In-depth understanding of Go language application development technology

In-depth understanding of Go language application development technology requires specific code examples

With the rapid development of the Internet and mobile applications, programming languages ​​​​are also constantly evolving. Go language, as a programming language developed by Google, is favored by developers for its simplicity, efficiency and excellent concurrency performance. It is crucial to have an in-depth understanding of Go language application development technology and master specific code examples.

1. Concurrent programming: Concurrent programming of Go language is one of its biggest features. Using goroutine and channel can easily implement concurrent programming and improve program performance. The following code example demonstrates how to use goroutine to implement concurrent computing:

package main

import (
    "fmt"
    "time"
)

func sum(a []int, c chan int) {
    sum := 0
    for _, v := range a {
        sum += v
    }
    c <- sum
}

func main() {
    a := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
    c := make(chan int)
    go sum(a[:len(a)/2], c)
    go sum(a[len(a)/2:], c)
    x, y := <-c, <-c

    fmt.Println(x, y, x+y)
}

2. Network programming: Go language is also very powerful in network programming and provides a wealth of network libraries and tools. The following code example shows how to use Go language to create a simple web server:

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)
}

3. Database operation: Go language supports multiple database operations through third-party libraries such as database/sqlYou can easily interact with MySQL, PostgreSQL and other databases. The following code example demonstrates how to connect to a MySQL database and perform query operations:

package main

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

func main() {
    db, err := sql.Open("mysql", "root:@tcp(127.0.0.1:3306)/testdb")
    if err != nil {
        fmt.Println(err)
    }
    defer db.Close()

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

    for rows.Next() {
        var id int
        var name string
        err = rows.Scan(&id, &name)
        if err != nil {
            fmt.Println(err)
        }
        fmt.Println(id, name)
    }
}

In summary, an in-depth understanding of Go language application development technology requires mastering knowledge of concurrent programming, network programming, and database operations, and through Specific code examples deepen understanding. With in-depth study and practice of Go language technology, developers can become more proficient in applying Go language for application development and achieve efficient and stable applications.

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