lovefield | relational database for web apps

 by   google JavaScript Version: 2.1.12 License: Apache-2.0

kandi X-RAY | lovefield Summary

lovefield is a JavaScript library. lovefield has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can install using 'npm i lovefield-node' or download it from GitHub, npm.
Lovefield is a relational database written in pure JavaScript. It provides SQL-like syntax and works cross-browser (currently supporting Chrome 37+, Firefox 31+, IE 11+, Edge, and Safari 10+). Please visit our public forum for general Q&A, feedback, and discussions. Lovefield is Day 98 of 100 days of Google Dev. This is a quick 7-minute video filmed in August 2015. Live 30min overview presentation at JS.LA (February 2015): Watch on YouTube or Vimeo.
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                        summary
                        lovefield has a medium active ecosystem.
                        summary
                        It has 6615 star(s) with 403 fork(s). There are 196 watchers for this library.
                        summary
                        It had no major release in the last 12 months.
                        summary
                        There are 42 open issues and 185 have been closed. On average issues are closed in 16 days. There are 13 open pull requests and 0 closed requests.
                        summary
                        It has a neutral sentiment in the developer community.
                        summary
                        The latest version of lovefield is 2.1.12
                        lovefield Support
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                                  kandi-Quality Quality

                                    summary
                                    lovefield has 0 bugs and 0 code smells.
                                    lovefield Quality
                                      Best in #JavaScript
                                        Average in #JavaScript
                                        lovefield Quality
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                                            Average in #JavaScript

                                              kandi-Security Security

                                                summary
                                                lovefield has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
                                                summary
                                                lovefield code analysis shows 0 unresolved vulnerabilities.
                                                summary
                                                There are 0 security hotspots that need review.
                                                lovefield Security
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                                                    Average in #JavaScript
                                                    lovefield Security
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                                                          kandi-License License

                                                            summary
                                                            lovefield is licensed under the Apache-2.0 License. This license is Permissive.
                                                            summary
                                                            Permissive licenses have the least restrictions, and you can use them in most projects.
                                                            lovefield License
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                                                                        summary
                                                                        lovefield releases are not available. You will need to build from source code and install.
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                                                                        Deployable package is available in npm.
                                                                        summary
                                                                        lovefield saves you 688 person hours of effort in developing the same functionality from scratch.
                                                                        summary
                                                                        It has 1593 lines of code, 0 functions and 421 files.
                                                                        summary
                                                                        It has low code complexity. Code complexity directly impacts maintainability of the code.
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                                                                                  lovefield Key Features

                                                                                  Lovefield is a relational database for web apps. Written in JavaScript, works cross-browser. Provides SQL-like APIs that are fast, safe, and easy to use.

                                                                                  lovefield Examples and Code Snippets

                                                                                  No Code Snippets are available at this moment for lovefield.
                                                                                  Community Discussions

                                                                                  Trending Discussions on lovefield

                                                                                  The state of Google Lovefield
                                                                                  chevron right
                                                                                  What does \\n means and how to remove it?
                                                                                  chevron right
                                                                                  How to configure Angular-CLI-generated project to include a SharedWorker
                                                                                  chevron right
                                                                                  List last messages of chats
                                                                                  chevron right
                                                                                  Is there any client side Db library that supports partial text search?
                                                                                  chevron right

                                                                                  QUESTION

                                                                                  The state of Google Lovefield
                                                                                  Asked 2021-Mar-13 at 18:18

                                                                                  Google Lovefield is a JS relational database layer on top of IndexedDB: https://github.com/google/lovefield

                                                                                  In their FAQ, it is said to be (or have been) in use by gmail.

                                                                                  It seems to no longer be developed and hardly maintained, and while the docs are not bad, I couldn't find a lot of information / tutorials for it.

                                                                                  I also didn't find information on whether it has been abandoned, or if it is continued or was transformed into another library.

                                                                                  If anyone has concrete information about the state of this library or derived products then I'll be happy to know.

                                                                                  ANSWER

                                                                                  Answered 2021-Mar-13 at 18:18

                                                                                  According to comments from GitHub, it is in "long-term maintenance mode".
                                                                                  This means basically abandoned, but good enough for production for now. https://github.com/google/lovefield/issues/266#issuecomment-678883485
                                                                                  https://github.com/google/lovefield/issues/270#issuecomment-708864795

                                                                                  Source https://stackoverflow.com/questions/66616883

                                                                                  QUESTION

                                                                                  What does \\n means and how to remove it?
                                                                                  Asked 2021-Jan-20 at 07:14

                                                                                  I have a data set and should clean it. One example from my data:

                                                                                  new<-"\\nLocation:\\nMy home is conveniently located around the corner from the Galleria Mall. There's an abundance of food options in every direction of my place. There are also 2 movie theaters within 5 minute driving distance. Addison which is known for their restaurants and nightlife is a 5 minute drive.\\n-DFW  ; Lovefield Airport 20min\\n-American Airlines Center 15min\\n-Downtown 15min\\n-Deep Ellum, Lower Greenville, Uptown 20min"
                                                                                  

                                                                                  I tried to use this function:

                                                                                  str_replace_all(new, "[\n]", "") 
                                                                                  

                                                                                  But it does not work.

