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  • Performance tuning of a Hibernate+Spring+MySQL project operation that stores images uploaded by user

    - by Umar
    Hi I am working on a web project that is Spring+Hibernate+MySQL based. I am stuck at a point where I have to store images uploaded by a user into the database. Although I have written some code that works well for now, but I believe that things will mess up when the project would go live. Here's my domain class that carries the image bytes: @Entity public class Picture implements java.io.Serializable{ long id; byte[] data; ... // getters and setters } And here's my controller that saves the file on submit: public class PictureUploadFormController extends AbstractBaseFormController{ ... protected ModelAndView onSubmit(HttpServletRequest request, HttpServletResponse response, Object command, BindException errors) throws Exception{ MutlipartFile file; // getting MultipartFile from the command object ... // beginning hibernate transaction ... Picture p=new Picture(); p.setData(file.getBytes()); pictureDAO.makePersistent(p); // this method simply calls getSession().saveOrUpdate(p) // committing hiernate transaction ... } ... } Obviously a bad piece of code. Is there anyway I could use InputStream or Blob to save the data, instead of first loading all the bytes from the user into the memory and then pushing them into the database? I did some research on hibernate's support for Blob, and found this in Hibernate In Action book: java.sql.Blob and java.sql.Clob are the most efficient way to handle large objects in Java. Unfortunately, an instance of Blob or Clob is only useable until the JDBC transaction completes. So if your persistent class defines a property of java.sql.Clob or java.sql.Blob (not a good idea anyway), you’ll be restricted in how instances of the class may be used. In particular, you won’t be able to use instances of that class as detached objects. Furthermore, many JDBC drivers don’t feature working support for java.sql.Blob and java.sql.Clob. Therefore, it makes more sense to map large objects using the binary or text mapping type, assuming retrieval of the entire large object into memory isn’t a performance killer. Note you can find up-to-date design patterns and tips for large object usage on the Hibernate website, with tricks for particular platforms. Now apparently the Blob cannot be used, as it is not a good idea anyway, what else could be used to improve the performance? I couldn't find any up-to-date design pattern or any useful information on Hibernate website. So any help/recommendations from stackoverflowers will be much appreciated. Thanks

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  • Soundcloud uploading to specific set/playlist

    - by user1492347
    I'm uploading some audio to soundcloud, but would like to add the audio to a specific playlist i have also created, without making an extra request (see "Adding Sounds to a Set" http://developers.soundcloud.com/docs/api/guide#uploading). Is it possible to upload directly to a playlist? Alternatively, I could send an extra request to add the track to the playlist but how would you do this in AS3. I see examples for JavaScript but am unsure how this would work in Flash.

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  • C programming getting back into it - the red pill

    - by JavaRocky
    Can someone provide recommended reading, website resources or best practices to follow when programming with C. I am a proficient software developer with strong skills in Java and PHP. Is there standard libraries these days which people use? Like what spring is to java? And standard design patterns for managing memory or even standard libraries for that fact? I want to write solid, maintainable C programs. GO THE RED PILL! :P

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  • What's a good matrix manipulation library available for C ?

    - by banister
    Hi, I am doing a lot of image processing in C and I need a good, reasonably lightweight, and above all FAST matrix manipulation library. I am mostly focussing on affine transformations and matrix inversions, so i do not need anything too sophisticated or bloated. Primarily I would like something that is very fast (using SSE perhaps?), with a clean API and (hopefully) prepackaged by many of the unix package management systems. Note this is for C not for C++. Thanks :)

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  • Google map in jsp document

    - by Todd
    Hi, I am trying to implement google map api into one of my web page which is generated by jsp document, and I am having trouble getting it work. I found some jsp taglibrary by www.lamatek.com/GoogleMaps, but it doesn't seem to work.(I mean even examples on their web site don't work) Has anyone done work on google map in jsp document? I can really use some help or advice.(It seems like jsp docuemnt and javascript just don't get along) p.s I can get static google map work, but that's not my client wants.

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  • technologies beside scaling web applications in a distributed nature

    - by wik
    Hello, I am interested in theory to scale web applications in a distributed nature, i.e. when there is some platform/stack can be extended by others applications running on different servers, etc. I am researching this field and feels the lack of the right keywords :) Interesting concepts found so far: opensocial through API, like shopify does (shopify it's a hosted ecommerce solution) semantic web not quite sure about this one Am I on the right way or am I lost anything? :) Thanks.

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  • Best Project Template to use for Classic Web Service

    - by coffeeaddict
    I'm going to create a new PayPal project. Should I just create a regular Class Library project then add the reference to the WSDL? We are not using WCF. I just want to know what the best project type / template I should use if I'm going to share this project with lets say another WAP web project. I simply want to create wrappers for some of the WSDL that we'll be using in part of the PayPal API.

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  • Facebook Flash app security?

    - by mhdouglas
    I'm developing a Facebook app implemented in Flash, and I'd like to authenticate communication between my app and my server. In other words, I'd like to guarantee that all communication with my server is coming from my app, which has been launched from within facebook by a valid facebook user. Does the Facebook actionscript API support this type of operation? Or am I on my own?

