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  • C#: How to find the default value for a run-time Type?

    - by George Mauer
    So given a static type in your code you can do var defaultMyTypeVal = default(MyType); How would you do the same thing given a variable of Type so you can use it during runtime? In other words how do I implement the following method without a bunch of if statements or using Generics (because I will not know the type I'm passing into the method at compile time)? public object GetDefaultValueForType(Type type) { .... }

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  • How can I set default seed for all identities within a SQL Server database?

    - by Brandon DuRette
    Is there a way to tell SQL server to use specific default seed value for IDENTITY columns - assuming the (to be run) CREATE TABLE statements do not specify one? I don't really care about altering existing data or altering the seed values for specific IDENTITY columns. I want the same seed for all newly created identity columns. Assume I cannot modify the individual CREATE TABLE statements in any way.

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  • Which is the better C# class design for dealing with read+write versus readonly

    - by DanM
    I'm contemplating two different class designs for handling a situation where some repositories are read-only while others are read-write. (I don't foresee any need to a write-only repository.) Class Design 1 -- provide all functionality in a base class, then expose applicable functionality publicly in sub classes public abstract class RepositoryBase { protected virtual void SelectBase() { // implementation... } protected virtual void InsertBase() { // implementation... } protected virtual void UpdateBase() { // implementation... } protected virtual void DeleteBase() { // implementation... } } public class ReadOnlyRepository : RepositoryBase { public void Select() { SelectBase(); } } public class ReadWriteRepository : RepositoryBase { public void Select() { SelectBase(); } public void Insert() { InsertBase(); } public void Update() { UpdateBase(); } public void Delete() { DeleteBase(); } } Class Design 2 - read-write class inherits from read-only class public class ReadOnlyRepository { public void Select() { // implementation... } } public class ReadWriteRepository : ReadOnlyRepository { public void Insert() { // implementation... } public void Update() { // implementation... } public void Delete() { // implementation... } } Is one of these designs clearly stronger than the other? If so, which one and why? P.S. If this sounds like a homework question, it's not, but feel free to use it as one if you want :)

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  • How do I cast a void pointer to a struct in C?

    - by Rowhawn
    In a project I'm writing code for, I have a void pointer, "implementation", which is a member of a "Hash_map" struct, and points to an "Array_hash_map" struct. The concepts behind this project are not very realistic, but bear with me. The specifications of the project ask that I cast the void pointer "implementation" to an "Array_hash_map" before I can use it in any functions. My question, specifically is, what do I do in the functions to cast the void pointers to the desired struct? Is there one statement at the top of each function that casts them or do I make the cast every time I use "implementation"? Here are the typedefs the structs of a Hash_map and Array_hash_map as well as a couple functions making use of them. typedef struct { Key_compare_fn key_compare_fn; Key_delete_fn key_delete_fn; Data_compare_fn data_compare_fn; Data_delete_fn data_delete_fn; void *implementation; } Hash_map; typedef struct Array_hash_map{ struct Unit *array; int size; int capacity; } Array_hash_map; typedef struct Unit{ Key key; Data data; } Unit; functions: /* Sets the value parameter to the value associated with the key parameter in the Hash_map. */ int get(Hash_map *map, Key key, Data *value){ int i; if (map == NULL || value == NULL) return 0; for (i = 0; i < map->implementation->size; i++){ if (map->key_compare_fn(map->implementation->array[i].key, key) == 0){ *value = map->implementation->array[i].data; return 1; } } return 0; } /* Returns the number of values that can be stored in the Hash_map, since it is represented by an array. */ int current_capacity(Hash_map map){ return map.implementation->capacity; }

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  • How to remove default header from WCF REST Outgoing Response?

