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• What is the best way to archive data in a relational database?

  - by GenericTypeTea

  I have a bit of an issue with a particular aspect of a program I'm working on. I need the ability to archive (fix) a table so that a change anywhere in the system will not affect the results it returns. This is the basic structure of what I need to fix: Recipe --> Recipe (as sub recipe) Recipe --> Ingredients So, if I fix a Recipe, I need to ensure all the sub recipes (including all the sub recipes sub recipes and so forth) are fixed and all its ingredients are fixed. The problem is that the sub recipe and ingredients still need to be modifiable as they are used by other recipes that are not fixed. I came up with a solution whereby I serialize (with protobuf-net) a master object that deals with the recipe and all the sub recipes and ingredients and save the archive data to a table like follows: Archive{ ReferenceId, (i.e. RecipeId) ReferenceTypeId, (i.e. Recipe) ArchiveData varbinary(max) } Now, this works great and is almost perfect... however I totally forgot (I'd love to blame the agile development mentally, however this was just short sighted) that this information needs to be reported on. As far as I'm aware I can't think how I could inflate the serialized data back into my Recipe Object and use it in a Report. I'm using the standard SQL 2005 report services at the moment. Alternatively, I guess I could do the following: Duplicate every table and tag the word "Archive" on the end of the table name. This would then give me an area of specific archive data... but ignoring my simplified example, there'd actually be about 15 tables duplicated. Add a nullable, non-foreign key property called "CopiedFromId" to every table that contains fixed data and duplicate every record that the recipe (and all it's sub recipes and all their sub recipes) touches. Create some sort of denormalised structure that could be restored from at a later date to the original, unfixed recipe. Although I think this would be like option 1 and involve a lot of extra tables. Anyway, I'm at a total loss and do not like any of the ideas particularly. Can anyone please advise the best course of action? EDIT: Or 4) Create tables specific to what the report requires and populate them with the data when the user clicks the report button? This would cause about 4 extra tables for the report in question.

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• How do you make a Custom Data Generator for SQL XML DataType.

  - by Keith Sirmons

  Howdy, I am using Visual Studio 2010 and am playing around with the Database Projects. I am creating a DataGenerationPlan to insert data into a simple table, in which one of the column datatypes is XML. Out of the box, the generation plan uses the Regular Expression generator and generates something like this : HGcSv9wa7yM44T9x5oFT4pmBkEmv62lJ7OyAmCnL6yqXC2X.......... I am looking at creating a custom data Generator for this data type and have followed this site for the basics: http://msdn.microsoft.com/en-us/library/aa833244.aspx This example works if I am creating a string datatype and using it for a nvarchar datatype. What do I need to change to hook this Generator to the XML Datatype? Below are my code files. The string property works for nvarchar. The XElement property does not work for the xml datatype, and the RecordXMLDataGenerator is not listed as an option in the Generator column for the generation plan. CustomDataGenerators: using System; using System.Collections.Generic; using System.Linq; using System.Text; using Microsoft.Data.Schema.Tools.DataGenerator; using Microsoft.Data.Schema.Extensibility; using Microsoft.Data.Schema; using Microsoft.Data.Schema.Sql; using System.Xml.Linq; namespace CustomDataGenerators { [DatabaseSchemaProviderCompatibility(typeof(SqlDatabaseSchemaProvider))] public class RecordXMLDataGenerator : Generator { private XElement _RecordData; [Output(Description = "Generates string of XML Data for the Record.", Name = "RecordDataString")] public string RecordDataString { get { return _RecordData.ToString(SaveOptions.None); } } [Output(Description = "Generates XML Data for the Record.", Name = "RecordData")] public XElement RecordData { get { return _RecordData; } } protected override void OnGenerateNextValues() { base.OnGenerateNextValues(); XElement element = new XElement("Root", new XElement("Children1", 1), new XElement("Children6", 6) ); _RecordData = element; } } } XML Extensions File: <?xml version="1.0" encoding="utf-8" ?> <extensions assembly="" version="1" xmlns="urn:Microsoft.Data.Schema.Extensions" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:Microsoft.Data.Schema.Extensions Microsoft.Data.Schema.Extensions.xsd"> <extension type="CustomDataGenerators.RecordXMLDataGenerator" assembly="CustomDataGenerators, Version=1.0.0.0, Culture=neutral, PublicKeyToken=xxxxxxxxxxxx" enabled="true"/> </extensions> Table.sql: CREATE TABLE [dbo].[Record] ( id int IDENTITY (1,1) NOT NULL, recordData xml NULL, userId int NULL, test nvarchar(max) NULL, rowver rowversion NULL, CONSTRAINT pk_RecordID PRIMARY KEY (id) )

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• G++, compiler warnings, c++ templates

  - by Ian

  During the compilatiion of the C++ program those warnings appeared: c:/MinGW/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/bc:/MinGW/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/bits/stl_algo.h:2317: instantiated from `void std::partial_sort(_RandomAccessIterator, _RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<Object<double>**, std::vector<Object<double>*, std::allocator<Object<double>*> > >, _Compare = sortObjects<double>]' c:/MinGW/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/bits/stl_algo.h:2506: instantiated from `void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<Object<double>**, std::vector<Object<double>*, std::allocator<Object<double>*> > >, _Size = int, _Compare = sortObjects<double>]' c:/MinGW/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/bits/stl_algo.h:2589: instantiated from `void std::sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<Object<double>**, std::vector<Object<double>*, std::allocator<Object<double>*> > >, _Compare = sortObjects<double>]' io/../structures/objects/../../algorithm/analysis/../../structures/list/ObjectsList.hpp:141: instantiated from `void ObjectsList <T>::sortObjects(unsigned int, T, T, T, T, unsigned int) [with T = double]' I do not why, because all objects have only template parameter T, their local variables are also T. The only place, where I am using double is main. There are objects of type double creating and adding into the ObjectsList... Object <double> o1; ObjectsList <double> olist; olist.push_back(o1); .... T xmin = ..., ymin = ..., xmax = ..., ymax = ...; unsigned int n = ...; olist.sortAllObjects(xmin, ymin, xmax, ymax, n); and comparator template <class T> class sortObjects { private: unsigned int n; T xmin, ymin, xmax, ymax; public: sortObjects ( const T xmin_, const T ymin_, const T xmax_, const T ymax_, const int n_ ) : xmin ( xmin_ ), ymin ( ymin_ ), xmax ( xmax_ ), ymax ( ymax_ ), n ( n_ ) {} bool operator() ( const Object <T> *o1, const Object <T> *o2 ) const { T dmax = (std::max) ( xmax - xmin, ymax - ymin ); T x_max = ( xmax - xmin ) / dmax; T y_max = ( ymax - ymin ) / dmax; ... return ....; } representing ObjectsList method: template <class T> void ObjectsList <T> ::sortAllObjects ( const T xmin, const T ymin, const T xmax, const T ymax, const unsigned int n ) { std::sort ( objects.begin(), objects.end(), sortObjects <T> ( xmin, ymin, xmax, ymax, n ) ); }

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• How do I print out objects in an array in python?

