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  • UNIQUE Constraints in SQL (MS-SQL)

    - by rockbala
    Why are UNIQUE Constraints needed in database ? Can you provide any examples ? Primary Key is UNIQUE by default... Understandable as they are referred in other tables as Foreign keys... relation is needed to connect them for rdbms platform... but why would one refer to other columns as UNIQUE, what is benefit of doing so ?)

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  • Python: how to inherite and override

    - by Guy
    Consider this situation: I get an object of type A which has the function f. I.e: class A: def f(): print 'in f' def h(): print 'in h' and I get an instance of this class but I want to override the f function but save the rest of the functionality of A. So what I was thinking was something of the sort: class B(A): .... def f(): print 'in B->f' and the usage would be: def main(a): b = B(a) b.f() #prints "in B->f" b.h() #print "in h" How do you do such a thing?

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  • " addressof " VB6 to VB.NET

    - by johan
    Hello, I´m having some problem to convert my VB6 project to VB.NET I dont understan how this "addressof" function should be in VB.NET My VB6 code: Declare Function MP4_ClientStart Lib "hikclient.dll" (pClientinfo As CLIENT_VIDEOINFO, ByVal abab As Long) As Long Public Sub ReadDataCallBack(ByVal nPort As Long, pPacketBuffer As Byte, ByVal nPacketSize As Long) If Not bSaved_DVS Then bSaved_DVS = True HW_OpenStream hChannelHandle, pPacketBuffer, nPacketSize End If HW_InputData hChannelHandle, pPacketBuffer, nPacketSize End Sub nn1 = MP4_ClientStart(clientinfo, AddressOf ReadDataCallBack)

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  • Background-image won't change using jquery in IE6

    - by slav
    There is a panel on my page with no default background-image css. On load it is set with jquery to an initial image, waits for 10 seconds then loads a random image out of some predetermined images. There are previous and next buttons which allow you to cycle through the images. In ie6 the initial image loads and then a random image also loads after 10 seconds, however pressing prev/next causes the background to become white and the images aren't loaded. With alerts I was able to find that it's still keeping track of the position and url of the image it's supposed to load, but just won't load it. Here is the code below. <script type="text/javascript"> var facts = new Array(); var position; $(document).ready(function() { <xsl:for-each select="$currentPage/ancestor-or-self::node[@level=1]/../node[@nodeName='Fun Fact Folder']/node"> facts[<xsl:value-of select="position()" />] = '<xsl:value-of select="." />'; </xsl:for-each> if(window.location.pathname == "/homepage.aspx" || window.location.pathname == "/") { $(".fun_facts_bg").css("background-image", "url(images/fun_fact_homepage.JPG)"); setTimeout("randomFact()",10000); } else { randomFact(); } }); function randomFact() { $("a.previous_button").css("display", "block"); $("a.next_button").css("display", "block"); position = Math.ceil(Math.random() * (facts.length - 1)); changeFact(0); } function changeFact(increment) { position = checkPosition(position, increment); $(".fun_facts_bg").css("background-image", "url(" + facts[position] + ")"); } <xsl:text disable-output-escaping="yes">&lt;!--//--&gt;&lt;![CDATA[//&gt;&lt;!-- function checkPosition(currentPos, increment) { currentPos = currentPos + increment; if (currentPos &gt; facts.length - 1) { currentPos = 1; } else if (currentPos &lt; 1) { currentPos = facts.length - 1; } return currentPos; } //--&gt;&lt;!]]&gt;</xsl:text> </script> <a class="previous_button" href="javascript:void(0);" onclick="changeFact(-1);"> <a class="next_button" href="javascript:void(0);" onclick="changeFact(1);">

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  • PHP Include Not Working on One Page

    - by Tara
    So, I finally got the PHP include function to work by tweaking the .htaccess file yesterday. The index shows up perfectly. But get this, I duplicate the index.html file, rename it and upload it as another page (as a template to work from) and now the PHP include function is not working on that page, even though it's exactly the same code hosted on the same server with the same .htaccess file. Any idea what's going on? Thank you, Tara

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  • display one-to-many relationship for a model in Django admin (list mode)

    - by theactiveactor
    In Django admin site, when listing all the objects for a given model, I know we can customize which columns get displayed for a ModelA via list_display Say that ModelA has a one-to-many relationship with ModelB. I would like to add another column on the listing page for ModelA, where each entry is a URL pointing to all objects of ModelB having a foreign key relationship on corresponding instance of Model A in that row. How can I achieve this customization with the admin app?

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  • jquery delegate table rows selector

    - by Jackob
    I have a table which may contains other inner tables (it's not possible to edit generated markup). I want to create a delegate function for row mouseenter and mouseleave which only triggers for the associated main table rows (and not inner tables rows), as following: $("#tableid").delegate("tr", "mouseenter mouseleave", function(e) { //do stuff here }); But with this selector it selects also the inner table rows, so how can I modify the selector to avoid selecting inner table rows?

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  • Jquery toggle functions

    - by ozsenegal
    I've a code to sort table using Jquery.I use toggle function to alternate clicks,and toggle beetween 'ascend' and 'descend' sort.Once you click header's table it should sort it contents. However,there's a bug: I click once,it sorts,then when i click again,nothing happens.I need to click again (second time) to execute the second function,and sort again. Toggle should switch functions with single clicks,not double,am i right? Here is the code: firstRow.toggle(function() { $(this).find("th:first").removeClass("ascendFirst").addClass("descendFirst"); $(this).find("th:not(first)").removeClass("ascend").addClass("descend"); sorted = $.makeArray($("td:eq(0)", "tr")).sort().reverse(); sorted2 = $.makeArray($("td:eq(1)", "tr")).sort().reverse(); sorted3 = $.makeArray($("td:eq(2)", "tr")).sort().reverse(); for (var i = 0; i < sorted.length; i++) { $("td", "tr:eq(" + (i + 1) + ")").remove(); $("tr:eq(" + (i + 1) + ")").append($("<td></td>").text($(sorted[i]).text())); $("tr:eq(" + (i + 1) + ")").append($("<td></td>").text($(sorted2[i]).text())); $("tr:eq(" + (i + 1) + ")").append($("<td></td>").text($(sorted3[i]).text())); } }, function() { $(this).find("th:first").removeClass("descendFirst").addClass("ascendFirst"); $(this).find("th:not(first)").removeClass("descend").addClass("ascend"); sorted = $.makeArray($("td:eq(0)", "tr")).sort(); sorted2 = $.makeArray($("td:eq(1)", "tr")).sort(); sorted3 = $.makeArray($("td:eq(2)", "tr")).sort(); for (var i = 0; i < sorted.length; i++) { $("td", "tr:eq(" + (i + 1) + ")").remove(); $("tr:eq(" + (i + 1) + ")").append($("<td></td>").text($(sorted[i]).text())); $("tr:eq(" + (i + 1) + ")").append($("<td></td>").text($(sorted2[i]).text())); $("tr:eq(" + (i + 1) + ")").append($("<td></td>").text($(sorted3[i]).text())); } });

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  • javascript and jsp

    - by akellakarthik1254
    i am new bee to java. i have a html which has a show users button, on clicking this button i should redirect the user to a users.jsp page. How do i achieve that. will a function like this will help function msg() { alert("List of Users");<br/> jsp:forward page="Users.jsp"<br/> }

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  • Should I use fork or threads?

    - by shadyabhi
    In my script, I have a function foo which basically uses pynotify to notify user about something repeatedly after a time interval say 15 minutes. def foo: while True: """Does something""" time.sleep(900) My main script has to interact with user & does all other things so I just cant call the foo() function. directly. Whats the better way of doing it and why? Using fork or threads?

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  • How to extend models of other applications in Django?

    - by culebrón
    I have a small app with Category model and want to make a required foreign key referencing it from Photologue Gallery model. What's the right approach? I can make many-to-many field in Category, but this way it will not be required in Gallery. Use "register" and modify the Gallery model? Inherit it in my app?

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  • How do I pass a bool into locationManager on iphone with stopUpdatingLocation?

    - by user295944
    I want to pass a flag into my location manager function - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation so it will look like - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation andTweet:(Bool *)tweet but it started with the command [locmanager stopUpdatingLocation]; So how can I pass the bool into the function?

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  • wcf - jquery - gridview (webform) binding

    - by Abu Hamzah
    i am using WCF to return my data and not sure how sure how i will bind the gridview once i get the data on the clientside? any help? ContactServiceProxy.invoke({ serviceMethod: "Holidays", callback: function(response) { //how to bind gridview here? }, error: function(xhr, errorMsg, thrown) { postErrorAndUnBlockUI(xhr, errorMsg, thrown); } });

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  • Python: import the containing package

    - by guy
    In a module residing inside a package, i have the need to use a function defined within the __init__.py of that package. how can i import the package within the module that resides within the package, so i can use that function? Importing __init__ inside the module will not import the package, but instead a module named __init__, leading to two copies of things with different names... Is there a pythonic way to do this?

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  • global static boolean pointer causes segmentation fault using pthread

