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  • Dynamically changing DVT Graph at Runtime

    - by mona.rakibe(at)oracle.com
    I recently came across this requirement where the customer wanted to change the graph type at run-time based on some selection. After some internal discussions we realized this can be best achieved by using af:switcher to toggle between multiple graphs. In this blog I will be sharing the sample that I build to demonstrate this.[Note] : In the below sample, every-time user changes graph type there is a server trip, so please use this approach with performance implications in mind.This sample can be downloaded  from DynamicGraph.zipSet-up: Create a BAM data control using employees DO (sample)(Refer this entry)Steps:Create the View Create a new JSF page .From component palette drag and drop "Select One Radio" into this page Enter some Label and click "Finish"In Property Editor set the "AutoSubmit" property to trueNow drag and drop "Switcher" from components into this page.In the Structure pane select the af:switcher right click and surround with "PanelGroupLayout"In Property Editor set the "PartialTriggers"  property of PanelGroupLayout to the id of af:selectOneRadioAgain in the Structure pane select the af:switcher right click and select "Insert inside af:switcher->facet"Enter Facet name (ex: pie)Again in the Structure pane select the af:switcher right click and select "Insert inside af:switcher->facet" Enter  another Facet name (ex: bar)From "Data Controls" drag and drop "Employees->Query"  into the pie facet as "Graph->Pie" (Pie: Sales_Number and Slices: Salesperson)From "Data Controls" drag and drop "Employees->Query"  into the bar facet as "Graph->Bar" (Bars :Sales_Number and X-axis : Salesperson).Now wire the switcher to the af:selectOneRadio using their "facetName" and "value" property respectively.Now run the page, notice that graph renders as per the selection by user.

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  • Tömörítés becslése - Compression Advisor

    - by lsarecz
    Az Oracle Database 11g verziójától már OLTP adatbázisok is hatékonyan tömöríthetok az Advanced Compression funkcióval. Nem csak a tárolandó adatok mennyisége csökken ezáltal felére, vagy akár negyedére, de az adatbázis teljesítménye is javulhat, amennyiben I/O korlátos a rendszer (és általában az). Hogy pontosan mekkora tömörítés várható az Advanced Compression bevezetésével, az kiválóan becsülheto a Compression Advisor eszközzel. Ez nem csak az OLTP tömörítés mértékét, de 11gR2 verziótól kezdve a HCC tömörítés arányát is becsülni tudja, amely Exadata Database Machine, Pillar Axiom illetve ZFS Storage alkalmazásával érheto el. A HCC tömörítés becsléséhez csak 11gR2 adatbázisra van szükség, nem kell hozzá a speciális célhardver (Exadata, Pillar, ZFS). A Compression Advisor valójában a DBMS_COMPRESSION package használatával érheto el. A package-hez tartozik 6 konstans, amellyel a kívánt tömörítési szintek választhatók ki: Constant Type Value Description COMP_NOCOMPRESS NUMBER 1 No compression COMP_FOR_OLTP NUMBER 2 OLTP compression COMP_FOR_QUERY_HIGH NUMBER 4 High compression level for query operations COMP_FOR_QUERY_LOW NUMBER 8 Low compression level for query operations COMP_FOR_ARCHIVE_HIGH NUMBER 16 High compression level for archive operations COMP_FOR_ARCHIVE_LOW NUMBER 32 Low compression level for archive operations A GET_COMPRESSION_RATIO tárolt eljárás elemzi a tömöríteni kívánt táblát. Mindig csak egy táblát, vagy opcionálisan annak egy partícióját tudja elemezni úgy, hogy a tábláról készít egy másolatot egy külön erre a célra kijelölt/létrehozott táblatérre. Amennyiben az elemzést egyszerre több tömörítési szintre futtatjuk, úgy a tábláról annyi másolatot készít. A jó közelítésu becslés (+-5%) feltétele, hogy táblánként/partíciónként minimum 1 millió sor legyen. 11gR1 esetében még a DBMS_COMP_ADVISOR csomag GET_RATIO eljárása volt használatos, de ez még nem támogatta a HCC becslést. Érdemes még megnézni és kipróbálni a Tyler Muth blogjában publikált formázó eszközt, amivel a compression advisor kimenete alakítható jól értelmezheto formátumúvá. Végül összegezném mit is tartalmaz az Advanced Compression opció, mivel gyakran nem világos a felhasználóknak miért kell fizetni: Data Guard Network Compression Data Pump Compression (COMPRESSION=METADATA_ONLY does not require the Advanced Compression option) Multiple RMAN Compression Levels (RMAN DEFAULT COMPRESS does not require the Advanced Compression option) OLTP Table Compression SecureFiles Compression and Deduplication Ez alapján RMAN esetében például a default compression (BZIP2) szint ingyen használható, viszont az új ZLIB Advanced Compression opciót igényel. A ZLIB hatékonyabban használja a CPU-t, azaz jóval gyorsabb, viszont kisebb tömörítési arány érheto el vele.

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  • Declarative View Objects (VOs) for better ADF performance

    - by Shay Shmeltzer
    Just got back from ODTUG's kscope13 conference which had a lot of good deep ADF content. In one of my session I ran out of time to do one of my demos, so I wanted to share it here instead. This is a demo of how Declarative View Objects can increase your application's performance. For those who are not familiar with declarative VOs, those are VOs that don't actually specify a hard coded query. Instead ADF creates their query at runtime, and it does it based on the data that is requested in your UI layer. This can be a huge saver of both DB resources and network resources. More in the documentation. Here is a quick example that shows you how using such a VO can automatically switch to a simpler SQL instead of a complex join when needed. (note while I demo with 11.1.2.* the feature is there in 11.1.1.* versions also). The demo also shows you how you can monitor the SQL that ADF BC issues to the database using the WebLogic logging feature in JDeveloper. As a side note, I would have loved to see more ADF developers attending Kscope. This demo was part of the "ADF intro" track at Kscope, In the advanced ADF track you would have been treated to a full tuning session about ADF with lots of other tips. Consider attending Kscope next year - it is going to be in Seattle this time.

