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  • How to use second level cache for lazy loaded collections in Hibernate?

    - by Chandru
    Let's say I have two entities, Employee and Skill. Every employee has a set of skills. Now when I load the skills lazily through the Employee instances the cache is not used for skills in different instances of Employee. Let's Consider the following data set. Employee - 1 : Java, PHP Employee - 2 : Java, PHP When I load Employee - 2 after Employee - 1, I do not want hibernate to hit the database to get the skills and instead use the Skill instances already available in cache. Is this possible? If so how? Hibernate Configuration <session-factory> <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> <property name="hibernate.connection.password">pass</property> <property name="hibernate.connection.url">jdbc:mysql://localhost/cache</property> <property name="hibernate.connection.username">root</property> <property name="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</property> <property name="hibernate.cache.use_second_level_cache">true</property> <property name="hibernate.cache.use_query_cache">true</property> <property name="hibernate.cache.provider_class">net.sf.ehcache.hibernate.EhCacheProvider</property> <property name="hibernate.hbm2ddl.auto">update</property> <property name="hibernate.show_sql">true</property> <mapping class="org.cache.models.Employee" /> <mapping class="org.cache.models.Skill" /> </session-factory> The Entities with imports, getters and setters Removed @Entity @Table(name = "employee") @Cache(usage = CacheConcurrencyStrategy.READ_WRITE) public class Employee { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private int id; private String name; public Employee() { } @ManyToMany @JoinTable(name = "employee_skills", joinColumns = @JoinColumn(name = "employee_id"), inverseJoinColumns = @JoinColumn(name = "skill_id")) @Cache(usage = CacheConcurrencyStrategy.READ_WRITE) private List<Skill> skills; } @Entity @Table(name = "skill") @Cache(usage = CacheConcurrencyStrategy.READ_WRITE) public class Skill { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private int id; private String name; } SQL for Loading the Second Employee and his Skills Hibernate: select employee0_.id as id0_0_, employee0_.name as name0_0_ from employee employee0_ where employee0_.id=? Hibernate: select skills0_.employee_id as employee1_1_, skills0_.skill_id as skill2_1_, skill1_.id as id1_0_, skill1_.name as name1_0_ from employee_skills skills0_ left outer join skill skill1_ on skills0_.skill_id=skill1_.id where skills0_.employee_id=? In that I specifically want to avoid the second query as the first one is unavoidable anyway.

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  • Making Latex typeset given text on two facing pages

    - by Charles Stewart
    How do I encourage/make Latex typeset some portion of text so that it will all appear on a consecutive even-page, odd-page pair of pages? With trial and error, \nopagebreak can be coaxed into doing this, but is there a strategy that Just Works? Something like a samepage environment would be ideal, but one that: Will force a pagebreak on odd pages if that is needed to get all the text on facing pages; Allows up to one page break anywhere in the environment body, and fails noisily if that can't be ensured.

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  • I need some help with either my SQL or my PHP I do not know which...

