uuid

问题 I am developing an application which uses Bluetooth to connect to a device and send/receive data. I am doing all of my testing with a Nexus One phone. I have never been able to establish a SPP (serial port) connection from my phone to any device. However, I have been able to connect from a device (my laptop) to my phone using a Mac equivalent of PuTTY (The only exception to this is the "Bluetooth File Transfer" app from the Marketplace seems to work, but I don't think that uses RFCOM/SPP...).

问题 I would like to use a GIN index on uuid[] (to have efficient membership tests for arrays of uuids). However when I try it PostgreSQL gives me an error: mydb=> CREATE TABLE foo (val uuid[]); CREATE TABLE mydb=> CREATE INDEX foo_idx ON foo USING GIN(val); ERROR: data type uuid[] has no default operator class for access method "gin" HINT: You must specify an operator class for the index or define a default operator class for the data type. How can I add the necessary operator class so that it

问题 I would like to use a GIN index on uuid[] (to have efficient membership tests for arrays of uuids). However when I try it PostgreSQL gives me an error: mydb=> CREATE TABLE foo (val uuid[]); CREATE TABLE mydb=> CREATE INDEX foo_idx ON foo USING GIN(val); ERROR: data type uuid[] has no default operator class for access method "gin" HINT: You must specify an operator class for the index or define a default operator class for the data type. How can I add the necessary operator class so that it

问题 I'm using Angular 2 for a signup form: first name, last name, email and password. After submit, the data is being stored via API call in a database (nodeJs and mongo) and generates a JWT Token which is sent back to the client. Now I should add/generate an UUID (Universal Unique Identifier). As I never have done this kind of feature before, I need an approach and idea/solution how to achieve this... would the JWT Token be a kind of alternative to UUID? If yes, this would be enough. Otherwise I

问题 I'm using Angular 2 for a signup form: first name, last name, email and password. After submit, the data is being stored via API call in a database (nodeJs and mongo) and generates a JWT Token which is sent back to the client. Now I should add/generate an UUID (Universal Unique Identifier). As I never have done this kind of feature before, I need an approach and idea/solution how to achieve this... would the JWT Token be a kind of alternative to UUID? If yes, this would be enough. Otherwise I

问题 I want generate unique ID just like auto increment in java . So previously i used current nano seconds but i end up with clash since two data comes with in same nano seconds .. Does UUID solves the above problem ? Note :: In my project i can even get 10000 rows of records for each and every minute and I will dump those records along with UIDS in to table .And there may be a situation where i would stop my product and restart it after some time ....So during that situation how could UUID class

问题 Note: This is a question-with-answer in order to document a technique that others might find useful, and in order to perhaps become aware of others’ even better solutions. Do feel free to add critique or questions as comments. Also do feel free to add additional answers. :) Visual C++ has always had a language extension __uuidof( classname ) that can retrieve an UUID , a 128 bit Universally Unique Identifier , provided that the UUID’s been associated with the class via __declspec , which also

问题 I have this function: function getProduct(id: string){ //return some product } where id is actually GUID. Typescript doesn't have guid type. Is it possible create type GUID manually? function getProduct(id: GUID){ //return some product } so if instead 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx' will be some 'notGuidbutJustString' then I will see typescript compilation error. Update: as David Sherret said: there is no way to ensure a string value based on regex or some other function at compile

问题 How can I generate GUIDs and UUIDs in R? I would like to be able to generate GUIDs based on the hardware etc. of the machine running the rsession. As a fallback, however, I would be happy to create UUIDs that comply with rfc4122. Is there a package that can create GUIDs? Otherwise, does someone have some RFC4122 compatible UUID code lying about? 回答1: The optimal choice for this now is the uuid package. It consists of one function ( UUIDgenerate ) that doesn't rely on R's internal random

问题 Is there away to get the build UUID, the one that you can check in the dSYM generated file and the image base address in iOS. Not so good when it comes to low level stuff, anyone can enlighten? 回答1: Here is a solution similar to Kerni's answer but which works for any platform (iOS device + simulator and OS X) and any architecture (32-bit + 64-bit). It also returns a NSUUID instead of a NSString . #import <mach-o/dyld.h> #import <mach-o/loader.h> static NSUUID *ExecutableUUID(void) { const