Home > Article > Backend Development > How to custom handle errors in Golang?
The custom method for handling Golang errors is to create a custom error type and implement the error.Error interface. In practical cases, use a custom error handler to specify error information more specifically for easier debugging and handling.
#How to custom handle errors in Golang?
Golang provides built-in error handling mechanism, but sometimes you may need to customize error handling. This tutorial will teach you how to create custom error handlers and apply them in real-world use cases.
Custom error handler
To create a custom error handler, use the error.Error
interface. This interface accepts a string type error description as a parameter.
package myerrors import "fmt" type MyError struct { errorString string } func (e *MyError) Error() string { return e.errorString } func NewMyError(errorString string) error { return &MyError{errorString: errorString} }
NewMyError
The function returns a MyError
type that implements the error
interface. Error
The method returns an error description string.
Practical case: Validating user input
Suppose we have a function ValidateUserInput
, which validates user input and returns an error if the input is invalid.
package main import ( "fmt" "log" "myerrors" ) func ValidateUserInput(input string) error { if input == "" { return myerrors.NewMyError("输入为空") } if len(input) < 5 { return myerrors.NewMyError("输入长度太短") } return nil } func main() { input := "Golang" err := ValidateUserInput(input) if err != nil { log.Fatalf("输入验证失败: %v", err) } fmt.Println("输入已验证成功") }
In the ValidateUserInput
function, we create a custom error using the NewMyError
function. We then check for errors in the main
function and print the appropriate error message.
By using a custom error handler, we can specify error information more specifically, making it easier to debug and handle.
The above is the detailed content of How to custom handle errors in Golang?. For more information, please follow other related articles on the PHP Chinese website!