    - by sico87
    Hello I am creating a CMS and some of the functionality of it that the images that are within the content are managable. I currently trying to display a table that shows the the content title and then the associated images, ideally I would like a layout similar to this, Content Title Image 1 Image 2 Image 3 Content Title 2 Image 1 Image 2 Content Title 3 Image 1 The SQL the returns the data is actually formed using Codeigniters Active Record class, function getAllContentImages() { $this->db->select('*'); $this->db->from('contentImagesTable'); $this->db->join('contentTable', 'contentTable.contentId = contentImagesTable.contentId'); $this->db->join('categoryTable', 'categoryTable.categoryId = contentTable.categoryId'); $query = $this->db->get(); return $query->result_array(); } The array that is returned is looks like this, I have cut the size down for readability. Array ( [0] => Array ( [contentImageId] => 25 [contentImageName] => green.png [contentImageType] => .png [contentImagePath] => /var/www/bangmarketing.bang/media/uploads/contentImages/2/green.png [isHeadlineImage] => 1 [contentImageDateUploaded] => 1265222654 [contentId] => 2 [dashboardUserId] => 0 [contentTitle] => sadsadsadassss [contentAbstract] => <p>Pllllleeeeeeeaaaaasssssseeeeee Work</p> [contentBody] => <p>Please work :-( please</p> [contentOnline] => 0 [contentAllowComments] => 0 [contentDateCreated] => 1265124038 [categoryId] => 1 [categoryTitle] => blogsss [categoryAbstract] => <p>asdsdsadasdsadfdsgdgdsgdsgssssssssssss</p> [categorySlug] => blog [categoryIsSpecial] => 0 [categoryOnline] => 1 [categoryDateCreated] => 1266588327 ) [1] => Array ( [contentImageId] => 28 [contentImageName] => yellow.png [contentImageType] => .png [contentImagePath] => /var/www/bangmarketing.bang/media/uploads/contentImages/7/yellow.png [isHeadlineImage] => 1 [contentImageDateUploaded] => 1265388055 [contentId] => 7 [dashboardUserId] => 0 [contentTitle] => Another Blog [contentAbstract] => <p>This is another blog and it is shit becuase this does not work</p> [contentBody] => <p>ioasfihfududfhdufhuishdfiudshfiudhsfiuhdsiufhusdhfuids</p> [contentOnline] => 1 [contentAllowComments] => 0 [contentDateCreated] => 1265388034 [categoryId] => 1 [categoryTitle] => blogsss [categoryAbstract] => <p>asdsdsadasdsadfdsgdgdsgdsgssssssssssss</p> [categorySlug] => blog [categoryIsSpecial] => 0 [categoryOnline] => 1 [categoryDateCreated] => 1266588327 ) [2] => Array ( [contentImageId] => 33 [contentImageName] => portaski.jpg [contentImageType] => .jpg [contentImagePath] => /var/www/bangmarketing.bang/media/uploads/contentImages/11/portaski.jpg [isHeadlineImage] => 1 [contentImageDateUploaded] => 1265714175 [contentId] => 11 [dashboardUserId] => 0 [contentTitle] => Portaski - new product and brand launch by Bang [contentAbstract] => <p>Bang's experience in new product development has helped launch PortaSki &ndash; the pocket-sized device which is set to revolutionise skiing.</p> [contentBody] => <p>After developing Portaski's brand identity and positioning, Bang re-designed the product and its packaging ahead of launch in late 2008.</p> <p>A media and PR strategy was devised and implemented using Bang's close relationship with two of the UK's most influential organisations in the Advertising and Media Buying industries. On-line advertising was supported with editorial reviews in the UK's leading broadsheets and tabloids, which combined with pin-point HTML direct mail to drive consumers to the new e-commerce site.</p> <p>Impressive month-on-month growth has been achieved since launch, and the direct marketing activity resulted in an unprecedented 2.71% of targets going on-line to purchase a PortaSki.</p> <p>For further information visit <a href="http://www.portaski.com" target="_blank">www.portaski.com</a></p> [contentOnline] => 1 [contentAllowComments] => 0 [contentDateCreated] => 1265718184 [categoryId] => 1 [categoryTitle] => blogsss [categoryAbstract] => <p>asdsdsadasdsadfdsgdgdsgdsgssssssssssss</p> [categorySlug] => blog [categoryIsSpecial] => 0 [categoryOnline] => 1 [categoryDateCreated] => 1266588327 ) [3] => Array ( [contentImageId] => 26 [contentImageName] => housingplus.jpg [contentImageType] => .jpg [contentImagePath] => /var/www/bangmarketing.bang/media/uploads/contentImages/5/housingplus.jpg [isHeadlineImage] => 1 [contentImageDateUploaded] => 1265284989 [contentId] => 5 [dashboardUserId] => 0 [contentTitle] => Bang launches Housing Plus [contentAbstract] => <p>Bang has launched Housing Plus, the new brand for the Central Borders Housing Group, along with new sub-brands Property Care and SSHA.</p> [contentBody] => <p>The Midlands based Group, with turnover in excess of &pound;21M, appointed Bang in 2008 following an open pitch of over 40 agencies. Bang's work began with an extensive marketing research strategy that challenged the Group's former positioning and brand structure.</p> <p>The research unveiled that the housing sector demanded a values-led Group. This led Bang to develop the brave &lsquo;Together for the Right Reasons' positioning for Housing Plus.</p> <p>Chris Garratt, Marketing Director at Bang explained "The housing sector has witnessed wholesale change in recent years. Much to tenant's dismay, many associations and Groups appear to be losing touch with their roots, we wanted to develop a Group for associations who place principles at the heart of their corporate strategy".</p> <p>The repositioned sub-brands also play an important role in the Group's revised brand by highlighting Housing Plus' willingness to embrace and nurture individual identities. Chris Garratt continued "By adopting a &lsquo;house of brands' hierarchy from the outset, Housing Plus has sent out a strong message to prospective strategic partners".</p> <p>Bang handled all aspects of work for the redevelopment of the three brands, including research, brand creation, naming, positioning, internal branding and communications, advertising, the brand launches, building the brands' on-line presence and the creation of a powerful brand film &ndash; which is already attracting significant interest from across the sector.</p> [contentOnline] => 1 [contentAllowComments] => 0 [contentDateCreated] => 1265285940 [categoryId] => 8 [categoryTitle] => News [categoryAbstract] => <p>The world at Bang Marketing moves fast, keep up to date w [categorySlug] => news [categoryIsSpecial] => 0 [categoryOnline] => 1 [categoryDateCreated] => 1265283717 ) I need a way that I can get all the content images associated with the same content title in one group and then display under the content title. Can anyone help?

