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• Database Design for One to One relationships

  - by Greelmo

  I'm trying to finalize my design of the data model for my project, and am having difficulty figuring out which way to go with it. I have a table of users, and an undetermined number of attributes that apply to that user. The attributes are in almost every case optional, so null values are allowed. Each of these attributes are one to one for the user. Should I put them on the same table, and keep adding columns when attributes are added (making the user table quite wide), or should I put each attribute on a separate table with a foreign key to the user table. I have decided against using the EAV model. Thanks!

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• Building a NSPredicate for a filter

  - by John

  Hi, Just wondering what the best way to build a NSPredicate is if some filters are optional? This is basically for a filter, so if some options aren't selected I don't to filter by them eg. If I have option1 and option2 set for the filter. NSPredicate* predicate = [NSPredicate predicateWithFormat:@"option1 = %@ AND option2 = %@] .... otherwise if just option1 NSPredicate* predicate = [NSPredicate predicateWithFormat:@"option1 = %@] .... The key being there are 10 different options to filter, so I don't want to have to code for the 10x10 possible combinations. Thanks

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• Search relevance from XML docs (XQuery?) vs MySQL

  - by Marius

  Hello there, I have a website where documents are saved in xml documents, all with the same structure. I need a search engine where I am able to choose documents with the highest relevance according to the key words given by a searching user. I thought it could (?) be a good idea to have one using XQuery rather than having the information stored twice (in XML docs + mysql database) and querying the mysql database for relevance searches. Is XQuery any good for this, and how, and what speed can I expect on +1000 documents of about 7kb each. Thank you for your time. Kind regards

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• Big table or multiple separate tables? (database design question)

  - by Khou

  This is a database design question. I want to build an invoice web application, an invoice can have many items, and each user can have an inventory list of product items that they can store and choose to add to an invoice item. My questions are: 1. Should I store all product inventory for all users using my application under one single table? Or have a separate product inventory table created for each user? 2. Is this even possible? 1 table is easier, but what if this single table grows too big, will I have a problem? (primary key INT).

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• Issue in accessing JSON object?

  - by Esh

  Am facing issue in accessing the JSON object : JSON Object am receiving is : {"71":"Heart XXX","76":"No Heart YYYY"} I tried to get the value of 71 and 72 separately and use it ... but am getting some compile time issue as : Syntax error on token ".71", delete this token Code: var map=$("#jsonText").val(); alert(map); var obj=jQuery.parseJSON(map); alert("JSON ::"+obj.71); If am printing obj , am able to view [Object Object] Can any one out there please help me to find the mistake i did ..I know the question above is asked in many threads in SO . Below are the few threads i found , but failed when i attempted to implement it .. jquery json parsing Also tried using the Jquery tutorial given in Jquery JSON Its working fine if the key is a String but getting the above error if its a number ...

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• Excel 2007 - Worksheet is larger than the window

  - by Chris

  Hi This is an odd problem but frustrating none the less. I have a worksheet saved which is larger than the Excel 2007 "workarea". This means when I open the worksheet I cannot access the corners of the worksheet to reduce the size and the worksheets title bar area (with move,size,minimise etc) is hidden beneath the ribbon , even if I remove the ribbon , I still can't see the title bar. In Excel 2003 I've had a similar effect but I've always been able to hit the "alt" key to access the "Move" option. However in Excel 2007 , hitting "alt" brings up some shortcuts for the ribbon etc but I can't access the worksheet options. Has anyone else know how to access the worksheet drop down when this happens?

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• [Hibernate] Problem with saveOrUpdate()

  - by kunkanwan

  Hi, I've problem with Hibernate. I have a class User class User { int id; String name; } where id is native generator in User.hbm.xml , and name is primary-key in DB. In my database , I saved some information about Users. Than, I want to connect with this information about User. For example in my DB i have row INSERT INTO User VALUES ('Bill'); Main.java User bill = new User(); bill.setName("Bill"); session.saveOrUpdate(bill); This code always trying insert bill to database , rather than update when row about Bill exists in DB... Could you help me ? Thank you for advance.

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• What do you read?

