register user db handler

dao/user.go

@@ -19,7 +19,10 @@ type User struct {
 
 func CreateUser(name, password, email, gender string, age int) uint {
 	user := User{Name: name, Email: email, Password: password, Gender: gender, Age: age}
-	DB.Create(&user)
+	res := DB.Debug().Create(&user)
+	if res.Error != nil {
+		return 0
+	}
 	return user.ID
 }