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  • Why is an oracle sequence named hibernate_sequence being created with JPA using Hibernate with the O

    - by JavaRocky
    All my entities use this type of @Id @Id @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "MYENTITY_SEQ") @SequenceGenerator(name = "MYENTITY_SEQ", sequenceName = "MYENTITY_SEQ") @Column(name = "MYENTITY", nullable = false) private Long id; Or @Id @Column(name = "MYENTITY") I find that an oracle sequence named hibernate_sequence is always created. Why is this so? And how can i avoid this? I am using JPA1 with Hibernate 3 and the Oracle 10g dialect.

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  • Unit Testing: DateTime.Now

    - by Pedro
    I have some unit tests that expects the 'current time' to be different than DateTime.Now and I don't want to change the computer's time, obviously. What's the best strategy to achieve this? Thanks

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  • DLL Deployment Strategies

    - by Filip Ekberg
    If you have a modular applicaiton that depends on its modules to be in seperate libraries ( dlls ). What kind of Re-deployment strategy would be good to follow? The application is installed using the Setup Project that is available in Visual Studio. I would like to avoid the copy and paste approach!

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  • What is the best folder stucture in TFS for reporting service projects

    - by Dave
    Hi, I'm looking for some help on deciding a useful folder stucture strategy for reporting service projects in TFS. Does any one have some suggestions on which way I should stucture TFS? Should it be a project per report or should it be one Reporting project with multiple folders under the main that contain all the report projects? i.e. Senario 1 (separate projects for each report project) $ReportProject1 $ReportProject2 $ReportProject3 Senario 2 (Main report project in TFS and subfolders with report projects) $ReportingServices ------Src ---------Project1 -----------ReportProject1 files ---------Project2 -----------ReportProject2 files ---------Project3 -----------ReportProject3 files

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  • How to verify a jQuery plugin is compatible with latest version of jQuery?

    - by jedatu
    Are there any tools that can verify whether a jQuery plugin will be compatible with the latest version of jQuery? Once a large number of jQuery plugins are selected and in use, an unknown number of dependencies can develop. It would be nice to upgrade jQuery, however not all plugins remain supported or provide consistently architected upgrades. The only option seems to be adhoc manual regression testing. It would be nice to have a strategy for dealing with this issue.

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  • Quantum PSO and Charged PSO (PSO = Particle Swarm Optimizer)

    - by The Elite Gentleman
    Hi Guys I need to implement PSO's (namely charged and quantum PSO's). My questions are these: What Velocity Update strategy do each PSO's use (Synchronous or Asynchronous particle update) What social networking topology does each of the PSO's use (Von Neumann, Ring, Star, Wheel, Pyramid, Four Clusters) For now, these are my issues. All your help will be appreciated. Thanks.

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  • Do you prefer a Grid of ContentControl elements?

    - by rasx
    Today I am led to say for the greatest level of flexibility using a Grid of ContentControl elements is the way to go. Are there any caveats coming for choosing this strategy? (Note that, of course, I am not referring to the DataGrid or the GridView of a ListView.)

