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  • Twazzup and App Engine

    Twazzup and App Engine An interview with the developers behind twazzup.com on how App Engine helps them run their application. From: GoogleDevelopers Views: 1298 7 ratings Time: 08:37 More in Science & Technology

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  • Optimize date query for large child tables: GiST or GIN?

    - by Dave Jarvis
    Problem 72 child tables, each having a year index and a station index, are defined as follows: CREATE TABLE climate.measurement_12_013 ( -- Inherited from table climate.measurement_12_013: id bigint NOT NULL DEFAULT nextval('climate.measurement_id_seq'::regclass), -- Inherited from table climate.measurement_12_013: station_id integer NOT NULL, -- Inherited from table climate.measurement_12_013: taken date NOT NULL, -- Inherited from table climate.measurement_12_013: amount numeric(8,2) NOT NULL, -- Inherited from table climate.measurement_12_013: category_id smallint NOT NULL, -- Inherited from table climate.measurement_12_013: flag character varying(1) NOT NULL DEFAULT ' '::character varying, CONSTRAINT measurement_12_013_category_id_check CHECK (category_id = 7), CONSTRAINT measurement_12_013_taken_check CHECK (date_part('month'::text, taken)::integer = 12) ) INHERITS (climate.measurement) CREATE INDEX measurement_12_013_s_idx ON climate.measurement_12_013 USING btree (station_id); CREATE INDEX measurement_12_013_y_idx ON climate.measurement_12_013 USING btree (date_part('year'::text, taken)); (Foreign key constraints to be added later.) The following query runs abysmally slow due to a full table scan: SELECT count(1) AS measurements, avg(m.amount) AS amount FROM climate.measurement m WHERE m.station_id IN ( SELECT s.id FROM climate.station s, climate.city c WHERE -- For one city ... -- c.id = 5182 AND -- Where stations are within an elevation range ... -- s.elevation BETWEEN 0 AND 3000 AND 6371.009 * SQRT( POW(RADIANS(c.latitude_decimal - s.latitude_decimal), 2) + (COS(RADIANS(c.latitude_decimal + s.latitude_decimal) / 2) * POW(RADIANS(c.longitude_decimal - s.longitude_decimal), 2)) ) <= 50 ) AND -- -- Begin extracting the data from the database. -- -- The data before 1900 is shaky; insufficient after 2009. -- extract( YEAR FROM m.taken ) BETWEEN 1900 AND 2009 AND -- Whittled down by category ... -- m.category_id = 1 AND m.taken BETWEEN -- Start date. (extract( YEAR FROM m.taken )||'-01-01')::date AND -- End date. Calculated by checking to see if the end date wraps -- into the next year. If it does, then add 1 to the current year. -- (cast(extract( YEAR FROM m.taken ) + greatest( -1 * sign( (extract( YEAR FROM m.taken )||'-12-31')::date - (extract( YEAR FROM m.taken )||'-01-01')::date ), 0 ) AS text)||'-12-31')::date GROUP BY extract( YEAR FROM m.taken ) The sluggishness comes from this part of the query: m.taken BETWEEN /* Start date. */ (extract( YEAR FROM m.taken )||'-01-01')::date AND /* End date. Calculated by checking to see if the end date wraps into the next year. If it does, then add 1 to the current year. */ (cast(extract( YEAR FROM m.taken ) + greatest( -1 * sign( (extract( YEAR FROM m.taken )||'-12-31')::date - (extract( YEAR FROM m.taken )||'-01-01')::date ), 0 ) AS text)||'-12-31')::date The HashAggregate from the plan shows a cost of 10006220141.11, which is, I suspect, on the astronomically huge side. There is a full table scan on the measurement table (itself having neither data nor indexes) being performed. The table aggregates 237 million rows from its child tables. Question What is the proper way to index the dates to avoid full table scans? Options I have considered: GIN GiST Rewrite the WHERE clause Separate year_taken, month_taken, and day_taken columns to the tables What are your thoughts? Thank you!

