows the following example.</p> <pre><code>package main import ( "fmt" ) const ( KB = 1024 MB = 1048576 //KB * 1024 GB = 1073741824 //MB * 1024 TB = 1099511627776 //GB * 1024 PB = 1125899906842624 //TB * 1024 ) type ByteSize ...阅读全文
<p>When creating a database handle, where the the variable 'db' is declared outside of main, why does this produce a panic: </p> <pre><code>db, err := sql.Open("mysql", "user:pass@unix(/path/mysqld.sock)/dbname") </code></pre> <p>but this doesn't: &...阅读全文
Tips: all for hands-free. Tips 系列：记录日常解决问题、解放双手的一些小技巧。 目的只有一个：不被重复的琐事麻痹，能偷懒的绝不手软。 今天聊聊如何优雅的使用GDB调试Go程序。 GDB有啥用？ 想了解代码底层的话，它是一大利器，更别说定位问题啥的。 具体骚操作见曹大的使用 debugger 学习 golang 但GDB从安装到可用，可能有一大堆问题要解决（尤其在Mac上），我们怎么能优雅的使用它，避免陷入问题中，是本文的重点。 （涉及Docker和Mac两个平台上运行） 先来看比较推荐的Docker方式 Docker篇：3步即可调试 docker加持的话，非常方便，随用随起 先上效果：戳 gdb-debug-go-in-docker 可下载命令 具体步骤如下：（...阅读全文
<p>Here's an example of what I mean:</p> <pre><code>type person struct { name string age int } func example() *person { return &person{"Frank", 15} } func main() { frank := example() fmt.Println(frank.name) } </code></pre> <p>So what I mean is why would the fun...阅读全文
<p>I'd like to know how you guys deal with JOIN queries in Go.</p> <p>Say you have 2 tables, <code>recipes</code> and <code>ingredients</code> with a one to many relationship, and one struct for each table, with the structs fields mirroring the tables's columns. How would you receive the re...阅读全文
<p>If you were the CTO of a medium-sized technology company and you have decided to use Go as your company's main programming language, which libraries or frameworks would you encourage your team(s) to use? Please base it on the knowledge that these libraries are proven to work well for production-code, their authors won't dis...阅读全文
<hr/>**评论：**<br/><br/>Old_Army90: <pre><p>Some girls with curly hair straighten it and then curl it again.</p> <p>My wife does this. To be fair her natural curls look way different than her post-straightening curls. </p></pre>iamsheriff: <pre><p>Same. I've got a weird frizzy ...阅读全文
<p>CF has an enormous amount of go code (Diego for example) that is all open source. Yet, I've never pulled in a library from CF.</p> <p>I expect must of these large projects solve interesting problems and yield interesting abstractions. Does CF share any of this with the OSS community?</p> <p>I'm sur...阅读全文
<p>Background: I'm a sophomore and computer science major, and I love working with golang. I worked on a privacy-oriented anonymous authentication proxy last summer in go, and want to continue working in Go.</p> <p>Actual Question: What are some companies/institutions that work in Go, and are looking for interns in the Un...阅读全文
<p>I have an application that serves data via an HTTP API from Redshift and RDS that needs to do pretty complicated queries (in the ballpark of 100-200 lines each). Each route needs to SUM, GROUP, ORDER, filter, etc. Is there a "good" or "idiomatic" way of keeping these queries maintainable in Go (or any langua...阅读全文
<p>I've been implementing a few handlers in golang, but I don't like the fact that I have to wrap all the handlers one by one like below</p> <pre><code> mid1(mid2(mid3(app))) </code></pre> <p>Is not that bad, but if I want to remove or add one middleware, it's getting pretty bad.....阅读全文
<p>Hi guys, I'm stuck on this Dep issue that I can't fix, it's probably something stupid that I'm missing, maybe you can give me some hints on it.</p> <p>I've got my Go project running in a Docker container. I install and manage my dependencies with Dep. So far so good until I'm try...阅读全文
<p>I'm a .net developer and want to use Go for microservices for two reasons, single binary and better performance. Recently, someone made a good case to stay with C#. <a href="https://youtu.be/8qjNy8p_TnY?t=16m31s" rel="nofollow">https://youtu.be/8qjNy8p_TnY?t=16m31s</a> </p> <p>tldr; .n...阅读全文
