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  • Create new or update existing entity at one go with JPA

    - by Alex R
    A have a JPA entity that has timestamp field and is distinguished by a complex identifier field. What I need is to update timestamp in an entity that has already been stored, otherwise create and store new entity with the current timestamp. As it turns out the task is not as simple as it seems from the first sight. The problem is that in concurrent environment I get nasty "Unique index or primary key violation" exception. Here's my code: // Load existing entity, if any. Entity e = entityManager.find(Entity.class, id); if (e == null) { // Could not find entity with the specified id in the database, so create new one. e = entityManager.merge(new Entity(id)); } // Set current time... e.setTimestamp(new Date()); // ...and finally save entity. entityManager.flush(); Please note that in this example entity identifier is not generated on insert, it is known in advance. When two or more of threads run this block of code in parallel, they may simultaneously get null from entityManager.find(Entity.class, id) method call, so they will attempt to save two or more entities at the same time, with the same identifier resulting in error. I think that there are few solutions to the problem. Sure I could synchronize this code block with a global lock to prevent concurrent access to the database, but would it be the most efficient way? Some databases support very handy MERGE statement that updates existing or creates new row if none exists. But I doubt that OpenJPA (JPA implementation of my choice) supports it. Event if JPA does not support SQL MERGE, I can always fall back to plain old JDBC and do whatever I want with the database. But I don't want to leave comfortable API and mess with hairy JDBC+SQL combination. There is a magic trick to fix it using standard JPA API only, but I don't know it yet. Please help.

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  • What Controller/Action will this go to?

    - by rkrauter
    Assume this is the first route entry: routes.MapRoute( "myRoute", "employees/{city}/{pageNumber}", new { controller="Employees", action = "List", pageNumber = 1 } ); If I make the following request employees/london/2 it gets matched to the following action method: public ActionResult List(string city) {} How did that happen? I did not specify "city" in my object defaults: new { controller="Employees", action = "List", pageNumber = 1 } Please explain. Thanks!

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  • sqlite3 'database is locked' won't go away with retries

    - by Azarias
    I have a sqlite3 database that is accessed by a few threads (3-4). I am aware of the general limitations of sqlite3 with regards to concurrency as stated http://www.sqlite.org/faq.html#q6 , but I am convinced that is not the problem. All of the threads both read and write from this database. Whenever I do a write, I have the following construct: try: Cursor.execute(q, params) Connection.commit() except sqlite3.IntegrityError: Notify except sqlite3.OperationalError: print sys.exc_info() print("DATABASE LOCKED; sleeping for 3 seconds and trying again") time.sleep(3) Retry On some runs, I won't even hit this block, but when I do, it never comes out of it (keeps retrying, but I keep getting the 'database is locked' error from exc_info. If I understand the reader/writer lock usage correctly, some amount of waiting should help with the contention. What this sounds like is deadlock, but I do not use any transactions in my code, and every SELECT or INSERT is simply a one off. Some threads, however, keep the same connection when they do their operation (which includes a mix of SELECTS and INSERTS and other modifiers). I would appericiate it if you could shade a light on this, and also ways around fixing it (besides using a different database engine.)

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  • Should I go with Varnish instead of nginx?

    - by gotts
    I really like nginx. But recently I've found that varnish gives you an opportunity to implement smart caching revers proxy layer(with URL purging). I have a cluster of mongrels which are pretty resource-intensive so if this caching layer can remove some load from mongrels this can be a great thing. I didn't find a way to implement the caching layer(with for application pages; static content is cacheable of course) same with nginx.. Should I use Varnish instead? What would you recommend?

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  • Chrome: automatically redirect me to highest ranking search result, like Firefox does

    - by Siim K
    How to emulate the Firefox (I'm using v3.6) address bar search redirection in Google Chrome? For example, if I type... imdb moon ...to the address bar and press Return in Firefox then it redirects me straight to http://www.imdb.com/title/tt1182345/ (and I've not visited the page before) When I try this is Chrome then I just get the google search page http://www.google.com/search?sourceid=chrome&ie=UTF-8&q=imdb+moon So seems like Firefox redirects automatically to the highest ranking search result URL - is there a setting or add-on for Chrome to achieve the same behaviour?

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  • Deleting branches in git causes gitk to go wild

    - by a2h
    I decided to delete a few branches from a (personal project) repository of mine that were merged into master after confirming on #git that leftover branches aren't really necessary. However, gitk's visualisation of my repository's history as a result has been completely screwed up. Basically something like this: With those branches from commits appearing out of nowhere eventually going back into some other commits up ahead. A merge did not occur at all of the points, and I only had around 5 extra branches. Is this normal? Is there any fix for this?