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  • Execption Error in c#

    - by Kumu
    using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.IO; using System.Runtime.Serialization.Formatters.Binary; namespace FoolballLeague { public partial class MainMenu : Form { FootballLeagueDatabase footballLeagueDatabase; Game game; Login login; public MainMenu() { InitializeComponent(); changePanel(1); } public MainMenu(FootballLeagueDatabase footballLeagueDatabaseIn) { InitializeComponent(); footballLeagueDatabase = footballLeagueDatabaseIn; } private void Form_Loaded(object sender, EventArgs e) { } private void gameButton_Click(object sender, EventArgs e) { int option = 0; changePanel(option); } private void scoreboardButton_Click(object sender, EventArgs e) { int option = 1; changePanel(option); } private void changePanel(int optionIn) { gamePanel.Hide(); scoreboardPanel.Hide(); string title = "Football League System"; switch (optionIn) { case 0: gamePanel.Show(); this.Text = title + " - Game Menu"; break; case 1: scoreboardPanel.Show(); this.Text = title + " - Display Menu"; break; } } private void logoutButton_Click(object sender, EventArgs e) { login = new Login(); login.Show(); this.Hide(); } private void addGameButton_Click(object sender, EventArgs e) { if ((homeTeamTxt.Text.Length) == 0) MessageBox.Show("You must enter a Home Team"); else if (homeScoreUpDown.Value > 9 || homeScoreUpDown.Minimum < 0) MessageBox.Show("You must enter one digit between 0 and 9"); else if ((awayTeamTxt.Text.Length) == 0) MessageBox.Show("You must enter a Away Team"); else if (homeScoreUpDown.Value > 9 || homeScoreUpDown.Value < 0) MessageBox.Show("You must enter one digit between 0 to 9"); else { //checkGameInputFields(); game = new Game(homeTeamTxt.Text, int.Parse(homeScoreUpDown.Value.ToString()), awayTeamTxt.Text, int.Parse(awayScoreUpDown.Value.ToString())); MessageBox.Show("Home Team -" + '\t' + homeTeamTxt.Text + '\t' + "and" + '\r' + "Away Team -" + '\t' + awayTeamTxt.Text + '\t' + "created"); footballLeagueDatabase.AddGame(game); //clearCreateStudentInputFields(); } } private void timer1_Tick(object sender, EventArgs e) { displayDateAndTime(); } private void displayDateAndTime() { dateLabel.Text = DateTime.Today.ToLongDateString(); timeLabel.Text = DateTime.Now.ToShortTimeString(); } private void displayResultsButton_Click(object sender, EventArgs e) { Game game = new Game(homeTeamTxt.Text, int.Parse(homeScoreUpDown.Value.ToString()), awayTeamTxt.Text, int.Parse(awayScoreUpDown.Value.ToString())); gameResultsListView.Items.Clear(); gameResultsListView.View = View.Details; ListViewItem row = new ListViewItem(); row.SubItems.Add(game.HomeTeam.ToString()); row.SubItems.Add(game.HomeScore.ToString()); row.SubItems.Add(game.AwayTeam.ToString()); row.SubItems.Add(game.AwayScore.ToString()); gameResultsListView.Items.Add(row); } private void displayGamesButton_Click(object sender, EventArgs e) { Game game = new Game("Home", 2, "Away", 4);//homeTeamTxt.Text, int.Parse(homeScoreUpDown.Value.ToString()), awayTeamTxt.Text, int.Parse(awayScoreUpDown.Value.ToString())); modifyGamesListView.Items.Clear(); modifyGamesListView.View = View.Details; ListViewItem row = new ListViewItem(); row.SubItems.Add(game.HomeTeam.ToString()); row.SubItems.Add(game.HomeScore.ToString()); row.SubItems.Add(game.AwayTeam.ToString()); row.SubItems.Add(game.AwayScore.ToString()); modifyGamesListView.Items.Add(row); } } } This is the whole code and I got same error like previous question. Unhandled Execption has occuredin you application.If you click...............click Quit.the application will close immediately. Object reference not set to an instance of an object. And the following details are in the error message. See the end of this message for details on invoking just-in-time (JIT) debugging instead of this dialog box. ***** Exception Text ******* System.NullReferenceException: Object reference not set to an instance of an object. at FoolballLeague.MainMenu.addGameButton_Click(Object sender, EventArgs e) in C:\Users\achini\Desktop\FootballLeague\FootballLeague\MainMenu.cs:line 91 at System.Windows.Forms.Control.OnClick(EventArgs e) at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ButtonBase.WndProc(Message& m) at System.Windows.Forms.Button.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) ***** Loaded Assemblies ******* mscorlib Assembly Version: 2.0.0.0 Win32 Version: 2.0.50727.4927 (NetFXspW7.050727-4900) CodeBase: file:///C:/Windows/Microsoft.NET/Framework64/v2.0.50727/mscorlib.dll ---------------------------------------- FootballLeague Assembly Version: 1.0.0.0 Win32 Version: 1.0.0.0 CodeBase: file:///C:/Users/achini/Desktop/FootballLeague/FootballLeague/bin/Debug/FootballLeague.exe ---------------------------------------- System.Windows.Forms Assembly Version: 2.0.0.0 Win32 Version: 2.0.50727.4927 (NetFXspW7.050727-4900) CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll ---------------------------------------- System Assembly Version: 2.0.0.0 Win32 Version: 2.0.50727.4927 (NetFXspW7.050727-4900) CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll ---------------------------------------- System.Drawing Assembly Version: 2.0.0.0 Win32 Version: 2.0.50727.4927 (NetFXspW7.050727-4900) CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll ---------------------------------------- System.Configuration Assembly Version: 2.0.0.0 Win32 Version: 2.0.50727.4927 (NetFXspW7.050727-4900) CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Configuration/2.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll ---------------------------------------- System.Xml Assembly Version: 2.0.0.0 Win32 Version: 2.0.50727.4927 (NetFXspW7.050727-4900) CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll ***** JIT Debugging ******* To enable just-in-time (JIT) debugging, the .config file for this application or computer (machine.config) must have the jitDebugging value set in the system.windows.forms section. The application must also be compiled with debugging enabled. For example: When JIT debugging is enabled, any unhandled exception will be sent to the JIT debugger registered on the computer rather than be handled by this dialog box. I need to add the games to using the addGameButton and the save those added games and display them in the list view (gameResultsListView). Now I can added a game and display in the list view.But when I pressed the button addGameButton I got the above error message. If you can please give me a solution to this problem.

