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• Drawing star shapes with variable parameters

  - by owca

  Hi. I have task to write program allowing users to draw stars, which can differ in size and amount of arms. When I was dealing with basic stars I was doing it with GeneralPath and tables of points : int xPoints[] = { 55, 67, 109, 73, 83, 55, 27, 37, 1, 43 }; int yPoints[] = { 0, 36, 36, 54, 96, 72, 96, 54, 36, 36 }; Graphics2D g2d = ( Graphics2D ) g; GeneralPath star = new GeneralPath(); star.moveTo( xPoints[ 0 ], yPoints[ 0 ] ); for ( int k = 1; k < xPoints.length; k++ ) star.lineTo( xPoints[ k ], yPoints[ k ] ); star.closePath(); g2d.fill( star ); What method should I choose for drawing stars with variable inner and outer radius, as well as different amount of arms ? This is what I should obtain :

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• DataAdapter Select string from base table schema?

  - by MattSlay

  When I built my .xsd, I had to choose the columns for each table, and it made a schema for the tables, right? So how can I get that Select string to use as a base Select command for new instances of dataadapters, and then just append a Where and OrderBy clause to it as needed? That would keep me from having to keep each DataAdapter's field list (for the same table) in synch with the schema of that table in the .xsd file. Isn't it common to have several DataAdapters that work on a certain table schema, but with different params in the Where and OrderBy clauses? Surely one does not have to maintain (or even redundently build) the field list part of the Select strings for half a dozen DataAdapters that all work off of the same table schema. I'm envisioning something like this pseudo code: BaseSelectString = MyTypedDataSet.JobsTable.GetSelectStringFromSchema() // Is there such a method or technique? WhereClause = " Where SomeField = @Param1 and SomeOtherField = @Param2" OrderByClause = " Order By Field1, Field2" SelectString=BaseSelectString + WhereClause + OrderByClause OleDbDataAdapter adapter = new OleDbDataAdapter(SelectString, MyConn)

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• Problem with HSQLDB & SequenceGenerator

  - by Srirangan

  Hi, I have an entity which has an ID field: @Id @Column(name = "`U##ID_VOIE`") @GeneratedValue(generator = "VOIE_SEQ") private String id; The class has the sequence generator defined as well: @SequenceGenerator(name = "VOIE_SEQ", sequenceName = "VOIE_SEQ") and the Oracle schema has the requisite sequence present. Everything works okay. We also have tests, which uses an in-memory HSQLDB. Before running the tests, all the tables are created based on the Hibernate entity classes. However the table for this particular class is not being created. And error pops up, because ID is a String and the SequenceGenerator in HSQLDB returns an INT / LONG / Numeric value. The application is using a legacy Oracle database and ID_VOIE column must remain a String / Varchar. Any solutions?

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• Saving data to server with user accounts.

  - by AKRamkumar

  Ok, so for an app I am making, I want the user to be able to save data online. On my website, I will provide a web server with tables of UserName/Password/SaveData. How can I do this without crashing the server load? How can I guarantee security ? Is there a Design Pattern for this?Is there a better way of doing this? This is going to be a free application, available to the public and I would like for their settings to be available, no matter the computer they are using. Is there a better way of doing this? I am using MEF for plugins so is there a way I can save plugin data as well?

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• C# Threading vs single thread

  - by user177883

  Is it always guaranteed that a multi-threaded application would run faster than a single threaded application? I have two threads that populates data from a data source but different entities (eg: database, from two different tables), seems like single threaded version of the application is running faster than the version with two threads. Why would the reason be? when i look at the performance monitor, both cpu s are very spikey ? is this due to context switching? what are the best practices to jack the CPU and fully utilize it? I hope this is not ambiguous.

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• mySQL one-to-many query

  - by Stomped

  I've got 3 tables that are something like this (simplified here ofc): users user_id user_name info info_id user_id rate contacts contact_id user_id contact_data users has a one-to-one relationship with info, although info doesn't always have a related entry. users has a one-to-many relationship with contacts, although contacts doesn't always have related entries. I know I can grab the proper 'users' + 'info' with a left join, is there a way to get all the data I want at once? For example, one returned record might be: user_id: 5 user_name: tom info_id: 1 rate: 25.00 contact_id: 7 contact_data: 555-1212 contact_id: 8 contact_data: 555-1315 contact_id: 9 contact_data: 555-5511 Is this possible with a single query? Or must I use multiple?

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• What is wrong with this database query?

  - by outsyncof

  I have the following tables in a database (i'll only list the important attributes): Person(ssn,countryofbirth) Parents(ssn,fatherbirthcountry) Employment(ssn, companyID) Company(companyID, name) My task is this: given fatherbirthcountry as input, output the names of companies where persons work whose countryofbirth match the fatherbirthcountry input. I pretend that the fatherbirthcountry is Mexico and do this: SELECT name FROM Company WHERE companyid = (SELECT companyid FROM Employment WHERE ssn = (SELECT ssn FROM Person WHERE countryofbirth = 'Mexico'); but it is giving me an error: >Scalar subquery is only allowed to return a single row. am I completely off track? Can anybody please help?

