uniqueidentifier

问题 I am looking for a way to increment a uniqueidentifier by 1 in TSQL. For example, if the id is A6BC60AD-A4D9-46F4-A7D3-98B2A7237A9E, I'd like to be able to select A6BC60AD-A4D9-46F4-A7D3-98B2A7237A9F. @rein It's for a data import. We have an intermediate table with IDs that we're generating records from, and we join on those IDs later in the import. Unfortunately, now some of those records generate a couple of records in the next table, so we need a new id that is reproducible. 回答1: The way

问题 Does there exist any unique identifier for files in a Git Repository? This unique identifier must be the same after some commits (modifying files), or after renaming and moving file(s). Does such a thing exist? I tried git ls-files --debug but I didn't find a unique identifier with the characteristics listed above. 回答1: The only unique identifier for a file ("blob") within a git repo is its SHA-1, but that is a checksum of the file's contents (plus the fact of it being a file/blob). It

问题 im working on a project where in i need to populate some files from the server and show them in a webrowser to the user. Where user would be allowed to do basic CRUD operation on the file The problem is that i cannot assign the name of the file/folder as unique id which i need in case a user deletes/renames a file i should be able to identify the file later. My question is that is there anything unique about any file/folder in NTFS that is unique about them and that can be used? and how that

问题 I've been wondering what's the correct practice for generating unique ids? The thing is in my web app I'll have a plugin system, when a user registers a plugin I want to generate a unique serial ID for it. I've been thinking about storing all numbers in a DB or a file on the server, generating a random number and checking whether it already exists in the DB/file, but that doesn't seem that good. Are there other ways to do it? Would using the UUID be the preferred way to go? 回答1: If the ids

问题 Here my problem statement: I have a set of strings that match a regular expression. let's say it matches [A-Z][0-9]{3} (i.e. 1 letter and 3 digits). I can have any number of strings between 1 and 30. For example I could have: {A123} {A123, B456} {Z789, D752, E147, ..., Q665} ... I need to generate an integer (actually I can use 256 bits) that would be unique for any set of strings regardless of the number of elements (although the number of elements could be used to generate the integer) What

问题 I have a Rails 4 app using Devise (the most recent) and am trying to create a random token for each user (like the ID, but longer, etc.) Using this answer I was able to come up with the follow code: # app/models/model_name.rb class ModelName < ActiveRecord::Base include Tokenable end # app/models/concerns/tokenable.rb module Tokenable extend ActiveSupport::Concern included do before_create :generate_token end protected def generate_token self.token = loop do random_token = SecureRandom

问题 I want to know if it's possible to do the following using an android device. The user is on his android device browsing a site using the native browser. When the user clicks on an particular link or image; is it possible to get a unique ID from the phone? or write a file to the sd card on the phone? or any means of identifying the device later. Later when I run a particular application I want to be able to access the information which was stored when the user browsing the website. I know

问题 I'm implementing an way to unique identify the device. The architect send me the following specs: devices with Wifi + 3G: IMEI Code devices Wifi only - MacAddress Both needs also the Manufacturer + Model for complete the id. My questions are: How do I get the IMEI from the device? How can I get the Manufacturer and Model from the device? (I see theres some constants on Build class for it, but don't know where to use them) Theres devices with 3G only? How can I know if the device is wifi only,

问题 I need to store in SQL Server a list of items uniquely identified by a hash. In C# I compute my hash as MD5 hash of concatenation of the item ids ( Guid ). Currently, my hash has datatype byte[] in C# , and binary(16) in SQL Server. Here's the DDL : CREATE TABLE [dbo].[ItemSet]( [GUID] [uniqueidentifier] NOT NULL, [HashCode] [binary](16) NOT NULL, [Item1GUID] [uniqueidentifier] NOT NULL, [Item2GUID] [uniqueidentifier] NOT NULL, ... [UtcModified] [datetime] NULL, CONSTRAINT [ItemSet_PK]

问题 I have the following object: @Id @GeneratedValue private long id; @Column(name = "uniqueId", unique=true) private String uniqueId; is it possible to get an object from the DB that has object.uniqueId == "some_unique_id"?? thanks. 回答1: String hql = "select foo from Foo foo where foo.uniqueId = :uniqueId"; return (Foo) session.createQuery(hql) .setString("uniqueId", theUniqueId) .uniqueResult(); 来源： https://stackoverflow.com/questions/16119850/hibernate-get-object-by-non-id-unique-identifier