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  • Chrome Apps Office Hours: Controlling an AR Parrot Drone

    Chrome Apps Office Hours: Controlling an AR Parrot Drone Ask and vote for questions: goo.gl Join us next week as we show you how we used a Chrome App to control an AR Parrot Drone! This is just one of the many cool things that you can do with Chrome Apps. Using the networking APIs, we were able to pilot the AR Parrot Drone, and get data back from its on-board sensors. We'll take the app apart, show you how were were able to get everything to work, and maybe even take it for a live spin on air! From: GoogleDevelopers Views: 0 0 ratings Time: 00:00 More in Science & Technology

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  • Android: Goto HTTP Url on Button Click

    - by George
    Hi all, I want to go to a web page on the click of a button in my android app. So say, I have a button called "Google", when the user clicks on that button I want google.com to open up on the screen. How is this achieved? Also, is there a way I can gain control back to my app once the user is finished with google? Thanks George

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  • Dartisans Ep. 16: Dart and Web Components Reloaded

    Dartisans Ep. 16: Dart and Web Components Reloaded In this episode of Dartisans, Dimitri Glazkov (one of the godfathers of Web Components) will give a presentation on Web Components. Also, John Messerly and Siggi Cherem (who helped build the dart-lang/dart-web-components library) will give a presentation on using Web Components in Dart. A lot of things have changed since our last episode focused on Web Components, and this is shaping up to be an awesome edition of Dartisans! From: GoogleDevelopers Views: 0 0 ratings Time: 01:00:00 More in Science & Technology

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  • GWT Community Updates

    It's been a while since we've put together what's been going on in the GWT community, and there's no time like the present to do so. Below are...

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  • Chrome Mobile Monthly: Responsive vs Separate Sites

    Chrome Mobile Monthly: Responsive vs Separate Sites Join us on Wednesday October 31st at 9am PT for our Monthly Mobile Web Hangout! This month +Brad Frost will be joining us to talk about responsive design versus separate mobile sites. And in keeping with the season, it's a special Presidential Smackdown Edition. The US presidential race is in full swing, and the candidates are intensely debating the country's hot-button issues. The web design world is entrenched in our own debate about how to address the mobile web: should we create a separate mobile site or create a responsive experience instead? It just so happens that the two US presidential candidates have chosen different mobile web strategies for their official websites. In the red corner is Republican candidate Mitt Romney's dedicated mobile site, while in the blue corner is incumbent president Barack Obama's responsive website. Which will prevail? Sit back, crack open a cold one, and watch the battle unfold as Brad dissect the candidates' sites to uncover best practices and common mobile web pitfalls. From: GoogleDevelopers Views: 0 0 ratings Time: 00:00 More in Science & Technology

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  • General Address Parser for Freeform Text

    - by Daemonic
    We have a program that displays map data (think Google Maps, but with much more interactivity and custom layers for our clients). We allow navigation via a set of combo boxes that prefill certain fields with a bunch of data (ie: Country: Canada, the Province field is filled in. Select Ontario, and a list of Counties/Regions is filled in. Select a county/region, and a city is filled in, etc...). While this guarantees accurate addresses, it's a pain for the users if they don't know where a street address or a city are located (ie, which county/region is kitchener in?). So we are looking at trying to do an address parser with a freeform text field. The user could enter something like this (similar to Google Maps, Bing Maps, etc...): 22 Main St, Kitchener, On And we could compartmentalize it into sections and do lookups on the data and get to the point they are looking for (or suggest alternatives). The problem with this is that how do we properly compartmentalize information? How do we break up the sections and find possible matches? I'm guessing we wouldn't be guaranteed that the user would enter data in a format we always expected (obviously). A follow up to this would be how to present the data if we don't find an exact match (or find multiple exact matches... two cities with the same street name in different counties, for example). We have a ton of data available in the mapping data (mapinfo tab format mostly). So we can do quick scans of street names, cities, states, etc. But I'm not sure about the best way to go about approaching this problem. Sure, using Google Maps would be nice, bue most of our clients are in closed in networks where outside access is not usually allowed and most aren't willing to rely on google maps (since it doesn't contain as much information as they need, such as custom map layers). They could, obviously, go to google and get the proper location then move to our software, but this would time consuming and speed of the process can be quite important.

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  • how to change link url on the web browser's status bar.

