unique id number

Original: Http://mp.weixin.qq.com/s/cqIK5Bv1U0mT97C7EOxmnA distributed unique ID minimalist tutorialOne, the signature All business systems have the need to generate IDs, such as order IDs, product IDs, article IDs, and so on. This ID will be the

There are a number of scenarios and requirements that you need to use a unique identifier for your mobile device.In Android, there are several ways to get such an ID.1. The IMEI: only valid for Android phones: 12

OverviewSometimes the user device needs to be identified, so you want to get a stable and reliable and unique identification code. Although such device identifiers are available in the Android system, stability and uniqueness are not ideal due to

This article mainly describes how to generate globally unique IDs in a distributed system. Preface Simply generating global IDs is not a challenge, generating a global unique ID to meet the following requirements: Ensure that the generated ID is

Key differs from primary keyKey is usually the index synonym. If the keyword attribute primary key is given in the column definition, then primary key can also be specified as key only. The purpose of this is to be compatible with other database

How PHP generates a unique numeric ID, note that it is numeric, do not string the Reply content: How PHP generates a unique numeric ID, note that it is numeric, do not string the Landlord, you are a big problem. Twitter,weibo and so on have

Generally, we can see that the terms "Index" and "key" are used for exchange, but they are actually different. An index is a physical structure stored in a database. A key is purely a logical concept. The key represents the integrity constraints

Unique identification code This is useful in Web applications, such as checking for duplicate registrations.Import Android.provider.Settings.Secure;Private String android_id = secure.getstring (GetContext (). Getcontentresolver (), secure.android_id)

Source: As long as the microcontroller has a true unique ID, you can make encryption indestructibleHttp://www.amobbs.com/thread-5518980-1-1.htmlFirst ring:ID-->F1 (ID)---"IDX,The ID is converted to an integer idx by a custom algorithm F1, F1 is an

Http://www.cnblogs.com/lsx1993/p/4663125.html "Database primary key scheme in distributed environment" [Http://www.2cto.com/database/201309/243195.html] Using a self-added primary key ID is certainly the best fit when using only a single database.