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• count(*) vs count(column-name) - which is more correct?

  - by bread

  Does it make a difference if you do count(*) vs count(column-name) as in these two examples? I have a tendency to always write count(*) because it seems to fit better in my mind with the notion of it being an aggregate function, if that makes sense. But I'm not sure if it's technically best as I tend to see example code written without the * more often than not. count(*): select customerid, count(*), sum(price) from items_ordered group by customerid having count(*) > 1; vs. count(column-name): SELECT customerid, count(customerid), sum(price) FROM items_ordered GROUP BY customerid HAVING count(customerid) > 1;

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• What is the most efficient way to read many bytes from SQL Server using SqlDataReader (C#)

  - by eccentric

  Hi everybody! What is the most efficient way to read bytes (8-16 K) from SQL Server using SqlDataReader. It seems I know 2 ways: byte[] buffer = new byte[4096]; MemoryStream stream = new MemoryStream(); long l, dataOffset = 0; while ((l = reader.GetBytes(columnIndex, dataOffset, buffer, 0, buffer.Length)) > 0) { stream.Write(buffer, 0, buffer.Length); dataOffset += l; } and reader.GetSqlBinary(columnIndex).Value The data type is IMAGE

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• Group by clause return latest row information

  - by I Like PHP

  below is my table structure table_movie_info i_movie_id |movie_actor_id |movie_actress_id |movie_director_id | movie_producer_id 48 | 5 | 9 | 66 | 21 48 | 6 | 15 | 88 | 22 48 | 7 | 12 | 77 | 23 one more table is table_movie movie_id | movie_year | movie_genre_id |movie_rating 1 | 2009 | 6 | 8 2 | 2001 | 5 | 7.5 48 | 2007 | 3 | 6.8 now i need total movie information using both table,i write below query SELECT * FROM table_movie_info LEFT JOIN table_movie ON movie_id = i_movie_id WHERE i_movie_id=48 GROUP BY i_movie_id above query return only one row , but i need such type of information movie_id=48, actors_id list=5,6,7 acttress_id list=9,15,12 etc.. please tell me the optimized query which h return complete information i need. thanks for helping me always.

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• VHDL Simulation Timing Behaviour

  - by chris

  I'm trying to write some VHDL code that simply feeds sequential bits from a std_logic_vector into a model of an FSM. However, the bits don't seem to be updating correctly. To try figure out the issue, I have the following code, where instead of getting a bit out of a vector, I'm just toggling the signal x (the same place I'd be getting a bit out). clk <= NOT clk after 10 ns; process(clk) begin if count = 8 then assert false report "Simulation ended" severity failure; elsif (clk = '1') then x <= test1(count); count <= count + 1; end if; end process; EDIT: It appears I was confused.I've put it back to trying to take bit by bit out of the vector. This is the output. I would have thought that on when count is 1, x would take on the value of test1(1) which is a 1.

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• Design pattern: Polymorphism for list of objects

  - by ziang

  Suppose I have a class A, and A1, A2 inherits from A. There are 2 functions: List<A1> getListA1(){...} List<A2> getListA2(){...} Now I want to do something similar to both A1 and A2 in another function public void process(List<A>){...} If I want to pass the instance of either ListA1 or ListA2, of course the types doesn't match because the compiler doesn't allow the coercion from List< A1 to List< A. I can't do something like this: List<A1> listA1 = getListA1(); List<A> newList = (List<A>)listA1; //this is not allowed. So what is the best approach to the process()? Is there any way to do it in a universal way rather than write the similar code to both List and List?

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• How to customize the Combobox dropdown list?

  - by lp

  I have created a Combo box using HIComboBoxCreate(). When I have a long string in the dropdown list, it goes beyond the screen and the starting of the string is not visible. I want the string to be truncated with ellipsis in such a case. I have looked into the ComboBox attributes but couldn't find any that I can use to set this. I'm ready to write some extra code to do this, but I'm not sure if it possible. Can someone please help?

