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  • Why is it bad to use boolean flags in databases? And what should be used instead?

    - by David Chanin
    I've been reading through some of guides on database optimization and best practices and a lot of them suggest not using boolean flags at all in the DB schema (ex http://forge.mysql.com/wiki/Top10SQLPerformanceTips). However, they never provide any reason as to why this is bad. Is it a peformance issue? is it hard to index or query properly? Furthermore, if boolean flags are bad, what should you use to store boolean values in a database? Is it better to store boolean flags as an integer and use a bitmask? This seems like it would be less readable.

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  • Php sessions secure log in

    - by Doodle
    My question is about creating a secure log in routine. After comparing the user name and password to the stored values I set a session variable called logged to true. Then as the user surfs around the web page I just check the logged variable for true or false to determine if the user should have access. This is my first time creating something like this. Is this secure? I feel like there is something else that I should be doing to make sure that users are valid.

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  • Regex - replace only last part of an expression

    I'm attempting to find the best methodology for finding a specific pattern and then replace the ending portion of the pattern. Here is a quick example (in C#): //Find any year value starting with a bracket or underscore string patternToFind = "[[_]2007"; Regex yearFind = new Regex(patternToFind); //I want to change any of these values to x2008 where x is the bracket or underscore originally in the text. I was trying to use Regex.Replace(), but cannot figure out if it can be applied. If all else fails, I can find Matches using the MatchCollection and then switch out the 2007 value with 2008; however, I'm hoping for something more elegant MatchCollections matches = yearFind.Matches(" 2007 [2007 _2007"); foreach (Match match in matches){ //use match to find and replace value }

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  • Reading string value from Excel with HSSF but it's double

    - by egaga
    Hi, I'm using HSSF-POI for reading excel data. The problem is I have values in a cell that look like a number but really are strings. If I look at the format cell in Excel, it says the type is "text". Still the HSSF Cell thinks it's numeric. How can I get the value as a string? If I try to use cell.getRichStringValue, I get exception; if cell.toString, it's not the exact same value as in Excel sheet. Thanks! edit: until this gets resolved, I'll use new BigDecimal(cell.getNumericCellValue()).toString()

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  • NSDictionary with specific property of plist

    - by Leonardo
    Hi, I have a plist with key values. Each key represent a language, let's say 'it' 'en' ....ecc The value of each key is another key/value(=array) set. At startup I would like to create a dictionary by reading only a specific key. Let's say the locale of my iphone is 'it', then the init method would only parse it key, because the only way I found by now is to make a dictionary from the whole plist file and then another dictionary. But I can imagine this can become quite cpu consuming if I add more language in the future. thanks Leonardo

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  • How to write to the OpenGL Depth Buffer

    - by Mikepote
    I'm trying to implement an old-school technique where a rendered background image AND preset depth information is used to occlude other objects in the scene. So for instance if you have a picture of a room with some wires hanging from the ceiling in the foreground, these are given a shallow depth value in the depthmap, and when rendered correctly, allows the character to walk "behind" the wires but in front of other objects in the room. So far I've tried creating a depth texture using: glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, Image.GetWidth(), Image.GetHeight(), 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, pixels); Then just binding it to a quad and rendering that over the screen, but it doesnt write the depth values from the texture. I've also tried: glDrawPixels(Image.GetWidth(), Image.GetHeight(), GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, pixels); But this slows down my framerate to about 0.25 fps... I know that you can do this in a pixelshader by setting the gl_fragDepth to a value from the texture, but I wanted to know if I could achieve this with non-pixelshader enabled hardware?

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  • Inherited properties aren't bound during databinding

    - by Josh
    I have two interfaces, IAuditable and ITransaction. public interface IAuditable{ DateTime CreatedOn { get; } string CreatedBy { get; } } public interface ITransaction : IAuditable { double Amount{ get; } } And a class that implements ITransaction, call Transaction. public class Transaction : ITransaction{ public DateTime CreatedOn { get { return DateTime.Now; } } public string CreatedBy { get { return "aspnet"; } } public doubl Amount { get { return 0; } } } When I bind a list of ITransactions to a datagrid and use auto create columns, only the Amount gets bound. The CreatedBy and CreatedOn are not seen. Is there a way I can get these values visible during databinding?

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  • What's the difference between IEquatable and just overriding Object.Equals() ?