  - by sixtyfootersdude

  I have almost finished reading all the articles on Joel on software. I am a new developer and hoping to get something interesting to read. Here is what is currently on my list: Java Concurrency in Practice by Brian Goetz sed & awk by Dougherty & Robbins (O'Reilly) The Pragmatic Programmer by Andrew Hunt and David Thomas Head First Design Patterns Can anyone suggest anything else? Would especially like something similar to Joel. Something that is a bit edgy but informative. Pragmatic programmer has some key concepts but is a bit dry.

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• Detect movie being played (Windows)

  - by modosansreves

  Watching a movie is quite a different user activity. User doesn't touch neither mouse nor keyboard. Yet he 'actively' uses the computer. Thus, screensaver shouldn't run, indexing should be performed with care etc. On the other side, playing video requires either using direct write to video memory, or DirectShow, or some other API. This may be the key to the answer. What is the Dead Simple Way to determine that a video is being played?

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• How do I get the NextVal from an oracle Sequence thru NHibernate

  - by trainer

  I am working on c# .net 4.0 and using NHibernate to talk with an Oracle DB. You would think something as simple as this is already addressed somewhere but sadly its not. I need the NextVal from an Oracle sequence. I do not need to insert it a database as part of an Id or Primary key. I just need to use the next val on the c# side. Can somebody help me out with xml mapping and C# file(or a link) to achieve this. Thanks. Something like int NextValueOfSequence = GetNextValueofSequence(); public int GetNextValueOfSequence() { // Access NHibernate to return the next value of the sequence. }

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• Is there anything like memcached, but for sorted lists?

  - by depesz

  I have a situation where I could really benefit from having system like memcached, but with the ability to store (per each key) sorted list of elements, and modifying the list by addition of values. For example: something.add_to_sorted_list( 'topics_list_sorted_by_title', 1234, 'some_title') something.add_to_sorted_list( 'topics_list_sorted_by_title', 5436, 'zzz') something.add_to_sorted_list( 'topics_list_sorted_by_title', 5623, 'aaa') Which I then could use like this: something.get_list_size( 'topics_list_sorted_by_title' ) // returns 3 something.get_list_elements( 'topics_list_sorted_by_title', 1, 10 ) // returns: 5623, 1234, 5436 Required system would allow me to easily get items count in every array, and fetch any number of values from the array, with the assumption that the values are sorted using attached value. I hope that the description is clear. And the question is relatively simple: is there any such system?

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• Indexing datetime in MySQL

  - by User1

  What is the best way to index a datetime in MySQL? Which method is faster: Store the datetime as a double (via unix timestamp) Store the datetime as a datetime The application generating the timestamp data can output either format. Unfortunately, datetime will be a key for this particular data structure so speed will matter. Also, is it possible to make an index on an expression? For example, index on UNIX_TIMESTAMP(mydate) where mydate is a field in a table and UNIX_TIMESTAMP is a mysql function. I know that Postgres can do it. I'm thinking there must be a way in mysql as well.

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• django forms from two tables referencial integrity

  - by dana

  i have a class named cv,and a class named university, and each user that completes his cv, should choose a University he studyes at. My problem is: one student can study at one or 2 or three universities, or may be a user that is not student. I need to take this data into a form, and i use ModelForm. The data from the Cv class, and from the University class in the same form, and the user can add one or more universities, or no university. (in the same form) How should i do it? Should i use ModelForm? if i have a foreign key in the CV class, and the user is not a student (so he is at zero universities), i may get an referencial integrity error. thanks a lot

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• Returning messages in Smalltalk

  - by Zachary

  I have a Dictionary of objects I have created in smalltalk, which I am iterating over by enumerating it based on the key/value pairs. For value object in the dictionary, I am calling a method on that object. Based on certain conditions, I would like for this object to be able to add a new member to dictionary, and possibly delete another one. I've been looking at the 'Perform' and 'Messages' facilities in Smalltalk, but I'm not sure if it is even possible to do what I'm trying to do - is it possible to return a message (or multiple messages), which another object can process and perform? For example, could my method return 'removeKey: 19' and 'add object' at the same time? I am using GNU Smalltalk, if it matters.