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• Overloading assignment operator in C#

  - by Carson Myers

  I know the = operator can't be overloaded, but there must be a way to do what I want here: I'm just creating classes to represent quantitative units, since I'm doing a bit of physics. Apparently I can't just inherit from a primitive, but I want my classes to behave exactly like primitives -- I just want them typed differently. So I'd be able to go, Velocity ms = 0; ms = 17.4; ms += 9.8; etc. I'm not sure how to do this. I figured I'd just write some classes like so: class Power { private Double Value { get; set; } //operator overloads for +, -, /, *, =, etc } But apparently I can't overload the assignment operator. Is there any way I can get this behavior?

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• Flash: How to get a list to be processed synchronous instead of asynchronous?

  - by Quandary

  Question: In Flash I have the below function. Now the problem is SaveFurniture, SavePolygons and SaveComments all save to the same XML file. Now SaveFurniture sends JSON encoded data to a ashx handler, which saves it in the xml on the server. The problem is, because flash sends the data asynchronous, the polygons get sent to the polygonsave ashx handler, but before saving of the furniture has completed, thus access error, write process already in progress... // cSaveData.SaveData(); public static function SaveData():void { trace("cSaveData.SaveData"); //NotifyASPXofNewScale(cGlobals.nPlanScale); SaveFurniture(); SavePolygons(); SaveComments(); } What's the best way to process this list, ONE AFTER ANOTHER ? Making a callback in all of them does make the program flow structure very confusing...

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• getting the names of elements in JS/jQuery

  - by Mala

  I have some checkbox inputs like so: <input type="checkbox" name="1" class="filter"/> <input type="checkbox" name="2" class="filter"/> ...etc... I'm trying to write a function where any time a checkbox is selected, it generates a string with all the names concatenated. Here's what I have so far: $('.filter').click(function(event){ var filters = $('.filter').toArray(); var fstr = ""; for (f in filters) { fstr = fstr+","+f.name; } alert(fstr); }); The names keep coming up as 'undefined', though (i.e. the alert returns ,undefined,undefined,undefined,undefined,undefined,undefined). How do I access the names?

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• Automatic program update and Windows 7

  - by Mmarquee

  Hi We have a suite of programs that check for new versions at startup, and then download new versions to run if required. This is obviously a problem in Windows 7, when it is locked down as a 'standard user', as they can't write to the c:\program files directory and below. Anyone seen a example of an application that gets around with issue ? Our applications are written in Delphi, but an example in any language would be useful. Thanks in advance Update: We already have a system for determing whether a new version exists, the only problem is the download and install (if required), as this requires elevation. I can't think of a way that doesn't require an elevation prompt, or our users to reduce their security settings. Update 2 : I've asked a subsequent question, rather than adding a new one here

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• c# How to make linq master detail query for 0..n relationship?

  - by JK

  Given a classic DB structure of Orders has zero or more OrderLines and OrderLine has exactly one Product, how do I write a linq query to express this? The output would be OrderNumber - OrderLine - Product Name Order-1 null null // (this order has no lines) Order-2 1 Red widget I tried this query but is not getting the orders with no lines var model = (from po in Orders from line in po.OrderLines select new { OrderNumber = po.Id, OrderLine = line.LineNumber, ProductName = line.Product.ProductDescription, } ) I think that the 2nd from is limiting the query to only those that have OrderLines, but I dont know another way to express it. LINQ is very non-obvious if you ask me!

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• css not:first-child selector

  - by OTARIKI

  I have div tag and him is several ul tags. If I trying set css properties only for first ul tag, this code works: div ul:first-child { background-color: #900; } But when i want set css properties each ul tags, except first, I trying this: div ul:not:first-child { background-color: #900; } also this div ul:not(:first-child) { background-color: #900; } and this div ul:first-child:after { background-color: #900; } But effect none. Someone tell please, how must write in css: "each element, except first" ?

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• How to kill a quoted string at point in emacs?

