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  • Help regarding no sql databases like hadoop, hbase etc

    - by user560370
    I am new to the distributed NoSQL databases like Hadoop, Cassandra, etc. I have few questions for which I seek an expert advice: Can you list problems/challenges one will generally face when making a shift from the present conventional database like MySQL to these large cluster-based databases? What are the difficulties, if any, when one needs to adapt to a newer version of these open source projects? Can you list out the things which are generally stored/kept in memcached for fast rendering of the page? How can I understand the source code of open-source projects so that I can build on it and maybe give back to the community? Above questions may sound to be idiotic and basic but please it's a request for the experts to answer the above questions in detailed and to best of their abilities.

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  • interface as a method parameter in Java

    - by PeterYu
    Hi all, I had an interview days ago and was thrown a question like this. Q: Reverse a linked list. Following code is given: public class ReverseList { interface NodeList { int getItem(); NodeList nextNode(); } void reverse(NodeList node) { } public static void main(String[] args) { } } I was confused because I did not know an interface object could be used as a method parameter. The interviewer explained a little bit but I am still not sure about this. Could somebody enlighten me?

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  • Casting class to interface and back

    - by Thomas
    I have the following: public interface ICartItem { string Name { get; set; } } public class CartItem : ICartItem { public string Name { get; set; } } I then create a List and cast it to an interface: IList<CartItem> items = new List<CartItem>() { new CartItem() { Name = "MyItem" } }; IList<ICartItem> cartItems = items.Cast<ICartItem>().ToList(); Is there a way to cast it back again like illustrated below? IList<CartItem> newList = cartItems as IList<CartItem>;

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  • filter lists that are split by easylistsplitter.js?

    - by Jason
    Hi Everyone, At my site - jasondaydesign.com. I'm using easylistsplitter.js. I designed it this way, because I actually wanted a masonry.js style layout but I couldn't find a way to filter divs. So I made the switch to lists, and found a plugin that allowed me to have a masonry style layout. Unfortunately, I have tried several list filters including: filterprojects.js and a netuts tutorial on a filterable portfolio. Unfortunately, both work, but only on the first column. I can't seem to figure out a way to have a filter plugin work on all list items that have been split by easylistsplitter.js Thoughts?

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  • AutoMapping Custom Collections with FluentNHibernate

    - by ScottBelchak
    I am retrofitting a very large application to use NHibernate as it's data access strategy. Everything is going well with AutoMapping. Luckily when the domain layer was built, we used a code generator. The main issue that I am running into now is that every collection is hidden behind a custom class that derives from List<. For example public class League { public OwnerList owners {get;set;} } public class OwnerList : AppList<Owner> { } public class AppList<T> : List<T> { } What kind of Convention do I have to write to get this done?

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  • InfoPath Getting SharePoint Group Information

    - by anon
    I have an InfoPath form embedded in an aspx page on a SharePoint site. How do I bind the SharePoint user groups to a drop-down list on my form? What I've tried so far is to create a data connection to a web service (method GetGroupCollectionFromWeb) to pull the data. Next, I open the list box properties, select "Look up values from an external data source", select the data source, assign the entries, and I get the following error: "You must select a repeating group or field." What I don't understand is that since the method I am calling is called GetGroupCollectionFromWeb, isn't the return value a collection? And aren't collections repeating by definition? What am I missing, and is there a workaround? Thank you.

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  • Simplest way to create a wrapper class around some strings for a WPF DataGrid?

    - by Joel
    I'm building a simple hex editor in C#, and I've decided to use each cell in a DataGrid to display a byte*. I know that DataGrid will take a list and display each object in the list as a row, and each of that object's properties as columns. I want to display rows of 16 bytes each, which will require a wrapper with 16 string properties. While doable, it's not the most elegant solution. Is there an easier way? I've already tried creating a wrapper around a public string array of size 16, but that doesn't seem to work. Thanks *The rational for this is that I can have spaces between each byte without having to strip them all out when I want to save my edited file. Also it seems like it'll be easier to label the rows and columns.

