CODEWITHSUNDEEP
phparraysgomultidimensional-array
btc user
btc user

Reputation: 233

how to insert data into multi dimension array in golang?

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 :)

Upvotes: 3

Views: 1392

Answers (4)

saddam
saddam

Reputation: 829

As you defined here your arrDetails variable as multidimentional slice as [][]string.It means you can not assign a string into its keys while you can assign string as a value.

You can do your code like below I mentioned.

package main

import (
    "fmt"
)

func main() {
  var arrDetails [][]string
  var s []string
  var index int
  for i:=0; i<5;i++ {
     s = []string{"001", "cust_001", "open", "200"}
     arrDetails = append(arrDetails, s)
     index++
  } 
fmt.Printf("Hello, playground %+v", arrDetails )
}

Or if you want keys and value pair then you've to use map as:

var arrDetails map[string]string

Upvotes: 0

Alex Medveshchek
Alex Medveshchek

Reputation: 665

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

Upvotes: 2

liao yu
liao yu

Reputation: 61

you can try this:

import "fmt"

func main() {

    var arrDetails []map[string]string
    var index int = 0

    //for _, orderdetails := range ordersfromdb {
    for i:=0; i<5;i++ {
        detail := make(map[string]string)

        detail["OrderNumber"] = "001"
        detail["customernum"] = "cust_001"
        detail["orderstatus"] = "open"
        detail["orderprice"] = "200"
        arrDetails = append(arrDetails, detail)

        index++
    }
    fmt.Printf("Hello, playground %+v", arrDetails )
}

Upvotes: 0

btc user
btc user

Reputation: 233

As per volker suggestion in the comment, I'm fill the multi dimensional array as below

arrDetails[index][0] = "001"
arrDetails[index][1] = "cust_001"
arrDetails[index][2] = "open"
arrDetails[index][3] = "200"

Upvotes: 0

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