  - by Jonathan

  I'm writing a code which performs a k-means clustering on a set of data. I'm actually using the code from a book called collective intelligence by O'Reilly. Everything works, but in his code he uses the command line and i want to write everything in notepad++. As a reference his line is >>>kclust=clusters.kcluster(data,k=10) >>>[rownames[r] for r in k[0]] Here is my code: from PIL import Image,ImageDraw def readfile(filename): lines=[line for line in file(filename)] # First line is the column titles colnames=lines[0].strip( ).split('\t')[1:] rownames=[] data=[] for line in lines[1:]: p=line.strip( ).split('\t') # First column in each row is the rowname rownames.append(p[0]) # The data for this row is the remainder of the row data.append([float(x) for x in p[1:]]) return rownames,colnames,data from math import sqrt def pearson(v1,v2): # Simple sums sum1=sum(v1) sum2=sum(v2) # Sums of the squares sum1Sq=sum([pow(v,2) for v in v1]) sum2Sq=sum([pow(v,2) for v in v2]) # Sum of the products pSum=sum([v1[i]*v2[i] for i in range(len(v1))]) # Calculate r (Pearson score) num=pSum-(sum1*sum2/len(v1)) den=sqrt((sum1Sq-pow(sum1,2)/len(v1))*(sum2Sq-pow(sum2,2)/len(v1))) if den==0: return 0 return 1.0-num/den class bicluster: def __init__(self,vec,left=None,right=None,distance=0.0,id=None): self.left=left self.right=right self.vec=vec self.id=id self.distance=distance def hcluster(rows,distance=pearson): distances={} currentclustid=-1 # Clusters are initially just the rows clust=[bicluster(rows[i],id=i) for i in range(len(rows))] while len(clust)>1: lowestpair=(0,1) closest=distance(clust[0].vec,clust[1].vec) # loop through every pair looking for the smallest distance for i in range(len(clust)): for j in range(i+1,len(clust)): # distances is the cache of distance calculations if (clust[i].id,clust[j].id) not in distances: distances[(clust[i].id,clust[j].id)]=distance(clust[i].vec,clust[j].vec) #print 'i' #print i #print #print 'j' #print j #print d=distances[(clust[i].id,clust[j].id)] if d<closest: closest=d lowestpair=(i,j) # calculate the average of the two clusters mergevec=[ (clust[lowestpair[0]].vec[i]+clust[lowestpair[1]].vec[i])/2.0 for i in range(len(clust[0].vec))] # create the new cluster newcluster=bicluster(mergevec,left=clust[lowestpair[0]], right=clust[lowestpair[1]], distance=closest,id=currentclustid) # cluster ids that weren't in the original set are negative currentclustid-=1 del clust[lowestpair[1]] del clust[lowestpair[0]] clust.append(newcluster) return clust[0] def kcluster(rows,distance=pearson,k=4): # Determine the minimum and maximum values for each point ranges=[(min([row[i] for row in rows]),max([row[i] for row in rows])) for i in range(len(rows[0]))] # Create k randomly placed centroids clusters=[[random.random( )*(ranges[i][1]-ranges[i][0])+ranges[i][0] for i in range(len(rows[0]))] for j in range(k)] lastmatches=None for t in range(100): print 'Iteration %d' % t bestmatches=[[] for i in range(k)] # Find which centroid is the closest for each row for j in range(len(rows)): row=rows[j] bestmatch=0 for i in range(k): d=distance(clusters[i],row) if d<distance(clusters[bestmatch],row): bestmatch=i bestmatches[bestmatch].append(j) # If the results are the same as last time, this is complete if bestmatches==lastmatches: break lastmatches=bestmatches # Move the centroids to the average of their members for i in range(k): avgs=[0.0]*len(rows[0]) if len(bestmatches[i])>0: for rowid in bestmatches[i]: for m in range(len(rows[rowid])): avgs[m]+=rows[rowid][m] for j in range(len(avgs)): avgs[j]/=len(bestmatches[i]) clusters[i]=avgs return bestmatches

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• Problem in loading cities using JSON

  - by Saravanan I M

  I am using Geonames for loading the cities using JSON. Geonames data i imported into my database. I am using MS SQL 2008 Server. I display a dropdown for country select. Once the user select the country. I am loading all the cities into the autocomplete textbox. I am facing a delay in the getJSON method. Also it seems like executing asynchronous. So before getting all the data my autocompelte is getting filled. Below is my complete script. I think i have some problem in the loop. Please advice me what i am doing wrong in my code. $(document).ready(function () { $("#ShowLoad").hide(); //Hook onto the MakeID list's onchange event $("#Country").change(function () { findcities = []; $("#ShowLoad").show(); $("#HomeTown").unautocomplete(); var url = '<%= Url.Content("~/") %>' + "Location/GetCitiesCountByCountry/" + $("#Country").val(); $.getJSON(url, null, function (data) { var total = data; if (total > 0) { var pageTotal = Math.ceil(total / 1000); var isFilled = false; for (var i = 0; i < pageTotal; i++) { var skip = i == 1 ? 0 : (i * 1000) - 1000; var url = '<%= Url.Content("~/") %>' + "Location/GetCitiesByCountry/" + $("#Country").val() + "?skip=" + skip; //alert(i); $.getJSON(url, null, function (data) { $.each(data.Cities, function (index, optionData) { if ($("#Country").val() == "US") { findcities.push(optionData.asciiname + "," + optionData.admin1_code); } else { findcities.push(optionData.asciiname); } }); if (i == pageTotal) { //alert(findcities); $("#ShowLoad").hide(); $("#HomeTown").focus().autocomplete(findcities); } }); } $("#HomeTown").setOptions({ max: 100000 }); } }); }).change(); });

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• Using multiple aggregate functions in an algebraic expression in (ANSI) SQL statement

  - by morpheous

  I have the following aggregate functions (AGG FUNCs): foo(), foobar(), fredstats(), barneystats(). I want to know if I can use multiple AGG FUNCs in an algebraic expression. This may seem a strange/simplistic question for seasoned SQL developers - however, the but the reason I ask is that so far, all AGG FUNCs examples I have seen are of the simplistic variety e.g. max(salary) < 100, rather than using the AGG FUNCs in an expression which involves using multiple AGG FUNCs in an expression (like agg_func1() agg_func2()). The information below should help clarify further. Given tables with the following schemas: CREATE TABLE item (id int, length float, weight float); CREATE TABLE item_info (item_id, name varchar(32)); # Is it legal (ANSI) SQL to write queries of this format ? SELECT id, name, foo, foobar, fredstats FROM A, B (SELECT id, foo(123) as foo, foobar('red') as foobar, fredstats('weight') as fredstats FROM item GROUP BY id HAVING [ALGEBRAIC EXPRESSION] ORDER BY id AS A), item_info AS B WHERE item.id = B.id Where: ALGEBRAIC EXPRESSION is the type of expression that can be used in a WHERE clause - for example: ((foo(x) < foobar(y)) AND foobar(y) IN (1,2,3)) OR (fredstats(x) <> 0)) I am using PostgreSQL as the db, but I would prefer to use ANSI SQL wherever possible. Assuming it is legal to include AGG FUNCS in the way I have done above, I'd like to know: Is there a more efficient way to write the above query ? Is there any way I can speed up the query in terms of a judicious choice of indexes on the tables item and item_info ? Is there a performance hit of using AGG FUNCs in an algebraic expression like I am (i.e. an expression involving the output of aggregate functions rather than constants? Can the expression also include 'scaled' AGG FUNC? (for example: 2*foo(123) < -3*foobar(456) ) - will scaling (i.e. multiplying an AGG FUNC by a number have an effect on performance?) How can I write the query above using INNER JOINS instead?