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  • Installation error: INSTALL_FAILED_OLDER_SDK in eclipse

    - by user3014909
    I have an unexpe`ted problem with my Android project. I have a real android device with ice_cream sandwich installed. My app was working fine during the development but after I added a class to the project, I got an error: Installation error: INSTALL_FAILED_OLDER_SDK The problem is that everything is good in the manifest file. The minSdkversion is 8. Here is my manifest file: <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="zabolotnii.pavel.timer" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="18 " /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="zabolotnii.pavel.timer.TimerActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest> I don't know, if there is any need to attach the new class ,but I didn't any changes to other code that should led to this error: package zabolotnii.pavel.timer; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.graphics.Paint; import android.graphics.Point; import android.graphics.Rect; import android.graphics.drawable.Drawable; import android.os.Environment; import android.util.DisplayMetrics; import android.util.TypedValue; import android.view.*; import android.widget.*; import java.io.File; import java.io.FilenameFilter; import java.util.*; public class OpenFileDialog extends AlertDialog.Builder { private String currentPath = Environment.getExternalStorageDirectory().getPath(); private List<File> files = new ArrayList<File>(); private TextView title; private ListView listView; private FilenameFilter filenameFilter; private int selectedIndex = -1; private OpenDialogListener listener; private Drawable folderIcon; private Drawable fileIcon; private String accessDeniedMessage; public interface OpenDialogListener { public void OnSelectedFile(String fileName); } private class FileAdapter extends ArrayAdapter<File> { public FileAdapter(Context context, List<File> files) { super(context, android.R.layout.simple_list_item_1, files); } @Override public View getView(int position, View convertView, ViewGroup parent) { TextView view = (TextView) super.getView(position, convertView, parent); File file = getItem(position); if (view != null) { view.setText(file.getName()); if (file.isDirectory()) { setDrawable(view, folderIcon); } else { setDrawable(view, fileIcon); if (selectedIndex == position) view.setBackgroundColor(getContext().getResources().getColor(android.R.color.holo_blue_dark)); else view.setBackgroundColor(getContext().getResources().getColor(android.R.color.transparent)); } } return view; } private void setDrawable(TextView view, Drawable drawable) { if (view != null) { if (drawable != null) { drawable.setBounds(0, 0, 60, 60); view.setCompoundDrawables(drawable, null, null, null); } else { view.setCompoundDrawables(null, null, null, null); } } } } public OpenFileDialog(Context context) { super(context); title = createTitle(context); changeTitle(); LinearLayout linearLayout = createMainLayout(context); linearLayout.addView(createBackItem(context)); listView = createListView(context); linearLayout.addView(listView); setCustomTitle(title) .setView(linearLayout) .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { if (selectedIndex > -1 && listener != null) { listener.OnSelectedFile(listView.getItemAtPosition(selectedIndex).toString()); } } }) .setNegativeButton(android.R.string.cancel, null); } @Override public AlertDialog show() { files.addAll(getFiles(currentPath)); listView.setAdapter(new FileAdapter(getContext(), files)); return super.show(); } public OpenFileDialog setFilter(final String filter) { filenameFilter = new FilenameFilter() { @Override public boolean accept(File file, String fileName) { File tempFile = new File(String.format("%s/%s", file.getPath(), fileName)); if (tempFile.isFile()) return tempFile.getName().matches(filter); return true; } }; return this; } public OpenFileDialog setOpenDialogListener(OpenDialogListener listener) { this.listener = listener; return this; } public OpenFileDialog setFolderIcon(Drawable drawable) { this.folderIcon = drawable; return this; } public OpenFileDialog setFileIcon(Drawable drawable) { this.fileIcon = drawable; return this; } public OpenFileDialog setAccessDeniedMessage(String message) { this.accessDeniedMessage = message; return