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  • Simulating graphing paper on iPhone

    - by Rick
    I need to implement 'graphing paper' in an iPhone app. The user should be presented with a grid. They user can touch individual squares to turn them on, or if they're already on, off.The user can pinch to zoom and scroll around the paper as well.. So far I'm thinking Quartz 2D + UIScrollView is the way to do this but these are both areas of iPhone development that I'm unfamiliar with. Does this seem like a reasonable strategy?

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  • Hibernate-Search: How to search dates?

    - by Aaron
    @Entity @Table(name = "USERS") public class User { @Id @GeneratedValue(strategy = GenerationType.AUTO) private long id; @Column(name = "USERNAME", nullable = false, length = 20) private String userName; @Column(name = "PASSWORD", nullable = false, length = 10) private String password; @Column(name = "Date", nullable = false ) private Date date; } How can I select the records which have the date between [now | now-x hours] [now | now-x days] [now | now-x months] [now | now-x years]

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  • Cannot instantiate abstract class or interface : problem while persisting

    - by sammy
    i have a class campaign that maintains a list of AdGroupInterfaces. im going to persist its implementation @Entity @Table(name = "campaigns") public class Campaign implements Serializable,Comparable<Object>,CampaignInterface { private static final long serialVersionUID = 1L; @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; @OneToMany ( cascade = {CascadeType.ALL}, fetch = FetchType.EAGER, targetEntity=AdGroupInterface.class ) @org.hibernate.annotations.Cascade( value = org.hibernate.annotations.CascadeType.DELETE_ORPHAN ) @org.hibernate.annotations.IndexColumn(name = "CHOICE_POSITION") private List<AdGroupInterface> AdGroup; public Campaign() { super(); } public List<AdGroupInterface> getAdGroup() { return AdGroup; } public void setAdGroup(List<AdGroupInterface> adGroup) { AdGroup = adGroup; } public void set1AdGroup(AdGroupInterface adGroup) { if(AdGroup==null) AdGroup=new LinkedList<AdGroupInterface>(); AdGroup.add(adGroup); } } AdGroupInterface's implementation is AdGroups. when i add an adgroup to the list in campaign, campaign c; c.getAdGroupList().add(new AdGroups()), etc and save campaign it says"Cannot instantiate abstract class or interface :" AdGroupInterface its not recognizing the implementation just before persisting... Whereas Persisting adGroups separately works. when it is a member of another entity, it doesnt get persisted. import java.io.Serializable; import java.util.List; import javax.persistence.*; @Entity @DiscriminatorValue("1") @Table(name = "AdGroups") public class AdGroups implements Serializable,Comparable,AdGroupInterface{ /** * */ private static final long serialVersionUID = 1L; private Long Id; private String Name; private CampaignInterface Campaign; private MonetaryValue DefaultBid; public AdGroups(){ super(); } public AdGroups( String name, CampaignInterface campaign) { super(); this.Campaign=new Campaign(); Name = name; this.Campaign = campaign; DefaultBid = defaultBid; AdList=adList; } @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Column(name="AdGroup_Id") public Long getId() { return Id; } public void setId(Long id) { Id = id; } @Column(name="AdGroup_Name") public String getName() { return Name; } public void setName(String name) { Name = name; } @ManyToOne @JoinColumn (name="Cam_ID", nullable = true,insertable = false) public CampaignInterface getCampaign() { return Campaign; } public void setCampaign(CampaignInterface campaign) { this.Campaign = campaign; } } what am i missing?? please look into it ...

