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Must-read for Golang programmers: Summary of commonly used libraries and practical applications
Introduction:
Go language (Golang) is a powerful statically typed programming language , its concise syntax and efficient performance make it widely used in various fields. As a Golang programmer, it is very important to understand and master some commonly used libraries to improve development efficiency and code quality. This article will introduce some commonly used Golang libraries and give specific practical application examples.
1. Network development library
package main import ( "fmt" "net/http" ) func mainHandler(w http.ResponseWriter, r *http.Request) { fmt.Fprint(w, "Hello, World!") } func main() { http.HandleFunc("/", mainHandler) http.ListenAndServe(":8080", nil) }
package main import "github.com/gin-gonic/gin" func main() { r := gin.Default() r.GET("/", func(c *gin.Context) { c.String(http.StatusOK, "Hello, World!") }) r.Run(":8080") }
2. Database operation library
package main import ( "database/sql" "fmt" _ "github.com/go-sql-driver/mysql" ) func main() { db, err := sql.Open("mysql", "user:password@tcp(host:port)/database") if err != nil { fmt.Println("Failed to connect to database:", err) return } defer db.Close() rows, err := db.Query("SELECT * FROM users") if err != nil { fmt.Println("Failed to query from database:", err) return } defer rows.Close() for rows.Next() { var id int var name string err := rows.Scan(&id, &name) if err != nil { fmt.Println("Failed to scan rows:", err) return } fmt.Println("ID:", id, "Name:", name) } }
package main import ( "fmt" "gorm.io/driver/mysql" "gorm.io/gorm" ) type User struct { ID uint Name string } func main() { dsn := "user:password@tcp(host:port)/database" db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{}) if err != nil { fmt.Println("Failed to connect to database:", err) return } defer db.Close() var users []User result := db.Find(&users) if result.Error != nil { fmt.Println("Failed to query from database:", result.Error) return } for _, user := range users { fmt.Println("ID:", user.ID, "Name:", user.Name) } }
3. Log processing library
package main import ( "log" "os" ) func main() { file, err := os.Create("app.log") if err != nil { log.Fatal("Failed to create log file:", err) } defer file.Close() log.SetOutput(file) log.Println("This is a log message") }
package main import "go.uber.org/zap" func main() { logger, _ := zap.NewProduction() defer logger.Sync() logger.Info("This is a log message") }
Summary:
This article introduces common Golang libraries in network development, database operations and log processing, and gives specific instructions. Practical application examples. Mastering these common libraries will help improve development efficiency and code quality. I hope it will be helpful to Golang programmers!
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