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How to create GUID / UUID?
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UUIDs (Universally Unique IDentifier), also known as GUIDs (Globally Unique IDentifier), according to RFC 4122, are identifiers designed to provide certain uniqueness guarantees.
While it is possible to implement an RFC-comp...
How can I generate a unique ID in Python? [duplicate]
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Perhaps uuid.uuid4() might do the job. See uuid for more information.
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BLE_AD_TYPE_16SRV_PART = 0x02, /* 设备16bit部分uuid */
BLE_AD_TYPE_16SRV_CMPL = 0x03, /* 设备16bit完整uuid */
BLE_AD_TYPE_32SRV_PART = 0x04, /* 设备32bit部分uuid */
BLE_AD_TYPE_32SRV_CMPL = 0x05, /*...
UIDevice uniqueIdentifier deprecated - What to do now?
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A UUID created by CFUUIDCreate is unique if a user uninstalls and re-installs the app: you will get a new one each time.
But you might want it to be not unique, i. e. it should stay the same when the user uninstalls and re-ins...
UUID max character length
We are using UUID as primary key for out oracle DB, and trying to determine an appropriate max character length for the VARCHAR. Apparently this is 36 characters but we have noticed UUID'S generated which are longer than this - up to 60 characters in length.
Does anyone know a suitable max char leng...
Generate a random alphanumeric string in Cocoa
...yourself to hex characters only, then the simplest option is to generate a UUID:
NSString *uuid = [NSUUID UUID].UUIDString;
Example output: 16E3DF0B-87B3-4162-A1A1-E03DB2F59654.
If you want a smaller random string then you can grab just the first 8 characters.
It's a version 4 UUID which means ...
Likelihood of collision using most significant bits of a UUID in Java
If I'm using Long uuid = UUID.randomUUID().getMostSignificantBits() how likely is it to get a collision. It cuts off the least significant bits, so there is a possibility that you run into a collision, right?
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How to generate a random alpha-numeric string?
...less likely than undetected errors from cosmic rays, etc.
Comparison with UUIDs
According to their specification, UUIDs are not designed to be unpredictable, and should not be used as session identifiers.
UUIDs in their standard format take a lot of space: 36 characters for only 122 bits of entro...
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...; = 0x02, /* 设备16bit部分uuid */
BLE_AD_TYPE_16SRV_CMPL = 0x03, /* 设备16bit完整uuid */
BLE_AD_TYPE_32SRV_PART  ...
Is it safe to assume a GUID will always be unique?
..., for every cell in every person who has ever lived, there are 36 trillion UUIDs. You have about 10^14 cells in your body, and 106.5 billion people have ever lived. Or, 2.385 * 10^23 UUIDs for every cent in the US public debt.
– new123456
Aug 11 '11 at 1:47
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