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• ResultSet and aggregation

  - by kachanov

  Ok, I admit my situation is special There is a data system that supports SQL-92 and JDBC interface However the SQL requets are pretty expensive, and in my application I need to retreive the same data multiple times and aggregate it ("group by") on different fields to show different dimensions of the same data. For example on one screen I have three tables that show the same set or records but aggregated by City (1st grid), by Population (2nd grid), by number of babies (3rd grid) This amounts to 3 SQL queries (which is very slow), UNLESS anyone of you can suggest any idea any library from apache commons or from google code, so that I can select all records into ResultSet and get 3 arrays of data group by different fields from this single ResultSet. Am I'm missing some obvious and unexpected solution to this problem?

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• How do you store sets in Cassandra?

  - by Ben W

  I'd like to convert this JSON to a data model in Cassandra, where each of the arrays is a set with no duplicates: var data = { "data1": { "100": [1, 2, 3], "200": [3, 4] }, "data2": { "k1", [1], "k2", [4, 5] } } I'd like to query like this: data["data1"]["100"] to retrieve the sets. Anyone know how you might model this in Cassandra? (The only thing I came up with was columns whose name was a set value and the value of the column was an empty string, but that felt wrong.) It's not OK to serialize the sets as JSON or some other string, which would make this much easier. Also, I should note that it's OK to split data1 and data2 into separate ColumnFamilies, it's not necessary that they're keys in the same one.

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• How to sort an array or ArrayList<Point> ASC first by x and then by y?

  - by newba

  Hi everyone, I just want to use Collections.sort or Arrays.sort to sort a list of points (class Point) by x first and then by y. I have a class Ponto that implements Comparable like this: public int compareTo(Ponto obj) { Ponto tmp = obj; if (this.x < tmp.x) { return -1; } else if (this.x > tmp.x) { return 1; } return 0; } but now I want to sort by y too after x. How can I do that by modifying the above code? Or is that a better and "clean" way to do this? I also use to pass this code to C++, in which I've created a structure called Point with a equivalent comparable method.

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• Custom "Very Long Int" Division Issue

  - by befall

  Hey everyone, So, for a very silly project in C++, we are making our own long integer class, called VLI (Very Long Int). The way it works (they backboned it, blame them for stupidity) is this: User inputs up to 50 digits, which are input as string. String is stored in pre-made Sequence class, which stores the string in an array, in reverse order. That means, when "1234" is input, it gets stored as [4|3|2|1]. So, my question is this: How can I go about doing division using only these arrays of chars? If the input answer is over 32 digits, I can't use ints to check for stuff, and they basically saying using long ints here is cheating. Any input is welcome, and I can give more clarification if need be, thanks everyone.

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• automated printouts from a wireless printer

  - by Piotr

  I have a wireless printer which is always on, and an always on fanless linux server. Looking at the mprinter project on Kickstarter I started to wonder if there is an app somewhere in the internet already that will allow to prepare an automated daily printout based on some settings. things to be printed could include - weather forecast for my locations, todo`s scheduled for that day, a "quote of a day" or "word of the day", stats from google analytics for my site, and many more ... I would set a printout at 6:15 every work day so its on my printer when I am already up, having a coffee. anyone knows something that can be used for such purpose? While I know this can be done by combining the power of TeX, cron and a script language to manage the dynamic part of the PDF I believe this is a use case someone has already addressed.

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• Tunneling HTTPS traffic via a PUTTY/SSL tunnel with SOCKS

  - by ripper234

  I have configured a SOCKS ssh tunnel to a remote proxy, and set my Firefox to use localhost:<port> as a SOCKS proxy. My intention is to tunnel outgoing HTTP/S connections from my machine via a specific 3rd party server I own (on AWS). In my testing, HTTP UTLs are forwarded properly (e.g. when I access http://jsonip.com/ from my computer I do get the server's IP) However, whenever I try to reach an HTTPS address, I get this error: The proxy server is refusing connections How do I debug/fix it? My PUTTY tunnel config is simply (some random source port number + dynamic checked): P.S. I'm aware I might need to manually accept SSL certificates. The reason I'm doing this is to resolve problems using gmail as an outbound SMTP service.