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• CREATE Excel File with hyperlinks in PHP

  - by Brian

  I have the following method to create an Excel file from in PHP starting with a two-dimensional array: header("Content-Disposition: attachment; filename=ExcelFile.xls"); header("Content-Type: application/vnd.ms-excel"); $Data[] = array('field1', 'field2', 'field3'); $Data[] = array('field1', 'field2', 'field3'); $Data[] = array('field1', 'field2', 'field3'); foreach($Data as $key => $val) { echo implode("\t", array_values($val)) . "\n"; } Would it be possible to include a hyperlink to a webpage in this file?

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• I need help to debug my XML parsing please

  - by Griffo

  I'm parsing this line: <type>branch</type> with this code if ([elementName isEqualToString:@"type"]) { [currentBranchDictionary setValue:currentText forKey:currentElementName]; } When I test the value in the type key, it does not contain branch but instead it contains branch\n. Here is the test I'm performing: if ([[currentBranchDictionary valueForKey:@"type"] isEqualToString:@"branch"]) { NSLog(@"no new-line"); } else if ([[currentBranchDictionary valueForKey:@"type"] isEqualToString:@"branch\n"]) { NSLog(@"new-line"); } this returns the "new-line" output I don't understand where the carriage return is being added, can anyone help?

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• Can a proxy server cache SSL GETs? If not, would response body encryption suffice?

  - by Damian Hickey

  Can a (||any) proxy server cache content that is requested by a client over https? As the proxy server can't see the querystring, or the http headers, I reckon they can't. I'm considering a desktop application, run by a number of people behind their companies proxy. This application may access services across the internet and I'd like to take advantage of the in-built internet caching infrastructure for 'reads'. If the caching proxy servers can't cache SSL delivered content, would simply encrypting the content of a response be a viable option? I am considering all GET requests that we wish to be cachable be requested over http with the body encrypted using asymmetric encryption, where each client has the decryption key. Anytime we wish to perform a GET that is not cachable, or a POST operation, it will be performed over SSL.

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• DB2 Child Table - Auto Delete With Parent

  - by gamerzfuse

  I have a bit of a task before me. (DB2 Database) I need to create a table that will be a child table (is that what it is called in SQL?) I need it so that it has a foreign key constraint with my other table, so when the parent table is modified (record deleted) the child table also loses that record. Once I have the table, I also need to populate it with the data from the other table (if there is an easy way to UPDATE this). If you could point me in the right direction, this would help alot, as I do not even know what syntax to look for. Thanks in advance

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• Quantity in amazon cart?

  - by user201140

  Hi I'd like to change the quantity in an AWS order. I've used the form below and that works fine for adding 1 item to the cart, but when I try to change it to a quantity of 2 it says there are no items in my cart. What am I doing wrong? Thanks. <form method="GET" action="http://www.amazon.com/gp/aws/cart/add.html" id="Quantity"> <input type="hidden" name="AWSAccessKeyId" value="Access Key ID" /> <input type="hidden" name="AssociateTag" value="Associate Tag" /> <?php echo "<input type='hidden' name='ASIN.1' value='".$itemid."'/>"; ?> <input type="hidden" name="Quantity.1" value="1"/><br/> <input type="image" src="buynow.gif" value="Submit" alt="Submit"> </form>

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• sql jdbc getgeneratedkeys with mysql returns column "id" not found

  - by iamrohitbanga

  I want to retrieve the most recently updated value in the table using an insert query. these are the datatypes in my sql table. int(11) // primary key auto increment, not being assigned by sqlQuery varchar(30) timestamp // has a default value. but i am explicit assigning it using CURRENT_TIMESTAMP varchar(300) varchar(300) varchar(300) int(11) varchar(300) // java code statement.executeUpdate(sqlQuery, Statement.RETURN_GENERATED_KEYS); ResultSet rs = statement.getGeneratedKeys(); System.out.println("here: " + rs.getMetaData().getColumnCount()); System.out.println("here1: " + rs.getMetaData().getColumnName(1)); // none of the following 3 works System.out.println("id: " + rs.getInt(1)); System.out.println("id: " + rs.getInt("GENERATED_KEY")); System.out.println("id: " + rs.getInt("id")); for a bit of background see this