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  • Introduction to LinqPad Driver for StreamInsight 2.1

    - by Roman Schindlauer
    We are announcing the availability of the LinqPad driver for StreamInsight 2.1. The purpose of this blog post is to offer a quick introduction into the new features that we added to the StreamInsight LinqPad driver. We’ll show you how to connect to a remote server, how to inspect the entities present of that server, how to compose on top of them and how to manage their lifetime. Installing the driver Info on how to install the driver can be found in an earlier blog post here. Establishing connections As you click on the “Add Connection” link in the left pane you will notice that now it’s possible to build the data context automatically. The new driver appears as an option in the upper list, and if you pick it you will open a connection dialog that lets you connect to a remote StreamInsight server. The connection dialog lets you specify the address of the remote server. You will notice that it’s possible to pick up the binding information from the configuration file of the LinqPad application (which is normally in the same folder as LinqPad.exe and is called LinqPad.exe.config). In order for the context to be generated you need to pick an application from the server. The control is editable hence you can create a new application if you don’t want to make changes to an existing application. If you choose a new application name you will be prompted for confirmation before this gets created. Once you click OK the connection is created and you can start issuing queries against the remote server. If there’s any connectivity error the connection is marked with a red X and you can see the error message informing you what went wrong (i.e., the remote server could not be reached etc.). The context for remote servers Let’s take a look at what happens after we are connected successfully. Every LinqPad query runs inside a context – think of it as a class that wraps all the code that you’re writing. If you’re connecting to a live server the context will contain the following: The application object itself. All entities present in this application (sources, sinks, subjects and processes). The picture below shows a snapshot of the left pane of LinqPad after a successful connection. Every entity on the server has a different icon which will allow users to figure out its purpose. You will also notice that some entities have a string in parentheses following the name. It should be interpreted as such: the first name is the name of the property of the context class and the second name is the name of the entity as it exists on the server. Not all valid entity names are valid identifier names so in cases where we had to make a transformation you see both. Note also that as you hover over the entities you get IntelliSense with their types – more on that later. Remoting is not supported As you play with the entities exposed by the context you will notice that you can’t read and write directly to/from them. If for instance you’re trying to dump the content of an entity you will get an error message telling you that in the current version remoting is not supported. This is because the entity lives on the remote server and dumping its content means reading the events produced by this entity into the local process. ObservableSource.Dump(); Will yield the following error: Reading from a remote 'System.Reactive.Linq.IQbservable`1[System.Int32]' is not supported. Use the 'Microsoft.ComplexEventProcessing.Linq.RemoteProvider.Bind' method to read from the source using a remote observer. This basically tells you that you can call the Bind() method to direct the output of this source to a sink that has to be defined on the remote machine as well. You can’t bring the results to the LinqPad window unless you write code specifically for that. Compose queries You may ask – what's the purpose of all that? After all the same information is present in the EventFlowDebugger, why bother with showing it in LinqPad? First of all, What gets exposed in LinqPad is not what you see in the debugger. In LinqPad we have a property on the context class for every entity that lives on the server. Because LinqPad offers IntelliSense we in fact have much more information about the entity, and more importantly we can compose with that entity very easily. For example, let’s say that this code creates an entity: using (var server = Server.Connect(...)) {     var a = server.CreateApplication("WhiteFish");     var src = a         .DefineObservable<int>(() => Observable.Range(0, 3))         .Deploy("ObservableSource"); If later we want to compose with the source we have to fetch it and then we can bind something to     a.GetObservable<int>("ObservableSource)").Bind(... This means that we had to know a bunch of things about this: that it’s a source, that it’s an observable, it produces a result with payload Int32 and it’s named “ObservableSource”. Only the second and last bits of information are present in the debugger, by the way. As you type in the query window you see that all the entities are present, you get IntelliSense support for them and it’s much easier to make sense of what’s available. Let’s look at a scenario where composition is plausible. With the new programming model it’s possible to create “cold” sources that are parameterized. There was a way to accomplish that even in the previous version by passing parameters to the adapters, but this time it’s much more elegant because the expression declares what parameters are required. Say that we hover the mouse over the ThrottledSource source – we will see that its type is Func<int, int, IQbservable<int>> - this in effect means that we need to pass two int parameters before we can get a source that produces events, and the type for those events is int – in the particular case of my example I had the source produce a range of integers and the two parameters were the start and end of the range. So we see how a developer can create a source that is not running yet. Then someone else (e.g. an administrator) can pass whatever parameters appropriate and run the process. Proxy Types Here’s an interesting scenario – what if someone created a source on a server but they forgot to tell you what type they used. Worse yet, they might have used an anonymous type and even though they can refer to it by name you can’t figure out how to use that type. Let’s walk through an example that shows how you can compose against types you don’t need to have the definition of. This is how we can create a source that returns an anonymous type: Application.DefineObservable(() => Observable.Range(1, 10).Select(i => new { I = i })).Deploy("O1"); Now if we refresh the connection we can see the new source named O1 appear in the list. But what’s more important is that we now have a type to work with. So we can compose a query that refers to the anonymous type. var threshold = new StreamInsightDynamicDriver.TypeProxies.AnonymousType1_0<int>(5); var filter = from i in O1              where i > threshold              select i; filter.Deploy("O2"); You will notice that the anonymous type defined with this statement: new { I = i } can now be manipulated by a client that does not have access to it because the LinqPad driver has generated another type in its stead, named StreamInsightDynamicDriver.TypeProxies.AnonymousType1_0. This type has all the properties and fields of the type defined on the server, except in this case we can instantiate values and use it to compose more queries. It is worth noting that the same thing works for types that are not anonymous – the test is if the LinqPad driver can resolve the type or not. If it’s not possible then a new type will be generated that approximates the type that exists on the server. Control metadata In addition to composing processes on top of the existing entities we can do other useful things. We can delete them – nothing new here as we simply access the entities through the Entities collection of the application class. Here is where having their real name in parentheses comes handy. There’s another way to find out what’s behind a property – dump its expression. The first line in the output tells us what’s the name of the entity used to build this property in the context. Runtime information So let’s create a process to see what happens. We can bind a source to a sink and run the resulting process. If you right click on the connection you can refresh it and see the process present in the list of entities. Then you can drag the process to the query window and see that you can have access to process object in the Processes collection of the application. You can then manipulate the process (delete it, read its diagnostic view etc.). Regards, The StreamInsight Team

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  • C# - How to store and reuse queries

    - by Jason Holland
    I'm learning C# by programming a real monstrosity of an application for personal use. Part of my application uses several SPARQL queries like so: const string ArtistByRdfsLabel = @" PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> SELECT DISTINCT ?artist WHERE {{ {{ ?artist rdf:type <http://dbpedia.org/ontology/MusicalArtist> . ?artist rdfs:label ?rdfsLabel . }} UNION {{ ?artist rdf:type <http://dbpedia.org/ontology/Band> . ?artist rdfs:label ?rdfsLabel . }} FILTER ( str(?rdfsLabel) = '{0}' ) }}"; string Query = String.Format(ArtistByRdfsLabel, Artist); I don't like the idea of keeping all these queries in the same class that I'm using them in so I thought I would just move them into their own dedicated class to remove clutter in my RestClient class. I'm used to working with SQL Server and just wrapping every query in a stored procedure but since this is not SQL Server I'm scratching my head on what would be the best for these SPARQL queries. Are there any better approaches to storing these queries using any special C# language features (or general, non C# specific, approaches) that I may not already know about?