  - by user1350992

  I would like to kill a quoted string in a source file without having to mark the beginning of the string and kill-region, but just by placing the point anywhere inside the quoted string and pressing a shortcut. I tried to write a function in elisp for this, but I figured out that the file would need to be parsed from the beginning up to point to determine whether the point is inside quoted string, and to find the bounds of the quoted string(also handle the \")... But the file is already parsed by font-lock. So now I can find out if I'm inside quoted string: (defun inside-quoted-string? () (interactive) (print (find 'font-lock-doc-face (text-properties-at (point))))) But how do I get the bounds of the string? font-lock knows it, since it nicely highlights it in blue, but how do I get it?

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• Django 1.2: Dates in admin forms don't work with Locales (I10N=True)

  - by equalium

  I have an application in Django 1.2. Language is selectable (I18N and Locale = True) When I select the english lang. in the site, the admin works OK. But when I change to any other language this is what happens with date inputs (spanish example): Correctly, the input accepts the spanish format %d/%m/%Y (Even selecting from the calendar, the date inserts as expected). But when I save the form and load it again, the date shows in the english form: %Y-%m-%d The real problem is that when I load the form to change any other text field and try to save it I get an error telling me to enter a valid date, so I have to write all dates again or change the language in the site to use the admin. I haven't specified anything for DATE_INPUT_FORMATS in settings nor have I overridden forms or models. Surely I am missing something but I can't find it. Can anybody give me a hint?

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• is there any Simple opensource live audio streaming Server using WCF? (see specification below)

  - by Ole Jak

  is there any Simple opensource live audio streaming Server using WCF? I need it to have simple structure: it should listen to some url format like http://example.com/service/stream?write&id=ANY_STRING and if any data comes to such address format it'll start making it avaliable by something like this http://example.com/service/stream?read&id=ANY_STRING Main thing here to be able to stream live data thru WCF service not buffering it just sharing stream. So can please any one help me with such idea? I think not only I have seen such problem with WCF alot on different sites so answer will help the WCF comunyty alot. I hope. BTW: I know some people say WCF is not prepared for live streaming over bacikHTTPbinding but hey! We all need it to, and we ask MS alot so some day they'll make it beter and we all want to be prepared for it.

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• Per Process Memory Calculation Alogrithm in Linux (say kernel 2.6 and above)

  - by Vaibhav Singh

  How do you calculate the linux process's Acutal Memory Usage and Not Virtual Memory Usage through the information supplied by /proc//smaps or maps or status or stat. To be more precise I need the heap usage only. I need to do this on an PowerPc based embedded system and hence I do not have utilities like exmap, valgrind etc. I understand the concepts of shared/non shared memory. I have read through the other topics given in this forum about the same but they talk more using the tools mentioned. What I need is the native way of calculation done by the same tools so that I may write a shell script for the same.

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• one query instead of four - is it possible?

  - by Syom

  i must get data from four tables. i wrote the script with four queries, but i use it in ajax, and i wan't to do it by one query. here is queries... $query1 = "SELECT `id`,`name_ar` FROM `tour_type` ORDER BY `order`"; $query2 = "SELECT `id`,`name_ar` FROM `hotel_type` ORDER BY `order`"; $query3 = "SELECT `id`,`name_ar` FROM `food_type` ORDER BY `order`"; $query4 = "SELECT `id`,`name_ar` FROM `cities` WHERE `id_parrent` = '$id_parrent' ORDER BY `name_ar`"; is it possible to write in one query? thanks

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• Extracting a reference from a c++ vector

  - by Archanimus

  Hello folks, I have a vector< vector< vector< int and I would like to extract from it a vector< vector< int to process it individually. The problem is that when I write : myMatrix = myCube[anIndex]; the matrix is copied but I only want a reference in order to save memory. Can you please help me out ? Thanks a lot!

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• How to create a web framework in C# without ASP?