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• Hibernate generate POJOs with Equals

  - by jschoen

  We are using hibernate in a new project where we use the hibernate.reveng.xml to create our *.hbm.xml files and POJOs after that. We want to have equals methods in each of our POJOs. I found that you can use <meta attribute="use-in-equals">true</meta> in your hbm files to mark which properties to use in the equals. But this would mean editing alot of files, and then re-editing the files again in the future if/when we modify tables or columns in our DB. So I was wondering if there is a way to place which properties to use in the equals method for each pojo(table) in the hibernate.reveng.xml file?

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• A way to avoid deriving from the provider classes in mvc authentication

  - by Shymep

  Looking for the best practice for authentication in MVC I unfortunately didn't find the clear answer to my question. Thinking of the problem I tried to imagine some priciples that could be useful in my design. Well, I would like to use a base AccountController class I want to place all the tables such as "Users", Roles, Rights etc into my own database. But I wouldn't like to implement the standard aspnetdb design (which can be easy got by using aspnet_regsql) So the main question is can I do this without deriving abstract classes like MembershipProvider, RoleProvider etc? What I would prefer not to do is implement all the abstract methods from these classes. The second question is still about the best practice for authentication e.g. for the small projects, for the large ones?

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• Doubts in System call mechanism in linux

  - by bala1486

  We transit from ring3 to ring0 using 'int' or the new 'syscall/sysenter' instruction. Does that mean that the page tables and other stuffs that needs to be modified for the kernel is automatically done by the 'int' instruction or the interrupt handler for the 'int 0x80' will do the required stuff and jump to the respective system call. Also when returning from a system call, we again need to go to user space. For this we need to know the instruction address in the user space to continue the user application. Where is that address stored. Does the 'ret' instruction automatically changes the ring from ring3 to ring0 or where/how this ring changing mechanism takes place? Then, i read that changing from ring3 to ring0 is not as costly as changing from ring0 to ring3. Why is this so?? Thanks, Bala

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• How to rollback a database deployment without losing new data?

  - by devlife

  My company uses virtual machines for our web/app servers. This allows for very easy rollbacks of a deployment if something goes wrong. However, if an app server deployment also requires a database deployment and we have to rollback I'm kind of at a loss. How can you rollback database schema changes without losing data? The only thing that I can think of is to write a script that will drop/revert tables/columns back to their original state. Is this really the best way?

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• Hibernate and stored procedures

  - by cc96ai

  As my understanding on setting hibernate, I need to create table meta data file (person.hbm.xml), include all the fields mapping java object (person.java) If we use stored procedures for all transaction, do we still need the above configuration? It seems hibernate and stored procedures will overlap, We set up the stored procedure because we don't want the to developer know all the field in db. If tables change, then we need update above files. Does it mean if we purely use stored procedure, we should just go for JDBC? If hibernate, we should stay in HQL?

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• Changing content of HTMLDocument displayed in a JTextPane

  - by kayahr

  I'm displaying some tables as HTML code (rendered by a Freemarker template) with a JTextPane. I also have some HTML links in this HTML output which can be used to interact with the values of the table (For example "Delete a row" and stuff like this). Currently I always recreate the whole HTML output on each change and replace the whole document in the JTextPane with the new one. This is getting really slow and the JTextPane always changes the scroll position when I do this. Is it possible to change only parts of the HTML code during runtime without replacing the whole document? In a real browser I would use the DOM and do something like document.getElementById("price").innerHTML = "$123.44". Is something like that possible with the HTMLDocument in a JTextPane?

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• Good piece of software that can manage the creation of complex web forms, including reporting, etc?

  - by Callum

  I have some clients who are requesting for some of their reasonably complex paper-based forms to be converted in to web forms. There's straight Q&A text input stuff, there's questions based around checkboxes, radio boxes, select boxes, maybe the occasional attached image, there's data that has to be entered in a tabular fashion, etc. I am deciding whether I should build a "platform" with properly normalised tables to store all types of form data. But before that, I thought I had better check and see if there is anything like that already on the market. I am looking for a product that can: * Easily create web forms of all types * Store all data in a database * Extensive reporting capability I have had a bit of a look around but there's not a whole lot I can see. Does anyone have any suggestions? Thanks.

