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iOS Ad Hoc 和 App Store 区别 - App应用开发 - 清泛IT社区，为创新赋能！
前者：本地有限设备测试，要提前添加设备uuid，有效期7天。生成ipa，开发者权限打开的手机才能扫描下载安装。
后者：直接发布AppStore审核，无需添加设备，需要特殊密码。不生产ipa，直接走发布审核流程。（编译窗中的Short ...
Distributed sequence number generation?
...e unique IDs on the clients themselves, using an approach derived from how UUIDs and Snowflake's IDs are made. There are multiple options, but something along the lines of:
The most significant 40 or so bits: A timestamp; the generation time of the ID. (We're using the most significant bits for th...
PHP: How to generate a random, unique, alphanumeric string for use in a secret link?
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You can use UUID(Universally Unique Identifier), it can be used for any purpose, from user authentication string to payment transaction id.
A UUID is a 16-octet (128-bit) number. In its canonical form, a UUID is represented by 32 hexade...
Generating random strings with T-SQL
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Do not use RIGHT/SUBSTRING to truncate an UUID since it will be neither unique nor random due to the way UUIDs are generated!
– ooxi
Apr 11 '14 at 7:42
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How to generate a new Guid in stored procedure?
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In MySQL it is UUID().
so the query would be:
insert into cars
(id, Make, Model)
values(UUID(), "Ford", "Mustang")
if you want to reuse the uuid you can do it like this:
set @id=UUID();
insert into cars
(id, Make, Model)
values(@id, "Fo...
使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE) · App Inventor 2 中文网
...组相似特征的组合，其中每个服务通过通用唯一标识符 (UUID) 来区分其他服务。 与服务类似，特征也通过其自己唯一的数字 UUID [7] 来区分自己。 图 3 显示了服务和特征的层次性质，其中特征位于 GATT 事务的最低级别。 客户端依...
Arduino101（Genuino 101）&App Inventor – RGB LED控制 - 创客硬件开...
... BLE AnalogRead Service
// BLE LED Switch Characteristic - custom 128-bit UUID, read and writable by central
BLEUnsignedIntCharacteristic LEDStatus("19B10011-E8F2-537E-4F6C-D104768A1214", BLERead | BLEWrite );
int incom = 0;
int r, g, b ;
void setup() {
Serial.beg...
How to handle many-to-many relationships in a RESTful API?
...going to make that easier.
Relationship IDs probably ought to be based on UUIDs or something equally long and random, irrespective of whatever type of IDs you use for teams and players. That will let you use the same UUID as the ID component for each end of the relationship without worrying about c...
Rails: How can I set default values in ActiveRecord?
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You can also pass a lambda to the default parameter. Example:
attribute :uuid, :string, default: -> { SecureRandom.uuid }
The second argument is the type and it can also be a custom type class instance, for example:
attribute :uuid, UuidType.new, default: -> { SecureRandom.uuid }
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do N times (declarative syntax)
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For piece of mind I ran a uuid function 50k times to make sure it never duplicated a uuid. So I profiled the top loop vs the bottom just for kicks, just running in the middle of a normal page load using chrome dev tools if im not being dumb I think it...