- make gorm.DB singleton.

globals/gormdb/gormdb.go

@@ -10,6 +10,7 @@ import (
 
 var (
 	dbStr       string
+	singletonDB *gorm.DB
 )
 
 func Init() {
@@ -17,12 +18,17 @@ func Init() {
 	AutoMigrate()
 }
 
+// todo gorm要求用单一的db？如果每次重新调用Open，会导致too many connection错误
 func GetDB() *gorm.DB {
+	if singletonDB == nil {
 		db, err := gorm.Open("mysql", dbStr)
 		if err == nil {
+			singletonDB = db
 			return db
 		}
 		panic(fmt.Sprintf("AutoMigrate failed with error:%v", err))
+	}
+	return singletonDB
 }
 
 func AutoMigrate() {
@@ -38,4 +44,5 @@ func AutoMigrate() {
 	db.AutoMigrate(&model.SkuVendorCategory{}, &model.StoreSkuCategoryMap{}, &model.SkuName{}, &model.Sku{}, &model.SkuNamePlaceBind{}, &model.StoreSkuBind{})
 	db.Set("gorm:table_options", "CHARSET=utf8mb4").AutoMigrate(&model.SkuCategory{})
 	db.AutoMigrate(&model.WeiXins{}, &model.JxBackendUser{})
+	// db.AutoMigrate(&model.DurableTask{}, &model.DurableTaskItem{})
 }