    - by devoured elysium
    I want my Food class to be able to test whenever it is equal to another class. I will later use it against a List, and I want to use its List.Contains() method. Should I implement IEquatable or just override Object.Equals()? From MSDN: This method determines equality by using the default equality comparer, as defined by the object's implementation of the IEquatable.Equals method for T (the type of values in the list). So my next question is: which functions/classes of the .NET framework make use of Object.Equals()? Should I use it in the first place? Thanks

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  • Sqlite: Selecting records spread over total records

    - by Martin
    I have a sql / sqlite question. I need to write a query that select some values from a sqlite database table. I always want the maximal returned records to be 20. If the total selected records are more than 20 I need to select 20 records that are spread over the total records. It is also important that I always select the first and last value from the table when sorted on the date. I know how to accomplish this in code but it would be perfect to have a sqlite query that can do the same. The query Im using now is really simple and looks like this: "SELECT value,date,valueid FROM tblvalue WHERE tblvalue.deleted=0 ORDER BY DATE(date)" Hope I explained what I need, thanks for your help!

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  • jsf flash.keep and redirects does not seem to work

    - by user384706
    Hi, I am trying to use JSF 2.0 flash via redirects. I have a class named UserBean (ManagedScoped and RequestScoped). It has a method called getValuesFromFlash which essentially gets the values from the flash and sets the coresponding properties of the UserBean public void getValuesFromFlash() { Flash flash = FacesContext.getCurrentInstance().getExternalContext().getFlash(); firstName= (String) flash.get("firstName"); lastName = (String) flash.get("lastName"); } In the entry page the <h:inputText> are bound to the flash. Snippet follows: Entry.xhtml <h:form> <table> <tr> <td>First Name:</td> <td> <h:inputText id="fname" value="#{flash.firstName}" required="true"/> <h:message for="fname" /> </td> </tr> <tr> <td>Last Name:</td> <td> <h:inputText id="lname" value="#{flash.lastName}" required="true"/> <h:message for="lname" /> </td> </tr> </table <p><h:commandButton value="Submit" action="confirmation?faces-redirect=true" /></p> </h:form> In confirmation.xhtml these values are supposed to be displayed but they are not. Snippet follows: <table> <tr> <td>First Name:</td> <td> <h:outputText value="#{flash.keep.firstName}" /> </td> </tr> <tr> <td>Last Name:</td> <td> <h:outputText value="#{flash.keep.lastName}"/> </td> </tr> </table> <h:form> <p><h:commandButton value="Confirm" action="finished?faces-redirect=true" /></p> </h:form> In finished.xhtml I want all these to be displayed so: <h:body> <h:form> #{userBean.getValuesFromFlash( )} <table> <tr> <td>First Name:</td> <td> <h:outputText value="#{userBean.firstName}" /> </td> </tr> <tr> <td>Last Name:</td> <td> <h:outputText value="#{userBean.lastName}"/> </td> </tr> </table> </h:form> </h:body> Instead when I get redirected to confirmation.xhtml neither first nor last name is displayed, despite I used flash.keep Also in finished.xhtml I get org.apache.el.parser.ParseException: Encountered " "(" "( "" at line 1, column 30. Was expecting one of: "}" ... "." If I remove the parenthesis from the expression #{userBean.getValuesFromFlash( )} and make it = #{userBean.getValuesFromFlash} javax.el.ELException: /done.xhtml: Property 'getValuesFromFlash' not found on type com.UserBean But why no property??It is a method! Why is the method not visible? What I am doing wrong here please? I am using JSF2.0 (MyFaces), Eclipse Helios and Tomcat 6 (Have also tried in Tomcat 7 but no luck). Any help is appreciated. Thanks!

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  • Nonstandard SSIS lookup

    - by Stefan
    I have a situation where I am trying to lookup a value in one table based on values in another table, using a BETWEEN operator and not an = operator. In one table, I have a value "EffectiveDate". I want to get a Weight number from another table, but the other table has two fields: "Inception" and "Termination". What I want to do is extract the Weight from that table for use where the EffectiveDate is between Inception and Termination. SSIS doesn't seem to provide a way to do this. It's good at matching one column to another column, but doesn't seem to allow one to many-column comparison/operations. Am I missing anything? Is this possible to do somehow?

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  • My presentation layer does not match my model layer even though I have no animations

    - by Kevin McCullough
    On iPhone I have a CALayer that I animate via Core Animation. Then at some point I change view controllers. I then return to the view controller with the CALayer and in viewWillAppear: I set the frame and position properties on my layer to move it back to its starting point. Setting these properties changes the model layer but the presentation layer still has the old values and its presentation layer does not update until the next animation I play. In the CA Programming guide it says "You can query an instance of CALayer for its corresponding presentation layer while an animation transaction is in process." Which, to me, implies that the presentation layer should only be different from the model layer during an animation. But there are no animations currently running. I even used kCATransactionDisableActions to ensure that when I set the position property an implicit animation is not started. Does anyone know why my presentation and model layers are out of sync? Thanks.

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  • Obfuscating Geocode results to protect privacy?