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• Choosing a distributed shared memory solution

  - by mindas

  I have a task to build a prototype for a massively scalable distributed shared memory (DSM) app. The prototype would only serve as a proof-of-concept, but I want to spend my time most effectively by picking the components which would be used in the real solution later on. The aim of this solution is to take data input from an external source, churn it and make the result available for a number of frontends. Those "frontends" would just take the data from the cache and serve it without extra processing. The amount of frontend hits on this data can literally be millions per second. The data itself is very volatile; it can (and does) change quite rapidly. However the frontends should see "old" data until the newest has been processed and cached. The processing and writing is done by a single (redundant) node while other nodes only read the data. In other words: no read-through behaviour. I was looking into solutions like memcached however this particular one doesn't fulfil all our requirements which are listed below: The solution must at least have Java client API which is reasonably well maintained as the rest of app is written in Java and we are seasoned Java developers; The solution must be totally elastic: it should be possible to add new nodes without restarting other nodes in the cluster; The solution must be able to handle failover. Yes, I realize this means some overhead, but the overall served data size isn't big (1G max) so this shouldn't be a problem. By "failover" I mean seamless execution without hardcoding/changing server IP address(es) like in memcached clients when a node goes down; Ideally it should be possible to specify the degree of data overlapping (e.g. how many copies of the same data should be stored in the DSM cluster); There is no need to permanently store all the data but there might be a need of post-processing of some of the data (e.g. serialization to the DB). Price. Obviously we prefer free/open source but we're happy to pay a reasonable amount if a solution is worth it. In any way, paid 24hr/day support contract is a must. The whole thing has to be hosted in our data centers so SaaS offerings like Amazon SimpleDB are out of scope. We would only consider this if no other options would be available. Ideally the solution would be strictly consistent (as in CAP); however, eventual consistence can be considered as an option. Thanks in advance for any ideas.

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• Using IoC and Dependency Injection, how do I wrap an existing implementation with a new layer of imp

  - by Dividnedium

  I'm trying to figure out how this would be done in practice, so as not to violate the Open Closed principle. Say I have a class called HttpFileDownloader that has one function that takes a url and downloads a file returning the html as a string. This class implements an IFileDownloader interface which just has the one function. So all over my code I have references to the IFileDownloader interface and I have my IoC container returning an instance of HttpFileDownloader whenever an IFileDownloader is Resolved. Then after some use, it becomes clear that occasionally the server is too busy at the time and an exception is thrown. I decide that to get around this, I'm going to auto-retry 3 times if I get an exception, and wait 5 seconds in between each retry. So I create HttpFileDownloaderRetrier which has one function that uses HttpFileDownloader in a for loop with max 3 loops, and a 5 second wait between each loop. So that I can test the "retry" and "wait" abilities of the HttpFileDownloadRetrier I have the HttpFileDownloader dependency injected by having the HttpFileDownloaderRetrier constructor take an IFileDownloader. So now I want all Resolving of IFileDownloader to return the HttpFileDownloaderRetrier. But if I do that, then HttpFileDownloadRetrier's IFileDownloader dependency will get an instance of itself and not of HttpFileDownloader. So I can see that I could create a new interface for HttpFileDownloader called IFileDownloaderNoRetry, and change HttpFileDownloader to implement that. But that means I'm changing HttpFileDownloader, which violates Open Closed. Or I could implement a new interface for HttpFileDownloaderRetrier called IFileDownloaderRetrier, and then change all my other code to refer to that instead of IFileDownloader. But again, I'm now violating Open Closed in all my other code. So what am I missing here? How do I wrap an existing implementation (downloading) with a new layer of implementation (retrying and waiting) without changing existing code? Here's some code if it helps: public interface IFileDownloader { string Download(string url); } public class HttpFileDownloader : IFileDownloader { public string Download(string url) { //Cut for brevity - downloads file here returns as string return html; } } public class HttpFileDownloaderRetrier : IFileDownloader { IFileDownloader fileDownloader; public HttpFileDownloaderRetrier(IFileDownloader fileDownloader) { this.fileDownloader = fileDownloader; } public string Download(string url) { Exception lastException = null; //try 3 shots of pulling a bad URL. And wait 5 seconds after each failed attempt. for (int i = 0; i < 3; i++) { try { fileDownloader.Download(url); } catch (Exception ex) { lastException = ex; } Utilities.WaitForXSeconds(5); } throw lastException; } }

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• IE 8: Object Expected for Every Javascript Function

  - by Yetkin EREN

  Hi; Moz say's everything is ok! IE say's object expected everywhere.. for example this my make a box function (in all.js file); function kutuyap(Eid,iduzan,text,yer,ekle){ var div; if (document.createElement && (div = document.createElement('div'))) { div.name = div.id = Eid+iduzan; document.getElementById(yer).appendChild(div); } //$('#'+yer).append("<div id="+Eid+iduzan+"></div>") $('#'+Eid+iduzan).addClass("minikutu"); $('#'+Eid+iduzan).html("&nbsp;"+text+'<span id='+Eid+'y'+iduzan+' class="yokedici">X</span>'); $("#"+Eid+'y'+iduzan).attr("onclick","kutusil('"+Eid+"y"+iduzan+"','"+iduzan+"','"+ekle+"');"); $('#'+ekle).val($('#'+ekle).val()+Eid+'-'); } and after that i call function like this; HTML; <select name="Mturs" class="inputs" id="Mturs"> <option value="0" selected="selected">Choise One</option> <option value="4">Pop</option> <option value="3">Pop-Rock </option> <option value="5">Rock (Yabanci)</option> </select> <input name="secMtur" id="secMtur" value="" type="hidden"> <script> $('#Mturs').live('change', function() { $('#Mturs :selected').each(function (i) { if ( $('#Mturs :selected').val() != 0 ) { secMturde=$('#secMtur').val().indexOf($('#Mturs :selected').val()+'-'); splitter=$('#secMtur').val().split("-") if(splitter.length<=12){ if (secMturde<0) { kutuyap($('#Mturs :selected').val(),'mtur',$(this).html(),'divmtur','secMtur'); }else{ alert("Choisen before") } }else{ alert("Max limit is 12 !") } } }); }); </script> sory for my realy bad english.. edit: and i have this tags; <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" /> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.1/jquery.min.js"> </script> <script type="text/javascript" src="alljs.js"></script>

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• Unrequired property keeps getting data-val-required attribute

  - by frennky

  This is the model with it's validation: [MetadataType(typeof(TagValidation))] public partial class Tag { } public class TagValidation { [Editable(false)] [HiddenInput(DisplayValue = false)] public int TagId { get; set; } [Required] [StringLength(20)] [DataType(DataType.Text)] public string Name { get; set; } //... } Here is the view: <h2>Create</h2> <script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script> <script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script> @using (Html.BeginForm()) { @Html.ValidationSummary(true) <fieldset> <legend>Tag</legend> <div>@Html.EditorForModel()</div> <p> <input type="submit" value="Create" /> </p> </fieldset> } <div> @Html.ActionLink("Back to List", "Index") </div> And here is what get's renderd: <form action="/Tag/Create" method="post"> <fieldset> <legend>Tag</legend> <div><input data-val="true" data-val-number="The field TagId must be a number." data-val-required="The TagId field is required." id="TagId" name="TagId" type="hidden" value="" /> <div class="editor-label"><label for="Name">Name</label></div> <div class="editor-field"><input class="text-box single-line" data-val="true" data-val-length="The field Name must be a string with a maximum length of 20." data-val-length-max="20" data-val-required="The Name field is required." id="Name" name="Name" type="text" value="" /> <span class="field-validation-valid" data-valmsg-for="Name" data-valmsg-replace="true"></span></div> ... </fieldset> </form> The problem is that TagId validation gets generated althoug thare is no Required attribute set on TagId property. Because of that I can't even pass the client-side validation in order to create new Tag in db. What am I missing?

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• How to initiate chatting between two clients and two clients only, using applets and servlets?