<p>I'm Go noob, and trying to write some functions associated with message handler callbacks for the Paho MQTT client (i.e. what to do when a message is received by the client). This is a two part question, and I've tried to clearly indicate both parts:</p> <p>I need to check the payload data against a whitelist &...阅读全文
# docker * docker容器和宿主os共享一个kernel。 * docker容器使用统一文件系统技术, 在宿主机kernel的基础之上叠加整合了一个单独隔离的文件系统(包含vfs), 因为容器/proc目录和宿主机的/proc目录互相隔离所以, 容器中的进程与宿主机的进程互相隔离。 * docker容器具有虚拟网卡, daemon为docker容器提供了虚拟网络 (支持nat模式), docker容器中的网络可以隔离也可以通过nat和宿主os对外共享ip。 * docker容器中的进程对于宿主os来说, 依旧是一个进程, 只是docker容器对运行在容器中的进程进行了的封装,容器中进程使用容器提供的单独隔离的文件系统, 以及虚拟网卡。 * docker容器主进程运行结束则dock...阅读全文
<p>I'm talking about the fact that deferred functions execute at the end of the enclosing function, not scope. My question is: have you ever directly benefited from this? Has this ever made your code simpler? (Compared to the behaviour when defer would be executed at the end of the scope.)</p> <p>No is a valid answer too ...阅读全文
<p>Hey guys, </p> <p>Does anyone have any links to some (beginner) cool projects I can do in go and deploy on a Raspberry Pi?</p> <hr/>**评论：**<br/><br/>miggimaggi: <pre><p>dns proxy for ad blocking: <a href="https://github.com/seedifferently/nogo" rel="nofollow">https://gi...阅读全文
<p>I was googling around for code examples using the crypto package and found <a href="https://blog.cloudflare.com/go-crypto-bridging-the-performance-gap/" rel="nofollow">this 2014 post on Cloudflare's blog.</a></p> <p>They apparently forked Go and built their own elliptic curves and AES-GCM in...阅读全文
<p>I have a struct, User, shown below:</p> <pre><code> type User struct { DbID string DbUsername string DbPasswordHash string DbPasswordSalt string } </code></pre> <p>I query my database, like so:</p> <pre><code> rows, err := d...阅读全文
<p>With <a href="http://jsonapi.org/">JSON API</a>, it's becoming more standard to let users define the fields they want to receive back from an API call:</p> <p><code>GET /articles?fields[articles]=title,body,author&filter[title]=Go</code></p> <p>One can imagine this a...阅读全文
<p>Do you guys test for coverage when you pass an error along?</p> <p>For a specific example say I'm using database/sql with a driver and I know the driver returns errors. I want to pass those errors along to the caller but I feel that testing these is really testing the driver implementation. </p> <p>Am I wr...阅读全文
<p>Hey <a href="/r/golang">/r/golang</a>,</p> <p>I just started learning ruby/rails about a month ago and noticed that Go has been picking up a lot of traction these days.</p> <p>While I enjoy the syntax of ruby and also the rails community, I'm curious if I should look into Go instead. My...阅读全文
<p>I am curious how do you people work with Go in an enterprise environments when you often need to talk to unknown (often shitty) SOAP endpoints or consume messages from proprietary MQs etc. How do you deal with it ?</p> <hr/>**评论：**<br/><br/>egonelbre: <pre><p>It really doesn't differ much from ot...阅读全文
<p>EDIT: resolved, see bottom.</p> <p>Original post:</p> <hr/> <p>Hi,</p> <p>I've just started learning Go. </p> <p>I know a key design constraint was a minimum specification that could be kept in mind completely. ("less is exponentially more." - Rob Pike)<...阅读全文
<p>I should be specific - this is only one of two ideas I have for what I need to do. Now, I might be able to recompile the program in the background whenever something new is added and it may be possible to do so quickly as long as I'm only adding a few new classes or even objects of an already existing class, but..... Basically, I n...阅读全文
题目描述 输入一个递增排序的数组和一个数字S，在数组中查找两个数，使得他们的和正好是S，如果有多对数字的和等于S，输出两个数的乘积最小的。 示例： 输入：target = 9 输出：[[2,3,4],[4,5]] 思路 1.这道题可以使用“双指针”的思想解决。 2.设置两个指针，分别指向首位两个元素。 当nums[low]+nums[high]==target时，返回双指针对应的数字 当 nums [ low] > target - nums [ high] 时，说明右边的值过大，high- 1 当 nums [ low] < target - nums [ high] 时，说明左边的值过小，low+ 1 Java代码实现 public class Solution { public int...阅读全文
