Golang: Gin + Gorm

Gorm 是一個 database 連接的工具，提供 orm 的風格來撰寫資料庫存取。

用法:

先把 SQL Table 中要存取的 Column 先記錄在 struct 中:

type GPS_DATA struct {
 gorm.Model
 GPS       string
 TIME      int64
 DEVICE_ID int
}

int64, 32...etc 不會影響到資料庫存取的型態。
宣告之後 gorm 就會知道你這個 table 有哪些可以存取的 column:

(Example):

package main

import (
 "fmt"
 "net/http"

 "strconv"

 "github.com/gin-gonic/gin"

 "github.com/jinzhu/gorm"

 _ "github.com/jinzhu/gorm/dialects/mysql"

 "time"
)

type GPS_DATA struct {
 gorm.Model
 GPS       string
 TIME      int64
 DEVICE_ID int
}

var beep_state = false

func hello(res http.ResponseWriter, req *http.Request) {

 req.ParseForm()
 fmt.Println(req.URL.Path)
 fmt.Fprint(res, "Hello world")
}

func main() {

 db, err := gorm.Open("mysql", "root:rootroot@/OLDMAN?charset=utf8&parseTime=True&loc=Local")
 if err != nil {
  panic("failed to connect database")
 }
 defer db.Close()

 // Migrate the schema
 db.AutoMigrate(&GPS_DATA{})

 // 建立 Gin 引擎。
 router := gin.Default()

 // 監聽 GET /isBeep 路徑。
 router.GET("/isBeep", func(c *gin.Context) {
  c.String(200, strconv.FormatBool(beep_state))
 })

 router.GET("/setBeep", func(c *gin.Context) {
  beep_state = false
  c.String(200, "OK")
 })

 router.GET("/questBeep", func(c *gin.Context) {
  beep_state = true
  c.String(200, "setBeepRequestPendding")
 })

 //The line after this comment is gps samulation feature.
 router.GET("/addDevice")

 router.GET("/addGPSData", func(c *gin.Context) {
  la := c.Param("la")
  lo := c.Param("lo")
  device_id := c.Param("device_id")

  deviceIdInteger, _ := strconv.Atoi(device_id)

  fmt.Printf(deviceIdInteger)

  db.Create(&GPS_DATA{GPS: la + lo, TIME: time.Now().Unix(), DEVICE_ID: deviceIdInteger})

  c.String(200, "Received data")
 })

 // 在 :8080 啟動伺服器。
 router.Run(":8080")
}

Reference:
http://jinzhu.me/gorm/crud.html
http://jinzhu.me/gorm/database.html