Learn Go language back-end development skills from scratch

Title: Learn Go language back-end development skills from scratch

With the increasing development of Internet technology, back-end development, as an important part of Internet products, also Much attention. As a programming language with high development efficiency and superior performance, Go language is favored by software developers. This article will learn Go language back-end development skills from scratch and provide specific code examples to help readers quickly master relevant knowledge.

1. Introduction to Go language

Go language is an open source programming language developed by Google. Its design goal is to combine the safety of static languages ​​with the ease of use of dynamic languages. Go language has fast compilation speed and execution speed, supports concurrent programming, and is suitable for building high-performance back-end services.

2. Environment setup

First of all, we need to set up a Go language development environment in the local environment. You can go to the official website (https://golang.org) to download the Go language installation package and install it according to the official documentation.

After the installation is completed, enter the following command through the command line tool to check whether the installation is successful:

go version

3. Hello World example

Next, let’s write the first Go language program, a classic Hello World example:

package main

import "fmt"

func main() {
    fmt.Println("Hello, World!")
}

Use the following command in the command line to run the program:

go run hello.go

4. HTTP server example

Go language Its power lies in its support for network programming. Let's write a simple HTTP server example:

package main

import (
    "fmt"
    "net/http"
)

func handler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Hello, World!")
}

func main() {
    http.HandleFunc("/", handler)
    http.ListenAndServe(":8080", nil)
}

After running the program, visit http://localhost:8080 in the browser to see the output results.

5. Database connection example

In back-end development, it is often necessary to interact with the database. The following is a sample code that connects to a MySQL database and executes a query:

package main

import (
    "database/sql"
    "fmt"
    _ "github.com/go-sql-driver/mysql"
)

func main() {
    db, err := sql.Open("mysql", "username:password@tcp(localhost:3306)/dbname")
    if err != nil {
        panic(err)
    }
    defer db.Close()

    rows, err := db.Query("SELECT * FROM users")
    if err != nil {
        panic(err)
    }

    for rows.Next() {
        var id int
        var name string
        err = rows.Scan(&id, &name)
        if err != nil {
            panic(err)
        }
        fmt.Printf("ID: %d, Name: %s
", id, name)
    }
}

Conclusion

Through the above sample code, readers can have a preliminary understanding of the basic knowledge of Go language back-end development, including simple program writing , HTTP server construction and database operations. I hope this article can help readers quickly get started with Go language back-end development and stimulate more interest in learning and practice. I hope readers will continue to move forward on the road of technology and improve their programming skills!

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