I have two structs. One is for Lottery and one is for Reward. I am using Mysql database. I want to read data from database and write in JSON format. I can able to do that, but i want to have a nested struct where I want to iterate Reward struct within Lottery struct. Can I do that?
Here is my Lottery and Reward struct
type Lottery struct{
Id int `json:"lottery_id"`
Lottery string `json:"lottery_name"`
Description string `json:"lottery_description"`
Reward []Rew `json:"rewards"`
}
type Rew struct{
Id int `json:"reward_id"`
RewardName string `json:"reward_name"`
Description string `json:"reward_description"`
Asset int `json:"reward_asset"`
AssetName string `json:"reward_asset_name"`
}
Here is my code
app.Get("/lottery/{id:int}", func (ctx iris.Context){
id1 := ctx.Params().GetIntDefault("id",0)
stmtOut, err := db.Prepare("select lottery_name, lottery_description from lottery_table where id = ?")
if err !=nil{
panic(err.Error())
}
defer stmtOut.Close()
var lottery_name, lottery_description string
err1 := stmtOut.QueryRow(id1).Scan(&lottery_name,&lottery_description)
if err != nil{
panic(err1.Error())
}
stmtOut1, err := db.Query("select id, reward_name, reward_description, reward_asset, reward_asset_name from rewards_table where lottery_id = ?",id1)
if err != nil{
panic(err.Error())
}
defer stmtOut1.Close()
for stmtOut1.Next() {
var id, reward_asset int
var reward_name, reward_description, reward_asset_name string
err2 := stmtOut1.Scan(&id, &reward_name, &reward_description, &reward_asset, &reward_asset_name)
if err2 != nil {
panic(err.Error())
}
rew := Lottery{
Id: id1,
Lottery: lottery_name,
Description: lottery_description,
Reward : []Rew{Rew{
Id: id,
RewardName: reward_name,
Description: reward_description,
Asset: reward_asset,
AssetName: reward_asset_name,
},
},
}
ctx.JSON(&rew)
}
})
When I use the above function, i am getting JSON format like this
{
"lottery_id": 7,
"lottery_name": "lottery2",
"lottery_description": "lottery for 7",
"rewards": [
{
"reward_id": 9,
"reward_name": "Reward3",
"reward_description": "Reward for lottery 7",
"reward_asset": 20,
"reward_asset_name": "AC"
}
]
}{
"lottery_id": 7,
"lottery_name": "lottery2",
"lottery_description": "lottery for 7",
"rewards": [
{
"reward_id": 10,
"reward_name": "Reward5",
"reward_description": "Reward for lottery 7",
"reward_asset": 15,
"reward_asset_name": "AC"
}
]
}
But I want to get JSON as
{
"lottery_id":7,
"lottery_name":"lottery2"
"lottery_description":"lottery for 7"
"rewards":[
{
"reward_id":9,
"reward_name": "Reward3",
"reward_description": "Reward for lottery 7",
"reward_asset": 20,
"reward_asset_name": "ABC"
},
{ "reward_id":10,
"reward_name": "Reward5",
"reward_description": "Reward for lottery 7",
"reward_asset": 15,
"reward_asset_name": "ABC"
},
{ "reward_id":11,
"reward_name": "Reward7",
"reward_description": "Reward for lottery 7",
"reward_asset": 10,
"reward_asset_name": "ABC"
}
]
}
How can I iterate within struct? Is it possible to have for loop within the struct? or is there any other method where I can get JSON as above?
Please help me.
Something like this:
app.Get("/lottery/{id:int}", func(ctx iris.Context) {
id1 := ctx.Params().GetIntDefault("id", 0)
stmtOut, err := db.Prepare("select lottery_name, lottery_description from lottery_table where id = ?")
if err != nil {
panic(err.Error())
}
defer stmtOut.Close()
lot := Lottery{Id: id1}
err1 := stmtOut.QueryRow(id1).Scan(&lot.Lottery, &lot.Description)
if err != nil {
panic(err1.Error())
}
stmtOut1, err := db.Query("select id, reward_name, reward_description, reward_asset, reward_asset_name from rewards_table where lottery_id = ?", id1)
if err != nil {
panic(err.Error())
}
defer stmtOut1.Close()
for stmtOut1.Next() {
rew := Rew{}
err2 := stmtOut1.Scan(&rew.Id, &rew.RewardName, &rew.Description, &rew.Asset, &rew.AssetName)
if err2 != nil {
panic(err.Error())
}
lot.Reward = append(lot.Reward, rew)
}
ctx.JSON(lot)
})
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.