    - by bmsantos
    The following C# WCF based REST service gives me some undesired headers that I'm not sure if I can remove them trough the API. The interface: [ServiceContract] public interface IControlSystem { [OperationContract] [WebGet] System.IO.Stream About(); } The implementation: public class ControlSystem : IControlSystem { public System.IO.Stream About() { return new System.IO.MemoryStream(ASCIIEncoding.Default.GetBytes("Hello World")); } } Out of a raw socket connection it gives the following response: HTTP/1.1 200 OK Server: ASP.NET Development Server/9.0.0.0 Date: Tue, 15 Jun 2010 13:12:51 GMT X-AspNet-Version: 2.0.50727 Cache-Control: private Content-Type: application/octet-stream Content-Length: 39 Connection: Close Hello World Question is, is it possible to get the server to not report anything other than the actual message? Need it in some calls so due to some small embedded device clients that will try to connect to the server and I would like to minimize the amount of parsing. Thanks, B.

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  • Conflict between two Javascripts (MailChimp validation etc. scripts & jQuery hSlides.js)

    - by Brian
    I have two scripts running on the same page, one is the jQuery.hSlides.js script http://www.jesuscarrera.info/demos/hslides/ and the other is a custom script that is used for MailChimp list signup integration. The hSlides panel can be seen in effect here: http://theatricalbellydance.com. I've turned off the MailChimp script because it was conflicting with the hSlides script, causing it not to to fail completely (as seen here http://theatricalbellydance.com/home2/). Can someone tell me what could be done to the hSlides script to stop the conflict with the MailChimp script? The MailChimp Script var fnames = new Array(); var ftypes = new Array(); fnames[0] = 'EMAIL'; ftypes[0] = 'email'; fnames[3] = 'MMERGE3'; ftypes[3] = 'text'; fnames[1] = 'FNAME'; ftypes[1] = 'text'; fnames[2] = 'LNAME'; ftypes[2] = 'text'; fnames[4] = 'MMERGE4'; ftypes[4] = 'address'; fnames[6] = 'MMERGE6'; ftypes[6] = 'number'; fnames[9] = 'MMERGE9'; ftypes[9] = 'text'; fnames[5] = 'MMERGE5'; ftypes[5] = 'text'; fnames[7] = 'MMERGE7'; ftypes[7] = 'text'; fnames[8] = 'MMERGE8'; ftypes[8] = 'text'; fnames[10] = 'MMERGE10'; ftypes[10] = 'text'; fnames[11] = 'MMERGE11'; ftypes[11] = 'text'; fnames[12] = 'MMERGE12'; ftypes[12] = 'text'; var err_style = ''; try { err_style = mc_custom_error_style; } catch (e) { err_style = 'margin: 1em 0 0 0; padding: 1em 0.5em 0.5em 0.5em; background: rgb(255, 238, 238) none repeat scroll 0% 0%; font-weight: bold; float: left; z-index: 1; width: 80%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; color: rgb(255, 0, 0);'; } var mce_jQuery = jQuery.noConflict(); mce_jQuery(document).ready(function ($) { var options = { errorClass: 'mce_inline_error', errorElement: 'div', errorStyle: err_style, onkeyup: function () {}, onfocusout: function () {}, onblur: function () {} }; var mce_validator = mce_jQuery("#mc-embedded-subscribe-form").validate(options); options = { url: 'http://theatricalbellydance.us1.list-manage.com/subscribe/post-json?u=1d127e7630ced825cb1a8b5a9&id=9f12d2a6bb&c=?', type: 'GET', dataType: 'json', contentType: "application/json; charset=utf-8", beforeSubmit: function () { mce_jQuery('#mce_tmp_error_msg').remove(); mce_jQuery('.datefield', '#mc_embed_signup').each(function () { var txt = 'filled'; var fields = new Array(); var i = 0; mce_jQuery(':text', this).each(function () { fields[i] = this; i++; }); mce_jQuery(':hidden', this).each(function () { if (fields[0].value == 'MM' && fields[1].value == 'DD' && fields[2].value == 'YYYY') { this.value = ''; } else if (fields[0].value == '' && fields[1].value == '' && fields[2].value == '') { this.value = ''; } else { this.value = fields[0].value + '/' + fields[1].value + '/' + fields[2].value; } }); }); return mce_validator.form(); }, success: mce_success_cb }; mce_jQuery('#mc-embedded-subscribe-form').ajaxForm(options); }); function mce_success_cb(resp) { mce_jQuery('#mce-success-response').hide(); mce_jQuery('#mce-error-response').hide(); if (resp.result == "success") { mce_jQuery('#mce-' + resp.result + '-response').show(); mce_jQuery('#mce-' + resp.result + '-response').html(resp.msg); mce_jQuery('#mc-embedded-subscribe-form').each(function () { this.reset(); }); } else { var index = -1; var msg; try { var parts = resp.msg.split(' - ', 2); if (parts[1] == undefined) { msg = resp.msg; } else { i = parseInt(parts[0]); if (i.toString() == parts[0]) { index = parts[0]; msg = parts[1]; } else { index = -1; msg = resp.msg; } } } catch (e) { index = -1; msg = resp.msg; } try { if (index == -1) { mce_jQuery('#mce-' + resp.result + '-response').show(); mce_jQuery('#mce-' + resp.result + '-response').html(msg); } else { err_id = 'mce_tmp_error_msg'; html = '<div id="' + err_id + '" style="' + err_style + '"> ' + msg + '</div>'; var input_id = '#mc_embed_signup'; var f = mce_jQuery(input_id); if (ftypes[index] == 'address') { input_id = '#mce-' + fnames[index] + '-addr1'; f = mce_jQuery(input_id).parent().parent().get(0); } else if (ftypes[index] == 'date') { input_id = '#mce-' + fnames[index] + '-month'; f = mce_jQuery(input_id).parent().parent().get(0); } else { input_id = '#mce-' + fnames[index]; f = mce_jQuery().parent(input_id).get(0); } if (f) { mce_jQuery(f).append(html); mce_jQuery(input_id).focus(); } else { mce_jQuery('#mce-' + resp.result + '-response').show(); mce_jQuery('#mce-' + resp.result + '-response').html(msg); } } } catch (e) { mce_jQuery('#mce-' + resp.result + '-response').show(); mce_jQuery('#mce-' + resp.result + '-response').html(msg); } } } The hslides script: /* * hSlides (1.0) // 2008.02.25 // <http://plugins.jquery.com/project/hslides> * * REQUIRES jQuery 1.2.3+ <http://jquery.com/> * * Copyright (c) 2008 TrafficBroker <http://www.trafficbroker.co.uk> * Licensed under GPL and MIT licenses * * hSlides is an horizontal accordion navigation, sliding the panels around to reveal one of interest. * * Sample Configuration: * // this is the minimum configuration needed * $('#accordion').hSlides({ * totalWidth: 730, * totalHeight: 140, * minPanelWidth: 87, * maxPanelWidth: 425 * }); * * Config Options: * // Required configuration * totalWidth: Total width of the accordion // default: 0 * totalHeight: Total height of the accordion // default: 0 * minPanelWidth: Minimum width of the panel (closed) // default: 0 * maxPanelWidth: Maximum width of the panel (opened) // default: 0 * // Optional configuration * midPanelWidth: Middle width of the panel (centered) // default: 0 * speed: Speed for the animation // default: 500 * easing: Easing effect for the animation. Other than 'swing' or 'linear' must be provided by plugin // default: 'swing' * sensitivity: Sensitivity threshold (must be 1 or higher) // default: 3 * interval: Milliseconds for onMouseOver polling interval // default: 100 * timeout: Milliseconds delay before onMouseOut // default: 300 * eventHandler: Event to open panels: click or hover. For the hover option requires hoverIntent plugin <http://cherne.net/brian/resources/jquery.hoverIntent.html> // default: 'click' * panelSelector: HTML element storing the panels // default: 'li' * activeClass: CSS class for the active panel // default: none * panelPositioning: Accordion panelPositioning: top -> first panel on the bottom and next on the top, other value -> first panel on the top and next to the bottom // default: 'top' * // Callback funtctions. Inside them, we can refer the panel with $(this). * onEnter: Funtion raised when the panel is activated. // default: none * onLeave: Funtion raised when the panel is deactivated. // default: none * * We can override the defaults with: * $.fn.hSlides.defaults.easing = 'easeOutCubic'; * * @param settings An object with configuration options * @author Jesus Carrera <[email protected]> */ (function($) { $.fn.hSlides = function(settings) { // override default configuration settings = $.extend({}, $.fn.hSlides.defaults, settings); // for each accordion return this.each(function(){ var wrapper = this; var panelLeft = 0; var panels = $(settings.panelSelector, wrapper); var panelPositioning = 1; if (settings.panelPositioning != 'top'){ panelLeft = ($(settings.panelSelector, wrapper).length - 1) * settings.minPanelWidth; panels = $(settings.panelSelector, wrapper).reverse(); panelPositioning = -1; } // necessary styles for the wrapper $(this).css('position', 'relative').css('overflow', 'hidden').css('width', settings.totalWidth).css('height', settings.totalHeight); // set the initial position of the panels var zIndex = 0; panels.each(function(){ // necessary styles for the panels $(this).css('position', 'absolute').css('left', panelLeft).css('zIndex', zIndex).css('height', settings.totalHeight).css('width', settings.maxPanelWidth); zIndex ++; // if this panel is the activated by default, set it as active and move the next (to show this one) if ($(this).hasClass(settings.activeClass)){ $.data($(this)[0], 'active', true); if (settings.panelPositioning != 'top'){ panelLeft = ($(settings.panelSelector, wrapper).index(this) + 1) * settings.minPanelWidth - settings.maxPanelWidth; }else{ panelLeft = panelLeft + settings.maxPanelWidth; } }else{ // check if we are centering and some panel is active // this is why we can't add/remove the active class in the callbacks: positioning the panels if we have one active if (settings.midPanelWidth && $(settings.panelSelector, wrapper).hasClass(settings.activeClass) == false){ panelLeft = panelLeft + settings.midPanelWidth * panelPositioning; }else{ panelLeft = panelLeft + settings.minPanelWidth * panelPositioning; } } }); // iterates through the panels setting the active and changing the position var movePanels = function(){ // index of the new active panel var activeIndex = $(settings.panelSelector, wrapper).index(this); // iterate all panels panels.each(function(){ // deactivate if is the active if ( $.data($(this)[0], 'active') == true ){ $.data($(this)[0], 'active', false); $(this).removeClass(settings.activeClass).each(settings.onLeave); } // set position of current panel var currentIndex = $(settings.panelSelector, wrapper).index(this); panelLeft = settings.minPanelWidth * currentIndex; // if the panel is next to the active, we need to add the opened width if ( (currentIndex * panelPositioning) > (activeIndex * panelPositioning)){ panelLeft = panelLeft + (settings.maxPanelWidth - settings.minPanelWidth) * panelPositioning; } // animate $(this).animate({left: panelLeft}, settings.speed, settings.easing); }); // activate the new active panel $.data($(this)[0], 'active', true); $(this).addClass(settings.activeClass).each(settings.onEnter); }; // center the panels if configured var centerPanels = function(){ var panelLeft = 0; if (settings.panelPositioning != 'top'){ panelLeft = ($(settings.panelSelector, wrapper).length - 1) * settings.minPanelWidth; } panels.each(function(){ $(this).removeClass(settings.activeClass).animate({left: panelLeft}, settings.speed, settings.easing); if ($.data($(this)[0], 'active') == true){ $.data($(this)[0], 'active', false); $(this).each(settings.onLeave); } panelLeft = panelLeft + settings.midPanelWidth * panelPositioning ; }); }; // event handling if(settings.eventHandler == 'click'){ $(settings.panelSelector, wrapper).click(movePanels); }else{ var configHoverPanel = { sensitivity: settings.sensitivity, interval: settings.interval, over: movePanels, timeout: settings.timeout, out: function() {} } var configHoverWrapper = { sensitivity: settings.sensitivity, interval: settings.interval, over: function() {}, timeout: settings.timeout, out: centerPanels } $(settings.panelSelector, wrapper).hoverIntent(configHoverPanel); if (settings.midPanelWidth != 0){ $(wrapper).hoverIntent(configHoverWrapper); } } }); }; // invert the order of the jQuery elements $.fn.reverse = function(){ return this.pushStack(this.get().reverse(), arguments); }; // default settings $.fn.hSlides.defaults = { totalWidth: 0, totalHeight: 0, minPanelWidth: 0, maxPanelWidth: 0, midPanelWidth: 0, speed: 500, easing: 'swing', sensitivity: 3, interval: 100, timeout: 300, eventHandler: 'click', panelSelector: 'li', activeClass: false, panelPositioning: 'top', onEnter: function() {}, onLeave: function() {} }; })(jQuery);