                                                                                  My questions:

                                                                                  1. What difference between \n and \\n
                                                                                  2. How to remove it?

                                                                                  ANSWER

                                                                                  Answered 2021-Jan-20 at 07:14

                                                                                  '\n' is a new line character whereas '\\n' is an escaped backslash followed by 'n'.

                                                                                  You can remove it by using gsub :

                                                                                  gsub('\\\\n', '', new)
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/65804641

                                                                                  QUESTION

                                                                                  How to configure Angular-CLI-generated project to include a SharedWorker
                                                                                  Asked 2020-May-21 at 15:18

                                                                                  What are the specific steps to add a SharedWorker to an @angular/cli >1.2-generated project. I would like the SharedWorker to be defined in TypeScript (with full/correct type-definitions editor support), to share interfaces with the main project, and to be continuously compiled and tested along with the main project.

                                                                                  I haven't discovered an example or blog post that describes how to modify a cli-generated project to include either a Worker or a SharedWorker. However, there are several posts (such as this one) which show how to transform an entire cli-generated project to run it as a web worker. But that's not my use-case.

                                                                                  I want to confine interaction with a Lovefield database to a SharedWorker that runs in a separate process from the main application.

                                                                                  Though I've experimented a bit attempting to figure this out, I haven't made much progress. Hopefully someone can save me (and future readers) a lot of time.

                                                                                  ANSWER

                                                                                  Answered 2017-Dec-08 at 13:20

                                                                                  I got this to work following these steps:

                                                                                  1. Create folder src\app\shared-worker
                                                                                  2. Create file src\app\shared-worker\shared-worker.d.ts with the following contents:

                                                                                    SharedWorker definitions

                                                                                  declare module SharedWorker {
                                                                                      interface AbstractWorker extends EventTarget {
                                                                                          onerror: (ev: ErrorEvent) => any;
                                                                                      }
                                                                                      export interface SharedWorker extends AbstractWorker {
                                                                                          port: MessagePort;
                                                                                          onconnect: (messageEvent: MessageEvent) => void;
                                                                                      }
                                                                                  }
                                                                                  declare var SharedWorker: {
                                                                                      prototype: SharedWorker.SharedWorker;
                                                                                      new(stringUrl: string, name?: string): SharedWorker.SharedWorker;
                                                                                  };
                                                                                  // Merely added the onconnect() method to the file provied via:
                                                                                  // npm install --save-dev retyped-sharedworker-tsd-ambient
                                                                                  // Definitions by: Toshiya Nakakura 
                                                                                  
                                                                                • Create file src\app\shared-worker\shared-worker.ts with the following demo contents:

                                                                                  Sharedworker source

                                                                                • /// 
                                                                                  
                                                                                  (self).onconnect = (connectEvent: MessageEvent) => {
                                                                                      const messagePort: MessagePort = (connectEvent.ports as MessagePort[])[0];
                                                                                  
                                                                                      messagePort.onmessage = function (messageEvent: MessageEvent) {
                                                                                          const workerResult: number = messageEvent.data.firstNumber * messageEvent.data.secondNumber;
                                                                                          messagePort.postMessage(workerResult);
                                                                                      };
                                                                                  
                                                                                  };
                                                                                  
                                                                                • Update src\app\app.component.ts as follows:

                                                                                  AppComponent

                                                                                • import { Component, OnInit, ChangeDetectorRef } from '@angular/core';
                                                                                  import { Subject } from 'rxjs/Subject';
                                                                                  import { Observable } from 'rxjs/Observable';
                                                                                  
                                                                                  @Component({
                                                                                      selector: 'app-root',
                                                                                      template: `
                                                                                  
                                                                                  
                                                                                  Invoke Shared Worker
                                                                                  Result: {{result$ | async}}`
                                                                                  })
                                                                                  export class AppComponent implements OnInit {
                                                                                      public firstNumber = 4;
                                                                                      public secondNumber = 8;
                                                                                      private resultSubject = new Subject();
                                                                                      private sharedWorker: SharedWorker.SharedWorker;
                                                                                      public result$: Observable;
                                                                                  
                                                                                      public ngOnInit(): void {
                                                                                          this.result$ = this.resultSubject.asObservable();
                                                                                          if ('SharedWorker' in window) {
                                                                                              this.sharedWorker = new SharedWorker('app/shared-worker/shared-worker.js');
                                                                                              this.sharedWorker.port.onmessage = (messageEvent: MessageEvent) => {
                                                                                                  this.resultSubject.next(messageEvent.data);
                                                                                                  this.changeDetectorRef.detectChanges();
                                                                                              };
                                                                                          }
                                                                                      }
                                                                                  
                                                                                      public postMessageToSharedWorker() {
                                                                                          if (!('SharedWorker' in window)) {
                                                                                              return;
                                                                                          }
                                                                                          this.sharedWorker.port.postMessage({ firstNumber: this.firstNumber, secondNumber: this.secondNumber });
                                                                                      }
                                                                                      constructor(private changeDetectorRef: ChangeDetectorRef) { }
                                                                                  }
                                                                                  