    - by Kevin
    I have an app that finds other users within a 20 mile radius on a google map and associates an icon with each of them. However, I do not want their exact points to be given but rather an approximation. I've wrestled with a few ideas on how to do this: Only Geocode the Zip Code, make graphic icons for 1-99, use the icon to represent how many results are within the zip code, and use the info window to show hyperlinks to the individual results. The only problem is, I'd like each individual icon to be shown because it just looks a lot better. Add/Subtract a random number to the lat/lng values stored with each user and add a translucent circle around the icon. What do you guys suggest?

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  • PHP / jQuery page change transition

    - by Tim
    Hey all Basically I want to replicate the page changing effect found here, at http://timvandamme.com/ But instead of using #values I want to use PHP includes, mainly because I want the site to be as uber-seo-friendly as possible... but still have this nice effect. So is there a way of doing this? I have a main index file which includes other php files in the centre using the usual 'GET' method, so my pages look like: "index.php?page=about" In my jQuery code I want to have a declaration where if I click the navigation, the content scrolls up, then once the relevant PHP file has loaded, have the content scroll back down and show the new page content (whilst also of navigated to the new page in the address bar, so if the user clicks the back button in their browser, they return to the previous page). I know how to code the scrolling bits, it's just literally the ajax loading includes / page navigation parts I'm struggling to work out :\ Any help would be MUCH appreciated!!! Thanks in advance. Tim

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  • Delphi Search Edit Component

    - by Reber
    Hi, I need a delphi component for Delphi 2007 win32 that have features like Google search text box. ** While User writing search key it should fill/refresh the list with values, and user can select one of them. **User can go up and down list and can select one of them. **List should contain codes and text pair, so user can select text and I can get code for database operations. (Google can highlight the search text in List but I think it is not possible with Delphi 2007, so it is not excepted.) I tried Dev Express TcxMRUEdit, however it doesn't meet my needs

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  • Min/Max across an array of objects

    - by graham.reeds
    It has been done to death pretty much, here on SO and around the 'Net. However I was wondering if there was a way to leverage the standard min/max functions of: Array.max = function(array) { return Math.max.apply(Math, array); }; Array.min = function(array) { return Math.min.apply(Math, array); }; So I can search across an array of objects of say: function Vector(x, y, z) { this.x = x; this.y = y; this.z = z; } var ArrayVector = [ /* lots of data */ ]; var min_x = ArrayVector.x.min(); // or var max_y = ArrayVector["y"].max(); Currently I have to loop through the array and compare the object values manually and craft each one to the particular need of the loop. A more general purpose way would be nice (if slightly slower).

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  • Alternative to BitConverter.ToInt32

    - by MusiGenesis
    I'm using BitConverter.ToInt32 to pack 3 byte values into an int, like so: byte R = 0; byte G = 0; byte B = 0; int i = BitConverter.ToInt32(new byte[] { R, G, B, 0 }, 0); Is there a faster way to do this that doesn't involve the creation of a new int each time? Getting the bytes out of an int is easy: int i = 34234; byte B = (byte)(i >> 0); byte G = (byte)(i >> 8); byte R = (byte)(i >> 16); Is there a simple way to reverse this process and use bit-shifting to write the RGB bytes back over an existing int?

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  • Is there good .sol editor for Flash Player 9 Local Shared Objects? Can we build one?

    - by nerdabilly
    There's plenty of them out there but none of them do what I would like them to do. Most of them crash when opening a file or simply corrupt the data. Many don't run at all. It seems to me that most were written 3-4 years ago for AS2 .sols and no longer work with FP9/AS3 sols. I'd attempt to write my own using AIR but I can't find a new spec of the byte format. There's an explanation of the file format here: http://sourceforge.net/docman/display_doc.php?docid=27026&group_id=131628 and another here: http://sourceforge.net/docman/display_doc.php?docid=27026&group_id=131628 but it looks as though both of these docs are a good 4 years old (pre-FP9) and as I'm not skilled or experienced in file formats, writing a new one, especially without an updated spec, is seeming like less and less of a viable option. Ideally I'd like one that can not only read the .sol, but edit and save new values also. Thanks!

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  • Binding a list of checkboxes from view to posted collection in ASP.NET MVC 2

    - by mare
    Given the code below within which I render a bunch of checkboxes in my view and the code for controller, someone please explain how can I get the values of the checkboxes (I need the key and the checked status) in the controller. <% foreach (string mappingId in Model.Mappings) {%> <tr><td> <%=mappingId %><br /> <%=Html.Label("Checkbox_" + mappingId, "Sync?")%> <%=Html.CheckBox("Checkbox_" + mappingId, true) %> </td></tr> <% } %> [HttpPost] public ActionResult Sync(FormCollection collection) { foreach (var posted in collection) { // here the "posted" variable shows up in the debugger as // "Checkbox_AD0D1" as Value (AD0D1 being the key in my model) and of type "object" // of course, this line fails but it shows what I want to do bool currentCheckbox = (bool) posted; } return View(); }

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  • JTable filled with database data is not being updated when columns are reordered.

