【Go区块链开发】手把手教你导入Go语言第三方库 golang区块链区块链开发

作者：ReganYue
来源：恒生LIGHT云社区

一、使用 go get获取
GO的命令 go get让我们可以方便快捷的从网络中下载或更新Go语言包及其依赖文件，并将他们编译和安装。

先在命令行模式下输入go --help,可查看以下信息。

Go is a tool for managing Go source code.Usage:go [arguments]The commands are:bugstart a bug report buildcompile packages and dependencies cleanremove object files and cached files docshow documentation for package or symbol envprint Go environment information fixupdate packages to use new APIs fmtgofmt (reformat) package sources generategenerate Go files by processing source getadd dependencies to current module and install them installcompile and install packages and dependencies listlist packages or modules modmodule maintenance runcompile and run Go program testtest packages toolrun specified go tool versionprint Go version vetreport likely mistakes in packagesUse "go help " for more information about a command.Additional help topics:buildconstraint build constraints buildmodebuild modes ccalling between Go and C cachebuild and test caching environmentenvironment variables filetypefile types go.modthe go.mod file gopathGOPATH environment variable gopath-getlegacy GOPATH go get goproxymodule proxy protocol importpathimport path syntax modulesmodules, module versions, and more module-getmodule-aware go get module-authmodule authentication using go.sum module-privatemodule configuration for non-public modules packagespackage lists and patterns testflagtesting flags testfunctesting functionsUse "go help " for more information about that topic.

我们可以看到 get add dependencies to current module and install them
【【Go区块链开发】手把手教你导入Go语言第三方库】这就是我们今天要用到的东西。
然后查看它的帮助信息：go get --help

usage: go get [-d] [-f] [-t] [-u] [-v] [-fix] [-insecure] [build flags] [packages] Run 'go help get' for details.

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找到我们要获取的库。
复制链接 https://github.com/go-sql-driver/mysql
使用 go get github.com/go-sql-driver/mysql
结果报错：

go: missing Git command. See https://golang.org/s/gogetcmd package github.com/go-sql-driver/mysql: exec: "git": executable file not found in %PATH%

这里要安装Git，博主是安装了Git的，不过这里需要配置一下。

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在系统变量的PATH里面添加Git的bin目录的路径。
然后再运行 go get github.com/go-sql-driver/mysql
现在就成功了。

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这个 github.com/go-sql-driver/mysql被称为远程导入路径，其实go get被称为远程动态导入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安装。

仓库名	VCS	VCS	VCS
BitBucket	Mercurial	Git
GitHub	Git
Google Code Project Hosting	Git	Mercurial	Subversion
Launchpad	Bazaar

一般情况下，代码包远程导入路径中的第一个元素就是代码托管网站的主域名。在静态分析的时候，go get命令会将代码包远程导入路径与预置的代码托管站点的主域名进行匹配。如果匹配成功，则在对代码包远程导入路径的初步检查后返回正常的返回值或错误信息。如果匹配不成功，则会再对代码包远程导入路径进行动态分析。
二、直接下载GO库
在 github 或者其他地方下载Go库。

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然后在系统变量查看GOPATH。
然后打开GOPATH的src目录
将文件复制进去。

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然后就成功获取了。
三、参数介绍

usage: go get [-d] [-f] [-t] [-u] [-v] [-fix] [-insecure] [build flags] [packages] Run 'go help get' for details.

然后我们可以看一看 go help get里有关参数的介绍。

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 that each package has been checked out from the source control repository implied by its import path. This can be useful if the source is a local fork of the original.The -fix flag instructs get to run the fix tool on the downloaded packages before resolving dependencies or building the code.The -insecure flag permits fetching from repositories and resolving custom domains using insecure schemes such as HTTP. Use with caution.The -t flag instructs get to also download the packages required to build the tests for the specified packages.The -u flag instructs get to use the network to update the named packages and their dependencies. By default, get uses the network to check out missing packages but does not use it to look for updates to existing packages.The -v flag enables verbose progress and debug output.

简单来说就是：