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  • Where did my Visual Studio exception assistant go?

    - by Steven
    Since a couple of weeks the Visual Studio (2008 9.0.30729.1 SP) Exception Assistant has stopt appearing while debugging using the C# IDE. Instead the old ugly and useless debug dialog comes up: To make sure, I've checked the following: "Tools / Options / Debugging / General / Enable the exception assistant" is on. "Debug / Exceptions / Common Language Runtime Exceptions / Thrown" is on. I reset my Visual Studio Settings. I googled. I checked all relevant stackoverflow questions. How can I get the Exception Assistant back? Who gives me the golden tip?

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  • outgoing mail for web app (multiple domains as sender)

    - by solid
    I have a web app "myapp.com" that users can use to set up their own websites. Our application is written in php and should be able to do the following: send mails to our own users "from: [email protected]" send mails from our clients to their clients "from: [email protected]" We don't need to take care of incoming mails, just send out mails with the correct from and reply-to addresses. We cannot make this work using Google Apps (limited to our own domain in the from-field) and we cannot make google apps or google apps domains for all our clients, so we are looking for another simple to manage and set up solution. Does anyone have experience with this, please let me know! Thanks

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  • how to go to the same page after login in PHP

    - by Fero
    Hi all, For example, STEP 1: I am browsing a page without logging in and my last page before logging in is beforeLogin.php STEP 2: Now my prob is when i logged in i am redirecting to the index.php page. Instead i should be redirected to the last page what i had browsed. That is from the above example is should redirected to beforeLogin.php How should this can be done. Any help will be appreciable. thanks in advance

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  • What should go in each MVVM triad?

    - by Harry
    OK, let's say I am creating a program that will list users contacts in a ListBox on the left side of the screen. When a user clicks on the contact, a bunch of messages or whatever appears in the main part of the window. Now my question is: how should the MVVM triads look? I have two models: Contact, and Message. The Contact model contains a list of Message models. Each ViewModel object will contain a single corresponding Model, right? And what about the Views? I have a "MainView" that is the main window, that will have things like the menu, toolbar etc. Do I put the ListBox in the MainView? My confusion is with what to put where; for example, what should the ContactView contain? Just a single instance of a contact? So the DataTemplate, ControlTemplate, context menus, styles etc for that single contact, and then just have a ListBox of them in the MainView...? Thanks.

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  • how to go back to first if statement if no choices are valid - python

    - by wondergoat77
    how can i have python move to the top of an if statement if nothing is satisfied correctly i have a basic if/else statement like this: print "pick a number, 1 or 2" a = int(raw_input("> ") if a == 1: print "this" if a == 2: print "that" else: print "you have made an invalid choice, try again." what i want is to prompt the user to make another choice for 'a' this if statement without them having to restart the entire program, but am very new to python and am having trouble finding the answer online anywhere.

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  • [C++] My First Go With Function Templates

    - by bobber205
    Thought it was pretty straight forward. But I get a "iterator not dereferencable" errro when running the below code. What's wrong? template<typename T> struct SumsTo : public std::binary_function<T, T, bool> { int myInt; SumsTo(int a) { myInt = a; } bool operator()(const T& l, const T& r) { cout << l << " + " << r; if ((l + r) == myInt) { cout << " does add to " << myInt; } else { cout << " DOES NOT add to " << myInt; } return true; } }; void main() { list<int> l1; l1.push_back(1); l1.push_back(2); l1.push_back(3); l1.push_back(4); list<int> l2; l2.push_back(9); l2.push_back(8); l2.push_back(7); l2.push_back(6); transform(l1.begin(), l1.end(), l2.begin(), l2.end(), SumsTo<int>(10) ); }

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  • SMTP and IIS maild from my website

    - by RupDog
    Hi, I am using the free version for Google Apps to host my mail. I want to set is so that mail is routed via google apps as this will give me a much better reputation and mail will not go to the spam folder as much. Doe anyone know how this is done? Would I need to setup IIS to do this? The site is writeen in C# ASP.NET. So Could I perhaps just update the web.config file to route mail via google apps?

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  • How is a Chromebook better than using Chrome browser on another OS?

    - by bigpopakap
    I'm looking into getting a Chromebook as a lightweight device to use for basic functions. I'm fully aware of some of the limitations like no native apps, limited functionality while offline (though this is getting better with Google Drive's offline capabilities). Currently, I have a Windows machine on which I've installed Google Drive, so files in that folder are synced. And I use Chrome as my browser. So I have access to all the same apps (Drive, Calendar, Gmail, Google Music, etc.). Is there any advantage to having a Chromebook over my current setup, other than the speed of the lightweight Chrome OS?