  - by Mark

  I've managed to get a C# asp page running under ubuntu/apache/mono, but I don't want to write my framework in these ASP pages, I want to use straight C# and then I'll use a templating language for my views. But I don't know where to begin? C# is a compiled language, so... how would I do this? Would I compile everything and then have apache hook into the (single) executable and pass in the the request URL? Could I request specific .cs pages and then have apache tell it to compile and then "display" it only if it's been updated? Can the "view" files be compiled individually to avoid having to recompile everything every time there's a change? Is there some "base" I can work from, or am I going to have to reinvent accessing GET and POST variables (by reading header info) and all sorts of other stuff we take for granted in languages like PHP?

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• C struct print, decode this code?

  - by pauliwago

  I am in the process of studying for a test, and I'm trying to work through some practice problems. I've been working on this a while now..but can't figure it out. Please take a look at the code fragment: union { int i; short x; unsigned short u; float f; } testout; testout.i=0xC0208000; Before I ask the question, can someone please explain to me how the above code works?? My guess is that testout.i=0xC0208000 puts either an int, short, unsigned short, or float and puts the result in that address. (?) The question is what prints out if we write printf("%d", testout.x)? I know we should expect digits....but I have no idea where they are getting the digits from....there is no output. Any explanation would be greatly appreciated. Thanks!

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• java - Depth First Search - Perform DFS on a tree

  - by DJDonaL3000

  Im trying to perform DFS on a Minimum Spanning Tree which contains 26 nodes. Nodes are named 'A' to 'Z' and the tree is undirected. I have an empty function called DFS here that I am trying to write, which (i presume) takes in the tree (a 2D array) a startNode (randomly selected node 'M') and the endNode (randomly selected node 'Z'). The weights of connected nodes are identified in the 2D array parameter, but how do I actually get started visiting nodes? All that is required is to print each nodeName in the order of the DFS traversal. Do I need to create a Node_class for each node in the 2d array??

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• Talking with a Bittorrent client listening on a port?

  - by Legend

  I have one of my computers seeding a torrent file on port 45000. I am trying to write a small client in python (or perhaps perl) that helps me to determine the types of messages this client supports for which I need to perhaps do a handshake with the client. In Azureus, this is done using a call like peer.getSupportedMessages(). Is it possible to do this using some library in python or perl? An example of the returned messages would look like this: BT_KEEP_ALIVE BT_PIECE BT_REQUEST BT_UNCHOKE BT_UNINTERESTED BT_SUGGEST_PIECE BT_HAVE_ALL BT_HAVE_NONE BT_REJECT_REQUEST BT_ALLOWED_FAST BT_LT_EXT_MESSAGE BT_DHT_PORT lt_handshake ut_pex

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• Where Not In OR Except simulation of SQL in LINQ to Object(C#)

  - by Thinking

  Suppose I have two lists that holds the list of source file names and destination file names respectively. The Sourcefilenamelist has files as 1.txt, 2.txt,3.txt, 4.txt while the Destinaitonlist has 1.txt,2.txt. I ned to write a linq query to find out which files are in SourceList that are absent in DestinationFile list. e.g. here the out put will be 3.txt and 4.txt. I have done this by a foreach statement.. but now I want to do the same by using LINQ(C#). Help needed. Thanks

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• SQL To Filter A SubSet Of Data

  - by Nick LaMarca

  I have an arraylist that holds a subset of names found in my database. I need to write a query to get a count of the people in the arraylist for certain sections i.e. There is a field "City" in my database from the people in the arraylist of names I want to know how many of them live in Chicago, how many live in New York etc. Can someone help me how I might set up an sql statement to handle this. I think somehow I have to pass the subset of names to sql somehow.

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• Unit testing task queues in AppEngine

  - by Swizec Teller

  For a very long time now I've been using task queues on AppEngine to schedule tasks, just the way I'm supposed to. But what I've always been wondering is how does one write tests for that? Until now I've simply made tests to make sure an error doesn't occur on the API that queues a task and then wrote the more proper tests for the API executing the task. However lately I've started feeling a bit unsatisfied by this and I'm searching for a way to actually test that the correct task has been added to the correct queue. Hopefully this can be done better than simply by deploying the code and hoping for the best. I'm using django-nonrel, if that has any bearing on the answer. To recap: How can a unit test be written to confirm tasks have been queued?

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