Question

我使用Beego框架在Golang中构建了一个API，我有一个具有多个连接的查询，然后返回一个JSON结果。

我希望有一种方法让我将每一行都转换为一个具有更好键名的结构，IE而不是“Stage__Description”只是“Stage”等等......所以我构建了一个带有键名的ResultMap结构我想，我应该创建一个地图吗？

查询：

type ResultMap struct {
    Id        int
    DateAdded time.Time
    FirstName string
    LastName  string
    Username  string
    Stage     string
    station   string
    status    string
}

//var maps []ResultMap
var maps []orm.Params
num, err := o.QueryTable("test_result_detail").
    Filter("Result__Serial", "121994-0001").
    Values(&maps, "id", "date_added", "stage__description", "station__station", "status__status", "operator__username", "operator__first_name", "operator__last_name" )

JSON RESULT

[
  {
    "DateAdded": "2016-10-20T00:00:00-05:00",
    "Id": 8306105,
    "Operator__FirstName": "Jose",
    "Operator__LastName": "Mendez",
    "Operator__Username": "3362",
    "Stage__Description": "VR1 Test",
    "Station__Station": "TS0653",
    "Status__Status": "PASS"
  },
  {
    "DateAdded": "2016-10-20T00:00:00-05:00",
    "Id": 8306465,
    "Operator__FirstName": "Jose",
    "Operator__LastName": "Mendez",
    "Operator__Username": "3362",
    "Stage__Description": "QA Lab X-Ray Inspection",
    "Station__Station": "LABEQP-0004",
    "Status__Status": "PASS"
  },
  {
    "DateAdded": "2016-10-28T00:00:00-05:00",
    "Id": 8547267,
    "Operator__FirstName": "Jose",
    "Operator__LastName": "Mendez",
    "Operator__Username": "3362",
    "Stage__Description": "Capture Customer SN",
    "Station__Station": "N/A",
    "Status__Status": "PASS"
  },
  {
    "DateAdded": "2016-10-28T00:00:00-05:00",
    "Id": 8547851,
    "Operator__FirstName": "Jose",
    "Operator__LastName": "Mendez",
    "Operator__Username": "3362",
    "Stage__Description": "Final Test",
    "Station__Station": "TS0653",
    "Status__Status": "PASS"
  },
  {
    "DateAdded": "2017-02-14T00:00:00-06:00",
    "Id": 10993864,
    "Operator__FirstName": "Jose",
    "Operator__LastName": "Mendez",
    "Operator__Username": "3362",
    "Stage__Description": "QA Mechanical Final Inspection",
    "Station__Station": "VISUAL INSPECTION",
    "Status__Status": "PASS"
  }
]

Answer 1

您希望在结构上使用json注释，然后使用json.Unmarshal将数据放入结构中。

以下是一个例子：

package main

import (
    "encoding/json"
    "fmt"
)

func main() {
    // The struct you want to store the data in
    // Note the json tags that show which json field corresponds to which struct field
    type Data struct {
        FirstName string `json:"Operator__FirstName"`
        LastName  string `json:"Operator__LastName"`
    }
    // Create a slice of these structs since our json is an array of results
    var structData []Data

    // The json you want to dump into the structs
    jsonData := []byte(`[{"Operator__FirstName": "Bob", "Operator__LastName": "Smith"},{"Operator__FirstName": "John", "Operator__LastName": "Adams"}]`)

    _ = json.Unmarshal(jsonData, &structData)

    fmt.Printf("%+v", structData)
}

这里是Go Playground：https://play.golang.org/p/Z2P7oUVT9i

Answer 2

您也可以使用 MVC 模式。如果你想使用MVC，你需要创建模型包并将模型注册到数据库中。

package models

import (
"time"

"github.com/astaxie/beego/orm"
)

type ResultMap struct {
    Id        int    `orm:"auto"`
    DateAdded time.Time    `orm:"type(datetime)"`
    FirstName string     `orm:"size(255)"`
    LastName  string     `orm:"size(255)"`
    Username  string     `orm:"size(255)"`
    Stage     string     `orm:"size(255)"`
    station   string     `orm:"size(255)"`
    status    string     `orm:"size(255)"`
}

func init() {
    orm.RegisterModel(
        new(ResultMap),
    )
}

然后您可以根据需要在控制器中选择数据作为模型（切片或单个变量）。

func main() {
    var mySlice []models.ResultMap
    _,err := orm.NewOrm().QueryTable("ResultMap").Filter("FirstName","Bob").All(&mySlice)
    if err != nil {
        fmt.Println("Database Error: ",err)
        return
    }

    for _, value := range mySlice {
        fmt.Println("Firstname: ",value.FirstName)
    }
}

您可以检查 model definition 和 ORM usage

Beego / Golang - 查询结构值

2 个答案: