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  • null values vs "empty" singleton for optional fields

    - by Uko
    First of all I'm developing a parser for an XML-based format for 3D graphics called XGL. But this question can be applied to any situation when you have fields in your class that are optional i.e. the value of this field can be missing. As I was taking a Scala course on coursera there was an interesting pattern when you create an abstract class with all the methods you need and then create a normal fully functional subclass and an "empty" singleton subclass that always returns false for isEmpty method and throws exceptions for the other ones. So my question is: is it better to just assign null if the optional field's value is missing or make a hierarchy described above and assign it an empty singleton implementation?

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  • The actual difference between styesheet in the header and a seperate file

    - by David Knight
    Am wondering if someone can give me an opinion on this. I have always been taught to have all of the CSS in a separate file that is referenced from the head of the page. Reading this article http://www.lukew.com/ff/entry.asp?1792 the author is talking about making the Guardian website responsive. One of the things he notes they did to make the site faster and more resilient is to add the CSS inline into the header, thus reducing HTTP requests. Now this got me thinking about the right/best/fastest way of using the CSS If you have one main CSS file, its going to be called and read by the site on every page, no mater how big it is. So with that in mind, Im actually starting to think its better to just inline the whole style sheet and remove one HTTP roundtrip. I know for the purposes of neatness and being able to edit the file a seperate file is better. But which would you recommend and which do you think is faster? Thanks!

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  • REST - Tradeoffs between content negotiation via Accept header versus extensions

    - by Brandon Linton
    I'm working through designing a RESTful API. We know we want to return JSON and XML for any given resource. I had been thinking we would do something like this: GET /api/something?param1=value1 Accept: application/xml (or application/json) However, someone tossed out using extensions for this, like so: GET /api/something.xml?parm1=value1 (or /api/something.json?param1=value1) What are the tradeoffs with these approaches? Is it best to rely on the accept header when an extension isn't specified, but honor extensions when specified? Is there a drawback to that approach?

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  • can't update 12.04 getting package header error

    - by joel
    I originally posted this question, and was redirected to another thread where the question had already been asked. I then posted to that thread and had my post deleted by moderator fossfreedom, and told to post a "new" question... so wth ever.... I don't care if it's old or new I just need help here people! In a nutshell, I can't use sudo apt-get update or the GUI update tool to update my system. Anytime I try using either tool it gives me an error about packages missing headers. I can't send error reports, I have tried all the listed solutions from this post: I can't update my system properly, "no package header" error and from this post: "Problem with MergeList" error when trying to do an update and neither one work. I just want a working solution since I don't have the means of re-installing the OS entirely, and I REALLY don't want to have to go back to using Windows.

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  • How accurate is header information received?

    - by blankip
    Please see What could keep a javascript from loading properly on a page? In the header it shows that it is coming from IIS 6.0. How accurate is this information? Also this vendor (which is the worst I have worked with) made us go through a huge server switch process. Did they "upgrade" to W2003 IIS6.0? What would be the reason for a "new" server to be running this old of a version of IIS? Am I missing something?

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  • Site returning 404 header to google, not sure why

    - by Damon
    A Drupal site that works fine for regular users returns a 404 not found error when I try to use the W3C validator on it; it is also not being indexed by google at all (which is the main issue but I suspect there is a connection). It is a https:// site with .htaccess rule to redirect any http:// request to the https://. I had had it running in google webmaster tools and thought it was fine, but it turns out I had not added the https domain. After adding the https domain it's also returning the header as HTTP/1.1 404 Not Found Date: Mon, 15 Oct 2012 19:37:43 GMT Server: Apache Expires: Sun, 19 Nov 1978 05:00:00 GMT Cache-Control: no-cache, must-revalidate, post-check=0, pre-check=0 Robots.txt just has User-agent: * Crawl-delay: 10 # Files Disallow: /cron.php How can I check what the issue is here?

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  • Recognizing text fields according to their label value

    - by Pierpaolo Bagnasco
    I have an application who has text fields (not select, not checkbox or other types) where an user can enter some value, like this: ISBN and E-Mail are the label of each input. Now I have to automatically test these inputs according to their label. The question is: how to recognize that, for example, the first input requires an ISBN code? I programmed something like this: turn the label value to lowercase check if the label value contains isbn if so set the field value to a random ISBN code (i.e.: 1234567890), else set it to a random value (default) For the email field: turn the label value to lowercase check if the label value contains e-mail or email or mail if so set the field value to a random email (i.e.: [email protected]), else set it to a random value (default) And so on for each text field I encounter. Is that reliable? How can I improve the "recognizing part"? I know only the label value and the field value (what is already written in the field by default) for each text input.

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  • Wordpress homepage with latest posts and Advanced Custom fields - How?

    - by Allan Crabtree
    I'd like my homepage to display my latest posts which are portfolio projects of mine. Beneath these project thumbnails I've got my static content which I'm using the Repeater add-on from Advanced Custom Fields to grab. I cant get it all to work on the same page... either get the blog to work or the ACF stuff to work. Never both because one needs to be a designated static page and one needs to be a posts page. I don't understand how to tie it together and make it appear as one page. I've experimented with the settings in the reading panel.. I've tried using front-page.php I've read up on the WP hierarchy etc I've tried using templates... I've tried wp_reset_postdata(); which I read about elsewhere on Stack Overflow. What settings must I use in the reading panel. Do I need to use a template file? Here's the code I'm working with, I've split the code between templates and different files already, but just for ease of reading its all together here (maybe that's the right way to do it anyway, I wouldn't know..) <!-- The posts/portfolio items --> <?php get_header(); ?> <div> <?php if(have_posts()) : ?> <ul> <?php while ( have_posts() ) : the_post(); ?> <li> <!-- Permalink,title and post thumbnail here (omitted) --> </li> <?php endwhile; ?> </ul> <?php else: ?> <h2>No Posts found</h2> <?php endif; ?> </div> <!-- Now for the ACF Stuff --> <?php if(get_field('care_list')): ?> <?php while(has_sub_field('care_list')): ?> <div class="grid_2 what-i-care-about gap"> <div class="important-img-container"> <?php the_sub_field('care_list_image'); ?> </div> <h3><?php the_sub_field('care_list_title'); ?></h3> </div> <?php endwhile; ?> <?php endif; ?> <?php get_footer(); ?> Please help a frustrated learner! Thanks in advance.

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  • wpf datagrid extra column in header on left

    - by sb
    I keep getting this button in the header, I can click on the button to select all rows. This misaligns the data from the header. Any ideas? Thanks in Advance. Datagrid image via link: http://picasaweb.google.com/lh/photo/CahvlINknhL5ykIW2zCfIw?feat=directlink <dg:DataGrid.Columns> <dg:DataGridTextColumn Header="Description" Width=".5*" Binding="{Binding Description}"> </dg:DataGridTextColumn> <dg:DataGridTextColumn Header="Type" Width="100" Binding="{Binding Type}"> </dg:DataGridTextColumn> <dg:DataGridTextColumn Header="Amount $" Width="100" Binding="{Binding Amount}"> </dg:DataGridTextColumn> <dg:DataGridTextColumn Header="Effective From Date" Width="100" Binding="{Binding EffectiveFromDate}" IsReadOnly="True"> </dg:DataGridTextColumn> <dg:DataGridTextColumn Header="Effective To Date" Width="100" Binding="{Binding EffectiveToDate}" IsReadOnly="True"> </dg:DataGridTextColumn> <dg:DataGridTextColumn Header="Status" Width="100" Binding="{Binding Status}"> </dg:DataGridTextColumn> </dg:DataGrid.Columns>

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  • download file, without saving in server