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  • BIND9 DNS Server

    - by Stevecomptech
    I am trying to set up my own DNS server solaris 10, i used the setup guide from http://www.logiqwest.com/dataCenter/Demos/RunBooks/DNS/DNSsetup.html I tried to join windows xp clients to the domain i configured using the above guide but i was unable to join giving me these errors, An error occurred when DNS was queried for the service location (SRV) resource record used to locate adomain controller for domain MYDOMAIN.COM. The error was: "No records found for given DNS query." (error code 0x0000251D DNS_INFO_NO_RECORDS) The query was for the SRV record for _ldap._tcp.dc._msdcs.MYDOMAIN.COM Where could i be going wrong? Your assistance will highly be appreciated

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  • Working with Key Flex Fields in OAF

    - by PRajkumar
    1. Create a New Workspace and Project Right click Workspaces and click create New OA Workspace and name it as PRajkumarKFFDemo. Automatically a new OA Project will also be created. Name the project as KFFDemo and package as prajkumar.oracle.apps.fnd.kffdemo   2. Create a New Application Module (AM) Right Click on KFFDemo > New > ADF Business Components > Application Module Name -- KFFAM Package -- prajkumar.oracle.apps.fnd.kffdemo.server   Check Application Module Class: KFFAMImpl Generate JavaFile(s)   3. Create a New View Object (VO) Right click on KFFDemo > New > ADF Business Components > View Object Name -- KFFVO Package -- prajkumar.oracle.apps.fnd.kffdemo.server   Note - The VO is not based on any EO so click next and go to the query section and paste the query   SELECT  code_combination_id FROM    gl_code_combinations_kfv   In Step8 Check Object Class: KFFVOImpl -> Generate Java File -> Bind Variable Accessors   4. Add View Object to Root UI Application Module Right Click on KFFAM > Edit KFFAM > Data Model and shuttle KFFVO from Available View Objects to Data Model   5. Create a New Page Right click on KFFDemo > New > Web Tier > OA Components > Page Name -- KFFPG Package -- prajkumar.oracle.apps.fnd.kffdemo.webui   6. Select the KFFPG and go to the strcuture pane where a default region has been created   7. Select region1 and set the following properties:   Attribute Property ID PageLayoutRN AM Definition prajkumar.oracle.apps.fnd.kffdemo.server.KFFAM Window Title Key Flex Field Demo Window Title Key Flex Field Demo     8. Create Stack Layout Region Under Page Layout Region Right click PageLayoutRN > New > Region   Attribute Property ID MainRN AM Definition stackLayout   9. Create a New Item of type Flex under the Stack Layout Region Right click on MainRN > New > Item Set Following Properties for New Item --   Attribute Property ID KeyFlexItem Item Style Flex Prompt Accounting Key Flex Field Appl Short Name SQLGL Name GL# Type Key View Instance KFFVO1     10. Create Controller for page KFFPG Right Click on PageLayoutRN > Set New Controller Package Name: prajkumar.oracle.apps.fnd.kffdemo.webui Class Name: KFFCO   Write Following Code in KFFCO processRequest   public void processRequest(OAPageContext pageContext, OAWebBean webBean) {  super.processRequest(pageContext, webBean);    OAKeyFlexBean kffId = (OAKeyFlexBean)webBean.findIndexedChildRecursive("KeyFlexItem");    // Set the code combination lov   kffId.useCodeCombinationLOV(true);   //set the structure code for the item key flex    kffId.setStructureCode("FED_AFF");   //Set the attribute name to the item   kffId.setCCIDAttributeName("CodeCombinationId");  //Execute the Query   KFFAMImpl am = (KFFAMImpl)pageContext.getApplicationModule(webBean);   KFFVOImpl vo = (KFFVOImpl)am.findViewObject("KFFVO1");          if(!vo.isPreparedForExecution())   {          vo.executeQuery();   } }   Note -- If you do not want to see the key flex field is merging one then change the code in the controller class as below   kffId.useCodeCombinationLOV(false);   11. Use the below Query to find the Structure Code   SELECT  fif.application_id,                  fif.id_flex_code,                  fif.id_flex_name,                  fif.application_table_name,                   fif.description,                  fifs.id_flex_num,                  fifs.id_flex_structure_code,                  fifse.segment_name,                  fifse.segment_num,                  fifse.flex_value_set_id  FROM     fnd_id_flexs                    fif,                  fnd_id_flex_structures   fifs,                   fnd_id_flex_segments    fifse  WHERE  fif.application_id      = fifs.application_id  AND       fif.id_flex_code         = fifs.id_flex_code  AND       fifse.application_id   = fif.application_id  AND       fifse.id_flex_code      = fif.id_flex_code  AND       fifse.id_flex_num      = fifs.id_flex_num  AND       fif.id_flex_code         LIKE 'GL#' AND       fif.id_flex_name       LIKE 'Accounting Flexfield';   12. Congratulation you have successfully finished. Run Your page and Test Your Work        

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  • Getting Internal Name of a Share Point List Fields

    - by Gino Abraham
    Over the last 2 weeks i was developing a tool to migrate Lotus notes data base to Share point. The mapping between Lotus notes schema and share point list schema was done manually in an xml file for out tool. To map the columns we wanted internal names of each field. There are quite a few ways to achieve this, have explained few below. If you want internal names for one or 2 columns you can do so by navigating to the list setting and clicking on the column name. Once you are in column's details, you can check the query string of the page. The last item in the query string would be field's internal. Replace all "%5f" with '_' will give you the field internal name. In my case there were more than 80 columns. I used power shell to get the list of columns with details. Open windows Powershell and paste the following script after modifying the url and list name. [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint") $site = new-object Microsoft.SharePoint.SPSite(http://yousitecolurl) $web = $site.OpenWeb() $list = $web.Lists["yourlist name"] $list.Fields | Format-Table Title, InternalName, TypeAsString I also found a tool in Codeplex.com which can generate a wrapper class for a list. The wrapper class will give you the guid and internal name for all fields in the list.  You can download the tool from http://imtech.codeplex.com/ Just enter the url in the text box and hit open. All the site content will be listed at the left hand side, expand the list, right click and select generate wrapper class.

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  • Mac OSX Server 10.6 DNS Issues

    - by dallasclark
    The server was upgraded from 10.5 from 10.6, during the upgrade the Reverse Zones were lost so I tried to recreate these but found that it's best to delete all zones, definitions and start again. So I've started again and Reverse Zones are appearing but I'm still having issues. I receive the following errors (if they help) 01-Nov-2010 12:52:01.254 client 192.168.1.52#57051: view com.apple.ServerAdmin.DNS.public: query (cache) 'server.dev.home.gateway/A/IN' denied 01-Nov-2010 12:59:24.487 client 192.168.1.52#52858: view com.apple.ServerAdmin.DNS.public: query (cache) 'earth.server.dev.home.gateway/A/IN' denied At the moment I have the following setup in the DNS 1.168.192.in-addr.arpa. Reverse Zone 192.168.1.100 Reverse Mapping MacPro-Server.local. server.dev. Primary Zone server.dev. Machine 192.168.1.100 earth.server.dev. Alias server.dev.