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  • Problem about Chrome Extension

    - by Gnu
    Hi! I try to write an extension and i saw the very restricted policy security. I should create an extension that allows me to listen and download podcast from web. It is possible? I use Chrome OS with VMWare, this OS has additional Api than Google Chrome Browser? Thanks

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  • How to add JSTL to Maven?

    - by La Chamelle
    I'm working on a JSF 2.0 project using Mojarra, PrimeFaces and Tomcat 6.x. I need to use c:forEach for some primefaces component like dynamic number of p:tab but i have problem with the c:forEach. All the other tag of JSTL work nice. I have the following error : java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/LoopTagStatus I use the following xmlns:c="http://java.sun.com/jsp/jstl/core", i tried to replace with xmlns:c="http://java.sun.com/jstl/core" but nothing display with the second. This is the exact version of lib: <dependency> <groupId>javax.faces</groupId> <artifactId>jsf-api</artifactId> <version>2.0.2-FCS</version> </dependency> <dependency> <groupId>com.sun.faces</groupId> <artifactId>jsf-impl</artifactId> <version>2.0.4-b03</version> </dependency> <dependency> <groupId>org.primefaces</groupId> <artifactId>primefaces</artifactId> <version>2.2.1</version> </dependency> <dependency> <groupId>javax.el</groupId> <artifactId>el-api</artifactId> <version>2.2</version> </dependency> <dependency> <groupId>org.glassfish.web</groupId> <artifactId>el-impl</artifactId> <version>2.2</version> </dependency> How i can fix it ? I can give more specific information if needed.

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  • Why do calls to waveOutGetPosition hang?

    - by MusiGenesis
    I'm using the winmm.dll API method waveOutGetPosition to get the current position of the playback of a WAV file. Sometimes this works as expected for me, but eventually one of the calls never returns and my application locks up. I found this thread with a few users who have experienced the same problem: http://social.msdn.microsoft.com/Forums/en-US/windowsgeneraldevelopmentissues/thread/c6a1e80e-4a18-47e7-af11-56a89f638ad7 but no solution. Has anyone run into this problem before?

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  • Single quotes in JavaScript object literal

    - by stone
    I'm looking at the Google Maps API tutorial, and I see this: <script type="text/javascript" src="http://www.google.com/jsapi?autoload={'modules':[{name:'maps', version:3, other_params:'sensor=false'}]}"></script> Why is modules wrapped in single quotes?

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  • Understanding Ruby class vs instance methods

    - by randombits
    I have the following code: #!/usr/bin/ruby class Person def self.speak p = self.new puts "Hello" p.chatter end private def chatter puts "Chattering" end end p = Person.new Person.speak I'd like to make chatter private, accessible only within p.. but I want p to be able to access it within the class method. Is there a better way to design this so chatter isn't available to the public, but a "factory" method like self.speak can call chatter?

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  • Twitter json output

    - by Bunny Rabbit
    $(function(){ $.ajax({ url:'http://api.twitter.com/1/statuses/user_timeline.json?screen_name=user_name&callback=?', //dataType:'json', success:function(data){$('body').append('the data is' +data);} }); }); the above code with dataType line prints out [objects] while with the dataType line commented it prints out nothing ...how can i get it to print the json output from the server rather then the javascript object?

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  • Django: Group by?

    - by Mark
    I'm looking for something like the following: previous_invoices = Invoice.objects.filter(is_open=False).order_by('-created').group_by('user') (group_by() doesn't exist) This would find the most recently closed invoice for each user. This aggregation API seems to let you do stuff like this for counts and sums, but I don't need a count or sum or anything, I actually want the invoice objects!

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  • How to set the email protocol in JavaMail

    - by Dusk
    If I need to get inbox messages by passing request from servlets to javamail API , how can I know the protocol in which to retrieve inbox messages? Do I have to state the protocol in request URL? I've already checked in gmail, where they haven't stated any protocol, then How can I get inbox messages based on particular protocol like: POP3 or IMAP

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  • Why no DatePicker.setDateChangedListener() method

    - by OceanBlue
    Since most widgets have a standard method of setting a listener, setOnXXXListener(), just wondering why there is no setDateChangedListener() method for DatePicker? I know init(int, int, int, OnDateChangedListener) can be used for the same purpose, but surely there must be some reason why Google decided not to use the standard method here. I went through the API docs and couldn't find the reason. Would one of the gurus here know the answer to this?