this; } private static Display getDefaultDisplay(Context context) { return ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay(); } private static Point getScreenSize(Context context) { Point screeSize = new Point(); getDefaultDisplay(context).getSize(screeSize); return screeSize; } private static int getLinearLayoutMinHeight(Context context) { return getScreenSize(context).y; } private LinearLayout createMainLayout(Context context) { LinearLayout linearLayout = new LinearLayout(context); linearLayout.setOrientation(LinearLayout.VERTICAL); linearLayout.setMinimumHeight(getLinearLayoutMinHeight(context)); return linearLayout; } private int getItemHeight(Context context) { TypedValue value = new TypedValue(); DisplayMetrics metrics = new DisplayMetrics(); context.getTheme().resolveAttribute(android.R.attr.listPreferredItemHeightSmall, value, true); getDefaultDisplay(context).getMetrics(metrics); return (int) TypedValue.complexToDimension(value.data, metrics); } private TextView createTextView(Context context, int style) { TextView textView = new TextView(context); textView.setTextAppearance(context, style); int itemHeight = getItemHeight(context); textView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, itemHeight)); textView.setMinHeight(itemHeight); textView.setGravity(Gravity.CENTER_VERTICAL); textView.setPadding(15, 0, 0, 0); return textView; } private TextView createTitle(Context context) { TextView textView = createTextView(context, android.R.style.TextAppearance_DeviceDefault_DialogWindowTitle); return textView; } private TextView createBackItem(Context context) { TextView textView = createTextView(context, android.R.style.TextAppearance_DeviceDefault_Small); Drawable drawable = getContext().getResources().getDrawable(android.R.drawable.ic_menu_directions); drawable.setBounds(0, 0, 60, 60); textView.setCompoundDrawables(drawable, null, null, null); textView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)); textView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { File file = new File(currentPath); File parentDirectory = file.getParentFile(); if (parentDirectory != null) { currentPath = parentDirectory.getPath(); RebuildFiles(((FileAdapter) listView.getAdapter())); } } }); return textView; } public int getTextWidth(String text, Paint paint) { Rect bounds = new Rect(); paint.getTextBounds(text, 0, text.length(), bounds); return bounds.left + bounds.width() + 80; } private void changeTitle() { String titleText = currentPath; int screenWidth = getScreenSize(getContext()).x; int maxWidth = (int) (screenWidth * 0.99); if (getTextWidth(titleText, title.getPaint()) > maxWidth) { while (getTextWidth("..." + titleText, title.getPaint()) > maxWidth) { int start = titleText.indexOf("/", 2); if (start > 0) titleText = titleText.substring(start); else titleText = titleText.substring(2); } title.setText("..." + titleText); } else { title.setText(titleText); } } private List<File> getFiles(String directoryPath) { File directory = new File(directoryPath); List<File> fileList = Arrays.asList(directory.listFiles(filenameFilter)); Collections.sort(fileList, new Comparator<File>() { @Override public int compare(File file, File file2) { if (file.isDirectory() && file2.isFile()) return -1; else if (file.isFile() && file2.isDirectory()) return 1; else return file.getPath().compareTo(file2.getPath()); } }); return fileList; } private void RebuildFiles(ArrayAdapter<File> adapter) { try { List<File> fileList = getFiles(currentPath); files.clear(); selectedIndex = -1; files.addAll(fileList); adapter.notifyDataSetChanged(); changeTitle(); } catch (NullPointerException e) { String message = getContext().getResources().getString(android.R.string.unknownName); if (!accessDeniedMessage.equals("")) message = accessDeniedMessage; Toast.makeText(getContext(), message, Toast.LENGTH_SHORT).show(); } } private ListView createListView(Context context) { ListView listView = new ListView(context); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int index, long l) { final ArrayAdapter<File> adapter = (FileAdapter) adapterView.getAdapter(); File file = adapter.getItem(index); if (file.isDirectory()) { currentPath = file.getPath(); RebuildFiles(adapter); } else { if (index != selectedIndex) selectedIndex = index; else selectedIndex = -1; adapter.notifyDataSetChanged(); } } }); return listView; } }