    - by asksw0rder
    New to pthread programming, and stuck on this error when working on a C++&C mixed code. What I have done is to call the c code in the thread created by the c++ code. There is a static boolean pointer used in the thread and should got free when the thread finishes. However I noticed that every time when the program processed into the c function, the value of the boolean pointer would be changed and the segmentation fault then happened due to the free(). Detail code is as follows: static bool *is_center; // omit other codes in between ... void streamCluster( PStream* stream) { // some code here ... while(1){ // some code here ... is_center = (bool*)calloc(points.num,sizeof(bool)); // start the parallel thread here. // the c code is invoked in this function. localSearch(&points,kmin, kmax,&kfinal); // parallel free(is_center); } And the function using parallel is as follows (my c code is invoked in each thread): void localSearch( Points* points, long kmin, long kmax, long* kfinal ) { pthread_barrier_t barrier; pthread_t* threads = new pthread_t[nproc]; pkmedian_arg_t* arg = new pkmedian_arg_t[nproc]; pthread_barrier_init(&barrier,NULL,nproc); for( int i = 0; i < nproc; i++ ) { arg[i].points = points; arg[i].kmin = kmin; arg[i].kmax = kmax; arg[i].pid = i; arg[i].kfinal = kfinal; arg[i].barrier = &barrier; pthread_create(threads+i,NULL,localSearchSub,(void*)&arg[i]); } for ( int i = 0; i < nproc; i++) { pthread_join(threads[i],NULL); } delete[] threads; delete[] arg; pthread_barrier_destroy(&barrier); } Finally the function calling my c code: void* localSearchSub(void* arg_) { // omit some initialize code... // my code begin_papi_thread(&eventSet); // Processing k-means, omit codes. // is_center value will be updated correctly // my code end_papi_thread(&eventSet); // when jumping into this, error happens return NULL; } And from gdb, what I have got for the is_center is: Breakpoint 2, localSearchSub (arg_=0x600000000000bc40) at streamcluster.cpp:1711 1711 end_papi_thread(&eventSet); (gdb) s Hardware watchpoint 1: is_center Old value = (bool *) 0x600000000000bba0 New value = (bool *) 0xa93f3 0x400000000000d8d1 in localSearchSub (arg_=0x600000000000bc40) at streamcluster.cpp:1711 1711 end_papi_thread(&eventSet); Any suggestions? Thanks in advance!

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  • JNI on Android, how to pass int from c to java

    - by Joaquin
    I have a C function, I simply returns an integer, as follows: JNIEXPORT jint JNICALL Java_org_project_ScreenPosition(JNIEnv* env, jobject thiz){ int i=1; return i; } I call this function in the way of an Activity onCreateContextMenu Android, as follows: public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo){ menu.setHeaderTitle("TryMenu"); int a=ScreenPosition(); return; } But all crash

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  • warning: returning reference to temporary

    - by Jack
    I have a function like this const string &SomeClass::Foo(int Value) { if (Value < 0 or Value > 10) return ""; else return SomeClass::StaticMember[i]; } I get warning: returning reference to temporary. Why is that? I thought the both values the function returns (reference to const char* "" and reference to a static member) cannot be temporary.

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  • dijit/form/Select broken in Internet Explorer using Esri Javascript 3.7

    - by disuse
    After developing a web map app in Firefox, I tested my code in Internet Explorer (company standard) to discover that the dijit/form/Select is misbehaving using the latest Esri JavaScript v3.7. The issue I am seeing is that the Select will not update/change from the first option in the list when using v3.7. If I bump the version down to 3.6, it works as expected. I've tried IE browser modes from 7 to 10 and am experiencing the same behavior between all of them. Can someone confirm they are experiencing the same thing? Example in 3.7 - http://jsbin.com/aVIsApO/1/edit Example in 3.6 - http://jsbin.com/odIxETu/7/edit Codeblock var url = "http://services.arcgis.com/V6ZHFr6zdgNZuVG0/ArcGIS/rest/services/Street_Trees/FeatureServer/0"; var frmTrees; require([ "esri/tasks/query", "esri/tasks/QueryTask", "dojo/dom-construct", "dijit/form/Select", "dojo/parser", "dijit/registry", "dojo/on", "dojo/ready", "dojo/_base/connect", "dojo/domReady!" ], function( Query, QueryTask, domConstruct, Select, parser, registry, on, ready, connect ) { ready(function() { frmTrees = registry.byId("trees"); var qt = new QueryTask(url); var query = new Query(); query.where = "FID < 25"; query.orderByFields = ["qSpecies"]; query.returnGeometry = false; query.outFields = ["qSpecies", "TreeID"]; query.groupByFieldsForStatistics = ["qSpecies"]; //query.returnDistinctValues = true; qt.execute(query, function(results) { //var frm_domain_area = dom.byId("domain_area"); var testVals = {}; for (var i = 0; i < results.features.length; i++) { var id = results.features[i].attributes.TreeID; var desc = results.features[i].attributes.qSpecies; if (!testVals[id]) { testVals[id] = true; var selectElem = domConstruct.create("option",{ label: desc + " (" + id + ")", value: id }); frmTrees.addOption(selectElem); } } }); frmTrees.on("change", function() { console.debug(frmTrees.get("value")); }); }); });

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  • Simulating "focus" and "blur" in jQuery .live() method...

    - by Jonathan Sampson
    Update: As of jQuery 1.4, $.live() now supports focusin and focusout events. jQuery currently1 doesn't support "blur" or "focus" as arguments for the $.live() method. What type of work-around could I implement to achieve the following: $("textarea") .live("focus", function() { foo = "bar"; }) .live("blur", function() { foo = "fizz"; }); 1. 07/29/2009, version 1.3.2

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