How to store in golang

The process of storage in golang is: 1. Create a Go sample file and import JSON data; 2. Define a Person structure type; 3. Start the program through the "main" function and read the name For all the data in the "people.json" file and store it in the data variable; 4. Create an empty Person type slice people and store the result in the &people pointer; 5. Output through "fmt.Printf()" The value of the people variable.

Operating system for this tutorial: Windows 10 system, Go1.20.1 version, Dell G3 computer.

Golang usually stores and reads data by using standard libraries and third-party libraries such as built-in encoding, json and database/sql.

Below we will introduce some sample code to demonstrate how to use these libraries to store and retrieve data.

Store to file:

The following is a sample code to store JSON data to a file:

package main
import (
"encoding/json"
"fmt"
"io/ioutil"
)
type Person struct {
Name string `json:"name"`
Age  int    `json:"age"`
}
func main() {
people := []Person{
Person{"Alice", 25},
Person{"Bob", 30},
}
data, err := json.Marshal(people)
if err != nil {
panic(err)
}
err = ioutil.WriteFile("people.json", data, 0644)
if err != nil {
panic(err)
}
fmt.Println("Data saved to file.")
}

This example uses the json.Marshal() function Convert the People slice to JSON bytes and write to disk using ioutil.WriteFile().

Read file:

The following is a sample code that reads JSON data from a file and parses it into a structure slice:

package main
import (
"encoding/json"
"fmt"
"io/ioutil"
)
type Person struct {
Name string `json:"name"`
Age  int    `json:"age"`
}
func main() {
data, err := ioutil.ReadFile("people.json")
if err != nil {
panic(err)
}
var people []Person
err = json.Unmarshal(data, &people)
if err != nil {
panic(err)
}
fmt.Printf("%+v\n", people)
}

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