Random String Key Generator
This little library makes it easy to generate short, unique, YouTube-like IDs that you can use instead of UUID in your application.
Using shorter (but still unique) ids will have positive inpact on database performance (especially MySQL, which don't handle UUID well).
This library consists of both generator itself, as well as Doctrine integration.
GUID (or UUID) is an acronym for 'Globally Unique Identifier' (or 'Universally Unique Identifier'). It is a 128-bit integer number used to identify resources. The term GUID is generally used by developers working with Microsoft technologies, while UUID is used everywhere else. UUID, Universal Unique Identifier, is a python library which helps in generating random objects of 128 bits as ids. It provides the uniqueness as it generates ids on the basis of time, Computer hardware (MAC etc.). Advantages of UUID: Can be used as general utility to generate unique random id. Free download microsoft office 2010 key generator. Jul 06, 2015 Use the reflect UDF to generate UUIDs. Reflect(“java.util.UUID”, “randomUUID”) e.g. CREATE TABLE temptbl AS SELECT reflect(‘java.util.UUID’,’randomUUIDR. Hibernate provides the list of built in generator classes to generate unique identifiers, all the generator classes implements the org.hibernate.id.IdentifierGenerator interface, and if your needs of unique identifiers is not solved by using built in generator classes, then you can create your own generator classes by implementing org.hibernate.id.IdentifierGenerator interface. Since a UUID has a finite size there is no way for it to be unique across all of space and time. If you need a UUID that is guaranteed to be unique within any reasonable use case you can use Log4j 2's Uuid.getTimeBasedUuid. It is guaranteed to be unique for about 8,900 years so long as you generate less than 10,000 UUIDs per millisecond.
It allows you to customize length of default generator, as well as to write generators of your own.
Will it REALLY generate short unique ids?
Let's look at how many unique values can standard 8 characters long sequence have:
In the end even UUID might not be unique, it depends on the way you see it. In the end, unless you're using really short ids, it's very close to impossible to get two duplicate strings.I ran multiple tests of generating large amounts of ids (tens of millions) in very short time and couldn't make it to get two duplicate ids.
If you are really afraid of duplicate values, you can extend the key length, but in general this is not neccesary.
1. Installation
Use Composer to install it: Visual studio 2012 ultimate product key generator and activator.
2. Usage
Generating ID manually
Generating ID automatically in Doctrine
Just set up generator annotations (
GeneratedValue(strategy='CUSTOM')
and CustomIdGenerator(..)
) on top of field declaration.Changing default settings
This library comes with single generator, that returns 8 characters long strings.
Changing default key length and other default settings
Getting instance of your own generator
I want to change default generator config for Doctrine and Symfony. How can I do that?
Far cry 2 key generator. Unfortunately, Doctrine metadata factory restricts from passing any parameters or container parameters/services to ID Generators. Your only option here is to set GeneratorFactory defaults before app initialization. In case of Symfony, the place you're looking for is Kernel class.
3. Testing
Candidate Key
Just run
in this repository, to run the test suite.
4. Contribution
Have idea on how to develop it? Found a bug and want to fix it? Pull Requests and Issues are welcome :)
- Java.util Package Classes
- Java.util Package Extras
- Java.util Useful Resources
- Selected Reading
Description
The randomUUID() method is used to retrieve a type 4 (pseudo randomly generated) UUID. The UUID is generated using a cryptographically strong pseudo random number generator.
Declaration
Following is the declaration for java.util.UUID.randomUUID() method.
Parameters
NA
Return Value
The method call returns a randomly generated UUID.
Exception
NA
Example
Win 8.1 activation key generator 2013. The following example shows the usage of java.util.UUID.randomUUID()
Foreign Key
Let us compile and run the above program, this will produce the following result.
Primary Key
java_util_uuid.htm