    - by lolalola
    Hi, Or possible for users to download the file without saving it on the server? I am getting data from the database, and I want to save them .doc (MS Word) file. if(isset($_POST['save'])) { $file = "new_file2.doc"; $stringData = "Text text text text...."; //This data put in new Word file $fh = fopen($file, 'w'); fwrite($fh, $stringData); fclose($fh); header('Content-Description: File Transfer'); header('Content-type: application/msword'); header('Content-Disposition: attachment; filename="'.$file.'"'); header('Content-Transfer-Encoding: binary'); header('Expires: 0'); header('Cache-Control: must-revalidate, post-check=0, pre-check=0'); header('Pragma: public'); header('Content-Length: ' . filesize($file)); ob_clean(); flush(); readfile($file); unlink($file); exit; } How should the code look like without this: " $fh = fopen($file, 'w'); fwrite($fh, $stringData); fclose($fh);" and this "unlink($file);" I hope to understand what I need enter code here

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  • HAProxy: session stickiness triggered by response header possible?

    - by zoli
    I'm investigating HAProxy as a possible replacement for F5. F5 is capable of persisting a session based on a response header value: when HTTP_RESPONSE { set session [HTTP::header X-Session] if {$session ne ""} { persist add uie $session } } and then route all subsequent requests which contain the same session ID in a header, query parameter, path, etc. to the same machine, eg: when HTTP_REQUEST { set session [findstr [HTTP::path] "/session/" 9 / if {$session} { persist uie $session } } I'm wondering if this is even possible to do with HAProxy?

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  • Change the language of fields in Microsoft Word

    - by Martin Wiboe
    Hi, I am using Word 2010 and some built-in features with fields, such as bibliography. My Word installation is English and I am writing a report in US English. However, my computer has its locale set to Denmark. This affects the formatting of dates and some of the text in the auto-generated fields (e.g. in bibliography it says "citeret:" instead of "cited:"). How can I change the language of the fields to US English? Thanks, Martin

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  • How to log size of cookies in request header with apache

    - by chrisst
    We have an issue on our site with cookies growing too large. We have already expanded the acceptable header size and throttled the cookie sizes for now, but I'd like to figure out what the average client's header sizes are, specifically of the cookies. I've created an apache log that captures the cookies being set on each request: LogFormat "%{Cookie}i" cookies But this just spits out the entire contents of all cookies in the header. Is there a way to have apache just log the size (or just length of the string) per request?

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  • Repeat the csv header twice without "Append" (PowerShell 1.0)

    - by Mark
    I have prepared a PowerShell script to export a list of system users in CSV format. The script can output the users list with Export-csv with single header row (the header row at top). However my requirement is to repeat the header row twice in my file. It is easy to achieve in PowerShell 3.0 with "Append" (e.g. $header | out-file $filepath -Append) Our server envirnoment is running PowerShell 1.0. Hence I cannot do it. Is there any workaround? I cannot manually add it myself. Thank you.

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  • adding response header to Jetty config file

    - by Sam007
    I am trying to add a response header to the Jetty configuration the following command, Access-Control-Allow-Origin: * Ok so this Jetty webserver is the base on which Geoserver is running. I asked this question in the GIS forum but no one was able to answer it so I felt I might get the answer here. I wish to add this response to the header to remove the error Unable to load XMLHttpRequest I wish to know that under which tags should I wrap this response header and where in the file should I save it.

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  • swapon --all --verbose : 'read swap header failed: Invalid argument'

    - by user66088
    Recently ran through EnableHibernateWithEncryptedSwap and ran the following command: swapon --all --verbose and received: 'read swap header failed: Invalid argument' How do I fix this? Here's some more pertinent output... Output of sudo fdisk -l: Disk /dev/sda: 80.0 GB, 80026361856 bytes 255 heads, 63 sectors/track, 9729 cylinders, total 156301488 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00006d20 Device Boot Start End Blocks Id System /dev/sda1 * 2048 499711 248832 83 Linux /dev/sda2 501758 156301311 77899777 5 Extended /dev/sda5 501760 156301311 77899776 8e Linux LVM Disk /dev/mapper/ubuntu--t10194-root: 75.5 GB, 75539415040 bytes 255 heads, 63 sectors/track, 9183 cylinders, total 147537920 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/mapper/ubuntu--t10194-root doesn't contain a valid partition table Disk /dev/mapper/ubuntu--t10194-swap_1: 4227 MB, 4227858432 bytes 255 heads, 63 sectors/track, 514 cylinders, total 8257536 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x08040000 Disk /dev/mapper/ubuntu--t10194-swap_1 doesn't contain a valid partition table Disk /dev/mapper/cryptswap1: 4225 MB, 4225761280 bytes 255 heads, 63 sectors/track, 513 cylinders, total 8253440 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xd2236983 Disk /dev/mapper/cryptswap1 doesn't contain a valid partition table Thanks for any and ALL help!