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  • AS3 + addChild() getting image from library to the stage

    - by Colin
    Hi, I have an .fla file with 1 image in the library and 1 .as file. I have linked the image up with the Class name of libraryImages and Base class is flash.display.BitmapData. This is my AS: package { import flash.display.Bitmap; import flash.display.BitmapData; import flash.display.MovieClip; public class Banner extends MovieClip { var defaultImage:libraryImages = new libraryImages(469, 60); var myImage:Bitmap = new Bitmap(defaultImage); addChild(myImage); } } I am getting two errors: 1180: Call to a possibly undefined method addChild. 1120: Access of undefined property myImage. Any ideas?

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  • Effective way of String splitting

    - by openidsujoy
    I have a completed string like this N:Pay in Cash++RGI:40++R:200++T:Purchase++IP:N++IS:N++PD:PC++UCP:598.80++UPP:0.00++TCP:598.80++TPP:0.00++QE:1++QS:1++CPC:USD++PPC:Points++D:Y++E:Y++IFE:Y++AD:Y++IR:++MV:++CP:~ ~N:ERedemption++RGI:42++R:200++T:Purchase++IP:N++IS:N++PD:PC++UCP:598.80++UPP:0.00++TCP:598.80++TPP:0.00++QE:1++QS:1++CPC:USD++PPC:Points++D:Y++E:Y++IFE:Y++AD:Y++IR:++MV:++CP: this string is like this It's list of PO's(Payment Options) which are separated by ~~ this list may contains one or more PO contains only Key-Value Pairs which separated by : spaces are denoted by ++ I need to extract the values for Key "RGI" and "N". I can do it via for loop , I want a efficient way to do this. any help on this.

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  • jQuery Tiny Scrollbar plugin - Fails to show all content on refresh

    - by Søren Østergaard
    Hi Guys! I've implemented Tiny Scrollbar plugin on a website, for good-looking div scrolling. But weird stuff happens when I refresh the page in Safari or Chrome. It seams to clip some of my content. What happens upon a page refresh, that could make it behave like this? Please have a look at mettestentoft.dk I've tried using the same plugin on a simple test page, where a page refresh would make the plugin add a 'scrollbar disable' class to the div, while clicking a link linking to the same page, would make i show as it should. Tiny Scrollbar plugin demopage doesn't seem to have any problems, unless I'm missing it. So my question is: Do I have to do something jQuery-wise, in order for a page to load equally to a linked page? Thank you in advance :)

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  • Sortable with scriptaculous problems

    - by user195257
    hello, Im following a few tutorials to sort a list, but i can't get the DB to update. The drag drop side of things is working, also, i javascript alert() the serialize list onUpdate and the order is printed out as follows: images_list[]=20&images_list[]=19 etc... So the sorting and dragging is working fine, i just cant get the database to update, this is my code. <script type="text/javascript"> Sortable.create("images_list", { onUpdate: function() { new Ajax.Request("processor.php", { method: "post", parameters: { data: Sortable.serialize("images_list") } }); } }); processor.php code: //Connect to DB require_once('connect.php'); parse_str($_POST['data']); for ($i = 0; $i < count($images_list); $i++) { $id = $images_list[$i]; mysql_query("UPDATE `images` SET `ranking` = '$i' WHERE `id` = '$id'"); } Any ideas would be great, thankyou!

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  • Does the "using" directive provide any benefit?

    - by Adam Drummond
    Is there a programmatic benefit to using a using statement? Notice the difference between this sample: using Application.Data; namespace Application.Web { public class SampleClass { public void SampleMethod() { List<Category> categories = CreateCategoriesData(); Category expected = categories[0]; ... ... } } } And this one: namespace Application.Web { public class SampleClass { public void SampleMethod() { List<Data.Category> categories = CreateCategoriesData(); Data.Category expected = categories[0]; ... ... } } }

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  • Highlight row of form when input is focussed