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  • Does MS Test provide a default value equals comparison?

    - by fearofawhackplanet
    I want to test for example int orderId = myRepository.SubmitOrder(orderA); orderB = myRepository.GetOrder(orderId); Assert.AreEqual(orderA, orderB); // fail Obviously I need a value comparison here, but I don't want to have to provide an overridden Equals implementation for all of my classes purely for the sake of testing (it wouldn't be of any use in the rest of the app). Is there a provided generic method that just checks every field using reflection? Or if not, it is possible to write my own?

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  • Solaris: Is it OK to disable font services?

    - by cjavapro
    Is it OK to disable these services? # svcs -l '*font*' fmri svc:/application/font/stfsloader:default name Standard Type Services Framework (STSF) Font Server loader enabled true state online next_state none state_time Sun May 30 17:58:14 2010 restarter svc:/network/inetd:default fmri svc:/application/font/fc-cache:default name FontConfig Cache Builder enabled true state online next_state none state_time Sun May 30 17:58:15 2010 logfile /var/svc/log/application-font-fc-cache:default.log restarter svc:/system/svc/restarter:default dependency require_all/none svc:/system/filesystem/local (online) dependency require_all/refresh file://localhost/etc/fonts/fonts.conf (online) dependency require_all/none file://localhost/usr/bin/fc-cache (online) #

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  • share git rep access on unix machine with ssh

    - by Daniel
    at my school we have a student unix server with our accounts. i have installed git on my account, created a repository, and created the acl permissions on the folder repository so other users can access the repository # file: tp1 # owner: my_account # group: groupxxx user::rwx user:friend_account:rwx group::--- mask::rwx other::--- default:user::rwx default:user:friend_account:rwx default:group::--- default:mask::rwx default:other::--- but friend_account cant even cd to my tp1 directory (permission denied), so i think the problem should be in unix acl permissions..

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  • Add keyboard languages to XP, Vista, and Windows 7

