> 作者：ReganYue
> 
> 來源：[恆生LIGHT雲社群](https://developer.hs.net/thread/1350 "恆生LIGHT雲社群")

### 一、使用 go get獲取

**GO的命令** `go get`**讓我們可以方便快捷的從網路中下載或更新Go語言包及其依賴檔案，並將他們編譯和安裝。**

1. **先在命令列模式下輸入**`go --help`**,可檢視以下資訊。**

```
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.
```

**我們可以看到** `get         add dependencies to current module and install them`

**這就是我們今天要用到的東西。**

**然後檢視它的幫助資訊：**`go get --help`

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

```

![](https://raw.githubusercontent.com/ReganYue/ForPicGo/main/image-20210726152705690.png)![](https://raw.githubusercontent.com/ReganYue/ForPicGo/main/image-20210726152705690.png)![image-20210726152705690.png](https://developer.hs.net/storage/attachments/2021/09/03/vG1448tgYScQxGVkHC6O2XoTUiZ1pxrka2G7zvPv_thumb.png "3048")

**找到我們要獲取的庫。**

**複製連結** `https://github.com/go-sql-driver/mysql`

**使用** `go get github.com/go-sql-driver/mysql`

**結果報錯：**

```
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%
```

**這裡要安裝Git，博主是安裝了Git的，不過這裡需要配置一下。**

![image-20210726154436036.png](https://developer.hs.net/storage/attachments/2021/09/03/aI4mIw9CVutXQXySYXSzDYYTtYz23kPn4pL0Nhgq_thumb.png "3049")

**在系統變數的PATH裡面新增Git的bin目錄的路徑。**

**然後再執行** `go get github.com/go-sql-driver/mysql`

**現在就成功了。**

![image-20210726161603111.png](https://developer.hs.net/storage/attachments/2021/09/03/QsU1zwkMMgHH2rJ8lKMnkvM4gWHlp0fatBo0baCY_thumb.png "3050")

**這個** `github.com/go-sql-driver/mysql`**被稱為遠端匯入路徑，其實go get被稱為遠端動態匯入GO包。其實** `go get`**乾的事就是從分散式版本控制系統的倉庫中找出程式碼包並將它編譯以及安裝。**

| **倉庫名**                      | **VCS**       | **VCS**       | **VCS**        |
| ------------------------------------- | ------------------- | ------------------- | -------------------- |
| **BitBucket**                   | **Mercurial** | **Git**       |                      |
| **GitHub**                      | **Git**       |                     |                      |
| **Google Code Project Hosting** | **Git**       | **Mercurial** | **Subversion** |
| **Launchpad**                   | **Bazaar**    |                     |                      |

**一般情況下，程式碼包遠端匯入路徑中的第一個元素就是程式碼託管網站的主域名。在靜態分析的時候，**`go get`**命令會將程式碼包遠端匯入路徑與預置的程式碼託管站點的主域名進行匹配。如果匹配成功，則在對程式碼包遠端匯入路徑的初步檢查後返回正常的返回值或錯誤資訊。如果匹配不成功，則會再對程式碼包遠端匯入路徑進行動態分析。**

### **二、直接下載GO庫**

**在 github 或者其他地方下載Go庫。**

![image-20210726161937963.png](https://developer.hs.net/storage/attachments/2021/09/03/dj989Q3b2bfeiA7lER4DatgzhgWzxHwRhSbjdQIo_thumb.png "3051")

**然後在系統變數檢視GOPATH。**

**然後開啟GOPATH的src目錄**

**將檔案複製進去。**

![image-20210726162136242.png](https://developer.hs.net/storage/attachments/2021/09/03/YXyUKMxgGJCg9Hh0PGqw7YnjnXin1MHxBxS9TyPm_thumb.png "3052")

**然後就成功獲取了。**

### **三、引數介紹**

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

**然後我們可以看一看** `go help get`**裡有關引數的介紹。**

```
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.
```

**簡單來說就是：**

* **-d 下載完成後就停止工作，不安裝庫**
* **-f 這個引數只有在使用了-u 引數時才有用，強制-u不去驗證import的每一個包是否已經獲取了，這對本地fork的包非常有用。**
* **-fix 這個-fix參數列示在解決依賴關係或構建程式碼之前先執行fix工具。**
* **-insecure 該引數允許透過不安全（例如 HTTP）的自定義域獲取並解析使用儲存庫。**
* **-t 該引數允許在下載該包時也下載測試該包需要的包。**
* **-u 引數允許 get 使用網路來更新包以及它們的依賴。預設情況下，get 使用網路檢查丟失的包，但不使用它來查詢現有包的更新。**
* **-v 啟用詳細進度和除錯資訊輸出。**</topic></command></command>

【Go區塊鏈開發】手把手教你匯入Go語言第三方庫

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