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  • How do I left join tables in unidirectional many-to-one in Hibernate?

    - by jbarz
    I'm piggy-backing off of http://stackoverflow.com/questions/2368195/how-to-join-tables-in-unidirectional-many-to-one-condition. If you have two classes: class A { @Id public Long id; } class B { @Id public Long id; @ManyToOne @JoinColumn(name = "parent_id", referencedColumnName = "id") public A parent; } B - A is a many to one relationship. I understand that I could add a Collection of Bs to A however I do not want that association. So my actual question is, Is there an HQL or Criteria way of creating the SQL query: select * from A left join B on (b.parent_id = a.id) This will retrieve all A records with a Cartesian product of each B record that references A and will include A records that have no B referencing them. If you use: from A a, B b where b.a = a then it is an inner join and you do not receive the A records that do not have a B referencing them. I have not found a good way of doing this without two queries so anything less than that would be great. Thanks.

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  • why when I delete a parent on a one to many relationship on grails the beforeInsert event is called

    - by nico
    hello, I have a one to many relationship and when I try to delete a parent that haves more than one child the berforeInsert event gets called on the frst child. I have some code in this event that I mean to call before inserting a child, not when i'm deleting the parent! any ideas on what might be wrong? the entities: class MenuItem { static constraints = { name(blank:false,maxSize:200) category() subCategory(nullable:true, validator:{ val, obj -> if(val == null){ return true }else{ return obj.category.subCategories.contains(val)? true : ['invalid.category.no.subcategory'] } }) price(nullable:true) servedAtSantaMonica() servedAtWestHollywood() highLight() servedAllDay() dateCreated(display:false) lastUpdated(display:false) } static mapping = { extras lazy:false } static belongsTo = [category:MenuCategory,subCategory:MenuSubCategory] static hasMany = [extras:MenuItemExtra] static searchable = { extras component: true } String name BigDecimal price Boolean highLight = false Boolean servedAtSantaMonica = false Boolean servedAtWestHollywood = false Boolean servedAllDay = false Date dateCreated Date lastUpdated int displayPosition void moveUpDisplayPos(){ def oldDisplayPos = MenuItem.get(id).displayPosition if(oldDisplayPos == 0){ return }else{ def previousItem = MenuItem.findByCategoryAndDisplayPosition(category,oldDisplayPos - 1) previousItem.displayPosition += 1 this.displayPosition = oldDisplayPos - 1 this.save(flush:true) previousItem.save(flush:true) } } void moveDownDisplayPos(){ def oldDisplayPos = MenuItem.get(id).displayPosition if(oldDisplayPos == MenuItem.countByCategory(category) - 1){ return }else{ def nextItem = MenuItem.findByCategoryAndDisplayPosition(category,oldDisplayPos + 1) nextItem.displayPosition -= 1 this.displayPosition = oldDisplayPos + 1 this.save(flush:true) nextItem.save(flush:true) } } String toString(){ name } def beforeInsert = { displayPosition = MenuItem.countByCategory(category) } def afterDelete = { def otherItems = MenuItem.findAllByCategoryAndDisplayPositionGreaterThan(category,displayPosition) otherItems.each{ it.displayPosition -= 1 it.save() } } } class MenuItemExtra { static constraints = { extraOption(blank:false, maxSize:200) extraOptionPrice(nullable:true) } static searchable = true static belongsTo = [menuItem:MenuItem] BigDecimal extraOptionPrice String extraOption int displayPosition void moveUpDisplayPos(){ def oldDisplayPos = MenuItemExtra.get(id).displayPosition if(oldDisplayPos == 0){ return }else{ def previousExtra = MenuItemExtra.findByMenuItemAndDisplayPosition(menuItem,oldDisplayPos - 1) previousExtra.displayPosition += 1 this.displayPosition = oldDisplayPos - 1 this.save(flush:true) previousExtra.save(flush:true) } } void moveDownDisplayPos(){ def oldDisplayPos = MenuItemExtra.get(id).displayPosition if(oldDisplayPos == MenuItemExtra.countByMenuItem(menuItem) - 1){ return }else{ def nextExtra = MenuItemExtra.findByMenuItemAndDisplayPosition(menuItem,oldDisplayPos + 1) nextExtra.displayPosition -= 1 this.displayPosition = oldDisplayPos + 1 this.save(flush:true) nextExtra.save(flush:true) } } String toString(){ extraOption } def beforeInsert = { if(menuItem){ displayPosition = MenuItemExtra.countByMenuItem(menuItem) } } def afterDelete = { def otherExtras = MenuItemExtra.findAllByMenuItemAndDisplayPositionGreaterThan(menuItem,displayPosition) otherExtras.each{ it.displayPosition -= 1 it.save() } } }

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  • What software development process should I learn first for a solo project?

