Golang language quickly get started to comprehensive practical notes (go language, beego framework, high concurrency chat room, crawler)

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1.go get The essence is : Code management tools (git) + go install

2.struct

go There is no language private,public,protected Such keywords To make a symbol for another package package so ( You can visit ), You need to define the symbol to start with an uppercase letter

package main

import "fmt"

type Person struct {
	name string
	age  int
}

type Student struct {
	Person // Anonymous field , Default includes person All fields in 
	sex    string
}

func main() {
	//person:=Person{"zhangsan",25} //{zhangsan 25}
	//person := Person{age: 22, name: "lxw"}

	//stu1 := Student{Person{name: "test", age: 11},  " male "}
	stu1 := Student{Person{"test", 113},  " male "}

	//fmt.Printf("%v", person)
	fmt.Printf("%v", stu1.Person.age)//113
	fmt.Printf("%v", stu1.name)//test
	fmt.Printf("%v", stu1.age)//113
	fmt.Printf("%v", stu1.sex)// male 
}

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3. object-oriented

3、 ... and . common problem

go: cannot use [email protected] syntax in GOPATH mode Problem solving

problem ： perform go get github.com/golang/protobuf/[email protected] Times wrong

go get github.com/golang/protobuf/[email protected]
go: cannot use [email protected] syntax in GOPATH mode

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solve ： Need to open GO111MODULE, The default is auto, open .zshrc,（ Be careful ： Check which one you are currently using shell, yes bash It is necessary .bash_profile Editor in chief ） add to export GO111MODULE=on that will do . After the revision, remember source

export GO111MODULE=on

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source

source ~/.zshrc

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reason ：

go mod Can pass GO111MODULE To control whether to enable ,GO111MODULE There are three types . on All the builds , All use Module Mechanism off All the builds , Not used Module Mechanism , But use GOPATH and Vendor auto stay GOPATH The next project , Don't use Module Mechanism , be not in GOPATH Project use under

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