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  • Does the order of conditions in a WHERE clause affect MySQL performance?

    - by Greg
    Say that I have a long, expensive query, packed with conditions, searching a large number of rows. I also have one particular condition, like a company id, that will limit the number of rows that need to be searched considerably, narrowing it down to dozens from hundreds of thousands. Does make any difference to MySQL performance whether I do this: SELECT * FROM clients WHERE (firstname LIKE :foo OR lastname LIKE :foo OR phone LIKE :foo) AND (firstname LIKE :bar OR lastname LIKE :bar OR phone LIKE :bar) AND company = :ugh or this: SELECT * FROM clients WHERE company = :ugh AND (firstname LIKE :foo OR lastname LIKE :foo OR phone LIKE :foo) AND (firstname LIKE :bar OR lastname LIKE :bar OR phone LIKE :bar)

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  • Is it OK to set state within Event Raising methods?

    - by Greg
    I ran across this pattern in the code of a library I'm using. It sets state within the event raising method, but only if the event is not null. protected virtual void OnMyEvent(EventArgs e) { if(MyEvent != null) { State = "Executing"; // Only sets state if MyEvent != null. MyEvent(this,e); } } Which means that the state is not set when overriding the method: protected override void OnMyEvent(EventArgs e) { base.OnMyEvent(e); Debug.Assert( State == "Executing" ); // This fails } but is only set when handling the event: foo.MyEvent += (o, args) => Debug.Assert(State == "Executing"); // This passes Setting state within the if(MyEvent != null) seems like bad form, but I've checked the Event Design Guidelines and it doesn't mention this. Do you think this code is incorrect? If so, why? (Reference to design guidelines would be helpful). Edit for Context: It's a Control, I'm trying to create subclass of it, and the state that it's setting is calling EnsureChildControls() conditionally based upon there being an event handler. I can call EnsureChildControls() myself, but I consider that something of a hack.

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  • RegEx - character not before match

    - by danneth
    I understand the consepts of RegEx, but this is more or less the first time I've actually been trying to write some myself. As a part of a project, I'm attempting to parse out strings which match to a certain domain (actually an array of domains, but let's keep it simple). At first I started out with this: url.match('www.example.com') But I noticed I was also getting input like this: http://www.someothersite.com/page?ref=http://www.example.com These rows will ofcourse match for www.example.com but I wish to exclude them. So I was thinking along these lines: Only match rows that contain www.example.com, but not after a ? character. This is what I came up with: var reg = new RegExp("[^\\?]*" + url + "(\\.*)", "gi"); This does however not seem to work, any suggestions would be greatly appreciated as I fear I've used what little knowledge I yet possess in the matter.

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  • Unit test approach for generic classes/methods

    - by Greg
    Hi, What's the recommended way to cover off unit testing of generic classes/methods? For example (referring to my example code below). Would it be a case of have 2 or 3 times the tests to cover testing the methods with a few different types of TKey, TNode classes? Or is just one class enough? public class TopologyBase<TKey, TNode, TRelationship> where TNode : NodeBase<TKey>, new() where TRelationship : RelationshipBase<TKey>, new() { // Properties public Dictionary<TKey, NodeBase<TKey>> Nodes { get; private set; } public List<RelationshipBase<TKey>> Relationships { get; private set; } // Constructors protected TopologyBase() { Nodes = new Dictionary<TKey, NodeBase<TKey>>(); Relationships = new List<RelationshipBase<TKey>>(); } // Methods public TNode CreateNode(TKey key) { var node = new TNode {Key = key}; Nodes.Add(node.Key, node); return node; } public void CreateRelationship(NodeBase<TKey> parent, NodeBase<TKey> child) { . . .

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  • Floating point innacuracies

    - by Greg
    While writing a function which will perform some operation with each number in a range I ran into some problems with floating point inaccuracies. The problem can be seen in the code below: #include <iostream> using namespace std; int main() { double start = .99999, end = 1.00001, inc = .000001; int steps = (end - start) / inc; for(int i = 0; i <= steps; ++i) { cout << (start + (inc * i)) << endl; } } The problem is that the numbers the above program outputs look like this: 0.99999 0.999991 0.999992 0.999993 0.999994 0.999995 0.999996 0.999997 0.999998 0.999999 1 1 1 1 1 1.00001 1.00001 1.00001 1.00001 1.00001 1.00001 They only appear to be correct up to the first 1. What is the proper way to solve this problem?

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  • Creating a library of classes in php - how to handle the library root location?

    - by jax
    I am about to create a collection of classes in php which are interrelated. Now I would like to include files using their absolute path, ie If I were in '/com/mysite/licences/Generator.class.php' I would like to include files like this: include '/com/mysite/lib/Utils.class.php' I don't want to include like this, I think it is confusing and ugly include '../licenses/Utils.class.php' This works ok, unless 'com' is not in the root of public_html. I assume I will need some sort of prefix to append to each file LIBRARY_ROOT that hold the location of 'com' in the current filesystem. So it might look like this include LIBRARY_ROOT.'com/mysite/lib/Utils.class.php' What is the best way to do this?