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• How to dynamically insert text from an external file in a Powerpoint slide?

  - by Xavier Nodet

  My goal is to ensure that the C++ code I insert in my presentation compiles correctly. I therefore thought I'd have each example in a separate file (so that I can compile it), and include the text from those files in the Powerpoint slides... I want this 'inclusion' to be dynamic, so that if I change the code in a file, the slides are automatically updated. Is it possible? Will I have to use LaTeX instead of Powerpoint? Any other suggestion about how to solve this problem? Thanks.

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• Thunderbird is unable to find server in DHCP controlled network.

  - by Skizz

  I have a network which consists of linux server and a combination of WinXP, Win7 and linux clients. All the systems are given dynamic IP addresses by the router which connects them all together. The server hosts an IMAP mail server. On Win7 and WinXP Thunderbird can access the IMAP server without any problems. On the linux client, using the same IMAP parameters, Thunderbird is unable to connect to the server. How do I get Thunderbird to find the server? I'm not sure if this is a linux system configuration problem or a Thunderbird issue. Additional note: The linux client is running Gnome, the server has a series of Samba shares defined. In the client, doing Places-Connect to Server and selecting Windows Share and specifying the server name, the Samba share is mounted OK.

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• Asp.net razor textbox array for list items

  - by yycdev

  I can't find or figure out how to take a list of items (cupcakes) and display them in razor with a quantity field. What is happening is I am not able to get the values for each cupcake quantity in the list. Can you do textbox arrays in Razor? VIEW <div class="form-group"> <label>Cupcakes</label> @foreach (var cupcake in Model.CupcakeList) { @Html.TextBox("CupcakeQuantities", cupcake.Id) @cupcake.Name <br/> } </div> MODEL public List<Cupcake> CupcakeList { get; set; } public List<int> CupcakeQuantities { get; set; } CONTROLLER public ActionResult Create() { var model = new PartyBookingModel() { CupcakeList = db.Cupcakes.ToList(), CupcakeQuantities = new List<int>() }; return View(model); }

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• Two routers, one off-site, same ISP-assigned static IP. A recipe for conflict?

  - by boost

  This is the situation I've inherited: There are two routers, one off-site. Both are connected to the ISP. The ISP assigns both of them the same static IP (or so it seems). Presumably, the network problems we're having are related to the idea that you can't have two instances of the same IP. So we rang up the folk off-site and told them to turn off the router. Now everything's working okay here. How do I get around this? Get another static IP? Figure out how to get the router to ask for a dynamic IP (as we're not using the static IP for anything)?

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• web spidering/crawling, can i do it or just search engines?

  - by bboyreason

  i already had a question answered about web-scraping with wget. but as i read a little more, i realize i may be looking for a web-crawling program. particularly the part about web-crawlers being able to get specific data like links or, in my case, products. all of the products on my site have the following naming convention, website.com/uniqueAlphaNumericID.html as far as i know, no dynamic content generation is being used and only one page per one item in the above format. should i just be thinking about: wget website.com | grep *.html or should i be looking into spiders/crawlers?

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• Sort/Enumerate an NSArray from somewhere in the middle?

  - by Kenny Winker

  I have an NSArray, with objects ordered like so: a b c d e f I would like to enumerate through this array in this order: c d e f a b i.e. starting at some point that is not the beginning, but hitting all the items. I imagine this is a matter of sorting first and then enumerating the array, but I'm not sure if that's the best technique... or, frankly, how to sort the array like this. Edit Adding details: These will be relatively small arrays, varying from 3 to 10 objects. No concurrent access. I'd like to permanently alter the sort order of the array each time I do this operation.

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• Minimize VirtualBox Hard Drive disk

  - by Aviv

  I have Ubuntu Server 10.04 TLS installed on a Virtual Machine in a VirtualBox. The size of the Hard Drive is dynamic growing hard drive and the maximum is 32GB. At the beginning i had 4GB on the Hard Drive and the size of the .vdi was 4GB. Lately the size of data on the disk is 15GB but the size of the .vdi is almost 32GB. Why is that? How can i pack / optimize / defrag the HD so it will be the same size of the data on the disk? Thanks.

