重要的提示
它只是Revel原始示例的GORP的替代品。它带有一些起源陷阱。这个答案可以用作原始答案的直接替代品。但这并不能解决陷阱。
请看一下这个 unswer 和@MaxGabriel解决陷阱的答案的评论。
我建议使用@MaxGabriel 的解决方案来保护您的应用程序免受某些缓慢* DDoS 攻击。并减少(在某些情况下)数据库压力。
原始答案
@rauyran rights,你必须调用InitDB
内部init
函数(进入controllers
包)。
这里的完整示例(太多):
树
/app
/controllers
app.go
gorm.go
init.go
/models
user.go
[...]
用户.go
// models/user.go
package models
import "time" // if you need/want
type User struct { // example user fields
Id int64
Name string
EncryptedPassword []byte
Password string `sql:"-"`
CreatedAt time.Time
UpdatedAt time.Time
DeletedAt time.Time // for soft delete
}
gorm.go
//controllers/gorm.go
package controllers
import (
"github.com/jinzhu/gorm"
_ "github.com/lib/pq" // my example for postgres
// short name for revel
r "github.com/revel/revel"
// YOUR APP NAME
"yourappname/app/models"
"database/sql"
)
// type: revel controller with `*gorm.DB`
// c.Txn will keep `Gdb *gorm.DB`
type GormController struct {
*r.Controller
Txn *gorm.DB
}
// it can be used for jobs
var Gdb *gorm.DB
// init db
func InitDB() {
var err error
// open db
Gdb, err = gorm.Open("postgres", "user=uname dbname=udbname sslmode=disable password=supersecret")
if err != nil {
r.ERROR.Println("FATAL", err)
panic( err )
}
Gdb.AutoMigrate(&models.User{})
// unique index if need
//Gdb.Model(&models.User{}).AddUniqueIndex("idx_user_name", "name")
}
// transactions
// This method fills the c.Txn before each transaction
func (c *GormController) Begin() r.Result {
txn := Gdb.Begin()
if txn.Error != nil {
panic(txn.Error)
}
c.Txn = txn
return nil
}
// This method clears the c.Txn after each transaction
func (c *GormController) Commit() r.Result {
if c.Txn == nil {
return nil
}
c.Txn.Commit()
if err := c.Txn.Error; err != nil && err != sql.ErrTxDone {
panic(err)
}
c.Txn = nil
return nil
}
// This method clears the c.Txn after each transaction, too
func (c *GormController) Rollback() r.Result {
if c.Txn == nil {
return nil
}
c.Txn.Rollback()
if err := c.Txn.Error; err != nil && err != sql.ErrTxDone {
panic(err)
}
c.Txn = nil
return nil
}
应用程序.go
package controllers
import(
"github.com/revel/revel"
"yourappname/app/models"
)
type App struct {
GormController
}
func (c App) Index() revel.Result {
user := models.User{Name: "Jinzhup"}
c.Txn.NewRecord(user)
c.Txn.Create(&user)
return c.RenderJSON(user)
}
初始化.go
package controllers
import "github.com/revel/revel"
func init() {
revel.OnAppStart(InitDB) // invoke InitDB function before
revel.InterceptMethod((*GormController).Begin, revel.BEFORE)
revel.InterceptMethod((*GormController).Commit, revel.AFTER)
revel.InterceptMethod((*GormController).Rollback, revel.FINALLY)
}
如您所见,这就像为 GORM 修改的 Revel 的 Booking。
对我来说很好。结果:
{
"Id": 5,
"Name": "Jinzhup",
"EncryptedPassword": null,
"Password": "",
"CreatedAt": "2014-09-22T17:55:14.828661062+04:00",
"UpdatedAt": "2014-09-22T17:55:14.828661062+04:00",
"DeletedAt": "0001-01-01T00:00:00Z"
}