golang uuid return string

In Golang, UUID is a very important type, which is used to generate unique identifiers. When dealing with UUIDs, we often need to convert them into string types. This article will introduce how to convert UUID to string type in Golang.

1. Use the fmt.Sprintf function

fmt.Sprintf allows developers to convert UUID into a string by formatting the string. For specific implementation, please refer to the following code:

package main

import (
    "fmt"
    "github.com/google/uuid"
)

func main() {
    id := uuid.New()
    str := fmt.Sprintf("%s", id)
    fmt.Println(str)
}

Among them, uuid.New is used to generate UUID, and fmt.Sprintf("%s", id) is used to convert UUID into a string. This method is simple and easy, but if you accidentally use the wrong format string, it may cause program errors.

2. Using the String() function

uuid.UUID type provides the String() function, which can directly convert UUID to a string. For specific implementation, please refer to the following code:

package main

import (
    "fmt"
    "github.com/google/uuid"
)

func main() {
    id := uuid.New()
    str := id.String()
    fmt.Println(str)
}

This method is relatively simple and does not require you to write the conversion function yourself. However, if a large number of UUIDs are converted into strings, this method may affect performance.

3. Use the strconv.Itoa function

If you need to convert an integer part of the UUID into a string, you can use the strconv.Itoa function. For specific implementation, please refer to the following code:

package main

import (
    "fmt"
    "github.com/google/uuid"
    "strconv"
)

func main() {
    id := uuid.New()
    a, b, c, d, e := id.ClockSequence(), id.Node(), id.Time(), id.Version(), id.Variant()

    str := "UUID{" +
        strconv.Itoa(a) + "," +
        fmt.Sprintf("%x", b) + "," +
        fmt.Sprintf("%v", c) + "," +
        strconv.Itoa(int(d)) + "," +
        strconv.Itoa(int(e)) +
        "}"

    fmt.Println(str)
}

In the above code, we use fmt.Sprintf to convert b and c into strings, and use the strconv.Itoa function to convert a, d, and e. This method can meet specific needs, but it requires manual splicing of strings, which is more complicated to process.

Conclusion:

The above three methods are all feasible solutions for converting UUID into strings. The specific implementation depends on the usage scenario and can be used selectively. No matter which method is used, pay attention to the one-to-one correspondence between UUID and string to avoid overly simple string conversion.

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