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• Array in Bash Not Found

  - by Waffle

  I am trying to declare an array in bash, but when the code is run it says it cannot find the array. I have tried to write out the declaration of the array in several different ways, but it seems no matter how I try to declare it I cannot get it to work. I originally tried to declare it as such: candidate[1]= 0 candidate[2]= 0 candidate[3]= 0 The error messages that are returned are: votecalculation.sh: 13: candidate[1]=: not found votecalculation.sh: 14: candidate[2]=: not found votecalculation.sh: 15: candidate[3]=: not found After this I tried another solution I found online: ARRAY=( 'can1' 'can2' 'can3' ) When that is used it returns this error: votecalculation.sh: 12: Syntax error: "(" unexpected I am new to Bash and am getting really confused about arrays. Is there some specific way I need to declare an array or am I just going about it completely wrong?

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• Can't inherit from auto_str without problems

  - by fret

  What I want to do is this: #include <memory> class autostr : public std::auto_ptr<char> { public: autostr(char *a) : std::auto_ptr<char>(a) {} autostr(autostr &a) : std::auto_ptr<char>(a) {} // define a bunch of string utils here... }; autostr test(char a) { return autostr(new char(a)); } void main(int args, char **arg) { autostr asd = test('b'); return 0; } (I actually have a copy of the auto_ptr class that handles arrays as well, but the same error applies to the stl one) The compile error using GCC 4.3.0 is: main.cpp:152: error: no matching function for call to `autostr::autostr(autostr)' main.cpp:147: note: candidates are: autostr::autostr(autostr&) main.cpp:146: note: autostr::autostr(char*) I don't understand why it's not matching the autostr argument as a valid parameter to autostr(autostr&).

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• Nginx proxy to Apache - resolve HTTP ORIGIN

  - by Fratyr

  I have a server setup with nginx serving static content and proxy all PHP/dynamic requests to apache on 127.0.0.1 I'm building an API for my databases, and I need to allow clients by their origin (domain name), rather than just IP. Based on CORS rules. So when I send an HTTP header header("Access-Control-Allow-Origin: www.client-requesting.myapi.com"); from my API server, I have to tell it which origin I allow, otherwise client side requests won't work to my API due to same-origin policy. The question is how can I know which domain name (if any) called my API? What should be the nginx and apache configuration to pass the origin parameter? I tried to google, and all I found is some possible solution with mod_rpaf, but I wanted to be sure. Thanks!

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• Is there a way to automate testing for a GNS3 network topology?

  - by Chedy2149

  I'm working on an MPLS backbone topology using GNS3, this topology includes configuration of several networking technologies such as IPv6, BGP, OSPF, IPv6 to IPv4 dynamic tunneling, MPLS based VPNs, MPLS based traffic engineering... So I'm a beginner with basic knowledge in networking (Ipv4 addressing, basic routing and switching) and I can't just easly test if my topology works or not, moreover fiddling with configuration I've noticed that sometimes when getting MPLS config right and missing BGP config all my topology is messed up. Given that I use Cisco 7200 series routers, is there any way to build a test harness for my topology in order to guarentee correctness with a single push button automated process?

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• How does an interpreter switch scope?

  - by Dox

  I'm asking this because I'm relatively new to interpreter development and I wanted to know some basic concepts before reinventing the wheel. I thought of the values of all variables stored in an array which makes the current scope, upon entering a function the array is swapped and the original array put on some sort of stack. When leaving the function the top element of the "scope stack" is popped of and used again. Is this basically right? Isn't swapping arrays (which means moving around a lot of data) not very slow and therefore not used by modern interpreters?