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  • why does my C# client that uses Library A need to have a using statement for Library B (which A uses

    - by Greg
    Hi, I have: Main Program Class - uses Library A Library A - has partial classes which mix in methods from Library B Library B - mix in methods & interfaces So in Library B when I include a partial Node class which implements INode (defined in Library B) I suddenly get an error in my main class where it uses Node from Library A. The error tells me in the Main Class I have to have a using statement to Library B. Any ideas?

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  • C++ inheritance question

    - by user233973
    Hi guys, I have a C++ inheritance related question. I have a set of classes like this (I have not given the complete class structure coz I am lazy :) ). I want to access chiComponent class public methods using com pointer. How should I go about it? Note that I am having to change the object which "com" is pointing to in a lot of places. So I do not think I can have another chiComponent *ccom = <some_cast> com; ccom.chiComponentMethod() How should I go about it? class Component{ }; class chiComponent : public Component { public: void chiComponentMethod() { cout << "Hi! Chi component function called!!"; } } class parent { protected: Component *com; }; class child : public parent{ public: child() { com = new chiComponent(); } } Regards Arun

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  • Categorized SharePoint Discussion - default category to parents category on reply.

    - by Greg Ogle
    I have a Discussion Board in a SharePoint site which has an additional column named Category. When a new discussion is created, it prompts for Category, and of course this is by design. The problem is that when the discussion is replied to, it prompts for the category again. How can I separate the reply functionality so that the Category is not prompted and the Category is set to that of the discussion under which it resides? I attempted to edit a copy of NewForm.aspx in SharePoint Designer, but you can only edit which WebPart it is using, not which fields are displayed.

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  • Absolute URL Path for PHP Website

    - by kakaajee
    Hi friends, I am working on a website in a CMS site. I have provided a link in my footer file e.g blogs.php. This page is at the root like "http://www.example.com/new_cms/blogs.php" When I moves to other files link like "http://www.example.com/new_cms/forums" the footer link is changed to "http://www.example.com/new_cms/forums/blogs.php" but the blogs.php page resides at path "http://www.example.com/new_cms/" . I tried different $_SERVER[] variables but got no luck to get the above path "http://www.example.com/new_cms/" means the server name with the directory where the project is currently running from. Any one have idea how to get it done will be a great help. Thanks

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  • SQL - Dervied Foreign Key - Possible?

    - by Chad
    I'm just curious if this is possible, specifically in SQL CE (Express) with support in .NET's Entity Framework: Table1 (primary) -nvarchar(2000) url -... Table2 (with foreign key) -nvarchar(2000) domain -... foreign key on Table2.domain references Table1.url such that Table.url contains Table2.domain e.g. Table1: http://www.google.com/blah/blah http://www.cnn.com/blah/ http://www.google.com/foo Table2: google.com cnn.com Is it possible for this to be scripted and enforced by SQL CE (let alone any relation database) and, if so, can .NET's Entity Framework automatically support this if I import my database into a model?

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  • Redirecting a url - Wordpress

    - by duckofrubber
    Hi, I'm working on a wordpress site, with a blog post that ends like: http://www.blog.com/?p=2. However, I need to change the wordpress settings so that posts end in the following format: http://www.blog.com/02/11/2009/this-is-a-post. When I do this, obviously it will break outside links to the post that is named http://www.blog.com/?p=2. So my question is how can I manaully redirect a url http://www.blog.com/?p=2 to go to a working url http://www.blog.com/02/11/2009/this-is-a-post ? Thanks.

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  • does class/object models have a out-of-the-box equivalent to a database foreign key constraint

    - by Greg
    Hi, Does does class/object models have a out-of-the-box equivalent to a database foreign key constraint? Assume the language is C# please. That is say Class A has a field that references Class B and vica-versa. If I have Object A & B (instantiated from these classes) what happens if I delete Object B? Does it auto-delete or throw a constraint issue if it still exists in Object A as a reference? That is, for this scenario is there a way to ensure when a Object A is delete that either (a) object B is delete like a cascade delete, or (b) a constraint exception is thrown as the expectation is that the reference in Class B should be non-null?

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  • c# open webrowser in many tab

    - by tee
    how can i create tab tab1 open samsung.com tab2 open hp.com ... 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; namespace browsergotosamsung { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { webBrowser1.Navigate("http://www.samsung.com"); webBrowser2.Navigate("http://www.hp.com"); webBrowser3.Navigate("http://www.IBM.com"); } private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) { } private void webBrowser3_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) { } private void webBrowser2_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) { webBrowser2.Size } } }

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  • Reason for .Net UI Element Thread-restriction

    - by Charles Bretana
    We know that it is not possible to execute code that manipulates the properties of any UI element from any thread other than the thread the element was instantiated on... My question is why? I remember that when we used COM user interface elements, (in COM/VB6 days), that all UI elements were created using COM classes and co-classes that stored their resources using a memory model referred to as Thread-Local-Storage (TLS) , but as I recall, this was required because of something relaetd to the way COM components were constructed, and should not be relevant to .Net UI elements. Wha's the underlying reason why this restriction still exists? Is it because the underlying Operating System still uses COM-based Win32 API classes for all UI elements, even the ones manipulated in a managed .Net application ??

