“Go”的版本间的差异

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=周边使用=
 
=周边使用=
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==what should be the values of GOPATH and GOROOT?==
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Here is a my simple setup:
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<soruce lang='text'>
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directory for go related things: ~/programming/go
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directory for go compiler/tools: ~/programming/go/go-1.4
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directory for go software      : ~/programming/go/packages
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</soruce>
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GOROOT, GOPATH, PATH are set as following:
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<source lang='bash'>
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export GOROOT=/home/user/programming/go/go-1.4
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export GOPATH=/home/user/programming/go/packages
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export PATH=$PATH:$GOROOT/bin:$GOPATH/bin
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</source>
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So, in short:
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GOROOT is for compiler/tools that comes from go installation.
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GOPATH is for your own go projects / 3rd party libraries (downloaded with "go get").
  
 
==What's the recommended way to connect to MySQL from Go?==
 
==What's the recommended way to connect to MySQL from Go?==

2016年9月28日 (三) 01:57的版本

语言相关

Array、Slice、Map和Set使用详解

http://www.jb51.net/article/56828.htm

  1. 数组是 slice 和 map 的底层结构。
  2. slice 是 Go 里面惯用的集合数据的方法,map 则是用来存储键值对。
  3. 内建函数 make 用来创建 slice 和 map,并且为它们指定长度和容量等等。slice 和 map 字面值也可以做同样的事。
  4. slice 有容量的约束,不过可以通过内建函数 append 来增加元素。
  5. map 没有容量一说,所以也没有任何增长限制。
  6. 内建函数 len 可以用来获得 slice 和 map 的长度。
  7. 内建函数 cap 只能作用在 slice 上。
  8. 可以通过组合方式来创建多维数组和 slice。map 的值可以是 slice 或者另一个 map。slice 不能作为 map 的键。
  9. 在函数之间传递 slice 和 map 是相当廉价的,因为他们不会传递底层数组的拷贝。

How to print struct variables in console?

fmt.Printf("%+v\n", users)

From the fmt package:

when printing structs, the plus flag (%+v) adds field names.

IDE

  • idea安装go插件(推荐)
  • sublime + gosublime

周边使用

what should be the values of GOPATH and GOROOT?

Here is a my simple setup:

<soruce lang='text'> directory for go related things: ~/programming/go directory for go compiler/tools: ~/programming/go/go-1.4 directory for go software  : ~/programming/go/packages </soruce>

GOROOT, GOPATH, PATH are set as following:

export GOROOT=/home/user/programming/go/go-1.4
export GOPATH=/home/user/programming/go/packages
export PATH=$PATH:$GOROOT/bin:$GOPATH/bin

So, in short:

GOROOT is for compiler/tools that comes from go installation.

GOPATH is for your own go projects / 3rd party libraries (downloaded with "go get").

What's the recommended way to connect to MySQL from Go?

A few drivers are available but you should only consider those that implement the database/sql API as

  • it provides a clean and efficient syntax,
  • it ensures you can later change the driver without changing your code, apart the import and connection.

Two fast and reliable drivers are available for MySQL :

  • MyMySQL
  • Go-MySQL-Driver

I've used both of them in production, programs are running for months with connection numbers in the millions without failure.

Revel

  1. 路由、控制器、模板概览
  2. 控制器里的变量传给模板
  3. 以输出json:array、struct、slice操作
  4. 连接数据库、把数据库数据整理为struct
  5. 在控制台显示带键值的struct,fmt.Printf()
  6. 输出json,键值首字母要大写,否则内容为空。
  7. 在模板显示数据库记录。
  8. 用生产模式运行项目

其它疑问

  1. 如何编译linux版本?
  2. 如何部署生产?
  3. 如何配置虚拟站点?使用nginx。