    - by marionmaiden
    I have a JTable filled with data of a table of my database (so I used ResultSetTableModel) and using TableRowSorter to sort the rows, as I click in one column of the JTable. The data is displayed in the jTable without problems; But when I sort the JTable by some column table (for example, sorting it by the primary key value), and edit some cell from the sorted jTable, the value changed is the old cell that were in that position before the ordenation of the column. For example: Suppose I have a table with 2 columns - name and age. My table has the following data: c 1 b 2 a 3 when I order i by name in the JTable, it becomes like this a 3 b 2 c 1 if I edit the value "1", after the edition, the table becomes like this a 1 b 2 c 1 It seems that the positions are not being updated in the JTable, and the values are edited considering their original positions.

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  • VARCHAR does not work as expected in Apache Derby

    - by Tom Brito
    I'm having this same problem: How can I truncate a VARCHAR to the table field length AUTOMATICALLY in Derby using SQL? To be specific: CREATE TABLE A ( B VARCHAR(2) ); INSERT INTO A B VALUES ('1234'); would throw a SQLException: A truncation error was encountered trying to shrink VARCHAR '123' to length 2. that is already answered: No. You should chop it off after checking the meta-data. Or if you don't wanna check the meta-data everytime, then you must keep both your code and database in sync. But thats not a big deal, its a usual practice in validators. but my doubt is: isn't VARCHAR suppose to variate its size to fit the data? What's wrong with apache derby's VARCHAR?

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  • Using TSQLUnit to test INSTEAD OF triggers

    - by Jeff Jones
    I have an INSTEAD OF trigger on a table in my SQL Server 2005 database that checks several incoming values. If an incoming value is invalid, an error is raised and the transaction is rolled back. Otherwise the record is inserted. I would like to include a TSQLUnit test of this trigger where, if an invalid value is inserted, having the transaction rolled back is the successful outcome of the test. I have created a test procedure to do this, but rolling back the transaction aborts execution of the whole suite of tests. Has anyone had success with this? If so, how did you accomplish it? If this is not possible with TSQLUnit, how do you test your triggers? Or do you test them at all?

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  • How to use derived class shared variables in shared methods of base class

    - by KoolKabin
    Hi guys, I am trying to add shared members in derived classes and use that values in base classes... I have base class DBLayer public shared function GetDetail(byval UIN as integer) dim StrSql = string.format("select * from {0} where uin = {1}", tablename, uin) .... end function end class my derived class class User inherits dblayer public shared tabledname as string = "users" end class class item inherits dblayer public shared tabledname as string = "item" end class class category inherits dblayer public shared tabledname as string = "category" end class currently there is error using the tablename variable of derived class in base class but i want to use it... coz i dun know other techniques... if other solutions are better then u can post it or u can say how can i make it work? confused...

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  • PostgreSQL JOIN with array type with array elements order, how to implement?

    - by Adiasz
    Hello I have two tables in database: CREATE TABLE items( id SERIAL PRIMARy KEY, ... some other fields ); This table contains come data row with unique ID. CREATE TABLE some_choosen_data_in_order( id SERIAL PRIMARy KEY, id_items INTEGER[], ); This table contains array type field. Each row contains values of IDs from table "items" in specyfic order. For example: {2,4,233,5}. Now, I want to get data from table "items" for choosen row from table "some_choosen_data_in_order" with order for elements in array type. The my attempt is JOIN: SELECT I.* FROM items AS I JOIN some_choosen_data_in_order AS S ON I.id = ANY(S.id_items) WHERE S.id = ? Second attempt was subquery like: SELECT I.* FROM items AS I WHERE I.id = ANY (ARRAY[SELECT S.id_items FROM some_choosen_data_in_order WHERE id = ?]) But none of them keep IDs order in array field. Could You help me, how to get data from "items" table with correspond with array IDs order from "some_choosen_data_in_order" table for specyfic row?

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  • Create WPF TextBox that accepts only numbers

    - by Elad
    I would like to create a TextBox that only accepts numeric values, in a specific range. What is the best way to implement such TextBox? I thought about deriving TextBox and to override the validation and coercion of the TextProperty. However, I am not sure how to do this, and I understand that deriving WPF control is generally not recommended. Edit: What I needed was a very basic textbox that filters out all key presses which are not digits. The easiest way to achieve it is to handle the TextBox.PreviewTextInput event: private void textBox_PreviewTextInput(object sender, TextCompositionEventArgs e) { int result; if (!validateStringAsNumber(e.Text,out result,false)) { e.Handled = true; } } (validateStringAsNumber is my function that primarily use Int.TryParse) Some of the suggested solutions are probably better, but for the simple functionality I needed this solution is the easiest and quickest to implement while sufficient for my needs.

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