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  • Prefilling an SMS on Mobile Devices with the sms: Uri Scheme

    - by Rick Strahl
    Popping up the native SMS app from a mobile HTML Web page is a nice feature that allows you to pre-fill info into a text for sending by a user of your mobile site. The syntax is a bit tricky due to some device inconsistencies (and quite a bit of wrong/incomplete info on the Web), but it's definitely something that's fairly easy to do.In one of my Mobile HTML Web apps I need to share a current location via SMS. While browsing around a page I want to select a geo location, then share it by texting it to somebody. Basically I want to pre-fill an SMS message with some text, but no name or number, which instead will be filled in by the user.What worksThe syntax that seems to work fairly consistently except for iOS is this:sms:phonenumber?body=messageFor iOS instead of the ? use a ';' (because Apple is always right, standards be damned, right?):sms:phonenumber;body=messageand that works to pop up a new SMS message on the mobile device. I've only marginally tested this with a few devices: an iPhone running iOS 6, an iPad running iOS 7, Windows Phone 8 and a Nexus S in the Android Emulator. All four devices managed to pop up the SMS with the data prefilled.You can use this in a link:<a href="sms:1-111-1111;body=I made it!">Send location via SMS</a>or you can set it on the window.location in JavaScript:window.location ="sms:1-111-1111;body=" + encodeURIComponent("I made it!");to make the window pop up directly from code. Notice that the content should be URL encoded - HTML links automatically encode, but when you assign the URL directly in code the text value should be encoded.Body onlyI suspect in most applications you won't know who to text, so you only want to fill the text body, not the number. That works as you'd expect by just leaving out the number - here's what the URLs look like in that case:sms:?body=messageFor iOS same thing except with the ;sms:;body=messageHere's an example of the code I use to set up the SMS:var ua = navigator.userAgent.toLowerCase(); var url; if (ua.indexOf("iphone") > -1 || ua.indexOf("ipad") > -1) url = "sms:;body=" + encodeURIComponent("I'm at " + mapUrl + " @ " + pos.Address); else url = "sms:?body=" + encodeURIComponent("I'm at " + mapUrl + " @ " + pos.Address); location.href = url;and that also works for all the devices mentioned above.It's pretty cool that URL schemes exist to access device functionality and the SMS one will come in pretty handy for a number of things. Now if only all of the URI schemes were a bit more consistent (damn you Apple!) across devices...© Rick Strahl, West Wind Technologies, 2005-2013Posted in IOS  JavaScript  HTML5   Tweet !function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); (function() { var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true; po.src = 'https://apis.google.com/js/plusone.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s); })();

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  • JQuery / JSON + .Net Service Layer - to WCF or Not to WCF?

    - by hanzolo
    I Recently had a discussion with a colleague of mine about the pros / cons of WCF. He mentioned about how much code is generated to support WCF, and also the overhead required. It was mentioned that a simple jQuery /Ajax post to a .aspx page (or a handler for that matter) that returns JSON would work more efficiently and takes much less code to implement. I am also aware of the new WCF Web API and feel that technology may solve the "bloated"-ness required in attaining a proxy etc... by just outputting JSON. So when developing a relational DB (MSSQL) storage model, with a fairly complex Business Layer (C#) and Data Access Layer (EntityFW).. what's a good technology for creating a "service layer" which will spit out View Models represented in JSON, with a CQRS(Command Query..) approach in mind.. The app would use the service layer to support it's required UI, as well as provide an available subset of services (outputting JSON data) for service subscribers.. In other words an admin panel to support the admin UI, and service endpoints that return JSON to access the configurations made from the administration UI. What are some potential technologies to use as the transport / communication layer. I'd like to use a pure RESTful approach, but am not against doing some URL rewriting with IIS. Obviously some of the available technologies are: WCF WCF Web API (should this even be separate?) Straight request / response (query string to .aspx / handler) Would using MVC .Net solve this entire problem? maybe their single page app approach? any suggestions / feedback from developing this type of application? Thanks,

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  • 45 minutes to talk about C# [closed]

    - by Philip
    I have the opportunity to give a 45 minute talk on C# in the theory of programming languages class I'm taking. The college teaches Java almost exclusively, so that's what all the students are most familiar with. (There's a little C, assembly, Prolog and LISP as well.) I decide what to talk about. It seems to me the best approach is to focus on a few of the big, obvious differences between C# and Java. I don't intend it to be a recommendation to use C# -- there are reasons to use each, mostly because of their ecosystems. So I want to focus on C# as a language. I don't want to go too fast and end up listing a whole bunch of features without showing their usefulness. My current plan is this: Functions as first class objects. This is, in my opinion, one of the biggest differences between C# and Java. The professor briefly mentioned this notion and showed a LISP example, but many of the students have probably never used it. I can show real world examples where it's made my code more readable. Lambda expressions as concise syntax for anonymous functions. Obviously with examples to show how this is useful. The real hit-home examples will be at the end when it's combined with the rest. I don't see an advantage to first showing the old delegate syntax and then replacing it with lambdas -- most of us won't have ever seen delegates anyway so it would just be confusing. The yield keyword and how it's different from returning an array. I have the impression that a lot of C# developers aren't familiar with how to use this. It will likely be very foreign to Java developers. I have some examples from my own work where it was really useful, such as iterating over a tree traversal, or iterating over neighbors in a graph where the neighbors aren't stored in memory. In both cases, doing it in Java would likely mean returning a complete list -- with yield I can stop iterating if I find what I want early on, without using memory for superfluous lists or arrays. Extension methods as a way to write implementation on interfaces. We'll all be familiar with how interfaces don't allow method implementation, and how this leads to code duplication. I'll show a specific example of this and how the extension method can solve the problem. Demonstrate how the above can be combined by implementing some simple Linq methods and using them. Where, Select, First, maybe more depending on how much time is left. Ideas on which ones might 'hit home' the best? There are other things I could talk about such as generics, value types, properties and more. I haven't yet though of good ways to incorporate these. In the case of generics and value types, the advantages might not be obvious or as relevant. Properties are obviously useful, particularly since we're taught strict JavaBeans here, but I don't know if I could integrate it with the "path to Linq" discussion above without it feeling tacked on. So I'm looking for thoughts on how to talk about C#, and what to talk about. Even minor details. I'm sure there are more experienced C# developers than me here who have good insight about what's really important in the language, and what would miss the point.