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  • MKMap showing detail of annotations

    - by yeohchan
    I have encountered a problem of populating the description for each annotation. Each annotation works, but there is somehow an area when trying to click on it. Here is the code. the one in bold is the one that has the problem. -(void)viewDidLoad{ FlickrFetcher *fetcher=[FlickrFetcher sharedInstance]; NSArray *rec=[fetcher recentGeoTaggedPhotos]; for(NSDictionary *dic in rec){ NSLog(@"%@",dic); NSDictionary *string = [fetcher locationForPhotoID:[dic objectForKey:@"id"]]; double latitude = [[string objectForKey:@"latitude"] doubleValue]; double longitude = [[string objectForKey:@"longitude"]doubleValue]; if(latitude !=0 && latitude != 0 ){ CLLocationCoordinate2D coordinate1 = { latitude,longitude }; **NSDictionary *adress=[NSDictionary dictionaryWithObjectsAndKeys:[dic objectForKey:@"owner"],[dic objectForKey:@"title"],nil];** MKPlacemark *anArea=[[MKPlacemark alloc]initWithCoordinate:coordinate1 addressDictionary:adress]; [mapView addAnnotation:anArea]; } } } Here is what the Flickr class does: #import <Foundation/Foundation.h> #define TEST_HIGH_NETWORK_LATENCY 0 typedef enum { FlickrFetcherPhotoFormatSquare, FlickrFetcherPhotoFormatLarge } FlickrFetcherPhotoFormat; @interface FlickrFetcher : NSObject { NSManagedObjectModel *managedObjectModel; NSManagedObjectContext *managedObjectContext; NSPersistentStoreCoordinator *persistentStoreCoordinator; } // Returns the 'singleton' instance of this class + (id)sharedInstance; // // Local Database Access // // Checks to see if any database exists on disk - (BOOL)databaseExists; // Returns the NSManagedObjectContext for inserting and fetching objects into the store - (NSManagedObjectContext *)managedObjectContext; // Returns an array of objects already in the database for the given Entity Name and Predicate - (NSArray *)fetchManagedObjectsForEntity:(NSString*)entityName withPredicate:(NSPredicate*)predicate; // Returns an NSFetchedResultsController for a given Entity Name and Predicate - (NSFetchedResultsController *)fetchedResultsControllerForEntity:(NSString*)entityName withPredicate:(NSPredicate*)predicate; // // Flickr API access // NOTE: these are blocking methods that wrap the Flickr API and wait on the results of a network request // // Returns an array of Flickr photo information for photos with the given tag - (NSArray *)photosForUser:(NSString *)username; // Returns an array of the most recent geo-tagged photos - (NSArray *)recentGeoTaggedPhotos; // Returns a dictionary of user info for a given user ID. individual photos contain a user ID keyed as "owner" - (NSString *)usernameForUserID:(NSString *)userID; // Returns the photo for a given server, id and secret - (NSData *)dataForPhotoID:(NSString *)photoID fromFarm:(NSString *)farm onServer:(NSString *)server withSecret:(NSString *)secret inFormat:(FlickrFetcherPhotoFormat)format; // Returns a dictionary containing the latitue and longitude where the photo was taken (among other information) - (NSDictionary *)locationForPhotoID:(NSString *)photoID; @end

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  • Is there an easy way to read an XML file in Java?

    - by user303135
    I'm fairly new to Java and am writing an app that needs an XML config file. The problem I have is that there doesn't seem to be any easy way to do this, which seems a bit strange. I've looked SAX and DOM and both seem quite complicated. Are there any other good API's out there? What's the best way to do this in Java? Thanks...

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  • MBProgressHUD for Mac? - Cocoa

    - by Kevin
    Hey there everyone, So I'm used to the iPhone API, and I used MBProgressHUD a lot in my iPhone applications, but since I started developing apps for the Mac I noticed that I can't use MBProgressHUD. Is there an alternative that will do the same job as the MBProgressHUD? I notice that apple has it in their OS as well. If anyone could help me find an alternative for MBProgressHUD, I would greatly appreciate it!! Thanks, Kevin

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  • PHP 5.2 Function needed for GENERIC sorting of a recordset array

    - by donbriggs
    Somebody must have come up with a solution for this by now. We are using PHP 5.2. (Don't ask me why.) I wrote a PHP class to display a recordset as an HTML table/datagrid, and I wish to expand it so that we can sort the datagrid by whichever column the user selects. In the below example data, we may need to sort the recordset array by Name, Shirt, Assign, or Age fields. I will take care of the display part, I just need help with sorting the data array. As usual, I query a database to get a result, iterate throught he result, and put the records into an assciateiave array. So, we end up with an array of arrays. (See below.) I need to be able to sort by any column in the dataset. However, I will not know the column names at design time, nor will I know if the colums will be string or numeric values. I have seen a ton of solutions to this, but I have not seen a GOOD and GENERIC solution Can somebody please suggest a way that I can sort the recordset array that is GENERIC, and will work on any recordset? Again, I will not know the fields names or datatypes at design time. The array presented below is ONLY an example. UPDATE: Yes, I would love to have the database do the sorting, but that is just not going to happen. The queries that we are running are very complex. (I am not really querying a table of Star Trek characters.) They include joins, limits, and complex WHERE clauses. Writing a function to pick apart the SQL statement to add an ORDER BY is really not an option. Besides, sometimes we already have the array that is a result of the query, rather than the ability to run a new query. Array ( [0] => Array ( [name] => Kirk [shrit] => Gold [assign] => Bridge ) [1] => Array ( [name] => Spock [shrit] => Blue [assign] => Bridge ) [2] => Array ( [name] => Uhura [shrit] => Red [assign] => Bridge ) [3] => Array ( [name] => Scotty [shrit] => Red [assign] => Engineering ) [4] => Array ( [name] => McCoy [shrit] => Blue [assign] => Sick Bay ) )

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