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• Help with SQL query (list strings and count in same query)

  - by Mestika

  Hi everybody, I’m working on a small kind of log system to a webpage, and I’m having some difficulties with a query I want to do multiple things. I have tried to do some nested / subqueries but can’t seem to get it right. I’ve two tables: User = {userid: int, username} Registered = {userid: int, favoriteid: int} What I need is a query to list all the userid’s and the usernames of each user. In addition, I also need to count the total number of favoriteid’s the user is registered with. A user who is not registered for any favorite must also be listed, but with the favorite count shown as zero. I hope that I have explained my request probably but otherwise please write back so I can elaborate. By the way, the query I’ve tried with look like this: SELECT user.userid, user.username FROM user,registered WHERE user.userid = registered.userid(SELECT COUNT(favoriteid) FROM registered) However, it doesn’t do the trick, unfortunately Kind regards Mestika

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• what can cause a folder to become indestructible?

  - by JustJeff

  I have a directory that I want to delete, but windows (xp sp3) is giving me the run-around and the folder is now effectively indestructible. Attempts to open the folder, either via explorer or cmd.exe are met with 'd:/temp/foo Is Not Accessible. Access is denied'. Attempts to delete the folder result in 'Cannot delete foo: The directory is not empty' So I can't delete it because supposedly it's not empty, but windows won't let me in it for some reason, so I can't clean it out first. There's nothing in it of consequence, and basically I just want to delete it at this point. Thinking that some other process must have a lock on it, I used the SysInternals 'handles' and Process Explorer to look for open handles with the directory name. These turned up no matches. (The directory name is not actually 'foo', it is something more unique but 'foo' is easier to type here). I put the machine through a restart, and the problem persists. I did a search for the folder name with regedit, to see what other apps might be aware of it. No match. The properties dialog was mildly interesting. The Read-Only attribute is 'semi-checked', i.e., the grayish check mark you get when some parts are and some parts aren't. Naturally I immediately unchecked this, and tried to delete the folder. No go. Opening properties again reveals the gray check mark next to Read-Only has returned. All the stats, size, size on disk, files, folders, all these are zero. There do not appear to be any shares on the folder, so that's not it either. Finally, I tried opening the partition's properties, and running the Tools/Error Checking utility. This didn't turn up any problems either. Fwiw, this directory was created by [a popular gui zip tool] when I tried to unpack a tar-and-zipped archive created on another system with command line utils. The archive was definitely corrupt, but I've never seen such a file do anything worse than crash the zip app, and certainly never leave permanent glitches in the file system. So what else can possibly be going on to make this folder behave this way?

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• How to assign default values and define unique keys in Entity Framework 4 Designer

  - by csharpnoob

  Hello, I've had a look at the Entity Framework 4. While generating code for the SQL Server 2008 I came to the point where I want to define some default values for some fields. how to define in the designer for a Created DateTime Field the DateTime.Now default value? - Error 54: Default value (DateTime.Now) is not valid for DateTime. The value must be in the form 'yyyy-MM-dd HH:mm:ss.fffZ' how to make for code generation a string Field unique. Like E-Mail or Username can exists only once in the table. I've search alot in the internet and also checked my books Pro Entity Framework 4.0 and Programming Entity Framework. But none of them seems to come up with the default value issue, or using sql commands as default values for database generation. Another thing is, how to prevent on database generation always from droping tables? Instead i want to append non existing fields and keep the data. Thanks for any suggestions.

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• Globalize2 and migrations

  - by diegogs

  Hi, I have used globalize2 to add i18n to an old site. There is already a lot of content in spanish, however it isn't stored in globalize2 tables. Is there a way to convert this content to globalize2 with a migration in rails? The problem is I can't access the stored content: >> Panel.first => #<Panel id: 1, name: "RT", description: "asd", proje.... >> Panel.first.name => nil >> I18n.locale = nil => nil >> Panel.first.name => nil Any ideas?

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• Thoughts/Input about Database Design for a CMS

  - by dallasclark

  I'm just about to expand the functionality of our own CMS but was thinking of restructuring the database to make it simpler to add/edit data types and values. Currently, the CMS is quite flat - the CMS requires a field in the database for every type of stored value (manually created). The first option that comes to mind is simply a table which keeps the data types (ie: Address 1, Suburb, Email Address etc) and another table which holds values for each of these data types. Just like how Wordpress keeps values in the 'options' table, PHP serialize would be used to store an array of values. The second option is how Drupal works, the CMS creates tables for every data type. Unlike Wordpress, this can be a bit of an overkill but really useful for SQL queries when ordering and grouping by a particular value. What's everyone's thoughts?