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  • ArchBeat Link-o-Rama Top 10 for September 2-8, 2012

    - by Bob Rhubart
    The Top 10 items shared on the OTN Facebook Page for the week of September 2-8, 2012. Adding a runtime LOV for a taskflow parameter in WebCenter | Yannick Ongena Oracle ACE Yannick Ongena illustrates how to customize the parameters tab for a taskflow in WebCenter. Tips on Migrating from AquaLogic .NET Accelerator to WebCenter WSRP Producer for .NET | Scott Nelson "It has been a very winding path and this blog entry is intended to share both the lessons learned and relevant approaches that led to those learnings," says Scott Nelson. "Like most journeys of discovery, it was not a direct path, and there are notes to let you know when it is practical to skip a section if you are in a hurry to get from here to there." Free Event: Oracle Technology Network Architect Day – Boston, MA – 9/12/2012 Sure, you could ask a voodoo priestess for help in improving your solution architecture skills. But there's the whole snake thing, and the zombie thing, and other complications. So why not keep it simple and register for Oracle Technology Network Architect Day in Boston, MA. There's no magic, just a full day of technical sessions covering Cloud, SOA, Engineered Systems, and more. Registration is free, but seating is limited. You'll curse yourself if you miss this one. Starting and Stopping Fusion Applications the Right Way | Ronaldo Viscuso While the fastartstop tool that ships with Oracle Fusion Applications does most of the work to start/stop/bounce the Fusion Apps environment, it does not do it all. Oracle Fusion Applications A-Team blogger Ronaldo Viscuso's post "aims to explain all tasks involved in starting and stopping a Fusion Apps environment completely." Article Index: Architect Community Column in Oracle Magazine Did you know that Oracle Magazine features a regular column devoted specifically to the architect community? Every issue includes insight and expertise from architects who regularly work with Oracle Technologies. Click here to see a complete list of these articles. Using FMAP and AnalyticsRes in a Oracle BI High Availability Implementation | Art of Business Intelligence "The fmap syntax has been used for a long time in Oracle BI / Siebel Analytics when referencing images inherent in the application as well as custom images," says Oracle ACE Christian Screen. "This syntax is used on Analysis requests an dashboards." Dodeca Customer Feedback - The Rosewood Company | Tim Tow Oracle ACE Director Tim Tow shares anecdotal comments from one of his clients, a company that is deploying Dodeca to replace an aging VBA/Essbase application. Configuring UCM cache to check for external Content Server changes | Martin Deh Oracle WebCenter and ADF A-Team blogger shares the background information and the solution to a recently encountered customer scenario. Attend OTN Architect Day in Los Angeles – by Architects, for Architects – October 25 The OTN Architect Day roadshow stops in Boston next week, then it's on to Los Angeles for another all architecture, all day event on Thursday October 25, 2012 at the Sofitel Los Angeles, 555 Beverly Boulevard, Los Angeles, CA 90048. Like all Architect Day events, this one is absolutley free, so register now. The Role of Oracle VM Server for SPARC In a Virtualization Strategy New OTN article from Matthias Pfutzner. Thought for the Day "Practicing architects, through eduction, experience and examples, accumulate a considerable body of contextual sense by the time they're entrusted with solving a system-level problem…" — Eberhardt Rechtin (January 16, 1926 – April 14, 2006) Source: SoftwareQuotes.com

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  • Visual Basic link to SQL output to Word

    - by CLO_471
    I am in need of some advice/references. I am currently trying to develop a legal document interface. There are certain fields in which I need to query out of my sql db and have those fields output into a document that can be printed. I am trying to develop a user interface where people can enter fields that will output to a document template but at the same time I need the template to be able to pull data from the SQL database. This is the reason why I think that VB might be my best choice and because it is one of the only OOP languages I am familiar with presently. Does anyone know that best way to be able to handle this type of job?? I know that you can use VBA within MS Word and have the form output variables to a word template. But, is there a way to have the word document also pull information from the SQL db? Is the best option to use VB linked to SQL and run queries to get the information from the database and then have it output to a for within VB? Is it possible for VB to be linked to a SQL db and output variables and SQL fields to a Word Template? I have looked into Mail Merge and I see that it allows users to pull data from an Access query but I dont think it would be easy to automate and it seems that users would need to have an advanced knowledge of MS Word and Access to handle this. I am not finding much useful information online so I came here. Any advice or references would be greatly appreciated. If there is a better way please let me know.

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  • Yahoo search: different results shown in two identical searches

    - by Marco Demaio
    Hello,simple question: searching on http://www.yahoo.it for villa matrimonio bologna I noticed Yahoo shows different results. You need to retry few times to get this done maybe exiting the browser and openeing it again, or maybe searching once and then clearing browser cookies and then search again (it's even easier to test if you use two different browsers at the same time to search for the same phrase). Anyway in order to reproduce this easily I write down here the query shown in the address bar after the search, so you can just click on these to see the results shown by entering these query: http://it.search.yahoo.com/search;_ylt=AirvLYKvBMPP_6MpAmONN14brK5_?vc=&p=villa+matrimonio+bologna&toggle=1&cop=mss&ei=UTF-8&fr=yfp-t-709 http://it.search.yahoo.com/search;_ylt=AirvLYKvBMPP_6MpAmONN14brK5_?vc=&p=villa+matrimonio+bologna&toggle=1&cop=mss&ei=UTF-8&fr=sfp Note the last parameter fr is different, but it's Yahoo that set it (not me), I don't even know what it means. You can see in the search box that the searched phrase is IDENTICAL in both cases. So why Yahoo is giving out different results on same search phrase? I used the same browser and performed the test in few minutes by simply trying more than once. You may also notice that the number of results returned (written on the left side of the page) is different, for the 1st search it returns 274K results, for the 2nd one 5.38M results. Actually you might think that this is just an error on Yahoo, but it's almost 1 year that while looking once in a while at some websites to see how they are ranking on Yahoo and also Google, I noticed that two searches on the same phrase show up different results even on the same day after few minutes/hours. I couldn't reproduce this behaviour also on Google so I can not say for sure, but since it seems to me it happened sometimes I was wondering if anyone of you noticed it too. Do you know if this is the normal behaviour of search engines? Because if it's normal (and it's just me that noticed it only now) I wonder how do you understand how well a site is ranking on a search engine, you could even see one of your customer's website ranking differently compared to what your customer sees on his PC.

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  • LDAP Bind request failing

    - by Madhur Ahuja
    I have a Windows Server 2008 R2 Active Directory domain controller with domain madhurmoss.com I have a Linux box which is trying to connect to LDAP (389) on above box, which is failing. Upon inspection in Wireshark, I see a bind request with following query sAMAccountName=Administrator,DC=madhurmoss,DC=com and result with invalid Credentials 80090308: LdapErr: DSID-0C0903A9, comment: AcceptSecurityContext error, data 52e, v1db0 I want it to connect it through Administrator which lies in CN=Administrator,CN=Users,DC=madhurmoss,DC=com The supplied credentials are correct. I believe the query sAMAccountName=Administrator,DC=madhurmoss,DC=com is wrong. Can anyone guide me what could be wrong ?