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  • Adding Custom Fields to RadScheduler for WinForms Appointments

    When using RadScheduler for WinForms, it will almost always need to be customized in some way. This could come in the form of custom dialogs, context menus, or even custom appointments. In this blog entry, I am going to explain the steps required to add a custom field to RadScheduler. Click here to download the source code and follow along... Adding Custom Fields to Appointments In this example, a custom field for Email will be added to the Appointment class being used by RadScheduler. The process of accomplishing this involves five simple steps. Step 1: Add a Custom Field to the Data Source In order to display a custom field in RadScheduler, the field will first need to already exist in, or be added to the data source. In this example, the database being used is based on the structure of the SchedulerData sample database included with the installation of RadControls for WinForms. Figure 1 shows the structure of the database. Note ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • openssl/rand.h header file not found

    - by Arun Reddy Kandoor
    I have installed libssl-dev package but that did not install the include files. How do I get the openssl include files? Appreciate your help. Checking for program g++ or c++ : /usr/bin/g++ Checking for program cpp : /usr/bin/cpp Checking for program ar : /usr/bin/ar Checking for program ranlib : /usr/bin/ranlib Checking for g++ : ok Checking for node path : ok /usr/bin/node Checking for node prefix : ok /usr Checking for header openssl/rand.h : not found /home/arun/Documents/webserver/node_modules/bcrypt/wscript:30: error: the configuration failed (see '/home/arun/Documents/webserver/node_modules/bcrypt/build/config.log') npm ERR! error installing [email protected] npm ERR! [email protected] preinstall: `node-waf clean || (exit 0); node-waf configure build` npm ERR! `sh "-c" "node-waf clean || (exit 0); node-waf configure build"` failed with 1 npm ERR! npm ERR! Failed at the [email protected] preinstall script. npm ERR! This is most likely a problem with the bcrypt package, npm ERR! not with npm itself. npm ERR! Tell the author that this fails on your system: npm ERR! node-waf clean || (exit 0); node-waf configure build npm ERR! You can get their info via: npm ERR! npm owner ls bcrypt npm ERR! There is likely additional logging output above. npm ERR! npm ERR! System Linux 3.8.0-32-generic npm ERR! command "node" "/usr/bin/npm" "install" npm ERR! cwd /home/arun/Documents/webserver npm ERR! node -v v0.6.12 npm ERR! npm -v 1.1.4 npm ERR! code ELIFECYCLE npm ERR! message [email protected] preinstall: `node-waf clean || (exit 0); node-waf configure build` npm ERR! message `sh "-c" "node-waf clean || (exit 0); node-waf configure build"` failed with 1 npm ERR! errno {} npm ERR! npm ERR! Additional logging details can be found in: npm ERR! /home/arun/Documents/webserver/npm-debug.log npm not ok

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  • header and footer in Prawn PDF

    - by Nik
    Hello all, I have read through all relevant posts on Prawn but found no mentioning (even in Prawn's own documentation) of headers and footers. However, I did see a demo on Prawnto's own website about headers and footers. I copied the entire source of that demo just to see if it works but an error of undefined method "header" is complained about. Am I to understand that Prawn took out header and footer recently in the gem or is there something else I need to do first to use header and footer? The demo page: http://cracklabs.com/prawnto/code/prawn_demos/source/text/flowing_text_with_header_and_footer the part of code of concern: Prawn::Document.generate("flow_with_headers_and_footers.pdf") do header margin_box.top_left do text "Here's My Fancy Header", :size = 25, :align = :center end text "hello world!" end And by header, just in case, I mean the snippets of words that appear usually at a corner of every page of a document. Like your account number in your bills pages. thanks!