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  • lua - how to call function from above it in code (prior to it being defined)?

    - by Greg
    what is the syntax (i.e. code example) in Lua so you can call a function prior to it being defined? i.e. how do you kind of create the function, but then add it's implementation further down in code. So roughly like this: define function name (doX) here somehow (i.e. subject of this question) call doX here (further down in the code) doX implemention here (i.e. all functions down at the bottom of the file)

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  • How do I get the sequence of numbers in a sorted-set that are between two integers in clojure?

    - by Greg Rogers
    Say I have a sorted-set of integers, xs, and I want to retrieve all the integers in xs that are [x, y), ie. between x and y. I can do: (select #(and (>= % x) (< % y)) xs) But this is inefficient - O(n) when it could be O(log n), I expect the number of elements returned to be small. Using take-while and drop-while would let me exit once I've reached y, but I still can't jump to x efficiently. I am just learning clojure so here is how I would do it in C++: set<int>::iterator first = xs.lower_bound(x); set<int>::iterator last = xs.lower_bound(y); for (; first != last; ++first) // do something with *first Can I do this in clojure?

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  • How to determine element touched on touchend for a page with layers

    - by Greg
    I cannot supply a follow up question as of yet to Get the element under a touchend , so I am opening a new issue. I want to get the element under a touchend that is different from the touchstart, but my page has absolutely positioned elements, and the function document.elementFromPoint keeps on returning my background element instead of every element in front of it. How do I get the actual element being touched?

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  • C++ - Creating a god object

    - by Greg Kritzman
    Hypothetical situation that I'm struggling to get my head past. HoldsFooBar.h: #include "foo.h" #include "bar.h" class HoldsFooBar{ foo F; bar B; }; foo.h: //includes? class foo{ HoldsFooBar *H; void Baz(); }; bar.h: //includes? class bar{ HoldsFooBar *H; void Qux(); }; I'm trying to get F to get a hold of B. In all other languages I've worked with, I would be able to H->B.Qux();, but I'm totally lost in C++. At the includes lines in foo.h and bar.h, it seems like my options are to forward-declare class HoldsFooBar; but then I can only access H, and F and B cannot see each other. Likewise, I can #include "HoldsFooBar.h" but because of my include guards, something ends up not getting linked properly, so the program doesn't run. Is what I'm trying to do even possible? Thank you very much! Any help would be appreciated!

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  • jQuery .ready() automatically assigning variables for each element with ID in DOM

    - by Greg
    I have noticed some unexpected behaviour when using the jQuery .ready() function, whereby afterwards you can reference an element in the DOM simply by using its ID without prior declaration or assignment: <html> <script src="jquery.js"></script> <script> $(document).ready(function() { myowndiv.innerHTML = 'wow!' }); </script> <body> <div id="myowndiv"></div> </body> </html> I would have expected to have to declare and assign myowndiv with document.getElementById("myowndiv"); or $("#myowndiv"); before I could call innerHTML or anything else on it? Is this behaviour by design? Can anyone explain why? My fear is that if I refactor and end up not using .ready() or even using jQuery at all then my code will fail to execute. Cheers!

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  • Exception in Google App Engine (Java) while trying to create Memcache Object

    - by Shreeni
    I am coming back to an old Google App Engine project on which I saw a bug. During this lag, I have been upgrading my AppEngine SDK and is now set at 1.3. When I try to run the same project again, I see the following exception: java.lang.NoSuchMethodError: com.google.apphosting.api.ApiProxy$Environment.getDefaultNamespace()Ljava/lang/String; at com.google.appengine.api.NamespaceManager.get(NamespaceManager.java:56) at com.google.appengine.api.memcache.MemcacheServiceImpl.setNamespace(MemcacheServiceImpl.java:181) at com.google.appengine.api.memcache.MemcacheServiceImpl.(MemcacheServiceImpl.java:145) at com.google.appengine.api.memcache.MemcacheServiceFactory.getMemcacheService(MemcacheServiceFactory.java:25) The line causing the problem is: CacheManager.getInstance().getCacheFactory().createCache(Collections.emptyMap()); (It is the same line as suggested by the AppEngine documentation to create a memcache object. It used to work fine previously. ) Any suggestions on how to fix it?

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  • Redirect issues

    - by pinniger
    Whoever wrote the navigation for the site I’m currently working on (classic asp) points the navigation links to a folder, then inside to folder has an index.asp file, so the urls will look something like this www.mysite.com/myfolder/mysubfolder Now, when watch the page load using httpfox, I notice that the first entry is a 302 redirect to the same address with a “/” on the end, so www.mysite.com/myfolder gets redirected to www.mysite.com/myfolder/ (note the / on the end). I’m not to worried that it’s a 302 since its in the admin section of the site, but when I forward the host headers from ISA server, for an https request, its being redirected from https://www.mysite.com/myfolder to http://www.mysite.com:443/myfolder/ and causing all kinds of problems. Anyway, I can’t seem to find any code making this redirect happen, so does IIS 6 do this because the url points to a folder? Or do I need to comb through the code more closely?

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