作者：ReganYue
起源：恒生LIGHT云社区
一、应用 go get获取
GO的命令 go get让咱们能够方便快捷的从网络中下载或更新Go语言包及其依赖文件，并将他们编译和装置。
- 先在命令行模式下输出
go --help,可查看以下信息。
Go is a tool for managing Go source code.Usage: go <command> [arguments]The commands are: bug start a bug report build compile packages and dependencies clean remove object files and cached files doc show documentation for package or symbol env print Go environment information fix update packages to use new APIs fmt gofmt (reformat) package sources generate generate Go files by processing source get add dependencies to current module and install them install compile and install packages and dependencies list list packages or modules mod module maintenance run compile and run Go program test test packages tool run specified go tool version print Go version vet report likely mistakes in packagesUse "go help <command>" for more information about a command.Additional help topics: buildconstraint build constraints buildmode build modes c calling between Go and C cache build and test caching environment environment variables filetype file types go.mod the go.mod file gopath GOPATH environment variable gopath-get legacy GOPATH go get goproxy module proxy protocol importpath import path syntax modules modules, module versions, and more module-get module-aware go get module-auth module authentication using go.sum module-private module configuration for non-public modules packages package lists and patterns testflag testing flags testfunc testing functionsUse "go help <topic>" for more information about that topic.咱们能够看到 get add dependencies to current module and install them
这就是咱们明天要用到的货色。
而后查看它的帮忙信息：go get --help
usage: go get [-d] [-f] [-t] [-u] [-v] [-fix] [-insecure] [build flags] [packages]Run 'go help get' for details.找到咱们要获取的库。
复制链接 https://github.com/go-sql-driver/mysql
应用 go get github.com/go-sql-driver/mysql
后果报错：
go: missing Git command. See https://golang.org/s/gogetcmdpackage github.com/go-sql-driver/mysql: exec: "git": executable file not found in %PATH%这里要装置Git，博主是装置了Git的，不过这里须要配置一下。
在零碎变量的PATH外面增加Git的bin目录的门路。
而后再运行 go get github.com/go-sql-driver/mysql
当初就胜利了。
这个 github.com/go-sql-driver/mysql被称为近程导入门路，其实go get被称为近程动静导入GO包。其实 go get干的事就是从分布式版本控制系统的仓库中找出代码包并将它编译以及装置。
| 仓库名 | VCS | VCS | VCS |
|---|---|---|---|
| BitBucket | Mercurial | Git | |
| GitHub | Git | ||
| Google Code Project Hosting | Git | Mercurial | Subversion |
| Launchpad | Bazaar |
个别状况下，代码包近程导入门路中的第一个元素就是代码托管网站的主域名。在动态剖析的时候，go get命令会将代码包近程导入门路与预置的代码托管站点的主域名进行匹配。如果匹配胜利，则在对代码包近程导入门路的初步查看后返回失常的返回值或错误信息。如果匹配不胜利，则会再对代码包近程导入门路进行动态分析。
二、间接下载GO库
在 github 或者其余中央下载Go库。
而后在零碎变量查看GOPATH。
而后关上GOPATH的src目录
将文件复制进去。
而后就胜利获取了。
三、参数介绍
usage: go get [-d] [-f] [-t] [-u] [-v] [-fix] [-insecure] [build flags] [packages]Run 'go help get' for details.而后咱们能够看一看 go help get里无关参数的介绍。
The -d flag instructs get to stop after downloading the packages; that is,it instructs get not to install the packages.The -f flag, valid only when -u is set, forces get -u not to verify thateach package has been checked out from the source control repositoryimplied by its import path. This can be useful if the source is a local forkof the original.The -fix flag instructs get to run the fix tool on the downloaded packagesbefore resolving dependencies or building the code.The -insecure flag permits fetching from repositories and resolvingcustom domains using insecure schemes such as HTTP. Use with caution.The -t flag instructs get to also download the packages required to buildthe tests for the specified packages.The -u flag instructs get to use the network to update the named packagesand their dependencies. By default, get uses the network to check outmissing packages but does not use it to look for updates to existing packages.The -v flag enables verbose progress and debug output.简略来说就是：
- -d 下载实现后就进行工作，不装置库
- -f 这个参数只有在应用了-u 参数时才有用，强制-u不去验证import的每一个包是否曾经获取了，这对本地fork的包十分有用。
- -fix 这个-fix参数示意在解决依赖关系或构建代码之前先运行fix工具。
- -insecure 该参数容许通过不平安（例如 HTTP）的自定义域获取并解析应用存储库。
- -t 该参数容许在下载该包时也下载测试该包须要的包。
- -u 参数容许 get 应用网络来更新包以及它们的依赖。默认状况下，get 应用网络查看失落的包，但不应用它来查找现有包的更新。
- -v 启用具体进度和调试信息输入。