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  • How to not write the full url in javascript ?

    - by Axel
    Hi, I did a Mod rewrite for my website so the URLs looks like this : http://www.mydomain.com/health/54856 http://www.mydomain.com/economy/strategy/911025/ http://www.mydomain.com/tags/obama/new So, the problem is that i make AJAX calls to a file here : http://www.mydomain.com/login.php And i don't want to write the FULL url or even use ../ trick because there isn't a fixed number of folders. So, what i want now, is something worked for my code to access the login.php from the root whatever the domain name is : $.ajax({ type: "POST", url: "http://www.mydomain.com/login.php" });

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  • derby + hibernate ConstraintViolationException using manytomany relationships

    - by user364470
    Hi, I'm new to Hibernate+Derby... I've seen this issue mentioned throughout the google, but have not seen a proper resolution. This following code works fine with mysql, but when I try this on derby i get exceptions: ( each Tag has two sets of files and vise-versa - manytomany) Tags.java @Entity @Table(name="TAGS") public class Tags implements Serializable { @Id @GeneratedValue(strategy=GenerationType.AUTO) public long getId() { return id; } @ManyToMany(targetEntity=Files.class ) @ForeignKey(name="USER_TAGS_FILES",inverseName="USER_FILES_TAGS") @JoinTable(name="USERTAGS_FILES", joinColumns=@JoinColumn(name="TAGS_ID"), inverseJoinColumns=@JoinColumn(name="FILES_ID")) public Set<data.Files> getUserFiles() { return userFiles; } @ManyToMany(mappedBy="autoTags", targetEntity=data.Files.class) public Set<data.Files> getAutoFiles() { return autoFiles; } Files.java @Entity @Table(name="FILES") public class Files implements Serializable { @Id @GeneratedValue(strategy=GenerationType.AUTO) public long getId() { return id; } @ManyToMany(mappedBy="userFiles", targetEntity=data.Tags.class) public Set getUserTags() { return userTags; } @ManyToMany(targetEntity=Tags.class ) @ForeignKey(name="AUTO_FILES_TAGS",inverseName="AUTO_TAGS_FILES") @JoinTable(name="AUTOTAGS_FILES", joinColumns=@JoinColumn(name="FILES_ID"), inverseJoinColumns=@JoinColumn(name="TAGS_ID")) public Set getAutoTags() { return autoTags; } I add some data to the DB, but when running over Derby these exception turn up (the don't using mysql) Exceptions SEVERE: DELETE on table 'FILES' caused a violation of foreign key constraint 'USER_FILES_TAGS' for key (3). The statement has been rolled back. Jun 10, 2010 9:49:52 AM org.hibernate.event.def.AbstractFlushingEventListener performExecutions SEVERE: Could not synchronize database state with session org.hibernate.exception.ConstraintViolationException: could not delete: [data.Files#3] at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:96) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2712) at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2895) at org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:97) at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:268) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:260) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:184) at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321) at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51) at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1206) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:613) at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:344) at $Proxy13.flush(Unknown Source) at data.HibernateORM.removeFile(HibernateORM.java:285) at data.DataImp.removeFile(DataImp.java:195) at booting.DemoBootForTestUntilTestClassesExist.main(DemoBootForTestUntilTestClassesExist.java:62) I have never used derby before so maybe there is something crutal that i'm missing 1) what am I doing wrong? 2) is there any way of cascading properly when I have 2 many-to-many relationships between two classes? Thanks!

