如何在golang中将数据插入多维数组？

Question

I have a dynamic multi dimension array, I need to fill dynamically from the loop. how can i define the array and fill the data.

Here is the code which im trying

var arrDetails[][]string
var index int = 0
for _, orderdetails := range ordersfromdb {
    arrDetails[index]["OrderNumber"] = "001"
    arrDetails[index]["customernum"] = "cust_001"
    arrDetails[index]["orderstatus"] = "open"
    arrDetails[index]["orderprice"] = "200"
    index++
}

error which im facing:

non-integer slice index "OrderNumber"
non-integer slice index "customernum"
non-integer slice index "orderstatus"
non-integer slice index "orderprice"

I have done the same in php and works perfect:

for ($i=0;$i<5:$i++)
{
     $arr_orderdetails[$i]["OrderNumber"] = "001";
     $arr_orderdetails[$i]["customernum"] = "cust_001";
     $arr_orderdetails[$i]["orderstatus"] = "open";
     $arr_orderdetails[$i]["orderprice"] = "200";
}

I'm new to golang, not able to find where it is going wrong, any help much appreciated.

Thanks :)

Answer 1

Let's consider this solution:

arrDetails := map[int]map[string]string{}

index := 0
for _, orderdetails := range ordersfromdb {
    arrDetails[index] = map[string]string{} // you have to initialize map

    arrDetails[index]["OrderNumber"] = "001"
    arrDetails[index]["customernum"] = "cust_001"
    arrDetails[index]["orderstatus"] = "open"
    arrDetails[index]["orderprice"] = "200"

    index++
}

To convert results to json (as I saw you question in comment to @liao yu's answer), we should learn something more about tags:

import (
    "encoding/json"
    "fmt"
)

type OrderDetails struct {
    Number   string `json:"number"`
    Customer string `json:"customer"`
    Status   string `json:"status"`
    Price    string `json:"price"`
}

func main() {
    ordersfromdb := []int{1, 2, 3}

    var arrDetails []OrderDetails
    for _, v := range ordersfromdb {
        arrDetails = append(arrDetails, OrderDetails{
            Number:   fmt.Sprintf("order_number_%v", v),
            Customer: fmt.Sprintf("customer_%v", v),
            Status:   fmt.Sprintf("order_status_%v", v),
            Price:    fmt.Sprintf("$%v", v),
        })
    }

    data, err := json.Marshal(arrDetails)
    if err != nil {
        panic(err)
    }
    fmt.Println(string(data))
}

See it on playground: https://play.golang.org/p/IA0G53YX_dZ