    - by sunglim
    I already read many article about this issue in here, SO. I just want to discuss how to do it. NOT the moral issue. -- for example. at the google search webpage. before I click the link, the link does not indicate the google url. but After I click the link with shift-key, the url on the status bar is changed. this mean the google webpage indicate 'Fake URL'. the google compressed script is too difficult to read and analyze. # edited The second url should work on ie8 even if I click with ctrl key.

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  • Is READ UNCOMMITTED / NOLOCK safe in this situation?

    - by Ben Challenor
    I know that snapshot isolation would fix this problem, but I'm wondering if NOLOCK is safe in this specific case so that I can avoid the overhead. I have a table that looks something like this: drop table Data create table Data ( Id BIGINT NOT NULL, Date BIGINT NOT NULL, Value BIGINT, constraint Cx primary key (Date, Id) ) create nonclustered index Ix on Data (Id, Date) There are no updates to the table, ever. Deletes can occur but they should never contend with the SELECT because they affect the other, older end of the table. Inserts are regular and page splits to the (Id, Date) index are extremely common. I have a deadlock situation between a standard INSERT and a SELECT that looks like this: select top 1 Date, Value from Data where Id = @p0 order by Date desc because the INSERT acquires a lock on Cx (Date, Id; Value) and then Ix (Id, Date), but the SELECT acquires a lock on Ix (Id, Date) and then Cx (Date, Id; Value). This is because the SELECT first seeks on Ix and then joins to a seek on Cx. Swapping the clustered and non-clustered index would break this cycle, but it is not an acceptable solution because it would introduce cycles with other (more complex) SELECTs. If I add NOLOCK to the SELECT, can it go wrong in this case? Can it return: More than one row, even though I asked for TOP 1? No rows, even though one exists and has been committed? Worst of all, a row that doesn't satisfy the WHERE clause? I've done a lot of reading about this online, but the only reproductions of over- or under-count anomalies I've seen (one, two) involve a scan. This involves only seeks. Jeff Atwood has a post about using NOLOCK that generated a good discussion. I was particularly interested in a comment by Rick Townsend: Secondly, if you read dirty data, the risk you run is of reading the entirely wrong row. For example, if your select reads an index to find your row, then the update changes the location of the rows (e.g.: due to a page split or an update to the clustered index), when your select goes to read the actual data row, it's either no longer there, or a different row altogether! Is this possible with inserts only, and no updates? If so, then I guess even my seeks on an insert-only table could be dangerous. Update: I'm trying to figure out how snapshot isolation works. It seems to be row-based, where transactions read the table (with no shared lock!), find the row they are interested in, and then see if they need to get an old version of the row from the version store in tempdb. But in my case, no row will have more than one version, so the version store seems rather pointless. And if the row was found with no shared lock, how is it different to just using NOLOCK?

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  • Dartisans ep 12 - Dart + Web Components

    Dartisans ep 12 - Dart + Web Components Web Components are ushering in the "declarative renaissance" for modern web development. Watch this episode of Dartisans to learn how you can build Web Components with Dart, and compile them into JavaScript to run across the modern web. Learn more about Dart at www.dartlang.org From: GoogleDevelopers Views: 2 0 ratings Time: 46:17 More in Science & Technology

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  • GDD-BR 2010 [1H] VC Panel: Entrepreneurship, Incubation and Venture Capital

    GDD-BR 2010 [1H] VC Panel: Entrepreneurship, Incubation and Venture Capital Speakers: Don Dodge, Eric Acher, Humberto Matsuda, Alex Tabor Track: Panels Time slot: H [17:20 - 18:05] Room: 1 Startups can be built and funded anywhere in the world, not just Silicon Valley. Venture Capital investors are investing in startups globally, and funding incubators to hatch their future investments. Find out how you can get into an incubator, or funded by a Venture Capitalist or Angel Investors. Learn from examples in the USA and hear from local VC investors in this panel discussion. Get your questions answered by real investors. From: GoogleDevelopers Views: 6 0 ratings Time: 37:39 More in Science & Technology

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  • Press a Button and open a URL in another ViewController

