[go] String slicing and string in and out database conversion

need

1. Store request data in database
2. Return with data read from database
3. When deserialization is not used when exporting the library

请求结构体

type NoticegroupsCreateReq struct {
	Name      string   `json:"name" binding:"required"`
	UserIds   []string `json:"user_ids"  binding:"required"`
}

数据库类型

name	type
name	varchar
user_ids	longtext

返回结构体

type NoticegroupsCreateReq struct {
	Name      string   `json:"name" binding:"required"`
	UserIds   []string `json:"user_ids"  binding:"required"`
}

code

Warehouse

// []string -> string   []userIds -> ids

// 此时输出一下将要入口的数据，待转化数据
fmt.Println(req.UserIds)
// [31 62 32 44 33]

userIds, err := json.Marshal(req.UserIds)
ids := string(userIds)

fmt.Println(string(userIds))
// ["31","62","32","44","33"]

out of warehouse

// string -> []string  noticegroup.UserIds -> []userId

// 此时输出一下从数据库直接读到的数据，待转化数据
fmt.Println("s:",noticegroup.UserIds)
// s ="[\"31\"", "\"62\"","\"32\"","\"44\"","\"33\"]"

// 去掉字符串两边的方括号
noticegroup.UserIds = strings.Trim(noticegroup.UserIds, "[]")
// 按逗号拆分字符串
userId := strings.Split(noticegroup.UserIds, ",")
// 去掉每个字符串两边的引号和空格
for i := 0; i < len(userId); i++ {
    
    
	userId[i] = strings.Trim(userId[i], "\" ")
}

fmt.Println(userId)
// [31 62 32 44 33]

历程

ask	Convert	storage	return
[31 62]	[“31”,“62”]	"[“31"”, ““62"”]”	[31 62]