                                                                                • Add "app/shared-worker/shared-worker.js" to the apps.assets node in .angular-cli.json

                                                                                • Install concurrently as a dev dependency: npm i -D concurrently
                                                                                • Create package.json scripts

                                                                                  package.json

                                                                                • "wrk-w": "tsc --noLib --experimentalDecorators --watch node_modules/typescript/lib/lib.es6.d.ts src/app/shared-worker/shared-worker.d.ts src/app/shared-worker/shared-worker.ts",
                                                                                  "dev": "concurrently --kill-others \"npm run wrk-w\" \"npm run start\""
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/46159496

                                                                                  QUESTION

                                                                                  List last messages of chats
                                                                                  Asked 2019-Nov-15 at 21:45
                                                                                  CREATE TABLE message
                                                                                      (`id` int, `from_user_id` text, `to_user_id` text, `created` datetime, `message` text)
                                                                                  ;
                                                                                  
                                                                                  INSERT INTO message
                                                                                      (`id`, `from_user_id`, `to_user_id`, `created`, `message`)
                                                                                  VALUES
                                                                                      (1, 'a', 'b', '2013-01-14 00:00:00', 'hello'),
                                                                                      (2, 'b', 'a', '2013-01-14 00:00:00', 'world'),
                                                                                      (3, 'b', 'a', '2013-01-15 00:00:00', 'hi!!')
                                                                                  ;
                                                                                  

                                                                                  I want to get the last messages applicable to (either sent / received by ) a user. In the above example, there are only 2 users (a, b), and the last message applicable to them is id = 3. So the expected result is

                                                                                  'a', 3, 'b', 'a', '2013-01-15 00:00:00', 'hi!!'
                                                                                  'b', 3, 'b', 'a', '2013-01-15 00:00:00', 'hi!!'
                                                                                  

                                                                                  There are similar questions in SO, the closest I found was here

                                                                                  The last answer seems to what I wanted, but it is complex to wrap my head around, and also couldn't make it work.

                                                                                  I use lovefield and run it in the browser. It supports join and subset of sql syntax, but may not advanced use. Below code gives last message for a provided user id, but I want rows for all users.

                                                                                  SELECT m.*
                                                                                  FROM message m
                                                                                  WHERE 'a' in (from_user_id, to_user_id) AND
                                                                                        m.created = (SELECT MAX(m2.created)
                                                                                                     FROM message m2
                                                                                                     WHERE (m2.from_user_id = m.from_user_id AND m2.to_user_id = m.to_user_id) OR
                                                                                                           (m2.from_user_id = m.to_user_id AND m2.to_user_id = m.from_user_id) 
                                                                                                    )
                                                                                  ORDER BY m.created DESC
                                                                                  

                                                                                  ANSWER

                                                                                  Answered 2019-Nov-15 at 20:56

                                                                                  Below code gives last message for a provided user id, but I want rows for all users.

                                                                                  Your query looks fine. Just remove the condition that filters on a specific user, and you should get the result that you expect:

                                                                                  SELECT m.*
                                                                                  FROM message m
                                                                                  WHERE m.created = (SELECT MAX(m2.created)
                                                                                                     FROM message m2
                                                                                                     WHERE (m2.from_user_id = m.from_user_id AND m2.to_user_id = m.to_user_id) OR
                                                                                                           (m2.from_user_id = m.to_user_id AND m2.to_user_id = m.from_user_id) 
                                                                                                    )
                                                                                  ORDER BY m.created DESC
                                                                                  

                                                                                  Here is an updated version of your fiddle. I added a few more records for other users, and the query returns:

                                                                                  id  from_user_id  to_user_id  created               message
                                                                                  4   d             c           2013-01-17T00:00:00Z  yo!!
                                                                                  3   b             a           2013-01-15T00:00:00Z  hi!!
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/58884477

                                                                                  QUESTION

                                                                                  Is there any client side Db library that supports partial text search?
                                                                                  Asked 2018-Apr-23 at 11:18

                                                                                  I am going thru IndexDB or lovefield but so far could not find way to search partial text like we do in SQL queries via LIKEkeyword. Can someone guide me how could it be achieved?

                                                                                  ANSWER

                                                                                  Answered 2018-Apr-23 at 11:18

                                                                                  lovefield has the match function for pattern matching which is similar to the SIMILAR keyword in SQL which inturn is similar to the LIKE keyword. Please have a look at it and see if it does the job

                                                                                  https://github.com/google/lovefield/blob/master/docs/spec/04_query.md

                                                                                  Source https://stackoverflow.com/questions/49979573

                                                                                  Community Discussions, Code Snippets contain sources that include Stack Exchange Network

                                                                                  Vulnerabilities

                                                                                  No vulnerabilities reported

                                                                                  Install lovefield

                                                                                  You can install using 'npm i lovefield-node' or download it from GitHub, npm.

                                                                                  Support

                                                                                  For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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