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• How is this relation in 4th normal form? Is the dependency trivial?

  - by squ

  I have a question that concerns multi value dependency. The relation looks like this: R(A,B) with A -->> B (A multi value determines B) I've been told that this relation is in 4th normal form, but I don't really se how. I know that if the multi value dependency is trivial, then it doesn't violate the 4th normal form. But is this trivial? It would be trivial if it, for example, looked like this: {A,B} -->> B But the first dependency example shouldn't be trivial. The other rule for 4th NF says that A in this case needs to be a super key of the relation, but it isn't. As far as I can tell, A isn't a super key, since {A,B} is needed to identify a tuple. So the question is, why is this in 4th normal form? It seems to be violating both of the rules.

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• Problem in appending a string to a already filled string builder(at the beginning by using INSERT) a

  - by Newbie

  I have a string builder like StringBuilder sb = new StringBuilder("Value1"); sb.AppendLine("Value2"); Now I have a string say string str = "value 0"; I did sb.Insert(0,str); and then string[] strArr = sb.ToString().Trim().Replace("\r", string.Empty).Split('\n'); The result I am getting as (Array size of 2 where I should get 3) [0] value 0 Value1 [1] value2 But the desired output being [0] Value 0 [1] Value1 [2] Value2 Where I am going wrong? I am using C#3.0 Please help.. It 's urgent Thanks

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• iOS sdk question: how do I cast a UIView to a UIImage View (alternativly how do I get a UIImageView from a GestureRecognzer?)

  - by user439299

  Desired end result: user taps a UIImageView and the image changes to another image (a subsequent tap returns the image to the original state) Problem: I add a (unique) selector to a bunch of UIImageViews (in an array) and point the action at the same function - let's call this function imageTapped: for now. Here is my code so far: -(void)imageTapped:(UITapGestureRecognizer *)tapGesture { UIImageView *view = tapGesture.view; // rest of code... } This code actually works fine but gets a warning when I run it: "Incompatible objective c types initilizing 'struct UIView *', expected 'struct UIImageView *' Any way to get rid of this? Not sure how casting works in objective c... primitive types seem to work fine such as (int)someFloat works fine but (UIImageView)someUiView doesn't work. Like I said, code works alright when I run it but would like to get ride of the compiler warning. Any help would be awesome.... I am very new to objective c (or any non java language for that matter) so be gentle. Thanks in advance.

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• How to count number of occurences for all different values in database column?

  - by drasto

  I have a Postgre database that has say 10 columns. The fifth column is called column5. There are 100 rows in the database and possible values of column5 are c5value1, c5value2, c5value3...c5value29, c5value30. I would like to print out a table that shows how many times each value occurs. So the table would look like this: Value(of column5) number of occurrences of the value c5value1 1 c5value2 5 c5value3 3 c5value4 9 c5value5 1 c5value6 1 . . . . . . What is the command that does that? Thanks for help

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• Another problem with decltype

  - by There is nothing we can do

  template<class IntT, IntT low = IntT(), IntT high = IntT()> struct X { static_assert(std::is_same<decltype(low),decltype(high)>::value,"Different types not allowed");//this should give error if types are different decltype(low) a; decltype(high) b; X():a(decltype(a)()),b(decltype(b)())//WHY THIS DOES NOT COMPILE? { cout << typeid(a).name() << '\n'; cout << typeid(b).name() << '\n'; } }; int _tmain(int argc, _TCHAR* argv[]) { X<char,1,'a'> x;//this according to static_assert shouldn't compile but it does return 0; } Using VS2010. Please see 3 comments in code above.