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  • what's wrong with mysql to create very long table fields?

    - by peng
    mysql> create table balance_sheet( -> Cash_and_cash_equivalents VARCHAR(20), -> Trading_financial_assets VARCHAR(20), -> Note_receivable VARCHAR(20), -> Account_receivable VARCHAR(20), -> Advance_money VARCHAR(20), -> Interest_receivable VARCHAR(20), -> Dividend_receivable VARCHAR(20), -> Other_notes_receivable VARCHAR(20), -> Due_from_related_parties VARCHAR(20), -> Inventory VARCHAR(20), -> Consumptive_biological_assets VARCHAR(20), -> Non_current_asset(expire_in_a_year) VARCHAR(20), -> Other_current_assets VARCHAR(20), -> Total_current_assets VARCHAR(20), -> Available_for_sale_financial_assets VARCHAR(20), -> Held_to_maturity_investment VARCHAR(20), -> Long_term_account_receivable VARCHAR(20), -> Long_term_equity_investment VARCHAR(20), -> Investment_real_eastate VARCHAR(20), -> Fixed_assets VARCHAR(20), -> Construction_in_progress VARCHAR(20), -> Project_material VARCHAR(20), -> Liquidation_of_fixed_assets VARCHAR(20), -> Capitalized_biological_assets VARCHAR(20), -> Oil_and_gas_assets VARCHAR(20), -> Intangible_assets VARCHAR(20), -> R&d_expense VARCHAR(20), -> Goodwill VARCHAR(20), -> Deferred_assets VARCHAR(20), -> Deferred_income_tax_assets VARCHAR(20), -> Other_non_current_assets VARCHAR(20), -> Total_non_current_assets VARCHAR(20), -> Total_assets VARCHAR(20), -> Short_term_borrowing VARCHAR(20), -> Transaction_financial_liabilities VARCHAR(20), -> Notes_payable VARCHAR(20), -> Account_payable VARCHAR(20), -> Item_received_in_advance VARCHAR(20), -> Employee_pay_payable VARCHAR(20), -> Tax_payable VARCHAR(20), -> Interest_payable VARCHAR(20), -> Dividend_payable VARCHAR(20), -> Other_account_payable VARCHAR(20), -> Due_to_related_parties VARCHAR(20), -> Non_current_liabilities_due_within_one_year VARCHAR(20), -> Other_current_liabilities VARCHAR(20), -> Total_current_liabilities VARCHAR(20), -> Long_term_loan VARCHAR(20), -> Bonds_payable VARCHAR(20), -> Long_term_payable VARCHAR(20), -> Specific_payable VARCHAR(20), -> Estimated_liabilities VARCHAR(20), -> Deferred_income_tax_liabilities VARCHAR(20), -> Other_non_current_liabilities VARCHAR(20), -> Total_non_current_liabilities VARCHAR(20), -> Total_liabilities VARCHAR(20), -> Paid_in_capital VARCHAR(20), -> Contributed_surplus VARCHAR(20), -> Treasury_stock VARCHAR(20), -> Earned_surplus VARCHAR(20), -> Retained_earnings VARCHAR(20), -> Translation_reserve VARCHAR(20), -> Nonrecurring_items VARCHAR(20), -> Total_equity(non) VARCHAR(20), -> Minority_interests VARCHAR(20), -> Total_equity VARCHAR(20), -> Total_liabilities_&_shareholder's_equity VARCHAR(20)); '> '> when i press enter,there is the output of ' ,no other reaction ,what's wrong?

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  • CSS - 100% Height Layout with Variable Height Header

    - by Brian D.
    The layout I want to achieve is pretty simple. I want a 100% height layout with a header, and below the header I will have a side bar for navigation and then the content area beside the navigation bar (2-column with header). I can easily do this if I give the header a specified height but I want the header to just take up as much room as is needed. Does anyone know how to do this? Is it possible without knowing the height of the header? Thanks for any help.