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• Asp.Net Error Message:Unable to validate data

  - by Amitabh

  We have a Asp.Net Webform page which contains a GridView inside UpdatePanel and refreshes every minute. And every one minute we get the following error in Event log. Error Message:Unable to validate data. Stack Trace: at System.Web.Configuration.MachineKeySection.GetDecodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString). We have tried the following. Adding a static machine key in the Web.Config. (Did not work?) Disabling the View State Mac in the Web,.Config using following entry. (Did not work) <pages buffer="true" enableViewStateMac="false"> Is there something else that might cause this?

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• hadoop mapper static initialisation

  - by rakeshr

  Hi, I have a code fragment in which I am using a static code block to initialize a variable. public static class JoinMap extends Mapper<IntWritable, MbrWritable, LongWritable, IntWritable> { ....... public static RTree rt = null; static { String rtreeFileName = "R.rtree"; rt = new RTree(rtreeFileName); } public void map(IntWritable key, MbrWritable mbr,Context context) throws IOException, InterruptedException { ......... List elements = rt.overlaps(mbr.getRect()); ....... } } My problem is that the variable rt in the above code fragment is not getting initialised. Can anybody suggest a fix or an alternate way to initialise the variable. I don't want to initialise it inside my map function since that slows down the entire process.

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• C# Count registry keys existing using a partial value

  - by cheeseman

  Microsoft.Win32.RegistryKey registryPath = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Wow6432Node\Testing"); Microsoft.Win32.RegistryKey entryKey = registryPath.OpenSubKey("Entry Point"); I have a lot of keys in Testing, in the format: "Entry Point 011", "Entry Point 123" - so Entry Point with random numbers after it. Would I be able to search the registryPath variable above and get a count of the number of keys containing the "Entry Point" keyword? Assuming that there are also other keys existing without this keyword. At the moment I have been using a for loop and looping for all possible combinations to get a count of all the keys, checking if the key exists or not, but as there are keys as high as "Entry Point 9000" having a for loop execute 9000 times is very inefficient. for (int i = 0; i <= highestEntryPointValue; i++) { Microsoft.Win32.RegistryKey entryKey = steamApps64.OpenSubKey("Entry Point " + Convert.ToString(i)); if (entryKey != null) { count++; } }

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• How to select a MenuItem programatically

  - by Shaung

  I am trying to add a global shortcut to a gtk.MenuItem which has a sub menu. Here is my code: import pygtk, gtk import keybinder dlg = gtk.Dialog('menu test') dlg.set_size_request(200, 40) menubar = gtk.MenuBar() menubar.show() menuitem = gtk.MenuItem('foo') menuitem.show() menubar.append(menuitem) mitem = gtk.MenuItem('bar') mitem.show() menu = gtk.Menu() menu.add(mitem) menu.show() menuitem.set_submenu(menu) def show_menu_cb(): menubar.select_item(menuitem) keybinder.bind('<Super>i', show_menu_cb) dlg.vbox.pack_start(menubar) dlg.show() dlg.run() When I press the key menu pops up, I can then select items in the sub menu or press Esc to make it disappear. But after that the menuitem keeps selected and other windows never get input focus again. I have to click on the menuitem twice to get everything back normal.

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• How do I sum values from two dictionaries in C#?

  - by George Stocker

  I have two dictionaries with the same structure: Dictionary<string, int> foo = new Dictionary<string, int>() { {"Table", 5 }, {"Chair", 3 }, {"Couch", 1 } }; Dictionary<string, int> bar = new Dictionary<string, int>() { {"Table", 4 }, {"Chair", 7 }, {"Couch", 8 } }; I'd like to sum the values of the dictionaries together and return a third dictionaries with the keys, and the total values for each key: Table, 9 Chair, 10 Couch, 9 My current solution is to loop through the dictionary and pull them out that way, but I know that solution isn't the most performant or most readable. However, I'm hitting a brick wall trying to come up with a solution in LINQ.

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