  - by mithun1538

  Hello everyone, I first need to apologize for my earlier questions. (You can check my profile for them)They seemed to ask more questions than give answers. Hence, I am laying down the actual question that started all them absurd questions. I am trying to design a chat applet. Till now, I have coded the applet, servlet and communication between the applet and the servlet. The code in the servlet side is such that I was able to establish chatting between clients using the applets, but the code was more like a broadcast all feature, i.e. all clients would be chatting with each other. That was my first objective when I started designing the chat applet. The second step is chatting between only two specific users, much like any other chat application we have. So this was my idea for it: I create an instance of the servlet that has the 'broadcast-all' code. I then pass the address of this instance to the respective clients. 2 client applets use the address to then chat. Technically the code is 'broadcast-all', but since only 2 clients are connected to it, it gives the chatting between two clients feature. Thus, groups of 2 clients have different instances of the same servlet, and each instance handles chatting between two clients at a max. However, as predicted, the idea didn't materialize! I tried to create an instance of the servlet but the only solution for that was using sessions on the servlet side, and I don't know how to use this session for later communications. I then tried to modify my broadcast-all code. In that code, I was using classes that implemented Observer and Observable interfaces. So the next idea that I got was: Create a new object of the Observable class(say class_1). This object be common to 2 clients. 2 clients that wish to chat will use same object of the class_1. 2 other clients will use a different object of class_1. But the problem here lies with the class that implements the Observer interface(say class_2). Since this has observers monitoring the same type of class, namely class_1, how do I establish an observer monitoring one object of class_1 and another observer monitoring another object of the same class class_1 (Because notifyObservers() would notify all the observers and I can't assign a particular observer to a particular object)? I first decided to ask individual problems, like how to create instances of servlets, using objects of observable and observer and so on in stackoverflow... but I got confused even more. Can anyone give me an idea how to establish chatting between two clients only?(I am using Http and not sockets or RMI). Regards, Mithun. P.S. Thanks to all who replied to my previous (absurd) queries. I should have stated the purpose earlier so that you guys could help me better.

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• one page has 9 urls. I am looking for 301 auto redirect syntax for multiple urls.

  - by Ali Demirtas

  Hi This is the third time I am asking this question. I am only looking for the syntax of how to solve this problem. I am using prestashop as the cart for my website. I have a problem; the website used to be in dynamic urls. I enabled friendly url writing. The problem is that one page has more than one url. You can access a same page from the dynamic url and static url. In fact a single page has 9 different urls. This obviously creates problems for seo as search engines penalize my website for this. Here are examples of a page with more than 2 urls (http://www.turkishfootballstore.com/lang-nl/product.php?id_product=515) (http://www.turkishfootballstore.com/fenerbahce/515-fenerbahce-thuisshirt-20092010.html) (http://www.turkishfootballstore.com/lang-nl/fenerbahce/515-fenerbahce-thuisshirt-20092010.html) you can see even the static url's have 2 one with language defined and the other without. out fo the three urls above the correct one is the one at the bottom. What can I do to solve this problem? I have no knowledge of programming. Here is the htaccess for the website. Any sample code or help is really appreciated. There is 550 pages and every page is published in 17 different languages I want to use a 301 auto redirect. What is the simplest way to do it? Please only reply if you have the coding for a auto 301 redirect! URL rewriting module activation RewriteEngine on URL rewriting rules RewriteRule ^([a-z0-9]+)-([a-z0-9]+)(-[_a-zA-Z0-9-]*)/([_a-zA-Z0-9-]*).jpg$ /img/p/$1-$2$3.jpg [L,E] RewriteRule ^([0-9]+)-([0-9]+)/([_a-zA-Z0-9-]*).jpg$ /img/p/$1-$2.jpg [L,E] RewriteRule ^([0-9]+)(-[_a-zA-Z0-9-]*)/([_a-zA-Z0-9-]).jpg$ /img/c/$1$2.jpg [L,E] RewriteRule ^lang-([a-z]{2})/([a-zA-Z0-9-])/([0-9]+)-([a-zA-Z0-9-]).html(.)$ /product.php?id_product=$3&isolang=$1$5 [L,E] RewriteRule ^lang-([a-z]{2})/([0-9]+)-([a-zA-Z0-9-]).html(.)$ /product.php?id_product=$2&isolang=$1$4 [L,E] RewriteRule ^lang-([a-z]{2})/([0-9]+)-([a-zA-Z0-9-])(.)$ /category.php?id_category=$2&isolang=$1 [QSA,L,E] RewriteRule ^([a-zA-Z0-9-])/([0-9]+)-([a-zA-Z0-9-]).html(.*)$ /product.php?id_product=$2$4 [L,E] RewriteRule ^([0-9]+)-([a-zA-Z0-9-]).html(.)$ /product.php?id_product=$1$3 [L,E] RewriteRule ^([0-9]+)-([a-zA-Z0-9-])(.)$ /category.php?id_category=$1 [QSA,L,E] RewriteRule ^content/([0-9]+)-([a-zA-Z0-9-])(.)$ /cms.php?id_cms=$1 [QSA,L,E] RewriteRule ^([0-9]+)__([a-zA-Z0-9-])(.)$ /supplier.php?id_supplier=$1$3 [QSA,L,E] RewriteRule ^([0-9]+)_([a-zA-Z0-9-])(.)$ /manufacturer.php?id_manufacturer=$1$3 [QSA,L,E] RewriteRule ^lang-([a-z]{2})/(.*)$ /$2?isolang=$1 [QSA,L,E] Catch 404 errors ErrorDocument 404 /404.php Options +FollowSymLinks RewriteEngine on RewriteCond %{HTTP_HOST} ^.com [NC] RewriteRule ^(.)$ http://www.*.com/$1 [L,R=301] Options +FollowSymLinks RewriteEngine on index.php to / RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /.index.php\ HTTP/ RewriteRule ^(.)index.php$ /$1 [R=301,L] Header set Cache-Control: "no-store, no-cache, must-revalidate, pre-check=0, post-check=0, max-age=0"

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• How can I limit the cache used by copying so there is still memory available for other cache?

  - by Peter

  Basic situation: I am copying some NTFS disks in openSuSE. Each one is 2TB. When I do this, the system runs slow. My guesses: I believe it is likely due to caching. Linux decides to discard useful cache (eg. kde4 bloat, virtual machine disks, LibreOffice binaries, Thunderbird binaries, etc.) and instead fill all available memory (24 GB total) with stuff from the copying disks, which will be read only once, then written and never used again. So then any time I use these apps (or kde4), the disk needs to be read again, and reading the bloat off the disk again makes things freeze/hiccup. Due to the cache being gone and the fact that these bloated applications need lots of cache, this makes the system horribly slow. Since it is USB,the disk and disk controller are not the bottleneck, so using ionice does not make it faster. I believe it is the cache rather than just the motherboard going too slow, because if I stop everything copying, it still runs choppy for a while until it recaches everything. And if I restart the copying, it takes a minute before it is choppy again. But also, I can limit it to around 40 MB/s, and it runs faster again (not because it has the right things cached, but because the motherboard busses have lots of extra bandwidth for the system disks). I can fully accept a performance loss from my motherboard's IO capability being completely consumed (which is 100% used, meaning 0% wasted power which makes me happy), but I can't accept that this caching mechanism performs so terribly in this specific use case. # free total used free shared buffers cached Mem: 24731556 24531876 199680 0 8834056 12998916 -/+ buffers/cache: 2698904 22032652 Swap: 4194300 24764 4169536 I also tried the same thing on Ubuntu, which causes a total system hang instead. ;) And to clarify, I am not asking how to leave memory free for the "system", but for "cache". I know that cache memory is automatically given back to the system when needed, but my problem is that it is not reserved for caching of specific things. Question: Is there some way to tell these copy operations to limit memory usage so some important things remain cached, and therefore any slowdowns are a result of normal disk usage and not rereading the same commonly used files? For example, is there a setting of max memory per process/user/file system allowed to be used as cache/buffers?