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  • Weird Excel Formatting

    - by Gage
    Recently a new co-op was hired at our company and has been tasked to run a report. The report queries the database and returns a resultset and from there procedes to create the spreadsheets. Depending on the number of days selected a different number of reports are generated but I do not believe that is relavent to the question. Basically it runs the reports and loops through the resultset but at some point continues to loop through until tow 65536 at which it stops. For Example if the resultset contained 74 records then the first 74 rows would appear normally (formatted yellow) while everything after that would also be formatted yellow although it should be left alone. I am inheriting this code as I to am a new co-op. Apparently this only happens when a "change of guards" happens (New co-op has to run the report).` DoCmd.SetWarnings False DoCmd.OpenQuery ("DailySummaryQueryMain") strSQL = "SELECT * FROM DailySummaryMain" Set rs = CurrentDb.OpenRecordset(strSQL) DoCmd.Echo True, "Running first Report" If Not rs.EOF Then rs.MoveFirst Do While Not rs.EOF And Not rs.BOF xlapp.Range("A" & i).Value = rs.Fields(0).Value xlapp.Range("B" & i).Value = rs.Fields(1).Value xlapp.Range("C" & i).Value = rs.Fields(2).Value Set rs2 = CurrentDb.OpenRecordset("SELECT dbo_StatusType.StatusTypeID, dbo_StatusType.Name FROM dbo_StatusType WHERE (((dbo_StatusType.StatusTypeID)=" & rs.Fields(3) & "))") rs2.MoveFirst xlapp.Range("D" & i).Value = rs2.Fields(1).Value xlapp.Range("E" & i).Value = rs.Fields(4).Value xlapp.Range("F" & i).Value = rs.Fields(5).Value xlapp.Range("G" & i).Value = rs.Fields(6).Value 'count number of outages that start and end on same day If Format(xlapp.Range("F" & i).Value, "mm/dd/yyyy") = Format(xlapp.Range("G" & i).Value, "mm/dd/yyyy") Then dayCount = dayCount + 1 End If xlapp.Range("H" & i).Value = rs.Fields(7).Value xlapp.Range("I" & i).Value = rs.Fields(8).Value xlapp.Range("J" & i).Value = rs.Fields(9).Value xlapp.Range("K" & i).Value = rs.Fields(10).Value xlapp.Range("L" & i).Value = rs.Fields(11).Value xlapp.Range("M" & i).Value = rs.Fields(12).Value xlapp.Range("N" & i).Value = rs.Fields(13).Value 'highlite recently modified rows If rs.Fields(14).Value = "Yes" Then xlapp.Range("A" & i & ":N" & i).Select With xlapp.Selection.Interior .ColorIndex = 36 .Pattern = xlSolid End With End If 'break apart by sector If CInt(rs.Fields(2).Value) = 1 Then row = row1 ElseIf CInt(rs.Fields(2).Value) = 2 Then row = row2 ElseIf CInt(rs.Fields(2).Value) = 3 Then row = row3 Else row = row4 End If xlapp.Worksheets(CInt(rs.Fields(2).Value) + 1).Activate xlapp.Range("A" & row).Value = rs.Fields(0).Value xlapp.Range("B" & row).Value = rs.Fields(1).Value xlapp.Range("C" & row).Value = rs.Fields(13).Value xlapp.Range("D" & row).Value = rs.Fields(4).Value xlapp.Range("E" & row).Value = rs.Fields(5).Value xlapp.Range("F" & row).Value = rs.Fields(6).Value xlapp.Range("G" & row).Value = rs.Fields(7).Value xlapp.Range("H" & row).Value = rs.Fields(8).Value xlapp.Range("I" & row).Value = rs.Fields(9).Value xlapp.Range("J" & row).Value = rs.Fields(10).Value xlapp.Range("K" & row).Value = "" xlapp.Range("L" & row).Value = rs.Fields(11).Value xlapp.Range("M" & row).Value = rs.Fields(13).Value If CInt(rs.Fields(2).Value) = 1 Then row1 = row1 + 1 ElseIf CInt(rs.Fields(2).Value) = 2 Then row2 = row2 + 1 ElseIf CInt(rs.Fields(2).Value) = 3 Then row3 = row3 + 1 Else row4 = row4 + 1 End If 'activate main summary sheet for next outage xlapp.Worksheets(1).Activate i = i + 1 rs.MoveNext Loop` Also I should note that this is all happening within an access database which has its tables linked from SQL. The query is extremely slow to run from which I believe is the use of views but thats neither here nor there. All you have to know is attempting to debug takes an enormous amount of time due to having to wait for the recordset to return. My guess is that its not checking to see if the resultset is empty correctly. Is there a way I could check to see if theres a value is rs.Fields(0) and base it off that maybe? That is the ID column and there should always be a value. I am wondering why rs.EOF isn't catching this though.