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• Oracle Reports SELECT INTO Not Selecting

  - by Kevin Cruz

  I'm working on a Report in Oracle Reports Builder, and having issues with my AFTERPFORM trigger. When viewing the report, it seems like the year is being processed properly, while the period and subperiod are using their initial values. I'm confused because they are the exact same select statement, but are not working as intended. Any help would be greatly appreciated! function AfterPForm return boolean is v_subpdenddt_user date; v_subpdenddt_max date; v_rowcount integer; begin select value into year from wos_report_param where parameter = 'year' and sequence_num = :sequencenum; select value into period from wos_report_param where parameter = 'period' and sequence_num = :sequencenum; select value into user_subpd from wos_report_param where parameter = 'subpd' and sequence_num = :sequencenum;

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• Problem with onsubmit ID

  - by Liso22

  I need an onsubmit to return false if what's written on the first field is a certain PHP value however the field has a strange id format and I'm not quite sure how to add it in the onsubmit. This is the form, I didn't add the element ID to it: <form class="questionform" name="questionform-0" id="questionform-0" onsubmit="if (document.getElementById('').value == '<?php echo $casi; ?>') return false;" > <textarea class="question-box" style="width:97%;" cols="20" rows="4" id="question-box-' . $questionformid . '" name="title" type="text" maxlength="80" size="28" value=""></textarea> I tried many times but couldn't add it. How should I do it? Thanks

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• Why the data binding in this validation example works in WPF?

  - by MartyIX

  I'm wondering how exactly the XAML sample (MSDN sample) works: <Style x:Key="textBoxInError" TargetType="{x:Type TextBox}"> <Style.Triggers> <Trigger Property="Validation.HasError" Value="true"> <Setter Property="ToolTip" Value="{Binding RelativeSource={x:Static RelativeSource.Self}, Path=(Validation.Errors)[0].ErrorContent}"/> </Trigger> </Style.Triggers> </Style> Questions: (Validation.Errors)[0].ErrorContent - Is this code somehow checked by WPF? Because Validation.Errors may be an empty collection and in ordinary C# code this code may throw an exception. If this data-binding returns null for valid input - the null value is then casted to empty string (in a text control for example)? The index 0 corresponds to the first error message. How can I return more error messages from Validate method? Thank you for responses!

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• Access shell methods in controller? Cake PHP 1.3

  - by anonymous coward

  I wrote a shell method in CakePHP 1.3 that has a return value. I'd like to be able to access that method from within a controller, so that I can pass its return value into the View. I'm not sure how to access those methods appropriately from within the controller. Have I done it wrong? I could easily duplicate the code, but I'd like to "keep it DRY", and the actual functionality, I believe, doesn't belong with this particular controller - I just need it's return value in this particular view.

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• How can i get the selected option name or id of a select element using jQuery

  - by bill

  Hi All, i have a "questionairre" that is made up of a series of select boxes. i need to use two properties in the options. For each selected option i need the value (which i know how to get and is working fine) but i also need to store an additional value which represents the id of the specific option in a DB. One solution would be to put the two values in the "value" property and parse it out.. but if there is some other property i can use that might be easier and clearer.. can i add a custom property?? like databaseId that could be accessed with jQuery? thanks for ANY suggestions.

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• Pattern matching against Scala Map type

  - by Tom Morris

  Imagine I have a Map[String, String] in Scala. I want to match against the full set of key–value pairings in the map. Something like this ought to be possible val record = Map("amenity" -> "restaurant", "cuisine" -> "chinese", "name" -> "Golden Palace") record match { case Map("amenity" -> "restaurant", "cuisine" -> "chinese") => "a Chinese restaurant" case Map("amenity" -> "restaurant", "cuisine" -> "italian") => "an Italian restaurant" case Map("amenity" -> "restaurant") => "some other restaurant" case _ => "something else entirely" } The compiler complains thulsy: error: value Map is not a case class constructor, nor does it have an unapply/unapplySeq method What currently is the best way to pattern match for key–value combinations in a Map?

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• [JQuery] Edit Css with animation effect

  - by Pennywise83

  Hi, I've a div in a absolute position with a default "top" value set to "-200px". When i click on the div the "top" value is updated to "0". In this way I see the entire Div. This is the js: $(document).ready(function(){ $("#search_bar").click(function () { $(this).css("top","0"); }); }); Is there a way to achieve this result but with an animation? For example, a slide down effect? Also, when i click another time to the div I'd like that the "top" value will be restored to "-200px".

