Conversion String to UUID in Postgres and Java
In PostgresSQL’s SQL grammar Using concat(UUID,”) returns a text result. Using uuid(text) returns a UUID result.
uuid
Use npm uuid in reactjs
Try this: import React from “react”; import ReactDOM from “react-dom”; import uuid from “uuid”; function App() { return ( <div className=”App”> <h1>{uuid.v4()}</h1> </div> ); } const rootElement = document.getElementById(“root”); ReactDOM.render(<App />, rootElement); This is a working example: https://codesandbox.io/s/0pr5vz48kv
Get UUID without iTunes
Connect your iPhone to the Mac(mine is OS10.8). Launch System Information under Utilies the UUID of your iPhone is list under USB/iPhone/Serial Number
Android: Use UUID as primary key in SQLite
Is it a bad idea to use a UUID (String / Varchar) as primary key in a android sqlite database table instead of an integer that would be auto incremented? The only for-certain problem that I can think of is that you will not be able to use CursorAdapter and its subclasses for displaying the … Read more
MySQL set default id UUID
MySQL 5.7, 8.0.12 and older MySQL as of 5.7 or 8.0.12 does not support using a function or expression as the default value of a column. The DEFAULT value clause in a data type specification indicates a default value for a column. With one exception, the default value must be a constant; it cannot be … Read more
Persisting UUID in PostgreSQL using JPA
The PostgreSQL JDBC driver has chosen an unfortunately way to represent non-JDBC-standard type codes. They simply map all of them to Types.OTHER. Long story short, you need to enable a special Hibernate type mapping for handling UUID mappings (to columns of the postgres-specific uuid datatype): @Id @Column(name = “customer_id”) @org.hibernate.annotations.Type(type=”org.hibernate.type.PostgresUUIDType”) private UUID id; or more … Read more
Convert boost::uuid to char*
Just in case, there is also boost::uuids::to_string, that works as follows: #include <boost/uuid/uuid.hpp> #include <boost/uuid/uuid_io.hpp> boost::uuids::uuid a = …; const std::string tmp = boost::uuids::to_string(a); const char* value = tmp.c_str();
GUID / UUID type in typescript
You could create a wrapper around a string and pass that around: class GUID { private str: string; constructor(str?: string) { this.str = str || GUID.getNewGUIDString(); } toString() { return this.str; } private static getNewGUIDString() { // your favourite guid generation function could go here // ex: http://stackoverflow.com/a/8809472/188246 let d = new Date().getTime(); if (window.performance … Read more
Type of Character generated by UUID
tl;dr You asked: Does java.util.UUID generates special characters? No. A UUID is actually a 128-bit value, not text. A UUID’s textual representation is canonically a string of hex digits (0-9, a-f, A-F) plus hyphens. You asked: What are the type of each character (eg- Uppercase, lower case, digits) generated by UUID. As required by the … Read more
How to generate UUID with angular 2?
It’s downloaded as a part of Angular’s dependency, use it like: import { v4 as uuid } from ‘uuid’; @Component(..) export class AppComponent { console.log(‘new uid: ‘, uuid()); }