    - by Omar Kohl
    I want to develop a project on my own (if it is sucessful more people might start working on it too). Also I want to apply some proper software engineering from the first until the last day. On one hand just to try it out and compare results with previous projects that were just about writing code quick and dirty, and on the other hand to learn! I know the proper answer to this question is "It depends very much on the project...", "There is no single correct answer...". But I just need someplace to start, somewhere where every step is written down and tells me what to do. If I'm not happy next time I'll try something else. So, how/where should I start? I would love to hear some book suggestions cause I'm all about books :-D.

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  • Ubuntuone fails to sync with 'File Sync starting...' displayed

    - by a different ben
    I am on 12.04 using ubuntuone-client 3.0.1-0ubuntu1.0.1. I actually have two machines that I sync with, having the same Ubuntu version and ubuntuone-client version. One is fine, the other is not. File sync has frozen within a user-defined folder under my home folder. The graphical client reports in the top-right corner: 'File Sync starting...', but this doesn't change. I have two files with changes that show a syncing overlay in Nautilus. They are both very small text files. Here are some details: harb@joan:~$ u1sdtool --status State: READY connection: With User Not Network description: ready to connect is_connected: False is_error: False is_online: False queues: WORKING harb@joan:~$ u1sdtool --current-transfers Current uploads: 0 Current downloads: 0 The status seems to suggest that I am not connected to a network, however I am connected to a network - in fact I am accessing this machine via NX. Is it not working because I am connected via NX? Happy to provide other info, just not sure what would be useful.

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  • High I/O wait after login

    - by Jackson Tan
    I've noticed that the ubuntuone-syncdaemon hogs up the hard disk every time I log in to Ubuntu (10.04). This takes up to two or three minutes, which makes Ubuntu insufferably slow. Opening Firefox is okay, but the browser is constantly greyed out and lags horribly. Given that I often shut down my laptop when I don't use it (about 3 to 4 times a day), this makes Ubuntu lose much of its lustre because of its long boot time. Is this a normal behaviour of Ubuntu One? Is it intended? Note that I've actually posted this in the forums here, but I received only few replies.

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  • My ubuntuone is broken, what is the problem?

    - by user6962
    I am on 10.10 and u1sdtool seems to be completely broken. I reinstalled it, no change. I can add my PC to the account, but it is added twice(!) every time I tried. So I have my netbook and two times my PC in the account. The netbook with 10.04 has no problems. Below is the error msg I get when attempting to startup Ubuntu One on the command line. desktop:~$ u1sdtool --status Oops, an error ocurred: Traceback (most recent call last): Failure: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. desktop:~$ Starting it from the Me Menu has the same effect, the HDD will get really busy for a minute and then nothing happens, the client will not start. Nothing in the syslog or anywhere.

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  • U1 Music Streaming: Is it possible to have album cover art for OGG files?

    - by Will Daniels
    Just started trying out the U1 music streaming service and so far very pleased. The one issue I have that could be a deal-breaker when it comes time to pay up is that half of my collection is OGG Vorbis and I cannot find a way to show album art for OGG files. I already tried adding a cover.jpg to the folder and embedding the image via easyTAG (works for MP3 but not OGG). Does anybody have a solution besides transcoding them all to MP3? Will this likely be supported in future?

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  • Mobile music playback on android phone keeps buffering

    - by ianio
    I have copied some music to a ubuntu synced folder on my karmic machine. I have the Ubuntu One android app installed on android 2.2 phone. When listening to music I get frequent breaks whilst the music is buffering, even with full signal. every other music streaming servie such as last fm and bbc player are fine. What is going wrong? mp3s should not have trouble buffering over a good 3g signal. I have set cache size to 200mb but i cant find a buffer size. Is it my mp3s? they are usually in the order of 320kb/s this is a breaker for me if there is no solution which is a massive shame as i like the principal of the software. cheers

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  • DesktopCouch does not sync

    - by burli
    I have here two computers, both installed with Ubuntu 10.10. The Laptop uses the Netbook Edition. Both are connected, file sync and Tomboy Notes are working. My Desktop syncs databases with Ubuntu One, my Laptop does not. If I delete for example the contacts Database on my Desktop, the database is back a view seconds later. If I delete the same database on my laptop, nothing happens. (I'm using Futon) If I kill beam, delete the config and try to restart with the dbus-send I got an error Error org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. How can I fix that?

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  • U1 music shows unknown artist, how can I make it recognize m4a files?