    - by Dennis Borup Jakobsen
    I am trying to learn Xcode by making a simple app. But I been looking on the net for hours (days) and I cant figure it out how I make a button that open a UIWebView in another ViewController :S first let me show you some code that I have ready: I have a few Buttons om my main Storyboard that each are title some country codes like UK, CA and DK. When I press one of those Buttons I have an IBAction like this: - (IBAction)ButtonPressed:(UIButton *)sender { // Google button pressed NSURL* allURLS; if([sender.titleLabel.text isEqualToString:@"DK"]) { // Create URL obj allURLS = [NSURL URLWithString:@"http://google.dk"]; }else if([sender.titleLabel.text isEqualToString:@"US"]) { allURLS = [NSURL URLWithString:@"http://google.com"]; }else if([sender.titleLabel.text isEqualToString:@"CA"]) { allURLS = [NSURL URLWithString:@"http://google.ca"]; } NSURLRequest* req = [NSURLRequest requestWithURL:allURLS]; [myWebView loadRequest:req]; } How do I make this open UIWebview on my other Viewcontroller named myWebView? please help a lost man :D

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  • GDL Presents: All the Web's a Stage

    GDL Presents: All the Web's a Stage All the Web's a Stage: Building a 3D Space in the Browser Thursday, October 11 - 10:30AM PDT Meet the designers and creative team behind a new sensory Chrome experiment, Movi.Kanti.Revo, in a live, design-focused Q&A. Learn how Cirque du Soleil and Subatomic Systems worked to translate the wonder of Cirque into an environment built entirely with markup and CSS. Host: Pete LePage, Developer Advocate Guests: Gillian Ferrabee, Cirque du Soleil | Nicole McDonald, Director/Creative Director, Subatomic Systems From: GoogleDevelopers Views: 0 0 ratings Time: 00:00 More in Science & Technology

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  • More Blogginess

    Hello everyone, and welcome to a rare (in this space) blog about blogging. My name is Tim Bray, and I’m the new editor of this Android Developers’ Blog...

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  • Existing Calendar Software for Web Service?

    - by OverClocked
    I'd like to offer users of my web platform calendars, and also offer group calendar and public calendar features. I know of Google Calendar API, of course, but that would require all my users to have Google accounts (although, I guess the question is who does not these days). I am wondering if there are any other alternatives? I can write my own, but this has gotten to have been done thousands of times already! I am looking not so much at the front end; we'd probably going to re-skin the UI anyways. But I want a solution that has good backend support for storing events and recurring events, and maintaining multiple calendars. Ideally, the engine would also support things like shared event between different calendars, syncing with other calendars, etc. Sad thing is that this does seem like Google Calendar would cover it, but asking all the users to have to have google accounts may not be realistic. Especially since we'd also want to create group calendars, and I am not sure under who's google account that'd be, and if that'd even be covered under their terms of use. Your thoughts? Thanks.

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  • How to optimize this SQL query for a rectangular region?

    - by Andrew B.
    I'm trying to optimize the following query, but it's not clear to me what index or indexes would be best. I'm storing tiles in a two-dimensional plane and querying for rectangular regions of that plane. The table has, for the purposes of this question, the following columns: id: a primary key integer world_id: an integer foreign key which acts as a namespace for a subset of tiles tileY: the Y-coordinate integer tileX: the X-coordinate integer value: the contents of this tile, a varchar if it matters. I have the following indexes: "ywot_tile_pkey" PRIMARY KEY, btree (id) "ywot_tile_world_id_key" UNIQUE, btree (world_id, "tileY", "tileX") "ywot_tile_world_id" btree (world_id) And this is the query I'm trying to optimize: ywot=> EXPLAIN ANALYZE SELECT * FROM "ywot_tile" WHERE ("world_id" = 27685 AND "tileY" <= 6 AND "tileX" <= 9 AND "tileX" >= -2 AND "tileY" >= -1 ); QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------- Bitmap Heap Scan on ywot_tile (cost=11384.13..149421.27 rows=65989 width=168) (actual time=79.646..80.075 rows=96 loops=1) Recheck Cond: ((world_id = 27685) AND ("tileY" <= 6) AND ("tileY" >= (-1)) AND ("tileX" <= 9) AND ("tileX" >= (-2))) -> Bitmap Index Scan on ywot_tile_world_id_key (cost=0.00..11367.63 rows=65989 width=0) (actual time=79.615..79.615 rows=125 loops=1) Index Cond: ((world_id = 27685) AND ("tileY" <= 6) AND ("tileY" >= (-1)) AND ("tileX" <= 9) AND ("tileX" >= (-2))) Total runtime: 80.194 ms So the world is fixed, and we are querying for a rectangular region of tiles. Some more information that might be relevant: All the tiles for a queried region may or may not be present The height and width of a queried rectangle are typically about 10x10-20x20 For any given (world, X) or (world, Y) pair, there may be an unbounded number of matching tiles, but the worst case is currently around 10,000, and typically there are far fewer. New tiles are created far less frequently than existing ones are updated (changing the 'value'), and that itself is far less frequent that just reading as in the query above. The only thing I can think of would be to index on (world, X) and (world, Y). My guess is that the database would be able to take those two sets and intersect them. The problem is that there is a potentially unbounded number of matches for either for either of those. Is there some other kind of index that would be more appropriate?

