Go language library collection: allows you to easily call feature-rich third-party libraries

Go language has a large number of third-party libraries to provide developers with ready-to-use solutions. This article introduces the following popular libraries and practical cases: Network: net/http: used to build and process HTTP services and clients. Database: github.com/go-sql-driver/mysql: Provides native support for MySQL database. Data processing: github.com/json-iterator/go: An efficient JSON codec. Tools: github.com/stretchr/testify: A unit testing framework that provides assertions and utility functions.

Go language library encyclopedia: providing you with feature-rich third-party libraries

The power of Go language lies in its rich ecosystem and large number of Third-party libraries. These libraries provide developers with out-of-the-box solutions to easily extend the functionality of their applications. This article will introduce some of the most popular and widely used libraries in the Go language and provide practical examples to illustrate their usage.

Network

• net/http: Provides the tools needed to build and work with HTTP servers and clients.

  • Practical case: Create a simple HTTP server endpoint to handle incoming requests.

    package main
    
    import (
    "log"
    "net/http"
    )
    
    func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        w.Write([]byte("Hello, world!"))
    })
    
    log.Fatal(http.ListenAndServe(":8080", nil))
    }

Database

• ##github.com/go-sql-driver/mysql： Provides native support for MySQL database.

  • Practical case: Connect to the MySQL database and query the data.

    package main
    
    import (
    "database/sql"
    "fmt"
    
    _ "github.com/go-sql-driver/mysql"
    )
    
    func main() {
    db, err := sql.Open("mysql", "user:password@tcp(localhost:3306)/database")
    if err != nil {
        panic(err)
    }
    
    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.Println(id, name)
    }
    }

Data processing

• ##github.com/json-iterator/go

  : 1 A high-performance JSON codec that is more efficient than the standard library's encoding/json.

  • Practical case:

    Use jsoniter to encode and decode the structure into a JSON string. <pre class='brush:php;toolbar:false;'>package main import ( &quot;encoding/json&quot; &quot;fmt&quot; &quot;github.com/json-iterator/go&quot; ) type User struct { ID int Name string } func main() { user := User{1, &quot;John Doe&quot;} b, err := jsoniter.Marshal(user) if err != nil { panic(err) } var decodedUser User err = jsoniter.Unmarshal(b, &amp;decodedUser) if err != nil { panic(err) } fmt.Println(decodedUser) }</pre>

Tools

##github.com/stretchr/testify
• : A comprehensive unit A testing framework that provides various assertions and utility functions.
  Practical case:
  • Create a unit test to check whether the function returns the expected value.

    package main
    
    import (
    "testing"
    
    "github.com/stretchr/testify/assert"
    )
    
    func Sum(a, b int) int {
    return a + b
    }
    
    func TestSum(t *testing.T) {
    assert.Equal(t, 3, Sum(1, 2))
    }

  Extensions

The library ecosystem for the Go language continues to grow. In addition to the libraries listed above, there are many other libraries that are widely used. You can find more information in the following resources:

Official Go package documentation: https://pkg.go.dev

List of third-party libraries for newbies to Go: https: //github.com/avelino/awesome-go
• Awesome Go：https://github.com/go-zh/go-awesome

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