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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...
Client-server synchronization pattern / algorithm?
...ique when items could be created on different devices. I didn't know about UUIDs when I started this, so I used auto-incrementing IDs and wrote some convoluted code that runs on the central server to check new IDs uploaded from devices, change them to a unique ID if there's a conflict, and tell the ...
How to manage local vs production settings in Django?
...ose to (successfully!) use your solution, with a slight difference: I used uuid.getnode() to find uuid of my system. So I'm testing if uuid.getnode() == 12345678901 (actually a different number) instead of the os.environ test you used. I couldn't find documenation to convince me that os.environ['COM...
Possibility of duplicate Mongo ObjectId's being generated in two different collections?
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ObjectIds are generated client-side in a manner similar to UUID but with some nicer properties for storage in a database such as roughly increasing order and encoding their creation time for free. The key thing for your use case is that they are designed to guarantee uniqueness to a ...