    - by Matthew Guay
    Do you regularly need to type in multiple languages in Windows?  Here we’ll show you the easy way to add and change input languages to your keyboard in XP, Vista, and Windows 7. Windows Vista and 7 come preinstalled with support for viewing a wide variety of languages, so adding an input language is fairly simply.  Adding an input language is slightly more difficult in XP, and requires installing additional files if you need an Asian or Complex script language.  First we show how to add an input language in Windows Vista and 7; it’s basically the same in both versions.  Then, we show how to add a language to XP, and also how to add Complex Script support.  Please note that this is only for adding an input language, which will allow you to type in the language you select.  This does not change your user interface language. Change keyboard language in Windows 7 and Vista It is fairly simple to add or change a keyboard language in Windows 7 or Vista.  In Windows 7, enter “keyboard language” in the Start menu search box, and select “Change keyboards or other input methods”. In Windows Vista, open Control Panel and enter “input language” in the search box and select “Change keyboards or other input methods”.  This also works in Windows 7. Now, click Change Keyboards to add another keyboard language or change your default one. Our default input language is US English, and our default keyboard is the US keyboard layout.  Click Add to insert another input language while still leaving your default input language installed. Here we selected the standard Thai keyboard language (Thai Kedmanee), but you can select any language you want.  Windows offers almost any language you can imagine, so just look for the language you want, select it, and click Ok. Alternately, if you want, you can click Preview to see your layout choice before accepting it.  This is only the default characters, not ones that will be activated with Shift or other keys (many Asian languages use many more characters than English, and require the use of Shift and other keys to access them all).  Once your finished previewing, click close and then press Ok on the previous dialog. Now you will see both of your keyboard languages in the Installed services box.  You can click Add to go back and get more, or move your selected language up or down (to change its priority), or simply click Apply to add the new language. Also, you can now change the default input language from the top menu.  This is the language that your keyboard will start with when you boot your computer.  So, if you mainly use English but also use another language, usually it is best to leave English as your default input language. Once you’ve pressed Apply or Ok, you will see a new icon beside your system tray with the initials of your default input language. If you click it, you can switch between input languages.  Alternately you can switch input languages by pressing Alt+Shift on your keyboard. Some complex languages, such as Chinese, may have extra buttons to change input modes to accommodate their large alphabet. If you would like to change the keyboard shortcut for changing languages, go back to the Input Languages dialog, and select the “Advanced Key Settings” tab.  Here you can change settings for Caps Lock and change or add key sequences to change between languages. Also, the On-Screen keyboard will display the correct keyboard language (here the keyboard is displaying Thai), which can be a helpful reference if your physical keyboard doesn’t have your preferred input language printed on it.  To open this, simply enter “On-Screen keyboard” in the start menu search, or click All Programs>Accessories>On-Screen keyboard. Change keyboard language in Windows XP The process for changing the keyboard language in Windows XP is slightly different.  Open Control Panel, and select “Date, Time, Language, and Regional Options”.   Select “Add other languages”. Now, click Details to add another language.  XP does not include support for Asian and complex languages by default, so if you need to add one of those languages we have details for that below. Click Add to add an input language. Select your desired language from the list, and choose your desired keyboard layout if your language offers multiple layouts.  Here we selected Canadian French with the default layout. Now you will see both of your keyboard languages in the Installed services box.  You can click Add to go back and add more, or move your selected language up or down (to change its priority), or simply click Apply to add the new language. Once you’ve pressed Apply or Ok, you will see a new icon beside your system tray with the initials of your default input language. If you click it, you can switch between input languages.  Alternately you can switch input languages by pressing Alt+Shift on your keyboard. If you would like to change the keyboard shortcut for changing languages, go back to the Input Languages dialog, and click the “Key Settings” button on the bottom of the dialog.  Here you can change settings for Caps Lock and change or add key sequences to change between languages. Add support to XP for Asian and Complex script languages Windows XP does not include support for Asian and Complex script languages by default, but you can easily add them to your computer.  This is useful if you wish to type in one of these languages, or simply want to read text written in these languages, since XP will not display these languages correctly if they are not installed.  If you wish to install Chinese, Japanese, and/or Korean, check the “Install files for East Asian languages” box.  Or, if you need to install a complex script language (including Arabic, Armenian, Georgian, Hebrew, the Indic languages, Thai, and Vietnamese), check the “Install files for complex script and right-to-left languages” box.   Choosing either of these options will open a prompt reminding you that this option will take up more disk space.  Support for complex languages will require around 10Mb of hard drive space, but East Asian language support may require 230 Mb or more free disk space.  Click Ok, and click apply to install your language files. You may have to insert your XP CD into your CD drive to install these files.  Insert the disk, and then click Ok. Windows will automatically copy the files, including fonts for these languages… …and then will ask you to reboot your computer to finalize the settings.  Click Yes, and then reopen the “Add other languages” dialog when your computer is rebooted, and add a language as before.     Now you can add Complex and/or Asian languages to XP, just as above.  Here is the XP taskbar language selector with Thai installed. Conclusion Unfortunately we haven’t found a way to add Asian and complex languages in XP without having an XP disc. If you know of a way, let us know in the comments. (No downloading the XP disc from torrent site answers please) Adding an input language is very important for bilingual individuals, and can also be useful if you simply need to occasionally view Asian or Complex languages in XP.  And by following the correct instructions for your version of Windows, it should be very easy to add, change, and remove input languages. Similar Articles Productive Geek Tips Show Keyboard Shortcut Access Keys in Windows VistaKeyboard Ninja: 21 Keyboard Shortcut ArticlesAnother Desktop Cube for Windows XP/VistaThe "Up" Keyboard Shortcut for Windows 7 or Vista ExplorerWhat is ctfmon.exe And Why Is It Running? 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  • BNF – how to read syntax?