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• Saving image to database as varbinary, arraylength (part 2)

  - by Thomas Schoof

  This is a followup to my previous question, which got solved (thank you for that) but now I am stuck at another error. I'm trying to save an image in my database (called 'Afbeelding'), for that I made a table which excists of: id: int souce: varbinary(max) I then created a wcf service to save an 'Afbeelding' to the database. private static DataClassesDataContext dc = new DataClassesDataContext(); [OperationContract] public void setAfbeelding(Afbeelding a) { //Afbeelding a = new Afbeelding(); //a.id = 1; //a.source = new Binary(bytes); dc.Afbeeldings.InsertOnSubmit(a); dc.SubmitChanges(); } I then put a reference to the service in my project and when I press the button I try to save it to the datbase. private void btnUpload_Click(object sender, RoutedEventArgs e) { Afbeelding a = new Afbeelding(); OpenFileDialog openFileDialog = new OpenFileDialog(); openFileDialog.Filter = "JPEG files|*.jpg"; if (openFileDialog.ShowDialog() == true) { //string imagePath = openFileDialog.File.Name; //FileStream fileStream = new FileStream(imagePath, FileMode.Open, FileAccess.Read); //byte[] buffer = new byte[fileStream.Length]; //fileStream.Read(buffer, 0, (int)fileStream.Length); //fileStream.Close(); Stream stream = (Stream)openFileDialog.File.OpenRead(); Byte[] bytes = new Byte[stream.Length]; stream.Read(bytes, 0, (int)stream.Length); string fileName = openFileDialog.File.Name; a.id = 1; a.source = new Binary { Bytes = bytes }; } EditAfbeeldingServiceClient client = new EditAfbeeldingServiceClient(); client.setAfbeeldingCompleted +=new EventHandler<System.ComponentModel.AsyncCompletedEventArgs>(client_setAfbeeldingCompleted); client.setAfbeeldingAsync(a); } void client_setAfbeeldingCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e) { if (e.Error != null) txtEmail.Text = e.Error.ToString(); else MessageBox.Show("WIN"); } However, when I do this, I get the following error: System.ServiceModel.FaultException: The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameter :a. The InnerException message was 'There was an error deserializing the object of type OndernemersAward.Web.Afbeelding. The maximum array length quota (16384) has been exceeded while reading XML data. This quota may be increased by changing the MaxArrayLength property on the XmlDictionaryReaderQuotas object used when creating the XML reader.'. Please see InnerException for more details. at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc) at System.ServiceModel.Channels.ServiceChannel.EndCall(String action, Object[] outs, IAsyncResult result) at System.ServiceModel.ClientBase`1.ChannelBase`1.EndInvoke(String methodName, Object[] args, IAsyncResult result) atOndernemersAward.EditAfbeeldingServiceReference.EditAfbeeldingServiceClient.EditAfbeeldingServiceClientChannel.EndsetAfbeelding(IAsyncResult result) at OndernemersAward.EditAfbeeldingServiceReference.EditAfbeeldingServiceClient.OndernemersAward.EditAfbeeldingServiceReference.EditAfbeeldingService.EndsetAfbeelding(IAsyncResult result) at OndernemersAward.EditAfbeeldingServiceReference.EditAfbeeldingServiceClient.OnEndsetAfbeelding(IAsyncResult result) at System.ServiceModel.ClientBase`1.OnAsyncCallCompleted(IAsyncResult result) I'm not sure what's causing this but I think it has something to do with the way I write the image to the database? (The array length is too big big, I don't really know how to change it) Thank you for your help, Thomas

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• Javascript & Jquery why it doesnt work on IE?

  - by Yetkin EREN

  i cant run any function on ie this is a little part; my test page : http://www.yetkineren.com/testpage.html code: <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" /> <title>test page</title> </head> <body> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.1/jquery.min.js"> </script> <script type="text/javascript" language="javascript"> function kutuyap(Eid,iduzan,yazi,yer,ekle){ var div; div = document.createElement('div') div.id = Eid+iduzan; document.getElementById(yer).appendChild(div); //$('#'+yer).append("<div id="+Eid+iduzan+"></div>") $('#'+Eid+iduzan).addClass("minikutu"); $('#'+Eid+iduzan).html(" "+yazi+'<span id='+Eid+'y'+iduzan+' class="yokedici">X</span>'); // $("#"+Eid+'y'+iduzan).attr("onclick","kutusil('"+Eid+"y"+iduzan+"','"+iduzan+"','"+ekle+"');"); $("#"+Eid+'y'+iduzan).click(function() { kutusil(Eid+'y'+iduzan, iduzan, ekle); }); $('#'+ekle).val($('#'+ekle).val()+Eid+'-'); } function kutusil(Eid,iduzan,ekle){ $('#'+Eid).live('click',function() { sil=$(this).parents("div:first").attr("id"); silinecek=sil.replace(iduzan,''); $('#'+ekle).val($('#'+ekle).val().replace(silinecek+'-','')); $(this).parents("div:first").remove(); }); } </script> <select name="Mturs" class="inputs" id="Mturs"> <option value="0" selected="selected">Choise One</option> <option value="4">Pop</option> <option value="3">Pop-Rock </option> <option value="5">Rock (Yabanci)</option> </select> <input name="secMtur" id="secMtur" value="" type="hidden"> <script> $('#Mturs').live('change', function() { $('#Mturs :selected').each(function (i) { if ( $('#Mturs :selected').val() != 0 ) { secMturde=$('#secMtur').val().indexOf($('#Mturs :selected').val()+'-'); splitter=$('#secMtur').val().split("-") if(splitter.length<=12){ if (secMturde<0) { kutuyap($('#Mturs :selected').val(),'mtur',$(this).html(),'divmtur','secMtur'); }else{ alert("Choisen before") } }else{ alert("Max limit is 12 !") } } }); }); </script>

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• CSS - changing the font color for a from select option in firefox

  - by Mick

  I'm building a website for my church, and I'm teaching myself all about web design along the way. http://www.wilmingtonchurchofgod.org/contact_us.html is the link where you can see my issue. If you look at that page in firefox, and you click the select part of the form (next to, "Who would you like to contact?") you will see that when you hover over a choice, the font is white. I have tried various things to fix this, but can't find a solution. This seems to be specific to Firefox. Here is the relevant CSS. input, textarea, select, option{ padding: 6px; border: solid 1px #E5E5E5; outline: 0; font: normal 13px/100% Verdana, Tahoma, sans-serif; width: 200px; background: #FFFFFF url(images/from-grad.jpg) left top repeat-x; background: -webkit-gradient(linear, left top, left 25, from(#FFFFFF), color-stop(4%, #EEEEEE), to(#FFFFFF)); background: -moz-linear-gradient(top, #FFFFFF, #EEEEEE 1px, #FFFFFF 25px); box-shadow: rgba(0,0,0, 0.15) 0px 0px 8px; -moz-box-shadow: rgba(0,0,0, 0.15) 0px 0px 8px; -webkit-box-shadow: rgba(0,0,0, 0.15) 0px 0px 8px; } option{ padding:0px; } textarea { width: 400px; max-width: 400px; height: 150px; line-height: 150%; } input:hover, textarea:hover, input:focus, textarea:focus{ border-color: #C9C9C9; -webkit-box-shadow: rgba(0, 0, 0, 0.15) 0px 0px 8px; -moz-box-shadow: rgba(0,0,0, 0.15) 0px 0px 8px; } option:hover, option:focus, select:hover, select:focus { color: black; border-color: #C9C9C9; -webkit-box-shadow: rgba(0, 0, 0, 0.15) 0px 0px 8px; -moz-box-shadow: rgba(0,0,0, 0.15) 0px 0px 8px; } Another side note is that I can't get any background gradient at all to show up on Google Chome (yet it does on Safari and they are supposed to use the same kit?) Any help with these two things would be greatly appreciated.

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• Please help me debug my SQL query.

