uniqueidentifier

问题 I am investigating ways to take a directory (folder) and derive some form of unique numerical identifier. I have investigated "string to hash" methods, however, the Pigeon Hole Principle means that one can never derive a truely unique number for every single string. String to unique hash is no good. I have recently been investigating other means of achieving my goal and thus have the following question to ask: Directory time stamps - how 'unique' are they? To what resolution are the time

问题 I have a requirement to include NFC Card reader to read associate ID to authenticate the user for a web app displayed in a touch screen. Is it possible to use SCM NFC reader module for a web-based app. Is there any plugin that can we included in the client or server side for this purpose ? Thanks in advance. 回答1: The Web NFC API (maintained by the NFC Working Group is currently in draft status. This API is intended to provide access to NFC functionality for HTML5. BUT In its current version

问题 I want to get from any Unix-like system (if this is possible) a unique id that will be persistent every time my application runs in the same machine. If it is possible, I want to get the same id from Linux or FreeBSD or Solaris, etc... I don't want to generate a new id for each machine, but get an already existent id, and I prefer this id to come from the operating system and I don't prefer to use something like the MAC address. If there is no other option available, I can use MAC in

问题 I want to get from any Unix-like system (if this is possible) a unique id that will be persistent every time my application runs in the same machine. If it is possible, I want to get the same id from Linux or FreeBSD or Solaris, etc... I don't want to generate a new id for each machine, but get an already existent id, and I prefer this id to come from the operating system and I don't prefer to use something like the MAC address. If there is no other option available, I can use MAC in

问题 Can anyone tell me if there is an equivalent of SCOPE_IDENTITY() when using GUIDs as a primary key in SQL Server? I don't want to create the GUID first and save as a variable as we're using sequential GUIDs as our primary keys. Any idea on what the best way to retrieve the last inserted GUID primary key? 回答1: You can get the GUID back by using OUTPUT. This works when you're inserting multiple records also. CREATE TABLE dbo.GuidPk ( ColGuid uniqueidentifier NOT NULL DEFAULT NewSequentialID(),

问题 Can anyone tell me if there is an equivalent of SCOPE_IDENTITY() when using GUIDs as a primary key in SQL Server? I don't want to create the GUID first and save as a variable as we're using sequential GUIDs as our primary keys. Any idea on what the best way to retrieve the last inserted GUID primary key? 回答1: You can get the GUID back by using OUTPUT. This works when you're inserting multiple records also. CREATE TABLE dbo.GuidPk ( ColGuid uniqueidentifier NOT NULL DEFAULT NewSequentialID(),

问题 Can someone tell me if the code I have been using is the proper way to get the unique id? I am suspecting i may have dupes out there and this could be causing issues on an administrative level in my company... final TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE); String UDID = tm.getDeviceId(); 回答1: It is the proper way to call getDeviceId() . That may not be a unique identifier, since not all devices are phones and some phones have bugs. See this

问题 Can someone tell me if the code I have been using is the proper way to get the unique id? I am suspecting i may have dupes out there and this could be causing issues on an administrative level in my company... final TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE); String UDID = tm.getDeviceId(); 回答1: It is the proper way to call getDeviceId() . That may not be a unique identifier, since not all devices are phones and some phones have bugs. See this

问题 I'm trying to verify registration via email with sending of unique identifier link to user. I use it from remote server. Server, username, password, database values are correct, works fine with other .php -s, only difference verify.php has connection included, instead require 'connection.php'; , but I'm not sure if connection produces following failure. Sends: $message = "<p>Hello, dear $user</p><a href='https://mypage.info/php/reg/verify.php?vkey=$vkey'>Confirm Account</a>"; and receives on

问题 I'm trying to verify registration via email with sending of unique identifier link to user. I use it from remote server. Server, username, password, database values are correct, works fine with other .php -s, only difference verify.php has connection included, instead require 'connection.php'; , but I'm not sure if connection produces following failure. Sends: $message = "<p>Hello, dear $user</p><a href='https://mypage.info/php/reg/verify.php?vkey=$vkey'>Confirm Account</a>"; and receives on