    - by Piotr Rodak
    A few days ago I read post of Jen McCown (blog) about her idea of blogging about random articles from Books Online. I think this is a great idea, even if Jen says that it’s not exciting or sexy. I noticed that many of the questions that appear on forums and other media arise from pure fact that people asking questions didn’t bother to read and understand the manual – Books Online. Jen came up with a brilliant, concise acronym that describes very well the category of posts about Books Online – RTFM365. I take liberty of tagging this post with the same acronym. I often come across questions of type – ‘Hey, i am trying to create a table, but I am getting an error’. The error often says that the syntax is invalid. 1 CREATE TABLE dbo.Employees 2 (guid uniqueidentifier CONSTRAINT DEFAULT Guid_Default NEWSEQUENTIALID() ROWGUIDCOL, 3 Employee_Name varchar(60) 4 CONSTRAINT Guid_PK PRIMARY KEY (guid) ); 5 The answer is usually(1), ‘Ok, let me check it out.. Ah yes – you have to put name of the DEFAULT constraint before the type of constraint: 1 CREATE TABLE dbo.Employees 2 (guid uniqueidentifier CONSTRAINT Guid_Default DEFAULT NEWSEQUENTIALID() ROWGUIDCOL, 3 Employee_Name varchar(60) 4 CONSTRAINT Guid_PK PRIMARY KEY (guid) ); Why many people stumble on syntax errors? Is the syntax poorly documented? No, the issue is, that correct syntax of the CREATE TABLE statement is documented very well in Books Online and is.. intimidating. Many people can be taken aback by the rather complex block of code that describes all intricacies of the statement. However, I don’t know better way of defining syntax of the statement or command. The notation that is used to describe syntax in Books Online is a form of Backus-Naur notatiion, called BNF for short sometimes. This is a notation that was invented around 50 years ago, and some say that even earlier, around 400 BC – would you believe? Originally it was used to define syntax of, rather ancient now, ALGOL programming language (in 1950’s, not in ancient India). If you look closer at the definition of the BNF, it turns out that the principles of this syntax are pretty simple. Here are a few bullet points: italic_text is a placeholder for your identifier <italic_text_in_angle_brackets> is a definition which is described further. [everything in square brackets] is optional {everything in curly brackets} is obligatory everything | separated | by | operator is an alternative ::= “assigns” definition to an identifier Yes, it looks like these six simple points give you the key to understand even the most complicated syntax definitions in Books Online. Books Online contain an article about syntax conventions – have you ever read it? Let’s have a look at fragment of the CREATE TABLE statement: 1 CREATE TABLE 2 [ database_name . [ schema_name ] . | schema_name . ] table_name 3 ( { <column_definition> | <computed_column_definition> 4 | <column_set_definition> } 5 [ <table_constraint> ] [ ,...n ] ) 6 [ ON { partition_scheme_name ( partition_column_name ) | filegroup 7 | "default" } ] 8 [ { TEXTIMAGE_ON { filegroup | "default" } ] 9 [ FILESTREAM_ON { partition_scheme_name | filegroup 10 | "default" } ] 11 [ WITH ( <table_option> [ ,...n ] ) ] 12 [ ; ] Let’s look at line 2 of the above snippet: This line uses rules 3 and 5 from the list. So you know that you can create table which has specified one of the following. just name – table will be created in default user schema schema name and table name – table will be created in specified schema database name, schema name and table name – table will be created in specified database, in specified schema database name, .., table name – table will be created in specified database, in default schema of the user. Note that this single line of the notation describes each of the naming schemes in deterministic way. The ‘optionality’ of the schema_name element is nested within database_name.. section. You can use either database_name and optional schema name, or just schema name – this is specified by the pipe character ‘|’. The error that user gets with execution of the first script fragment in this post is as follows: Msg 156, Level 15, State 1, Line 2 Incorrect syntax near the keyword 'DEFAULT'. Ok, let’s have a look how to find out the correct syntax. Line number 3 of the BNF fragment above contains reference to <column_definition>. Since column_definition is in angle brackets, we know that this is a reference to notion described further in the code. And indeed, the very next fragment of BNF contains syntax of the column definition. 1 <column_definition> ::= 2 column_name <data_type> 3 [ FILESTREAM ] 4 [ COLLATE collation_name ] 5 [ NULL | NOT NULL ] 6 [ 7 [ CONSTRAINT constraint_name ] DEFAULT constant_expression ] 8 | [ IDENTITY [ ( seed ,increment ) ] [ NOT FOR REPLICATION ] 9 ] 10 [ ROWGUIDCOL ] [ <column_constraint> [ ...n ] ] 11 [ SPARSE ] Look at line 7 in the above fragment. It says, that the column can have a DEFAULT constraint which, if you want to name it, has to be prepended with [CONSTRAINT constraint_name] sequence. The name of the constraint is optional, but I strongly recommend you to make the effort of coming up with some meaningful name yourself. So the correct syntax of the CREATE TABLE statement from the beginning of the article is like this: 1 CREATE TABLE dbo.Employees 2 (guid uniqueidentifier CONSTRAINT Guid_Default DEFAULT NEWSEQUENTIALID() ROWGUIDCOL, 3 Employee_Name varchar(60) 4 CONSTRAINT Guid_PK PRIMARY KEY (guid) ); That is practically everything you should know about BNF. I encourage you to study the syntax definitions for various statements and commands in Books Online, you can find really interesting things hidden there. Technorati Tags: SQL Server,t-sql,BNF,syntax   (1) No, my answer usually is a question – ‘What error message? What does it say?’. You’d be surprised to know how many people think I can go through time and space and look at their screen at the moment they received the error.