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• Append more that one control to div

  - by Kemrop

  Ok this will be quick. I am collecting data in div by inserting hidden input boxes before i eventually submit to the server. here is Javascript code. function appendToDiv() { var mydiv=document.getElementById("somediv"); var mydata=document.getElementsByName("description")[0].value; var myurl=document.getElementsByName("url")[0].value; var data=mydata+myurl; mydiv.innerHTML="<input type='hidden' name='sUrl[]'value='"+data+"'/" } I have an onchange event that keeps calling the above guy until i am satisfied that i have all i need to send to the server.Problem is only one input get appended to the div.What could i be missing.

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• Javascript function not working with an array

  - by Ryan Harvie

  Hi, i have this function which loops through an array of check boxes checking if the boxes value is equal to something in a text box, i dont know whats wrong. function checkValue(contain) { var boxes = document.getElementsByTagName("input"); for (var i = 0; i < boxes.length; i++) { if (boxes[i].name == "vote[]") { if (boxes[i].value.indexOf(contain.value) != -1) { boxes[i].checked = true; } } } } and this is how i call it OnClick="uncheckAll(); checkValue(document.getElementsByName("countrylist"));" this code is in side a echo in php which is like this echo ' ';

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• How to cast/convert form Object in an byte[] array

  - by maddash

  I've got a maybe simple problem, but at the moment I am not able to solve it. I have an Object and I need to convert it into a byte[]. public byte[] GetMapiPropertyBytes(string propIdentifier) { return (byte[])this.GetMapiProperty(propIdentifier); //InvalidCastException } Exception: Unable to cast COM object of type 'System.__ComObject' to class type 'System.Byte[]'. Instances of types that represent COM components cannot be cast to types that do not represent COM components; however they can be cast to interfaces as long as the underlying COM component supports QueryInterface calls for the IID of the interface. So far so good - I've tried to serialize it, but I got another exception - NOT serializable Could someone help me? I need a method to convert it...

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• What do C# Table Adapters actually return?

  - by Raven Dreamer

  I'm working on an application that manipulates SQL tables in a windows form application. Up until now, I've only been using the pre-generated Fill queries, and self-made update and delete queries (which return nothing). I am interested in storing the value of a single value from a single column (an 'nchar(15)' name), and though I have easily written the SQL code to return that value to the application, I have no idea what it will be returned as. SELECT [Contact First Name] FROM ContactSkillSet WHERE [Contact ID] = @CurrentID Can the result be stored directly as a string? Do I need to cast it? Invoke a toString method?

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• MYSQL sum() for distinct rows

  - by makeee

  I'm looking for help using sum() in my SQL query (not posting full query since the scenario is fairly simple). I have COUNT(DISTINCT conversions.id) in my query. I use DISTINCT because I'm doing "group by" for multiple columns and this ensures the same row is not counted more than once. Now I want to add: SUM(conversions.value) as conversion_value The problem is that the "value" for each row is counted more than once (due to the multiple group bys) I basically want to do SUM(conversions.value) for each DISTINCT conversions.id. Is that possible?

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• Can the Browser 'Forward' Button be Set from HTML?

  - by John C

  Example: At the bottom of the StackOver Questions page are a bunch of page numbers (1,2,3...), enclosed in a set of prev and next buttons. Clicking next repeatedly will bring me to, say page 5, at which point I will have: The page's prev button will be set to 'http://stackoverflow.com/questions?page=4' The Back button on my Browser will have the same value. The page's next button will be set to 'http://stackoverflow.com/questions?page=6' The Forward button on my Browser - won't be set to anything. Obviously, if I hit the Back button on the Browser, then Forward will have a value, pointing to the URL for page 5 - but not otherwise. Is there any way, from HTML (plus Javascript), to set the value of the Browser's Forward button? Or is this one of those things that HTML is simply forbidden to do?

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• Radio Button wont work in internet explorer but works fine in firefox

  - by Mo

  Hi i have HTML code like so: <div id="action_content" class="layout"> <input type="hidden" id="action_editing" value=""/> <div id="action_types"> <input type="radio" checked name="action_type" value="EmailActionDescription" onclick="toggle_action(this);"/><label>Email</label> <input type="radio" name="action_type" value="TicketActionDescription" onclick="toggle_action(this);"/><label>Ticket</label> </div> it works fine in firefox but dosent work in internet explorer. any ideas what it could be? the buttons basically display one of 2 options, a ticket or e mail, when clicking on the ticket it just dosent show. if you require any further information please let me know. thanks

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• Calling inheriting class methods via interface.