    - by bisi
    Hello all, I am in the process of uploading my music library as a backup to U1, but I figured, why not also enjoy Ubuntu 1 music on my iPhone? With a few difficulties to start, the upload is now in progress, but I've noticed that there is a huge percentage of files in the unknown artist folder, and I believe it is all of my m4a files. They play fine, but without any information. Coming from an iTunes background, and having bought the majority of my music on the iTunes store, I wonder how I could make this work, easily? I am on Maverick (afaik), but About Ubuntu shows 11.04. I use Banshee as my music manager, and I monitor my sync using Ubuntu one preferences, ubuntuone-indicator and magicicada. The total file size of my music folder is 38.9GB. Thank you for your help!! And apologies if I couldn't find a thread where this was already covered...

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  • Ubuntuone Preferences does not show usage, name, e-mail, current plan

    - by Jim
    Ubuntuone is correctly synchronizing selected files between two computers running Ubuntu 10.10. When I open Ubuntuone Preferences, Account tab, on one computer it does not display the usage, name e-mail or current plan. On the other computer all information is shown correctly. On the Devices tab the 2 computers are not shown. They do show correctly on the other computer. Any ideas on how to fix this problem. I have reinstalled Ubuntuone per this link: https://wiki.ubuntu.com/UbuntuOne/FAQ/HowDoICompletelyRemoveAndReinstallUbuntuOne

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  • Files don't sync with U1.

    - by wrenchman76
    I am running 10.1 (all current updates have been installed) and I'm unable to sync any files to U1. U1 shows my computer as being added to my account and I bought enough space to hold all the files I want backed up, but for some reason it still doesn't sync. I have marked the files to be synced and even checked the devices tab in the U1 preferences; it shows my computer as being part of my account but the connect button is inoperable and restart doesn't produce any effect when clicked. I have read all the FAQ I can find relating to my problem and have tried all the suggestions that seem to adress problems similar to mine, as well as adding and removing my computer from my account a bunch of times. None of these produced any effect one way or another. I'm not very techno savvy so step by step and/or lay mens terms are greatly appreciated, Thank you

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  • Does saving my progress on a U1-synced file/folder put unneccesary strain on the servers?

    - by Chauncellor
    I love Ubuntu One and I use it all the time. I have my documents and music composition folders set to sync. It's been a real boon. However, sometimes I feel that constantly saving my progress forces the file to sync dozens and dozens of times to the servers. It seems wasteful to me so I've been disconnecting U1 until I'm finished working on a project. Is this an unnecessary action that I am taking? I know it's using Amazon's storage but I'm still paranoid that I'm costing Canonical money when I constantly save my progress.

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  • Why do I need to republish a file when I update it?

    - by user13089
    The story is: I am coding a program and at the same time, i want to share it with my group members using ubuntu. They don't have an Ubuntu One account and what I do is to publish the file and my friends just get the link and the file. But, strangely or not, every time I upload a new version of this file (I add more code and save it), the used link seems to be "outdated" and I need to publish the same file again and to get a new link every time i modify the same file. Couldn't it be possible to save a new version of your file and the same link just "points" to the newer version?

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  • UbuntuOne: how to sync folders on different partitions (symlink?)

    - by user37155
    I use Ubuntu One to synch my home/Documents folder among more computers. On a portable tablet I have set the Documents folder in a separate Fat32 partition named sda6, and I made it default documents folder with Ubuntu Tweaks. How do I synchronize it with my /Documents cloud ? I tried to link /sda/Documents in my home folder but it didn't succeed: UbuntuOne still tries to set an own Documents folder and doesn't let me sync the linked folder with the cloud. What can I do, would please anyone help me ? Greetings, Francesco

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  • Lyrics on mp3 ID-tag

    - by puchrojo
    Since a few years ago I stopped listening to CDs and began to listen to mp3 only. At the begining I continued to buy the CDs to support the artist, but later I started to buy the album direct online as mp3. The problem is, that by this, I don't have the lyrics for the songs. For the "commercial" or popular music it is not a big problem, but for others there are no lyrics on the Internet. How can I make use of the ID3-tag for the lyrics? Is there a music store that adds lyrics to the mp3 files sold? Can this be done with Ubuntu One? Another alternative would be to have an Internet lyrics databases like musixmatch.com supported.

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  • How can I update a row and insert a new one automatically in NHibernate with one call to Save?

    - by snicker
    Let's say I have a Type II SCD database, that is basically append only. I am using NHibernate to persist objects to my database. I have an object like so: Pony |- int Id |- Guid EntityId |- string PonyName |- string PonyColor |- int RevisionValidFrom |- int RevisionValidTo Here's a typical scenario: Pony myLittlePony = myStable.GetLatestPonyByGuid("0f1ac08a-3328-43db-b278-77c272e4fea3"); myLittlePony.PonyColor = "Fish"; myNHSession.Save(myLittlePony); I want to be able to call Session.Save(myLittlePony) and have NHibernate UPDATE the old entity's RevisionValidTo to whatever I specify and then INSERT the modified Pony as a new row with a new Id, basically as if it were a brand new object being persisted to the DB.