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  • Let’s Get Social

    - by Kristin Rose
    v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} Normal 0 false false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} You can try to run from it like a bad Facebook picture but you can’t hide. Social media as we know it is quickly taking over our lives and is not going away any time soon. Though attempting to reach as many Twitter followers as Lady Gaga is daunting, learning how to leverage social media to meet your customer’s needs is not. For Oracle, this means interacting directly with our partners through our many social media outlets, and refraining from posting a mindless status on the pastrami on rye we ate for lunch today… though it was delicious. The “correct” way to go about social media is going to mean something different to each company. For example, sending a customer more than one friend request a day may not be the best way to get their attention, but using social media as a two-way marketing channel is. Oracle’s Partner Business Center’s (PBC) twitter handle was recently mentioned by Elateral as the “ideal way to engage with your market and use social media in the channel”. Why you ask? Because the PBC has two named social media leads manning the Twitter feed at all times, helping partners get the information and answers they need more quickly than a Justin Bieber video gone viral. So whether you want to post a video of your favorite customer attempting the Marshmallow challenge or tweet like there’s no tomorrow, be sure to follow @OraclePartnerBiz today, and see how they can help you achieve your next partner milestone with Oracle. Happy Socializing, The OPN Communications Team v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} Normal 0 false false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} Normal 0 false false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}

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