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  • Gruber URL Regex tweak to capture "domain.com"

    - by mootymoots
    I found an updated version of John Gruber's regex for url matching in this post by user GianPac, which states it's been adapted to recognize url without protocol or the www part: (?i)\b((?:[a-z][\w-]+:(?:/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.-]+[.][a-z]{2,4}/?)(?:[^\s()<]+|(([^\s()<]+|(([^\s()<]+)))))(?:(([^\s()<]+|(([^\s()<]+))))|[^\s`!()[]{};:'\".,<?«»“”‘’])) Whilst this works in most cases, I found it does not match "google.com". It does match "google.comm" and "google.co.uk", so this must be a small oversight. The trouble is, I literally hate regex. It's the bane of my life. I just want to try and tweak this one more time to allow for "google.com" - can anyone throw me a pointer? I (think) it's something to do with this part of the code: +[.][a-z]{2,4}/?) ?

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  • Unconventional webapps con GWT/Elemental WebRTC e WebGL (parte 2)

    Unconventional webapps con GWT/Elemental WebRTC e WebGL (parte 2) Seconda parte del'intervento di Alberto Mancini del GDG Firenze: realizzata l'app di base, grazie a GWT e NyARToolkit, sarà possibile aggiungere della realtà aumentata direttamente sullo streaming video utilizzando dei marker. Post con esempi di codice all'indirizzo jooink.blogspot.it From: GoogleDevelopers Views: 28 2 ratings Time: 19:08 More in Science & Technology

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  • a question related to URL

    - by Robert
    Dear all,Now i have this question in my java program,I think it should be classified as URL problem,but not 100% sure.If you think I am wrong,feel free to recategorize this problem,thanks. I would state my problem as simply as possible. I did a search on the famouse Chinese search engine baidu.com for a Chinese key word "???" (Obama in English),and the way I do that is to pass a URL (in a Java Program)to the browser like: http://news.baidu.com/ns?word=??? and it works perfectly just like I input the "???”keyword in the text field on baidu.com. However,now my advisor wants another thing.Since he can not read the Chinese webpages,but he wants to make sure the webpages I got from Baidu.com is related to "Obama",he asked me to google translate it back,i.e,using google translate and translate the Chinese webpage to English one. This sounds straightforward.However,I met my problem here. If I simply pass the URL "http://news.baidu.com/ns?word=???" into Google Translate and tick "Chinese to English" translating option,the result looks awful.(I don't know the clue here,maybe related to Chinese character encoding). Alternatively,if now my browser opens ""http://news.baidu.com/ns?word=???" webpage,but I click on the "????" button (that simply means "search"),you will notice the URL will get changed,now if I pass this URL into the Google translate and do the same thing,the result works much better. I hope I am not making this problem sound too complicated,and I appologize for some Chinese words invovled,but I really need your guys' help here.Becasue I did all this in a Java program,I couldn't figure out how to realize that "????"(pressing search button) step then get the new URL.If I could get that new URL,things are easy,I could just call Google translate in my Java code,and pops out the new window to show my advisor. Please share any of your idea or thougts here.Thanks a lot. Robert

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