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• Can Ping but Cannot Telnet directly to SQL Server 2012 Cluster Nodes

  - by tresstylez

  We have a monitoring tool (Solarwinds Orion) that needs to connect to a 2-node failover SQL Server Cluster. For reasons outside of our control -- we cannot monitor the CLUSTER IP directly at this time, so we have fallen back to monitoring each cluster node IP directly. This is not working. Upon troubleshooting, we tried to test that the cluster node was listening on the proper (fixed) port by using telnet to the cluster node IP/port -- and the telnet failed. However, telnet'ing to the Cluster IP/Port was SUCCESSFUL! Each node has its own IP. Each node is listening on the identical FIXED port. Each node has Dynamic Ports disabled. Each node can be PINGED successfully from the monitoring tool. Windows Firewall is DISABLED. How can I troubleshoot why I cannot telnet to the listening port on the cluster nodes?

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• How to change hybrid disk to basic disk in windows 7?

  - by Marco

  I created a partition E and then deleted the partition. After that I extended my partition C (where OS was installed) to take the space. My partition C became hybrid drive. My hp notebook does not have DVD rom and the notebook only came with an recovery image (I also have a paragon disc image). My computer has some problems now and I want to recover it by either the factory format or the paragon disc image. However, none of them works. I know it is because my disc has become hybrid disk. My question is how to fix the dynamic disk problem?

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• How do I turn off caching in IIS7?

  - by jammus

  Hello. I'm developing an ASP classic site under Windows 7 (form a queue ladies). The problem is IIS seems to be heavily making use of its cache for both static and dynamic content which really conflicts with my 'make a small change, alt-tab, hit ctrl-F5' development style. Changes made to .asp files may take two or three refreshes to show up where as changes to .js files can take 20 times as many. How do I go about turning the caching off on my development machine? Cheers. in b4 stop using asp classic

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• Storing cvs data for further manipulation using Ruby

  - by ischnura

  I am dealing with a csv file that has some customer information (email, name, address, amount, [shopping_list: item 1, item 2]). I would like work with the data and produce some labels for printing... as well as to gather some extra information (total amounts, total items 1...) My main concern is to find the appropriate structure to store the data in ruby for future manipulation. For now I have thought about the following possibilities: multidimensional arrays: pretty simple to build, but pretty hard to access the data in a beautiful ruby way. hashes: having the email as key, and storing the information in different hashes (one hash for name, another hash for address, another hash for shopping list...) (getting the cvs data in to a Database and working with the data from ruby??) I would really appreciate your advice and guidance!!

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• How to store images efficiently (memory-wise) while still being able to process them

  - by Sheeo

  I'm working on a silverlight project where users get to create their own Collages. The problem When loading images into memory, I'm using BitmapImage so that they can be displayed directly with the Image control--but they're locked in afterwards. So I've tried storing them seperately aswell, but that just sucks up huge amounts of RAM. So in short, is there a class that'll let me store JPEG images, be able to show them with the image control, and still be able to export it afterwards? All this needs to be efficient--i.e. I'd rather not want any copying to ARGB arrays or use the WriteableBitmap to copy them over. I require to work with large collections of images, up to 300 at most. Any help apreciated!

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• How to get all n sets of three consecutives elements in an array or arraylist with a for statement ?

  - by newba

  Hi, I'm trying to do a convex hull approach and the little problem is that I need to get all sets of three consecutive vertices, like this: private void isConvexHull(Ponto[] points) { Arrays.sort(points); for (int i = 0; i <points.length; i++) { isClockWise(points[i],points[i+1],points[i+2]); } //... } I always do something that I don't consider clean code. Could please help me find one or more ways to this? I want it to be circular, i.e., if my fisrt point of the a set is the last element in the array, the 2nd element will be the 3rd in the list and the 3rd in that set will be the the 2nd element in the list, and so on. They must be consecutive, that's all.

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• .NET Web Service Proxy is adding special characters in XML

  - by xkingpin

  My web service proxy seems to be adding special characters like "*" and "#" etc. within the xml nodes. My proxy created lists using arrays of objects. I am trying to create a generic list and then doing list.ToArray() to set the proxy MyProxyObject[] object. Is this the cause of the problem I am having? I plan on running fiddler on the request later but it is over SSL and I do not have access to the URL at the moment. Here is an example of the XML that is generated: <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> * <soap:Body> o I'm a little concerned because the special characters are even occuring before the array nodes

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