  - by bob09

  I have a query: Select n_portions, dish_name from food_order, dish where n_portions= (select max (n_portions) FROM food_order); It's meant to return: fish pie 3 steak and chips 1 pasta bake 2 stuffed peppers 1 But i get: Pasta bake 35 Fish pie 35 Steak and chips 35 Stuffed peppers 35 Ham and rice 35 Lamb curry 35 Why is this happing? table data table data Insert into customer_order values ('00001', '03-Apr-09', '07-apr-09','St. Andrew St'); Insert into customer_order values ('00002', '05-Apr-09', '01-May-09', 'St. Andrew St'); Insert into customer_order values ('00003', '12-Apr-09', '27-Apr-09', 'Union St'); Insert into customer_order values ('00004', '12-Apr-09', '17-Apr-09', 'St. Andrew St'); Insert into Dish values ('D0001', 'Pasta bake', 'yes', '6.00'); Insert into Dish values ('D0002', 'Fish pie', 'no', '9.00'); Insert into Dish values ('D0003', 'Steak and chips', 'no', '14.00'); Insert into Dish values ('D0004', 'Stuffed peppers', 'yes', '11.50'); Insert into Dish values ('D0005', 'Ham and rice' , 'no', '7.25'); Insert into Dish values ('D0006', 'Lamb curry' , 'no', '8.50'); Insert into Drink values ('DR0001', 'Water', 'soft', '1.0'); Insert into Drink values ('DR0002', 'Coffee', 'hot', '1.70'); Insert into Drink values ('DR0003', 'Wine' , 'alcoholic', '3.00'); Insert into Drink values ('DR0004', 'Beer' , 'alcoholic', '2.30'); Insert into Drink values ('DR0005', 'Tea' , 'hot' , '1.50'); Insert into food_order values ('F000001', '000001', 'D0003', '6'); Insert into food_order values ('F000002', '000001', 'D0001', '4'); Insert into food_order values ('F000003', '000001', 'D0004', '3'); Insert into food_order values ('F000004', '000002', 'D0001', '10'); Insert into food_order values ('F000005', '000002', 'D0002', '10'); Insert into food_order values ('F000006', '000003', 'D0002', '35'); Insert into food_order values ('F000007', '000004', 'D0002', '23'); Insert into drink_order values ('D000001', '000001', 'DR0001', '13'); Insert into drink_order values ('D000002', '000001', 'DR0002', '13'); Insert into drink_order values ('D000003', '000001', 'DR0004', '13'); Insert into drink_order values ('D000004', '000002', 'DROOO1', '20'); Insert into drink_order values ('D000005', '000002', 'DR0003', '20'); Insert into drink_order values ('D000006', '000002', 'DR0004', '15'); Insert into drink_order values ('D000007', '000003', 'DR0002', '35'); Insert into drink_order values ('D000008', '000004', 'DR0001', '23'); Insert into drink_order values ('D000009', '000004', 'DR0003', '15'); Insert into drink_order values ('D0000010', '000004', 'DR0004', '15');

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• Distinct rand() sequences yielding the same results in an expression

  - by suszterpatt

  Ok, this is a really weird one. I have an MPI program, where each process has to generate random numbers in a fixed range (the range is read from file). What happens is that even though I seed each process with a different value, and the numbers generated by rand() are different in each process, the expression to generate the random numbers still yields the same sequence between them. Here's all relevant code: // 'rank' will be unique for each process int rank; MPI_Comm_rank(MPI_COMM_WORLD, &rank); // seed the RNG with a different value for each process srand(time(NULL) + rank); // print some random numbers to see if we get a unique sequence in each process // 'log' is a uniquely named file, each process has its own log << rand() << " " << rand() << " " << rand() << std::endl; // do boring deterministic stuff while (true) { // waitTimeMin and waitTimeMax are integers, Max is always greater than Min waitSecs = waitTimeMin + rand() % (waitTimeMax - waitTimeMin); log << "waiting " << waitSecs << " seconds" << std::endl; sleep(waitSecs); // do more boring deterministic stuff } Here's the output of each process, with 3 processes generating numbers in the range [1,9]. process 1: 15190 28284 3149 waiting 6 seconds waiting 8 seconds waiting 9 seconds waiting 4 seconds process 2: 286 6264 3153 waiting 6 seconds waiting 8 seconds waiting 9 seconds waiting 4 seconds process 3: 18151 17013 3156 waiting 6 seconds waiting 8 seconds waiting 9 seconds waiting 4 seconds So while rand() clearly generates different numbers, the expression to calculate waitSecs still evaluates to the same sequence on all processes. What's even weirder: if I run the program with the same parameteres again, only the first 3 random numbers will change, the rest of the "random" sequence will be exactly the same in each run! Changing the range of numbers will obviously produce a different result from this one, but the same parameters always yield the same sequence, between processes and between executions: except for the first 3 numbers. Just what the hell is going on here?

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• service broker message process order

  - by Blootac

  Everywhere I read says that messages handled by the service broker are processed in the order that they arrive, and yet if you create a table, message type, contract, service etc , and on activation have a stored proc that waits for 2 seconds and inserts the msg into a table, set the max queue readers to 5 or 10, and send 20 odd messages I can see in the table that they are inserted out of order even though when I insert them into the queue and look at the contents of the queue I can see that the messages are all in the right order. Is it due to the delay waitfor waiting for the nearest second and each thread having different subsecond times and then fighting for a lock or something? The reason i've got a delay in there is to simulate delays with joins etc Thanks demo code: --create the table and service broker CREATE TABLE test ( id int identity(1,1), contents varchar(100) ) CREATE MESSAGE TYPE test CREATE CONTRACT mycontract ( test sent by initiator ) GO CREATE PROCEDURE dostuff AS BEGIN DECLARE @msg varchar(100); RECEIVE TOP (1) @msg = message_body FROM myQueue IF @msg IS NOT NULL BEGIN WAITFOR DELAY '00:00:02' INSERT INTO test(contents)values(@msg) END END GO ALTER QUEUE myQueue WITH STATUS = ON, ACTIVATION ( STATUS = ON, PROCEDURE_NAME = dostuff, MAX_QUEUE_READERS = 10, EXECUTE AS SELF ) create service senderService on queue myQueue ( mycontract ) create service receiverService on queue myQueue ( mycontract ) GO --********************************************************** --now insert lots of messages to the queue DECLARE @dialog_handle uniqueidentifier BEGIN DIALOG @dialog_handle FROM SERVICE senderService TO SERVICE 'receiverService' ON CONTRACT mycontract; SEND ON CONVERSATION @dialog_handle MESSAGE TYPE test ('<test>1</test>'); BEGIN DIALOG @dialog_handle FROM SERVICE senderService TO SERVICE 'receiverService' ON CONTRACT mycontract; SEND ON CONVERSATION @dialog_handle MESSAGE TYPE test ('<test>2</test>') BEGIN DIALOG @dialog_handle FROM SERVICE senderService TO SERVICE 'receiverService' ON CONTRACT mycontract; SEND ON CONVERSATION @dialog_handle MESSAGE TYPE test ('<test>3</test>') BEGIN DIALOG @dialog_handle FROM SERVICE senderService TO SERVICE 'receiverService' ON CONTRACT mycontract; SEND ON CONVERSATION @dialog_handle MESSAGE TYPE test ('<test>4</test>') BEGIN DIALOG @dialog_handle FROM SERVICE senderService TO SERVICE 'receiverService' ON CONTRACT mycontract; SEND ON CONVERSATION @dialog_handle MESSAGE TYPE test ('<test>5</test>') BEGIN DIALOG @dialog_handle FROM SERVICE senderService TO SERVICE 'receiverService' ON CONTRACT mycontract; SEND ON CONVERSATION @dialog_handle MESSAGE TYPE test ('<test>6</test>') BEGIN DIALOG @dialog_handle FROM SERVICE senderService TO SERVICE 'receiverService' ON CONTRACT mycontract; SEND ON CONVERSATION @dialog_handle MESSAGE TYPE test ('<test>7</test>')

