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 packages
Use "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 functions
Use "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/gogetcmd
package 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 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。