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  • HTTP Content-type header for cached files

    - by Brian
    Hello, Using Apache with mod_rewrite, when I load a .css or .js file and view the HTTP headers, the Content-type is only set correctly the first time I load it - subsequent refreshes are missing Content-type altogether and it's creating some problems for me. Specifically, gzip is not compressing these files. I can get around this by appending a random query string value to the end of each filename, eg. http://www.site.com/script.js?12345 However, I don't want to have to do that, since caching is good and all I want is for the Content-type to be present. I've tried using a RewriteRule to force the type but still didn't solve the problem. Any ideas? Thanks, Brian More Details: HTTP headers WITHOUT random query string value: http://localhost/script.js GET /script.js HTTP/1.1 Host: localhost User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 Accept: */* Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 115 Connection: keep-alive Referer: http://localhost/ Cookie: PHPSESSID=ke3p35v5qbus24che765p9jni5; If-Modified-Since: Thu, 29 Apr 2010 15:49:56 GMT If-None-Match: "3440e9-119ed-485621404f100" Cache-Control: max-age=0 HTTP/1.1 304 Not Modified Date: Thu, 29 Apr 2010 20:19:44 GMT Server: Apache/2.2.14 (Unix) mod_ssl/2.2.14 OpenSSL/0.9.8l DAV/2 PHP/5.3.1 Connection: Keep-Alive Keep-Alive: timeout=5, max=100 Etag: "3440e9-119ed-485621404f100" Vary: Accept-Encoding X-Pad: avoid browser bug HTTP headers WITH random query string value: http://localhost/script.js?c947344de8278053f6edbb4365550b25 GET /script.js?c947344de8278053f6edbb4365550b25 HTTP/1.1 Host: localhost User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 Accept: */* Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 115 Connection: keep-alive Referer: http://localhost/ Cookie: PHPSESSID=ke3p35v5qbus24che765p9jni5; HTTP/1.1 200 OK Date: Thu, 29 Apr 2010 20:14:40 GMT Server: Apache/2.2.14 (Unix) mod_ssl/2.2.14 OpenSSL/0.9.8l DAV/2 PHP/5.3.1 Last-Modified: Thu, 29 Apr 2010 15:49:56 GMT Etag: "3440e9-119ed-485621404f100" Accept-Ranges: bytes Vary: Accept-Encoding Content-Encoding: gzip Content-Length: 24605 Keep-Alive: timeout=5, max=100 Connection: Keep-Alive Content-Type: application/javascript

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  • Issue in extending webapplication sharepoint

    - by GHIYA
    I have extended a webapplication in a farm. main server vsmoss1 where i did vsmoss1 ->webapplication(80) vm.com -> extended web app(of above one)anonymous WFE server name vsmoss2 WFE server name vsmoss3 i have load balanced it to got to vsmoss2 and vsmoss3 when someone hits vm.com when i hit vm.com it works fine without authentication(shows content query webpart also on my page) I know there is no need to do that but when I hit vsmoss2 and vsmoss3 it shows me error on my content query webpart ....any solution for that? Finding this strange tried this : I closed both extended webapp in vsmoss2 and vsmoss3 result: site is up and running but this time with authentication I closed both extended and main webapplication site in vsmoss2 and vsmoss3 is down I closed main webapplication in vsmoss2 and vsmoss3 site is up and running without authentication Anyone is having idea why this is showing behaviour like this...?

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  • The requested resource is not available

    - by James Pj
    I have written a Java servlet program and run it through local Tomcat 7, But it was showing following error : HTTP Status 404 - /skypark/registration type Status report message /skypark/registration description The requested resource is not available. Apache Tomcat/7.0.33 I don't know what was the reason for it my Html page is <html> <head> <title> User registration </title> </head> <body> <form action="registration" method="post"> <center> <h2><b>Skypark User Registration</b></h2> <table border="0"> <tr><td> First Name </td><td> <input type="text" name="fname"/></br> </td></tr><tr><td> Last Name </td><td> <input type="text" name="lname"/></br> </td></tr><tr><td> UserName </td><td> <input type="text" name="uname"></br> </td></tr><tr><td> Enter Password </td><td> <input type="password" name="pass"></br> </td></tr><tr><td> Re-Type Password </td><td> <input type="password" name="pass1"></br> </td></tr><tr><td> Enter Email ID </td><td> <input type="email" name="email1"></br> </td></tr><tr><td> Phone Number </td><td> <input type="number" name="phone"> </td></tr><tr><td> Gender<br> </td></tr><tr><td> <input type="radio" name="gender" value="Male">Male</input></br> </td></tr><tr><td> <input type="radio" name="gender" value="Female">Female</input></br> </td></tr><tr><td> Enter Your Date of Birth<br> </td><td> <Table Border=0> <tr> <td> Date </td> <td>Month</td> <td>Year</td> </tr><tr> <td> <select name="date"> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5</option> . . . have some code . . . </table> <input type="submit" value="Submit"></br> </center> </form> </body> </html> My servlet is : package skypark; import skypark.*; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.sql.*; public class Registration extends HttpServlet { public static Connection prepareConnection()throws ClassNotFoundException,SQLException { String dcn="oracle.jdbc.driver.OracleDriver"; String url="jdbc:oracle:thin:@JamesPJ-PC:1521:skypark"; String usname="system"; String pass="tiger"; Class.forName(dcn); return DriverManager.getConnection(url,usname,pass); } public void doPost(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException { resp.setContentType("text/html"); PrintWriter out=resp.getWriter(); try { String phone1,uname,fname,lname,dob,address,city,state,country,pin,email,password,gender,lang,qual,relegion,privacy,hobbies,fav; uname=req.getParameter("uname"); fname=req.getParameter("fname"); lname=req.getParameter("lname"); dob=req.getParameter("date"); address=req.getParameter("address"); city=req.getParameter("city"); state=req.getParameter("state"); country=req.getParameter("country"); pin=req.getParameter("pin"); email=req.getParameter("email1"); password=req.getParameter("password"); gender=req.getParameter("gender"); phone1=req.getParameter("phone"); lang=""; qual=""; relegion=""; privacy=""; hobbies=""; fav=""; int phone=Integer.parseInt(phone1); Connection con=prepareConnection(); String Query="Insert into regdetails values(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)"; PreparedStatement ps=con.prepareStatement(Query); ps.setString(1,uname); ps.setString(2,fname); ps.setString(3,lname); ps.setString(4,dob); ps.setString(5,address); ps.setString(6,city); ps.setString(7,state); ps.setString(8,country); ps.setString(9,pin); ps.setString(10,lang); ps.setString(11,qual); ps.setString(12,relegion); ps.setString(13,privacy); ps.setString(14,hobbies); ps.setString(15,fav); ps.setString(16,gender); int c=ps.executeUpdate(); String query="insert into passmanager values(?,?,?,?)"; PreparedStatement ps1=con.prepareStatement(query); ps1.setString(1,uname); ps1.setString(2,password); ps1.setString(3,email); ps1.setInt(4,phone); int i=ps1.executeUpdate(); if(c==1||c==Statement.SUCCESS_NO_INFO && i==1||i==Statement.SUCCESS_NO_INFO) { out.println("<html><head><title>Login</title></head><body>"); out.println("<center><h2>Skypark.com</h2>"); out.println("<table border=0><tr>"); out.println("<td>UserName/E-Mail</td>"); out.println("<form action=login method=post"); out.println("<td><input type=text name=uname></td>"); out.println("</tr><tr><td>Password</td>"); out.println("<td><input type=password name=pass></td></tr></table>"); out.println("<input type=submit value=Login>"); out.println("</form></body></html>"); } else { out.println("<html><head><title>Error!</title></head><body>"); out.println("<center><b>Given details are incorrect</b>"); out.println(" Please try again</center></body></html>"); RequestDispatcher rd=req.getRequestDispatcher("registration.html"); rd.include(req,resp); return; } } catch(Exception e) { out.println("<html><head><title>Error!</title><body>"); out.println("<b><i>Unable to process try after some time</i></b>"); out.println("</body></html>"); RequestDispatcher rd=req.getRequestDispatcher("registration.html"); rd.include(req,resp); return; } out.flush(); out.close(); } } And the web.xml file is <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0" metadata-complete="true"> <servlet> <servlet-name>reg</servlet-name> <servlet-class>skypark.Registration</servlet-class> </servlet> <servlet-mapping> <servlet-name>reg</servlet-name> <url-pattern>/registration</url-pattern> </servlet-mapping> This i kept in C:\Program Files\Apache Software Foundation\Tomcat 7.0\webapps\skypark\WEB_INF\web.xml and servlet class in C:\Program Files\Apache Software Foundation\Tomcat 7.0\webapps\skypark\WEB_INF\classes\skypark and registration.html in C:\Program Files\Apache Software Foundation\Tomcat 7.0\webapps\skypark\ if any mistake in this makes above error means please help me.Thanks in advance....