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• Spring transaction management breaks hibernate cascade

  - by TimmyJ

  I'm having a problem where the addition of spring's transaction management to an application causes Hibernate to throw the following error: org.hibernate.HibernateException: A collection with cascade="all-delete-orphan" was no longer referenced by the owning entity instance: org.fstrf.masterpk.domain.ReportCriteriaBean.treatmentArms org.hibernate.engine.Collections.processDereferencedCollection(Collections.java:96) org.hibernate.engine.Collections.processUnreachableCollection(Collections.java:39) org.hibernate.event.def.AbstractFlushingEventListener.flushCollections(AbstractFlushingEventListener.java:218) org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:77) org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26) org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000) org.springframework.orm.hibernate3.SpringSessionSynchronization.beforeCommit(SpringSessionSynchronization.java:135) org.springframework.transaction.support.TransactionSynchronizationUtils.triggerBeforeCommit(TransactionSynchronizationUtils.java:72) org.springframework.transaction.support.AbstractPlatformTransactionManager.triggerBeforeCommit(AbstractPlatformTransactionManager.java:905) org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:715) org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:701) org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:321) org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:116) org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204) $Proxy92.saveNewReportCriteria(Unknown Source) org.fstrf.masterpk.domain.logic.MasterPkFacade.saveNewReportCriteria(MasterPkFacade.java:134) org.fstrf.masterpk.controllers.ReportCriteriaController.setupReportType(ReportCriteriaController.java:302) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:585) org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:413) org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:134) org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:310) org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:297) org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875) org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:809) org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571) org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:511) javax.servlet.http.HttpServlet.service(HttpServlet.java:710) javax.servlet.http.HttpServlet.service(HttpServlet.java:803) org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) I'm using Spring 2.5 and annotations to implement this management. Here is the class containing the saveNewReportCriteria method (which, as can be seen by the stack trace, is causing the error) @Transactional( propagation = Propagation.REQUIRED, isolation = Isolation.DEFAULT, readOnly = false) public class HibernateReportCriteriaDao implements ReportCriteriaDao{ private HibernateTemplate hibernateTemplate; public Integer saveNewReportCriteria(ReportCriteriaBean reportCriteria) { hibernateTemplate.save(reportCriteria); List<Integer> maxIdList = hibernateTemplate.find("SELECT max(id) from ReportCriteriaBean"); logger.info("ID of newly saved list is: " + maxIdList.get(0)); return maxIdList.get(0); } public void setHibernateTemplate(HibernateTemplate hibernateTemplate) { this.hibernateTemplate = hibernateTemplate; } } Then I added the following sections to my configuration files to tell spring that I am using annotation driven transaction management: <bean id="actgDataSource" class="org.springframework.jndi.JndiObjectFactoryBean"> <property name="jndiName" value="jdbc/actg" /> <property name="resourceRef" value="true" /> </bean> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="actgDataSource" /> </bean> <tx:annotation-driven/> I'm pretty sure that the de-referencing error is being caused due to the proxy class that Spring AOP creates and uses in order to handle transaction management, but I have no idea how I'd go about fixing it.

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• How to get compatibility between C# and SQL2k8 AES Encryption?

  - by Victor Rodrigues

  I have an AES encryption being made on two columns: one of these columns is stored at a SQL Server 2000 database; the other is stored at a SQL Server 2008 database. As the first column's database (2000) doesn't have native functionality for encryption / decryption, we've decided to do the cryptography logic at application level, with .NET classes, for both. But as the second column's database (2008) allow this kind of functionality, we'd like to make the data migration using the database functions to be faster, since the data migration in SQL 2k is much smaller than this second and it will last more than 50 hours because of being made at application level. My problem started at this point: using the same key, I didn't achieve the same result when encrypting a value, neither the same result size. Below we have the full logic in both sides.. Of course I'm not showing the key, but everything else is the same: private byte[] RijndaelEncrypt(byte[] clearData, byte[] Key) { var memoryStream = new MemoryStream(); Rijndael algorithm = Rijndael.Create(); algorithm.Key = Key; algorithm.IV = InitializationVector; var criptoStream = new CryptoStream(memoryStream, algorithm.CreateEncryptor(), CryptoStreamMode.Write); criptoStream.Write(clearData, 0, clearData.Length); criptoStream.Close(); byte[] encryptedData = memoryStream.ToArray(); return encryptedData; } private byte[] RijndaelDecrypt(byte[] cipherData, byte[] Key) { var memoryStream = new MemoryStream(); Rijndael algorithm = Rijndael.Create(); algorithm.Key = Key; algorithm.IV = InitializationVector; var criptoStream = new CryptoStream(memoryStream, algorithm.CreateDecryptor(), CryptoStreamMode.Write); criptoStream.Write(cipherData, 0, cipherData.Length); criptoStream.Close(); byte[] decryptedData = memoryStream.ToArray(); return decryptedData; } This is the SQL Code sample: open symmetric key columnKey decryption by password = N'{pwd!!i_ll_not_show_it_here}' declare @enc varchar(max) set @enc = dbo.VarBinarytoBase64(EncryptByKey(Key_GUID('columnKey'), 'blablabla')) select LEN(@enc), @enc This varbinaryToBase64 is a tested sql function we use to convert varbinary to the same format we use to store strings in the .net application. The result in C# is: eg0wgTeR3noWYgvdmpzTKijkdtTsdvnvKzh+uhyN3Lo= The same result in SQL2k8 is: AI0zI7D77EmqgTQrdgMBHAEAAACyACXb+P3HvctA0yBduAuwPS4Ah3AB4Dbdj2KBGC1Dk4b8GEbtXs5fINzvusp8FRBknF15Br2xI1CqP0Qb/M4w I just didn't get yet what I'm doing wrong. Do you have any ideas? EDIT: One point I think is crucial: I have one Initialization Vector at my C# code, 16 bytes. This IV is not set at SQL symmetric key, could I do this? But even not filling the IV in C#, I get very different results, both in content and length.

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• Can't find mistake -- 'segmentation fault' - in C

  - by Mosh

  Hello all! I wrote this function but can't get on the problem that gives me 'segmentation fault' msg. Thank you for any help guys !! /*This function extract all header files in a *.c1 file*/ void includes_extractor(FILE *c1_fp, char *c1_file_name ,int c1_file_str_len ) { int i=0; FILE *c2_fp , *header_fp; char ch, *c2_file_name,header_name[80]; /* we can assume line length 80 chars MAX*/ char inc_name[]="include"; char inc_chk[INCLUDE_LEN+1]; /*INCLUDE_LEN is defined | +1 for null*/ /* making the c2 file name */ c2_file_name=(char *) malloc ((c1_file_str_len)*sizeof(char)); if (c2_file_name == NULL) { printf("Out of memory !\n"); exit(0); } strcpy(c2_file_name , c1_file_name); c2_file_name[c1_file_str_len-1] = '\0'; c2_file_name[c1_file_str_len-2] = '2'; /*Open source & destination files + ERR check */ if( !(c1_fp = fopen (c1_file_name,"r") ) ) { fprintf(stderr,"\ncannot open *.c1 file !\n"); exit(0); } if( !(c2_fp = fopen (c2_file_name,"w+") ) ) { fprintf(stderr,"\ncannot open *.c2 file !\n"); exit(0); } /*next code lines are copy char by char from c1 to c2, but if meet header file, copy its content */ ch=fgetc(c1_fp); while (!feof(c1_fp)) { i=0; /*zero i */ if (ch == '#') /*potential #include case*/ { fgets(inc_chk, INCLUDE_LEN+1, c1_fp); /*8 places for "include" + null*/ if(strcmp(inc_chk,inc_name)==0) /*case #include*/ { ch=fgetc(c1_fp); while(ch==' ') /* stop when head with a '<' or '"' */ { ch=fgetc(c1_fp); } /*while(2)*/ ch=fgetc(c1_fp); /*start read header file name*/ while((ch!='"') || (ch!='>')) /*until we get the end of header name*/ { header_name[i] = ch; i++; ch=fgetc(c1_fp); }/*while(3)*/ header_name[i]='\0'; /*close the header_name array*/ if( !(header_fp = fopen (header_name,"r") ) ) /*open *.h for read + ERR chk*/ { fprintf(stderr,"cannot open header file !\n"); exit(0); } while (!feof(header_fp)) /*copy header file content to *.c2 file*/ { ch=fgetc(header_fp); fputc(ch,c2_fp); }/*while(4)*/ fclose(header_fp); } }/*frst if*/ else { fputc(ch,c2_fp); } ch=fgetc(c1_fp); }/*while(1)*/ fclose(c1_fp); fclose(c2_fp); free (c2_file_name); }