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  • Can't get images to go under each other

    - by Thomas Pen
    ello I'm new to html and css and tried to display a images that are floating right. Now I want to get the images under each other but is doesn't work. Can someone help me? this my css code for the images: .imagesLeft{ float: left; margin: 5px; } .imagesRight{ float: right; margin: 5px; } this my html code for the images: <div class="imagesRight"> <img src="../images/medewerkers.jpg"> </div> <div class="imagesRight"> <img src="../images/medewerkers1.jpg"> </div> <div class="imagesRight"> <img src="../images/medewerkers2.jpg"> </div> Thanks in advance !

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  • app.config - where should it go?

    - by Piers
    This is a follow on from here: Storing database settings outside app.config So I know it's possible to have one app.config, with different sections externalised, all with different values. But are they like the web.config files in asp.net projects where you can just copy it into the same folder as the rest of the files and it will work, or do I need to compile it in somewhere. Also, won't it be overwritten by the .exe.config file? Edit Ok, so I worded this question a bit badly. I've updated it.

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  • How do I set streetView in my mapview

    - by John
    I an working on an android project whereby i need to set my map to zoom in and show a more detailed view of my map, like the streets of where i want my coordinates to triangulate. The problem is in Mapview class, setStreetView is deprecated, wat is the alternative? This is how setStreetView looks when i use it. package com.HelloMapView; import java.util.List; import com.google.android.maps.GeoPoint; import com.google.android.maps.MapActivity; import com.google.android.maps.MapController; import com.google.android.maps.MapView; import com.google.android.maps.Overlay; import com.google.android.maps.OverlayItem; import android.app.Activity; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.widget.LinearLayout; public class HelloMapView extends MapActivity { MapView mapview; LinearLayout linearlayout; List<Overlay> mapOverlay; Drawable drawable; HelloItemizedOverlay itemizedOverlay; @SuppressWarnings("deprecation") @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mapview=(MapView)findViewById(R.id.mapview); mapview.setBuiltInZoomControls(true); mapview.setStreetView(true); mapOverlay=mapview.getOverlays(); drawable=this.getResources().getDrawable(R.drawable.androidmarker); itemizedOverlay=new HelloItemizedOverlay(drawable); GeoPoint geoPoint=new GeoPoint(19240000,-99120000); OverlayItem overlayitem=new OverlayItem(geoPoint,"",""); itemizedOverlay.addoverlay(overlayitem); mapOverlay.add(itemizedOverlay); } @Override protected boolean isRouteDisplayed() { // TODO Auto-generated method stub return false; } } this does not work it only shows square boxes with no map at all

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  • CodeIgniter: Where should a particular functionality go ?

    - by Samnan
    I have an application in codeigniter and a page needs to perform the following tasks 1 - controller decides which model to use based of the url and parameters 2 - controller loads the model and get the data from it 3 - controller formats the data in a particular format, depending on the items in it 4 - controller loads a common view, which will display the data (formatted data contains simple display fields) now there is a search page, which needs to do a text query against all of the possible text fields in database in all tables. It needs to show each type of data in its own formatted output on a single page as a list. The problem: The search controller can do the search, dynamically load model for each record type, and get the data from model. Problem comes when the data needs to be formatted. It looks that ideally the search controller should load another controller which will provide formatted data ... There is where it gets out of control ... My question is: What am I doing wrong? Is there any better way to do this? How would you do the same to solve the problem?

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  • jQueryUI dialog won't go modal

    - by Theopile
    I need a modal dialog to open ontop of an tinyMCE editor and other jQuerified items. I followed the jquery site but its not modal, I can still change and access the rest of the page. $('#sureDelete').dialog({ modal: true, buttons: { "Yes": function(){ $('li#'+$id).remove(); }, "No":function(){ } }, draggable: false }); <div id="dialogs"> <div id="sureDelete">Are you sure you want to delete this page?</div> </div>

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  • Confusion with cookie session token and oauth2.0 don't know where to go anymore

    - by byte_slave
    Hi guys, I'm completely confused, frustrated and nothing seems to make sense and work any more. I' dev some iframe fb app and i've been using the javascript sdk (FB.Init()) to get the access_token, but doesn't always work, sometimes i'm already logged into FB and doesn't works... Did some reading, and read also that there is problems using cookies in iframes in Opera and IE, so I was thinking in use the OAuth 2.0 but i'm not sure how via facebook sdk c# and now I'm now completely lost, don't know if i still need to use the javascript FB.Init(). Documentation out there is poor and unclear, a lot of stuff refers to old code, and after hours of reading, jumping on examples, i'm completely messed up and confused. Can some, please, point/explain/enlightening me about this? Thanks a lot guys, appreciated! Merry christmas!

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