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  • Erratic DNS name resolution

    - by alex
    Hi all, We have a client we host a web for (blog.foobar.es). We do not manage foobar.es's DNS setup, we just told them to point blog.foobar.es to our web server's IP. We have noticed that sometimes we cannot browse to blog.foobar.es, but we can browse to other sites on that server. Troubleshooting a bit using host(1) yields something funny: $ host blog.foobar.es 8.8.8.8 Using domain server: Name: 8.8.8.8 Address: 8.8.8.8#53 Aliases: Host blog.foobar.es not found: 3(NXDOMAIN) , being 8.8.8.8 one of Google's public DNS servers. However, sometimes the same server resolves the name correctly (!). Another funny thing, is that our ISP's DNS servers sometimes say: $ host blog.foobar.es 80.58.61.250 Using domain server: Name: 80.58.61.250 Address: 80.58.61.250#53 Aliases: blog.foobar.es has address x.x.x.x Host blog.foobar.es not found: 3(NXDOMAIN) Which I don't really understand. I've dug around using dig(1), and have noticed they've set up a SOA record for foobar.es: $ dig foobar.es ; <<>> DiG 9.7.0-P1 <<>> foobar.es ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59824 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;foobar.es. IN A ;; AUTHORITY SECTION: foobar.es. 86400 IN SOA dns1.provider.es. root.dns1.provider.es. 2011030301 86400 7200 2592000 172800 ;; Query time: 78 msec ;; SERVER: 80.58.61.250#53(80.58.61.250) ;; WHEN: Thu Mar 3 16:16:19 2011 ;; MSG SIZE rcvd: 78 ... which I'm completely unfamiliar with. Ideas? We can't really do much as we do not control DNS, but we'd like to point our clients in the right direction...

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  • The Exceptional EXCEPT clause

    - by steveh99999
    Ok, I exaggerate, but it can be useful… I came across some ‘poorly-written’ stored procedures on a SQL server recently, that were using sp_xml_preparedocument. Unfortunately these procs were  not properly removing the memory allocated to XML structures – ie they were not subsequently calling sp_xml_removedocument… I needed a quick way of identifying on the server how many stored procedures this affected.. Here’s what I used.. EXEC sp_msforeachdb 'USE ? SELECT DB_NAME(),OBJECT_NAME(s1.id) FROM syscomments s1 WHERE [text] LIKE ''%sp_xml_preparedocument%'' EXCEPT SELECT DB_NAME(),OBJECT_NAME(s2.id) FROM syscomments s2 WHERE [text] LIKE ''%sp_xml_removedocument%'' ‘ There’s three nice features about the code above… 1. It uses sp_msforeachdb. There’s a nice blog on this statement here 2. It uses the EXCEPT clause.  So in the above query I get all the procedures which include the sp_xml_preparedocument string, but by using the EXCEPT clause I remove all the procedures which contain sp_xml_removedocument.  Read more about EXCEPT here 3. It can be used to quickly identify incorrect usage of sp_xml_preparedocument. Read more about this here The above query isn’t perfect – I’m not properly parsing the SQL text to ignore comments for example - but for the quick analysis I needed to perform, it was just the job…

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  • Tie stock quote value to cell in Excel 2011 Mac

    - by vedantchandra
    I've been working on a mock stock portfolio in Excel, and I've been looking for ways to automatically update the data, eg. stock price and P/E ratio. I have tried using a web query to MSN Money, but that just brings up the whole stock quote across multiple cells, I want data to be updated in individual cells only. The only web query solution I can think of is if someone hosted a website where each value in the stock quote was saved on a different HTML file. I could then WebQuery to that file for each cell requiring that value. However, no website offers this. So in essence, is there any tool on Excel 2011 Mac that will let me pull individual values from a stock quote and assign them to a single cell?

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  • SQL Server Date Comparison Functions