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• Setting custom UITableViewCells height

  - by Vijayeta

  I am using a custum UITableViewCell , which has some labels , buttons imageviews to be displayed.There is one label in the cell whose text is a NSString object and the length of string could be variable , due to this i cannot set a constant height to the cell in UITableViews : heightForCellAtIndex method.The ceels height depends on the labels height , whcich can be determined using the NSStrings sizeWithFont method . i tried using it , but looks like i m going wrong somewhere . Can anyone help me out in this , adding the code used in iniatilizing the cell if (self = [super initWithFrame:frame reuseIdentifier:reuseIdentifier]) { self.selectionStyle = UITableViewCellSelectionStyleNone; UIImage *image = [UIImage imageNamed:@"dot.png"]; imageView = [[UIImageView alloc] initWithImage:image]; imageView.frame = CGRectMake(45.0,10.0,10,10); headingTxt = [[UILabel alloc] initWithFrame: CGRectMake(60.0,0.0,150.0,post_hdg_ht)]; [headingTxt setContentMode: UIViewContentModeCenter]; headingTxt.text = postData.user_f_name; headingTxt.font = [UIFont boldSystemFontOfSize:13]; headingTxt.textAlignment = UITextAlignmentLeft; headingTxt.textColor = [UIColor blackColor]; dateTxt = [[UILabel alloc] initWithFrame:CGRectMake(55.0,23.0,150.0,post_date_ht)]; dateTxt.text = postData.created_dtm; dateTxt.font = [UIFont italicSystemFontOfSize:11]; dateTxt.textAlignment = UITextAlignmentLeft; dateTxt.textColor = [UIColor grayColor]; NSString * text1 = postData.post_body; NSLog(@"text length = %d",[text1 length]); CGRect bounds = [UIScreen mainScreen].bounds; CGFloat tableViewWidth; CGFloat width = 0; tableViewWidth = bounds.size.width/2; width = tableViewWidth - 40; //fudge factor //CGSize textSize = {width, 20000.0f}; //width and height of text area CGSize textSize = {245.0, 20000.0f}; //width and height of text area CGSize size1 = [text1 sizeWithFont:[UIFont systemFontOfSize:11.0f] constrainedToSize:textSize lineBreakMode:UILineBreakModeWordWrap]; CGFloat ht = MAX(size1.height, 28); textView = [[UILabel alloc] initWithFrame:CGRectMake(55.0,42.0,245.0,ht)]; textView.text = postData.post_body; textView.font = [UIFont systemFontOfSize:11]; textView.textAlignment = UITextAlignmentLeft; textView.textColor = [UIColor blackColor]; textView.lineBreakMode = UILineBreakModeWordWrap; textView.numberOfLines = 3; textView.autoresizesSubviews = YES; [self.contentView addSubview:imageView]; [self.contentView addSubview:textView]; [self.contentView addSubview:webView]; [self.contentView addSubview:dateTxt]; [self.contentView addSubview:headingTxt]; [self.contentView sizeToFit]; [imageView release]; [textView release]; [webView release]; [dateTxt release]; [headingTxt release]; } textView = [[UILabel alloc] initWithFrame:CGRectMake(55.0,42.0,245.0,ht)]; this is the label whose height and widh are going wrong

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• How to fine tune FluentNHibernate's auto mapper?

  - by Venemo

  Okay, so yesterday I managed to get the latest trunk builds of NHibernate and FluentNHibernate to work with my latest little project. (I'm working on a bug tracking application.) I created a nice data access layer using the Repository pattern. I decided that my entities are nothing special, and also that with the current maturity of ORMs, I don't want to hand-craft the database. So, I chose to use FluentNHibernate's auto mapping feature with NHibernate's "hbm2ddl.auto" property set to "create". It really works like a charm. I put the NHibernate configuration in my app domain's config file, set it up, and started playing with it. (For the time being, I created some unit tests only.) It created all tables in the database, and everything I need for it. It even mapped my many-to-many relationships correctly. However, there are a few small glitches: All of the columns created in the DB allow null. I understand that it can't predict which properties should allow null and which shouldn't, but at least I'd like to tell it that it should allow null only for those types for which null makes sense in .NET (eg. non-nullable value types shouldn't allow null). All of the nvarchar and varbinary columns it created, have a default length of 255. I would prefer to have them on max instead of that. Is there a way to tell the auto mapper about the two simple rules above? If the answer is no, will it work correctly if I modify the tables it created? (So, if I set some columns not to allow null, and change the allowed length for some other, will it correctly work with them?) EDIT: I managed to achieve the above by using Fluent NHibernate's convention API. Thanks to everyone who helped! However, there is one more thing: after checking out the convention API, I really would like my IDs to be calld "ID", not "Id", but it seems to me that the PrimaryKey.Name.Is(x => "ID") is not working at all. If I add it to the conventions collection and rewrite my entities' properties to "ID" instead of "Id", it throws an exception that there is no primary key mapped. Any thoughts on this?

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• how to create a system-wide independent universal counter object primarily for Database keys?

  - by andora

  I would like to create/use a system-wide independent universal 'counter object' that can be called via COM in a thread-safe manner. The counter object will be passed an ID to identify which counter to return, handle the counting, 'persist' the count (occasionally), have reasonable performance (as fast as possible) perhaps capable of 1000 counts per second or better (1mS) and be accessible cross-process/out-of-process. The current count status must be persisted between object restarts/shutdowns. The counter object is liklely to be a 'singleton' type object implemented in some form of free-threaded dictionary, containing maybe 10 counters (perhaps 50 max). The count needs to be monotonic and consistent, (ie: guaranteed unique sequential values). Each counter should have a few methods, like reset, inc, dec, set, clear, remove. As a luxury, I would like to have a variable-increment (ie: 'step by' value). To support thread-safefty, perhaps some sorm of critical-section or mutex call. It just needs to return a long/4byte signed integer. I really want something that can be called from anywhere, including VBScript, so I figure COM is my preferred solution. The primary use of this is for database keys. I am unable to use autoinc or guid type keys and have ruled out database-generated counting systems at this point. I've spent days researching this and I have really struggled to find a solution. The best I can find is a free-threaded dictionary object that can be instantiated using COM+ from Motobit - it seems to offer all the 'basics' and I guess I could create some form of wrapper for this. So, here are my questions: Does such a 'general purpose counter-object already exist? Can you direct me to it? (MS did do an IIS/ASP object called 'MSWC.Counter' but this isn't 'cross-process'/ out-of-process component and isn't thread-safe. (but if it was, it would do!) What is the best way of creating such a Component? (I'd prefer VB6 right-now, [don't ask!] but can do in VB.NET2005 if I had to). I don't have the skills/knowledge/tools to use anything else. I am desparate for a workable solution. I need specific guidance! If anybody can code something up for me I am prepared to pay for it.

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