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• C# SqlDataAdapter not populating DataSet

  - by Wesley

  I have searched the net and searched the net only to not quite find the probably I am running into. I am currently having an issue getting a SqlDataAdapter to populate a DataSet. I am running Visual Studio 2008 and the query is being sent to a local instance of SqlServer 2008. If I run the query itself in SqlServer, I do get information. Code is as follows: string theQuery = "select Password from Employees where employee_ID = '@EmplID'"; SqlDataAdapter theDataAdapter = new SqlDataAdapter(); theDataAdapter.SelectCommand = new SqlCommand(theQuery, conn); theDataAdapter.SelectCommand.Parameters.Add("@EmplID", SqlDbType.VarChar).Value = "EmployeeName"; theDataAdapter.Fill(theSet); The code to read the dataset: foreach (DataRow theRow in theSet.Tables[0].Rows) { //process row info } If there is any more info I can supply please let me know.

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• Call server side method from JSON

  - by Zerotoinfinite

  How to call a method on a server side from JSON. Below is the code I am using SERVER SIDE: [WebMethod] private void GetCustomer( string NoOfRecords) { string connString = "Data Source=Something;Initial Catalog=AdventureWorks;Trusted_Connection=True;"; SqlConnection sCon = new SqlConnection(connString); SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM Sales.Customer WHERE CustomerID < '" + NoOfRecords+ "' ", sCon); DataSet ds = new DataSet(); da.Fill(ds); GvDetails.DataSource = ds.Tables[0]; GvDetails.DataBind(); } On Client Side: var txtID = document.getElementById('txtValue'); $.ajax({ type: "POST", url: "Default.aspx/GetCustomer", data: "{Seconds:'" + txtID +"'}", contentType: "application/json; charset=utf-8", dataType: "json", success: function(response) { alert(response); } }); Now I want that on button click, I would call the function at the client side [JSON], which pass the textbox value to the function. Please help

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• How to clean sys.conversation_endpoints

  - by Manjoor

  I have a table, a trigger on the table implemented using service broker. More than Half million records are inserted daily into the table. The asynchronous SP is used to check sveral condition by using inserted data and update other tables. It was running fine for last 1 month and the SP was get executed withing 2-3 seconds of insertion of record. But now it take more than 90 minute. At present sys.conversation_endpoints have too much records. (Note that all the table are truncated daily as I do not need those records day after) Other database activities are normal (average 60% CPU Utilization). Now where i need to look?? I can re-create database without any problem but i don't think it is a good way to resolve the problem

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• Mysql eliminate user based on conditions

  - by Dustin

  I asked this last week over the weekend and it got buried in the archives before anyone could answer. So forgive me if you've already seen this. I teach classes and want to be able to select those students who have taken one class, but not another class. I have two tables: lessons_slots which is the table for every class such as: -------------------- -ID name slots- -1 basics 10 - -2 advanced 10 - -3 basics 10 - --------------------- The other table is class_roll, which holds enrollment info, such as: -------------------- -sID classid firstname lastname- -1 1 Jo Schmo -2 1 Person Two ... -13 2 Jo Schmo --------------------- What I want to do, I select everyone who has not had the advanced class (for example). I've tried doing SELECT * FROM lessons_slots LEFT JOIN class_roll ON lessons_slots.ID = class_roll.classid WHERE lessons_slots.name != 'advanced' But that doesn't work...All it does is eliminate that row, without eliminating the user. I want Jo Schmo, for example, to not show up in the results. Any ideas?

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• Modifying records in my migration throws an authlogic error

  - by nfm

  I'm adding some columns to one of my database tables, and then populating those columns: def self.up add_column :contacts, :business_id, :integer add_column :contacts, :business_type, :string Contact.reset_column_information Contact.all.each do |contact| contact.update_attributes(:business_id => contact.client_id, :business_type => 'Client') end remove_column :contacts, :client_id end The line contact.update_attributes is causing the following Authlogic error: You must activate the Authlogic::Session::Base.controller with a controller object before creating objects I have no idea what is going on here - I'm not using a controller method to modify each row in the table. Nor am I creating new objects. The error doesn't occur if the contacts table is empty. I've had a google and it seems like this error can occur when you run your controller tests, and is fixed by adding before_filter :activate_authlogic to them, but this doesn't seem relevant in my case. Any ideas? I'm stumped.

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• A database of questions with unambiguous numeric answers.

  - by dreeves

  I (and co-hackers) are building a sort of trivia game inspired by this blog post: http://messymatters.com/calibration. The idea is to give confidence intervals and learn how to be calibrated (when you're "90% sure" you should be right 90% of the time). We're thus looking for, ideally, thousands of questions with unambiguous numerical answers. Also, they shouldn't be too boring. There are a lot of random statistics out there -- eg, enclosed water area in different countries -- that would make the game mind-numbing. Things like release dates of classic movies are more interesting (to most people). Other interesting ones we've found include Olympic records, median incomes for different professions, dates of famous inventions, and celebrity ages. Scraping things like above, by the way, was my reason for asking this question: http://stackoverflow.com/questions/2611418/scrape-html-tables So, if you know of other sources of interesting numerical facts (in a parsable form) I'm eager for pointers to them. Thanks!

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