    - by HighAltitudeCoder
    A few months ago, I found myself working with a repetitive cursor that looped until the data had been manipulated enough times that it was finally correct.  The cursor was heavily dependent upon dates, every time requiring the earlier of two (or several) dates in one stored procedure, while requiring the later of two dates in another stored procedure. In short what I needed was a function that would allow me to perform the following evaluation: WHERE MAX(Date1, Date2) < @SomeDate The problem is, the MAX() function in SQL Server does not perform this functionality.  So, I set out to put these functions together.  They are titled: EarlierOf() and LaterOf(). /**********************************************************                               EarlierOf.sql   **********************************************************/ /**********************************************************   Return the later of two DATETIME variables.   Parameter 1: DATETIME1 Parameter 2: DATETIME2   Works for a variety of DATETIME or NULL values. Even though comparisons with NULL are actually indeterminate, we know conceptually that NULL is not earlier or later than any other date provided.   SYNTAX: SELECT dbo.EarlierOf('1/1/2000','12/1/2009') SELECT dbo.EarlierOf('2009-12-01 00:00:00.000','2009-12-01 00:00:00.521') SELECT dbo.EarlierOf('11/15/2000',NULL) SELECT dbo.EarlierOf(NULL,'1/15/2004') SELECT dbo.EarlierOf(NULL,NULL)   **********************************************************/ USE AdventureWorks GO   IF EXISTS       (SELECT *       FROM sysobjects       WHERE name = 'EarlierOf'       AND xtype = 'FN'       ) BEGIN             DROP FUNCTION EarlierOf END GO   CREATE FUNCTION EarlierOf (       @Date1                              DATETIME,       @Date2                              DATETIME )   RETURNS DATETIME   AS BEGIN       DECLARE @ReturnDate     DATETIME         IF (@Date1 IS NULL AND @Date2 IS NULL)       BEGIN             SET @ReturnDate = NULL             GOTO EndOfFunction       END         ELSE IF (@Date1 IS NULL AND @Date2 IS NOT NULL)       BEGIN             SET @ReturnDate = @Date2             GOTO EndOfFunction       END         ELSE IF (@Date1 IS NOT NULL AND @Date2 IS NULL)       BEGIN             SET @ReturnDate = @Date1             GOTO EndOfFunction       END         ELSE       BEGIN             SET @ReturnDate = @Date1             IF @Date2 < @Date1                   SET @ReturnDate = @Date2             GOTO EndOfFunction       END         EndOfFunction:       RETURN @ReturnDate   END -- End Function GO   ---- Set Permissions --GRANT SELECT ON EarlierOf TO UserRole1 --GRANT SELECT ON EarlierOf TO UserRole2 --GO                                                                                             The inverse of this function is only slightly different. /**********************************************************                               LaterOf.sql   **********************************************************/ /**********************************************************   Return the later of two DATETIME variables.   Parameter 1: DATETIME1 Parameter 2: DATETIME2   Works for a variety of DATETIME or NULL values. Even though comparisons with NULL are actually indeterminate, we know conceptually that NULL is not earlier or later than any other date provided.   SYNTAX: SELECT dbo.LaterOf('1/1/2000','12/1/2009') SELECT dbo.LaterOf('2009-12-01 00:00:00.000','2009-12-01 00:00:00.521') SELECT dbo.LaterOf('11/15/2000',NULL) SELECT dbo.LaterOf(NULL,'1/15/2004') SELECT dbo.LaterOf(NULL,NULL)   **********************************************************/ USE AdventureWorks GO   IF EXISTS       (SELECT *       FROM sysobjects       WHERE name = 'LaterOf'       AND xtype = 'FN'       ) BEGIN             DROP FUNCTION LaterOf END GO   CREATE FUNCTION LaterOf (       @Date1                              DATETIME,       @Date2                              DATETIME )   RETURNS DATETIME   AS BEGIN       DECLARE @ReturnDate     DATETIME         IF (@Date1 IS NULL AND @Date2 IS NULL)       BEGIN             SET @ReturnDate = NULL             GOTO EndOfFunction       END         ELSE IF (@Date1 IS NULL AND @Date2 IS NOT NULL)       BEGIN             SET @ReturnDate = @Date2             GOTO EndOfFunction       END         ELSE IF (@Date1 IS NOT NULL AND @Date2 IS NULL)       BEGIN             SET @ReturnDate = @Date1             GOTO EndOfFunction       END         ELSE       BEGIN             SET @ReturnDate = @Date1             IF @Date2 > @Date1                   SET @ReturnDate = @Date2             GOTO EndOfFunction       END         EndOfFunction:       RETURN @ReturnDate   END -- End Function GO   ---- Set Permissions --GRANT SELECT ON LaterOf TO UserRole1 --GRANT SELECT ON LaterOf TO UserRole2 --GO                                                                                             The interesting thing about this function is its simplicity and the built-in NULL handling functionality.  Its interesting, because it seems like something should already exist in SQL Server that does this.  From a different vantage point, if you create this functionality and it is easy to use (ideally, intuitively self-explanatory), you have made a successful contribution. Interesting is good.  Self-explanatory, or intuitive is FAR better.  Happy coding! Graeme

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  • Entity Component System for HUD and GUI

    - by Jason L.
    This is a very rough sketch of how I currently have things designed. It should, at least, give an idea of how my ECS is currently designed. If you notice in that diagram, I have basically split the HUD out of the ECS. They have their own set of things (HudLayer, HudComponent, etc) and are handled differently. This is where I'm struggling, though. There are many different instances in which the HUD will need to know about entities. Not just data changing (I have an event dispatcher for that), but the actual entity and all it encompasses. There are also situations where entities will need to be able to query the HUD for data. Let's take a couple examples: First, my equipment screen. On here I can change the equipment on a character (Entity). In order for this to happen, I need to know about the entity. At least I think I do? How can I handle this? The second scenario involves my Systems needing to query a HudComponent for data. A specific example would be my battle system. Each "team" is given a 3x3 grid they can move around in. See here: Skills target these cells, and not the player, so I would need a way for my systems to determine which cells are occupied and which are not. Basically I need a way for two way communication between Systems and my HUD. I know it's recommended (by some people, anyways) to take your HUD out of the ECS. Is that appropriate in my case?

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  • Three Buckets of Knowledge

    - by BuckWoody
    As I learn more and more about SQL Server every day, I divide up my information into three “buckets”: Concepts In the first bucket are the general concepts about the topic. What is it? What does it do (or sometimes, what is is supposed to do?) How does one operation flow to another? For this information I use books, magazine articles and believe it or not – Wikipedia. I don’t always trust that last source, but I do use it to see how others lay out their thoughts around a concept. I really like graphical charts that show me the process flow if I can get it, and this is an ideal place for a good presentation. In fact, this may be the only real use for a presentation – I’ll explain what I mean in a moment. Reference The references for a topic include things like Transact-SQL (T-SQL) syntax, or the screen layout on a panel, things like that. Think Dictionary. The only reference I trust for this information is Books Online – presentations are fine, but we’re talking about a dictionary. Ever go to a movie that just reads through a dictionary? Me neither. But I have gone to presentations where people try to include tons of reference materials in their slides. Even if you give me the presentation material later, it’s not really a searchable, readable medium. How To A how-to for me is an example, or even better, a tutorial about an example. Whatever it is shows me a practical use for the concepts and of course involves the syntax. The important thing here is that you need to be able to separate out the example the person is showing you from the stuff you need to know. I can’t tell you how many times folks have told me, “well, sure, if yours is red then that works. But mine is blue.” And I have to explain, “then use “blue” for the search word here.” You get the idea. No one will do your work for you – the examples are meant as a teaching tool only. I accept that, learn what I can, and then run off to create my own thing. You might think a How To works well in a presentation, and it does, for the most part. For a complex example or tutorial, I still prefer the printed word (electronic if possible) so that I can go over the example multiple times, skip around and so on.   The order here isn’t actually that important. Most of the time I start with a concept, look at an example, and then read the reference material. But sometimes I look up an example, read a little of concepts and then check the reference. The only primary thing I try to enforce is to read something from each of them. It’s dangerous to base your work on any single example, reference or concept.  Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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