    - by Jeepstone
    I have the following piece of Mootools 1.11 code (not upgradable as this is within Joomla), which I want to highlight the form row, when an item within it is focussed. However, this doesn't work. I need to know how to access the parent div of the form item. window.addEvent('domready', function() { var list = $$('#ChronoContact_lensorder div.formrow'); list.each(function(element) { var fx = new Fx.Styles(element, {duration:200, wait:false}); element.addEvent('focus', function(){ fx.start({ 'background-color': '#e6f0f2', color: '#FFF' }); }); element.addEvent('focus', function(){ fx.start({ 'background-color': '#FFF', 'color': '#2F9AD0' }); }); }); }); HTML is: <div class="formrow"> <label for="ud">Uncut Diameter:</label> <input type="text" id="ud" name="ud" /> </div> Thanks

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  • How to get a float value the pointer points to?

    - by aleluja
    Hello, In my app, i've created the TList type list where i store the pointers to 1 string and 2 float(real) values for every 3 items. aList.Add(@sName); //string aList.Add(@x1); //float aList.Add(@x2); //float Then, i want to get the values out from the list, but i could only do that for string sStr := string(lList.items[i]); But i couldn't get the float values as a := real(lList...) will result in an invalid typecast error. So what do i do to get the float values? Of course i have a question if that string casting will actually give me the string value. I'm not good at pointer stuff so i don't know how to do it.

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  • Dismiss Menu when Focus is lost, not on mouseout. jQuery

    - by Stacey
    I have jQuery that drops a menu down when its parent is clicked on, and dismisses it when they hover away from the menu. I am wanting to change the behavior so that it only dismisses if they click somewhere else on the page, or a different menu. Is this possible? jQuery.fn.dropdown = function () { return this.each(function () { $('.ui-dropdown-list > li > a').click(function () { $(this).addClass("ui-dropdown-hover"); }); $("ul.ui-dropdown-list > li > a").click(function () { $(this).parent().find("ul").show(); $(this).parent().hover(function () { }, function () { $(this).parent().find("ul").hide(); $(this).find('> a').removeClass("ui-dropdown-hover"); }); }); }); };

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  • How do I pass struts2 <s:select multiple="true"> with a Map

    - by deepblue
    I have an bean placed on my action Event.java, the action is Called ManageEvents. I would like the user to be able to add to a struts2 multiple select form field and create a list or map of items (in this case Map where the data would be . <struts2:select name="event.dj_map" label="Add DJs To Your Event" list="event.dj_map" listsize="5" multiple="true" headerKey="headerKey" required="true" headerValue="--- Please Select ---"> So ultimately I would like to know how to pass a mult. select field (e.g. Events.dj_map) as a map of name,value pairs to an object (e.g. Event.java) set on the action (e.g. ManageEvents.java).

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  • ASP NET forms Authorization: how to reduce duration?

    - by eddo
    I've got a web page which is implementing cookie based ASPNET Forms Authentication. Once the user has logged in the page, he can edit some information using a form which is created using a partialview and returned to him as a dialog for editing. The action linked to the partial view is decorated as follows: [HttpGet] [OutputCache(Duration = 0, VaryByParam = "None")] [Authorize(Roles = "test")] public ActionResult changeTripInfo(int tripID, bool ovride=false) { ... } The problem i am experiencing is the latency between the request and the time when the dialog is shown to the user: time ranges between 800 and 1100 ms which is not justified by the complexity of the form. Investigating with Glimpse turns out that the time to process the AuthorizeAttribute (see snip) sums up to at least 650 ms which is troubling me. Looking at the Sql server log, the call which checks the user roles takes, as expected, virtually nothing (duration 0). How can I reduce this time? Am I missing some optimization?