<p>I am learning go and was curious on how to use go maps to solve the conventional fizzbuzz problem, i.e. print number from say, 1-100 and multiples of 3 & 5 get printed fizz and buzz respectively. I looked over a bunch of solutions in different languages but somehow can't produce the same results in go. Thanks in advance.<...阅读全文
<p>I'm in need of writing a text indexer which operates similar to a basic SQL database. Ie, rows/objects of data, and the ability to perform basic queries against that data like <code>columnA==5 && columnB == 6</code>. The rows will be schemaless as well.</p> <p>With that said, i've ne...阅读全文
<p>I read Rob Pike's wonderful post on <a href="https://blog.golang.org/errors-are-values">errors being values</a> and promptly went and wrote an incredibly simple wrapper to abstract my pains away from simple, parameterless functions that only return an error. </p> <p>Cleaned up a lot of my code and i...阅读全文
<p>I’m looking for suggestions/strategy on messaging systems and/or user-group-management systems for my app.</p> <p>The app is all Go in the back-end, with MYSQL db and an API serving JSON to clients (website, Android, iPhone). Hosted on Google Cloud using App Engine. Primary features are event posting+rsvp’ing with event commen...阅读全文
<p>If Haskell is hard to learn, and Go is much easier to learn, especially for programmers experienced with C, C++, Java, Python, etc., is that alone a good enough reason to prefer Go over Haskell? Or are there other, better, reasons to take into account, when making such decisions?</p> <hr/>**评论：**<br/><br/>Shonucic:...阅读全文
<p>First of all, I understand that the "old docker" is still alive in the form of moby. However, the "owners" of docker have chosen to use the brand of docker for a closed "EE" product.</p> <p>This is obviously bad because it splits the community. People will fork away from Moby bec...阅读全文
<p>I am fairly new to programming and this is my first project. Just wanted to share and know what you think.</p> <p><a href="https://github.com/rahulwa/camouflage" rel="nofollow">https://github.com/rahulwa/camouflage</a></p>...阅读全文
<p>Maybe this is a question better suited to a different subreddit, but I'll post here because I'm working in Go. I'm building a back-end for a project I'm working on, which includes a MySQL database. I'm wondering how Go interacts with MySQL, and how I should be handling multiple calls to the database ...阅读全文
<p>Do you know any high quality Go project or package that is basically unknown? Sometimes the author don't bother to post it on Go channels like <a href="/r/golang">/r/golang</a>. Please post it here, other gophers can find it useful.</p> <hr/>**评论：**<br/><br/>mrfrobozz: <pre><p>...阅读全文
<p>Hey all. I'm a hobbyist programmer at best and getting back into programming I decided to tackle Go! I am having a blast with it so far and I'm currently working on sort of a managed job queue. Where you can set up jobs, send them to the queue, and the queue will fire up a MaxActiveJobs number of jobs and wait for them to f...阅读全文
<p>hello - currently thinking about doing something like this <a href="https://play.golang.org/p/7fOLSbQlNr" rel="nofollow">https://play.golang.org/p/7fOLSbQlNr</a> to trim the first n number of elements from an array and I was wanting to make sure that is the best way of doing it. From what I understand of slices ...阅读全文
<p>I'm searching for advice if a graph database may help solve my solution and which options would be overall the best choices. Would dgraph be a good choice for solving this problem?</p> <p>I want to make a graph s.t. projects -> orders -> items, where each node has statistics where each field is aggregated...阅读全文