  - by Stacey

  Given the scenario... interface IBase{ void Process(int value); } abstract class Base : IBase { public virtual void Process(int value){ throw new NotImplementedException(); } } class Implemented: Base, IBase { public void Process(int value) { // .. some code here.. } } I'm trying to write a loop similar to the following. foreach( Base b in CollectionOfImplemented ) { b.Process( // something will go here // ); } Trying this, it keeps calling Base.Process, instead of Implemented.Process; but the type in the collection is Implemented, not Base. Boxing it seems to work, but I was hoping to see if I could find a more intelligent approach to it, since the Collection will contain other types of objects that also inherit from Base.

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• JavaScript to enable "submit" button (doesn't work)

  - by Halst

  I need the button "submit" to be disabled unless JavaScript is on. I tried: 1. <input onLoad="this.disabled=false" id="post-comment" type="submit" value="Post Your Comment" disabled="disabled"/> 2. <input onLoad="this.removeAttribute("disabled");" id="post-comment" type="submit" value="Post Your Comment" disabled="disabled"/> 3. <input onLoad="document.getElementById("post-comment").removeAttribute("disabled");" id="post-comment" type="submit" value="Post Your Comment" disabled="disabled"/> Doesn't work. I'm new to JavaScript, but can't find answer on the net.

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• WPF-to stroke arc with two different brushes

  - by user1914725

  i am new to geometric drawing in wpf. i have a volmeter arc that needs to have alert value. The section of the arc beyond that alert value has to be done with a different color than the rest of the arc. hence the arc is brushed with 2 different colors. a path has one brush at a time.hence how i apply two different pens to the same arc? the alert value is obtained with a lot of pain by doing calculations like gemetry.getpointatfraction.it won't easy to apply triggers any suggestions /approach?

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• is this possible: c# collection of Type with constrains, or collection of generic type?

  - by Jon

  I'm trying to store types in a collection, so that i can later instantiate objects of the types in the collection. But I'm not sure how to do this the best way. What i have so far: List<Type> list = new List<Type>(); list.Add(typeof(MyClass)); var obj = (MyClass)Activator.CreateInstance(list[0]); I would like to have some constrains on the Type, or better yet, just a generic type in the collection instead of an instantiated Type object. Is this possible?

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• assigning a rank based on total sales

  - by Nathaniel_613

  I need to create a field called “rank”, that ranks each part ID based on total sales, by assigning a sequential number based on total sales, where the higher the total sales, then the lower the rank value. For example, the part ID with the most sales would have a rank value of “1” and the part ID with the next highest sales would have a rank value of “2” and the part ID with the lowest sales would rank with the highest number. If 2 different parts ID’s have the same total sales, then it is OK if they share the same rank. Please provide me the SQL to copy and paste Thank you very much in advance, Nathaniel SELECT qry_rank_01.[total sales amount], qry_rank_01.PART_ID FROM qry_rank_01;

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• mootools 1.11 .setHTML not working in IE

  - by moleculezz

  Hello, I am trying to make a form dynamic using mootools 1.11, for specific reasons I cannot upgrade atm. I'm trying to manipulate a select field to have dynamic options. This works in Firefox & Chrome but not IE8. Hope there's a fix for this. bits of the code: myOptions(hrs+1, 23, 'uur'); $('vertrektijd_uur').setHTML('<option value="">Kies uur</option>'+options_uur); $('vertrektijd_uur').addEvent('change', function() { hrsChanged = $('vertrektijd_uur').getValue(); hrsChanged = parseInt(hrsChanged); if(hrs+1 == hrsChanged) { myMinutes(parseInt(min)); myOptions(minChanged, 55, 'min'); $('vertrektijd_min').setHTML('<option value="">Kies minuten</option>'+options_min); } else { myOptions(0, 55, 'min'); $('vertrektijd_min').setHTML('<option value="">Kies minuten</option>'+options_min); } });

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