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  • Windows Phone: Updating backend datastore (via web service) while keeping UI very responsive

    - by will
    I am developing a Windows Phone app where users can update a list. Each update, delete, add etc need to be stored in a database that sits behind a web service. As well as ensuring all the operations made on the phone end up in the cloud, I need to make sure the app is really responsive and the user doesn’t feel any lag time whatsoever. What’s the best design to use here? Each check box change, each text box edit fires a new thread to contact the web service? Locally store a list of things that need to be updated then send to the server in batch every so often (what about the back button)? Am I missing another even easier implementation? Thanks in advance,

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  • File upload control - Select file is lossed when 2nd control is initiatied

    - by Barry
    Our problem/question revolves around an upload control that loses the selected file (goes blank) when a postback control is used (in this case, the dropdown list posts). Any insight into what we are doing wrong or how we can fix this? Below is our code and a summary of the problem. Any help would be greatly appreciated. Thank you! <asp:updatepanel id="UpdatePanel1" runat="server"> <ContentTemplate> <div class="row"> <asp:DropDownList runat="server" AutoPostBack="true" ID="CategorySelection" OnSelectedIndexChanged="CategorySelection_IndexChanged" CssClass="drop-down-list" /> </div> <div id="SubCategory" class="row" runat="server" visible="false"> <asp:DropDownList runat="server" ID="SubCategorySelection" CssClass="drop-down-list" /> </div> <div class="row"> <asp:FileUpload runat="server" ID="FileUpload" CssClass="file-upload" /> </div> <div class="row"> <asp:Button ID="submit" runat="server" Text="Submit" CssClass="button" OnClick="submit_ButtonClick" /> </div> </ContentTemplate> <Triggers> <asp:PostBackTrigger ControlID="submit" /> </Triggers> </asp:updatepanel> In this form we have 2 DropDownList, 1 FileUpload and 1 submit button. Every time that the user selects one category, the subcategories are loaded (AutoPostBack=”true”). The primary user flow works fine: User selects one category, subcategory and selects a file to be uploaded (submitted). HOWEVER, if the user selects a file first, and then selects a category, the screen will do a partial refresh and the selected file will disappear (field goes blank). As a result, the user needs to select the file again. This causes an issue because the fact that the file is no longer selected can easily be overlooked. Seems straighforward --- but causing us a lot of grief. Any experts out there that can help? BIG thanks!

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  • Missing something with Entity Framework for .NET 3.5?

    - by AC
    Is it not possible to have EF create the necessary entities when I have two related tables linked with a FK in .NET3.5SP1? I see where the checkbox to support this is disabled but it is available in .NET4. I've got a DB that has only tables with relationships in it. I need to build a Silverlight app (SL4) that allows management of the data within this app. I can't use .NET4 on the server... only .NET3.5SP1 so FK relationship bit in EF4 isn't available to me. Looking to avoid building as much of the plumbing to get back to the DB from the SL4 app as possible...

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  • Testing the load factor in my lab [closed]

    - by Ami Winter
    I am a system admin in a lab, I have ~90 computers in the lab and I want to check the load factor on them.. meaning, to check how many people are working on the computers hourly.. To see if I need to buy more computers or not. I am looking for a way to build a script to check if a computer is logged on or not.. (0 for log off - 1 for log on) After I will have this data, I know how to build a script to build me the graphs. All the computers are linked via a domain and most of them have windows XP (few windows 7) I'll be happy to get some help. Amihay

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  • Help with Magento and related products

    - by Anthony
    I have a customer product page that literally lives beside the catalog/product/view.phtml page. It's basically identical to that page with a few small exceptions. It's basically a 'product of the day' type page so I can't combine it with the regular product page since I have to fetch the data from the DB and perform a load to get the product information $_product = Mage::getModel('catalog/product')->load($row['productid']); To make a long story short, everything works (including all children html blocks) with the singular exception of the related products. After the load I save the product into the registry with Mage::register('product', $_product); and then attempt to load the related products with: echo $this->getLayout()->createBlock('catalog/product_view')->setTemplate('catalog/product/list/related.phtml')->toHtml();` All of which give back the error: Fatal error: Call to a member function getSize() on a non-object in catalog/product/list/related.phtml on line 29`, and line 29 is <?php if($this->getItems()->getSize()): ?>`. Any help getting the relateds to load would be appreicated.

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