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  • Delphi Typed Constants in Case Statements

    - by Andreas Rejbrand
    What is the most elegant (or least ugly) way of using typed constants in a case statement in Delphi? That is, assume for this question that you need to declare a typed constant as in const MY_CONST: cardinal = $12345678; ... Then the Delphi compiler will not accept case MyExpression of MY_CONST: { Do Something }; ... end; but you need to write case MyExpression of $12345678: { Do Something }; ... end; which is error-prone, hard to update, and not elegant. Is there any trick you can employ to make the compiler insert the value of the constant (preferably by checking the value of the constant under const in the source code, but maybe by looking-up the value at runtime)? We assume here that you will not alter the value of the "constant" at runtime.

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  • How to add new object to an IList mapped as a one-to-many with NHibernate?

    - by Jørn Schou-Rode
    My model contains a class Section which has an ordered list of Statics that are part of this section. Leaving all the other properties out, the implementation of the model looks like this: public class Section { public virtual int Id { get; private set; } public virtual IList<Static> Statics { get; private set; } } public class Static { public virtual int Id { get; private set; } } In the database, the relationship is implemented as a one-to-many, where the table Static has a foreign key pointing to Section and an integer column Position to store its index position in the list it is part of. The mapping is done in Fluent NHibernate like this: public SectionMap() { Id(x => x.Id); HasMany(x => x.Statics).Cascade.All().LazyLoad() .AsList(x => x.WithColumn("Position")); } public StaticMap() { Id(x => x.Id); References(x => x.Section); } Now I am able to load existing Statics, and I am also able to update the details of those. However, I cannot seem to find a way to add new Statics to a Section, and have this change persisted to the database. I have tried several combinations of: mySection.Statics.Add(myStatic) session.Update(mySection) session.Save(myStatic) but the closest I have gotten (using the first two statements), is to an SQL exception reading: "Cannot insert the value NULL into column 'Position'". Clearly an INSERT is attempted here, but NHibernate does not seem to automatically append the index position to the SQL statement. What am I doing wrong? Am I missing something in my mappings? Do I need to expose the Position column as a property and assign a value to it myself? EDIT: Apparently everything works as expected, if I remove the NOT NULL constraint on the Static.Position column in the database. I guess NHibernate makes the insert and immediatly after updates the row with a Position value. While this is an anwers to the question, I am not sure if it is the best one. I would prefer the Position column to be not nullable, so I still hope there is some way to make NHibernate provide a value for that column directly in the INSERT statement. Thus, the question is still open. Any other solutions?

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  • Where can I find video and audio drivers for my netbook?

    - by Ari
    I got a little netbook yesterday (an Acer Aspire One) for schoolwork and read in numerous reviews Ubuntu was a must. I dove into it blindly and downloaded 12.04 LTS and though I admit it's faster than before, I have no idea how it works yet and was stupid enough to get rid of the Windows 7 Starter that was on there before completely. I can see myself getting used to the rest of Ubuntu, but the main issue is that it seems to have eaten all of my drivers and I don't know where to get any Ubuntu compatible ones. Any video at all is jilty and kind of creepy and any audio is very distorted and REALLY creepy. I understand that this is a tiny $150 typing and light web use school device I'm talking about, but I feel really stupid making the poor thing worse than it was before and not knowing what to do about it. Does anyone know how to install graphics/sound drivers? Or, alternatively, does anyone know where I can get a copy of Windows 7 Starter. I can see myself liking this if the problems are fixable, but if not I still have the product key and would be able to tackle the problem by myself with that.

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  • How Many Google +1's Does a Website need in order for Google WebMaster's Tools to Show Characteristics

    - by Asaph
    I have added the Google +1 Button to my website and discovered the new Social Activity section in Google WebMaster's Tools. Apparently, one of the interesting things you can learn about your audience is demographic data. But in GWT, the Social Activity Audience section for my site (currently 82 +1's), says the following: Your site doesn’t have enough +1's yet to show characteristics But I'm not sure how many +1's is enough. Google's official help page for the Audience section offers little insight: The Audience page displays information about people who have +1'd your pages, including the total number of unique users, their location, and their age and gender. All information is anonymized; Google doesn't share personal information about people who have +1’d your pages. To protect privacy, Google won't display age, gender, or location data unless a certain minimum number of people have +1'd your content. But what is that "certain minimum number"? I've tried Googling this but all I could find to date was this page which doesn't answer the question. So how many +1's does a site need before GWT will show me audience demographic characteristics?

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