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  • How to tile a 30000 x 6000 image for a 480 x 320 screen?

    - by Horace Ho
    (this is related to another question about implementation on iPhone) I have a large image, size around 30000 (w) x 6000 (h) pixels. You may consider it's like a big map. I assume I need to crop it up into smaller tiles. Questions: what is the tile strategy? Requirements: whole image (though cropped) can be scrolled up/down/left/right by swipes zoom in (up to pixel-to-pixel) out (down to screen-fit-by-height) by the 2-finger operation memory efficiency by lazy loading tiles Thanks!

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  • Tool that shows unit dependencies for Delphi 2010 or Delphi 7 program

    - by Tom1952
    We're trying to untangle a hairball of 100's of units, removing some. It would be helpful if there was tool that would show us what units were explicitly using unit X. Penganza doesn't seem to have a report that does that. (Although it has lots of other useful reports.) Can anyone suggest a tool or strategy for doing this, other than just hiding unit x and then hitting F9 ... repeatedly?

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  • generic programming in C with void pointer.

    - by Nyan
    Hi everyone, even though it is possible to write generic code in C using void pointer(generic pointer), I find that it is quite difficult to debug the code since void pointer can take any pointer type without warning from compiler. (e.g function foo() take void pointer which is supposed to be pointer to struct, but compiler won't complain if char array is passed.) What kind of approach/strategy do you all use when using void pointer in C?

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  • Increase efficiency for an R simulator of the Monty Hall Puzzle

    - by jahan_m
    The Monty Hall Problem is a simple puzzle involving probability that even stumps professionals in careers dealing with some heavy-duty math. Here's the basic problem: Suppose you're on a game show, and you're given the choice of three doors: Behind one door is a car; behind the others, goats. You pick a door, say No. 1, and the host, who knows what's behind the doors, opens another door, say No. 3, which has a goat. He then says to you, "Do you want to pick door No. 2?" Is it to your advantage to switch your choice? You can find numerous explanations of the solution here: http://en.wikipedia.org/wiki/Monty_Hall_problem Goal of my simulation: Prove that a switching strategy will win you the car 2/3 of the time. I got curious and wanted to write a little function that simulates the problem many times and returns the proportion of wins if you switched and the proportion of wins if you stayed with your first choice. The function then plots the cumulative wins. First and foremost, I'm interested in hearing if my simulation is indeed replicating the Monty Problem, or if some aspect of the code got it wrong. Secondly, this function takes a long time to run once I get to about 10,000 simulations. I know I don't need this many simulations to prove this but I'd love to hear some ideas on how to make it more efficient. Thanks for your feedback! Monty_Hall=function(repetitions){ doors=c('A','B','C') stay_wins=0 switch_wins=0 series=data.frame(sim_num=seq(repetitions),cum_sum_stay=replicate(repetitions,0),cum_sum_switch=replicate(repetitions,0)) for(i in seq(repetitions)){ winning_door=sample(doors,1) contestant_chooses=sample(doors,1) if(contestant_chooses==winning_door) stay_wins=stay_wins+1 else switch_wins=switch_wins+1 series[i,'cum_sum_stay']=stay_wins series[i,'cum_sum_switch']=switch_wins } plot(series$sim_num,series$cum_sum_switch,col=2,ylab='Cumulative # of wins', xlab='Simulation #',main=sprintf('%d Simulations of the Monty Hall Paradox',repetitions),type='l') lines(series$sim_num,series$cum_sum_stay,col=4) legend('topleft',legend=c('Cumulative wins from switching', 'Cumulative wins from staying'),col=c(2,4),lty=1) result=list(series=series,stay_wins=stay_wins,switch_wins=switch_wins, proportion_stay_wins=stay_wins/repetitions, proportion_switch_wins=switch_wins/repetitions) return(result) } #Theory predicts that it is to the contestant's advantage if he #switches his choice to the other door. This function simulates the game #many times, and shows you the proportion of games in which staying or #switching would win the car. It also plots the cumulative wins for each strategy. Monty_Hall(100)

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