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  • Best practices concerning view model and model updates with a subset of the fields

    - by Martin
    By picking MVC for developing our new site, I find myself in the midst of "best practices" being developed around me in apparent real time. Two weeks ago, NerdDinner was my guide but with the development of MVC 2, even it seems outdated. It's an thrilling experience and I feel privileged to be in close contact with intelligent programmers daily. Right now I've stumbled upon an issue I can't seem to get a straight answer on - from all the blogs anyway - and I'd like to get some insight from the community. It's about Editing (read: Edit action). The bulk of material out there, tutorials and blogs, deal with creating and view the model. So while this question may not spell out a question, I hope to get some discussion going, contributing to my decision about the path of development I'm to take. My model represents a user with several fields like name, address and email. All the names, in fact, on field each for first name, last name and middle name. The Details view displays all these fields but you can change only one set of fields at a time, for instance, your names. The user expands a form while the other fields are still visible above and below. So the form that is posted back contains a subset of the fields representing the model. While this is appealing to us and our layout concerns, for various reasons, it is to be shunned by serious MVC-developers. I've been reading about some patterns and best practices and it seems that this is not in key with the paradigm of viewmodel == view. Or have I got it wrong? Anyway, NerdDinner dictates using FormCollection och UpdateModel. All the null fields are happily ignored. Since then, the MVC-community has abandoned this approach to such a degree that a bug in MVC 2 was not discovered. UpdateModel does not work without a complete model in your formcollection. The view model pattern receiving most praise seems to be Dedicated view model that contains a custom view model entity and is the only one that my design issue could be made compatible with. It entails a tedious amount of mapping, albeit lightened by the use of AutoMapper and the ideas of Jimmy Bogard, that may or may not be worthwhile. He also proposes a 1:1 relationship between view and view model. In keeping with these design paradigms, I am to create a view and associated view for each of my expanding sets of fields. The view models would each be nearly identical, differing only in the fields which are read-only, the views also containing much repeated markup. This seems absurd to me. In future I may want to be able to display two, more or all sets of fields open simultaneously. I will most attentively read the discussion I hope to spark. Many thanks in advance.

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  • How to use references, avoid header bloat, and delay initialization?

    - by Kyle
    I was browsing for an alternative to using so many shared_ptrs, and found an excellent reply in a comment section: Do you really need shared ownership? If you stop and think for a few minutes, I'm sure you can pinpoint one owner of the object, and a number of users of it, that will only ever use it during the owner's lifetime. So simply make it a local/member object of the owners, and pass references to those who need to use it. I would love to do this, but the problem becomes that the definition of the owning object now needs the owned object to be fully defined first. For example, say I have the following in FooManager.h: class Foo; class FooManager { shared_ptr<Foo> foo; shared_ptr<Foo> getFoo() { return foo; } }; Now, taking the advice above, FooManager.h becomes: #include "Foo.h" class FooManager { Foo foo; Foo& getFoo() { return foo; } }; I have two issues with this. First, FooManager.h is no longer lightweight. Every cpp file that includes it now needs to compile Foo.h as well. Second, I no longer get to choose when foo is initialized. It must be initialized simultaneously with FooManager. How do I get around these issues?

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