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• What's the proper way to use sqlite on the iPhone?

  - by Elliot Chen

  Hi, Experts: Can you please give some suggestions on sqlite using on the iPhone? Within my application, I use a sqlite DB to store all local data. Two methods can be used to retrieve those data during running time. 1, Load all the data into memory at initialization stage. (More memory used, less DB open/close operation needed) 2, Read corresponding records when necessary, free the occupied memory after using. (Good habit for memory using, but much DB open/close operations needs). I prefer to use method 2, but not sure whether too many DB opening/closing operations could affect app's efficiency. Or do you think I can 'upgrade' method 2 by opening DB when app launches and closing DB when app quits? Thanks for your suggestions very much!

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• What's the proper way to use sqlite at xCode?

  - by Elliot Chen

  Hi, Experts: Can you please give some suggestions on sqlite using at xcode? Within my application, I use a sqlite DB to store all local data. Two methods can be used to retrieve those data during running time. 1, Load all the data into memory at initialization stage. (More memory used, less DB open/close operation needed) 2, Read corresponding records when necessary, free the occupied memory after using. (Good habit for memory using, but much DB open/close operations needs). I prefer to use method 2, but not sure whether too many DB opening/closing operations could affect app's efficiency. Or do you think I can 'upgrade' method 2 by opening DB when app launches and closing DB when app quits? Thanks for your suggestions very much!

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• sqlite use in tcl script over nfs (or.. how to make standalone sqlite3 which can be run over nfs)

  - by wom

  Hello. I want to use an embed an sqlite database into an existing tcl application (Migrate from flat-file). Currently; our tcl interpreter is run from a network location; /bin/tclsh8.3 I do have an nfs $PATH for executables set for all users already; I am assuming I can place a standalone sqlite3 executible there; though I have been not found an easy way to compile a local lib independent sqlite yet... (all linux clients, running anything from red hat 9 to ubuntu 10.04) Anyone able to poke me in the right direction in building an sqlite3 standalone binary I can use in my nfs tcl install? Thanks, Chris

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• How can I load a SQLITE database from a buffer with the C API ?

  - by rockeye

  Hello, I am trying to load a database from the memory instead of opening a .sqlite file. I have read the C/C++ API reference but I can not find the proper method. The buffer I am trying to load is simply an sqlite file loaded in memory. I just want to use this buffer (a const char* array) without using the filesystem (I could have saved this buffer in a file, then load the file, but no). First, I create a memory DB : mErrorCode = sqlite3_open_v2(":memory:", &mSqlDatabase, lMode, NULL); This returns SQLITE_OK, then I tried to use the buffer as a statement and call preparev2(MyDB, MyBufferData, MyBufferLength, MyStatement, NULL) but it's not really a statement, and it returns an error. Same result if I call directly exec(MyDB, MyBufferData, NULL, NULL, NULL); I guess there is an appropriate method to achieve this as it might be common to load a DB from a stream or from decrypted data... Thanks.

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• How to build custom sqlite with provider under Android?

  - by dr4cul4

  Hi, I have a really strange problem. I need to build custom sqlite3 database engine under Android OS, but I also want to use database provider implementation. Unfortunately when examining sources of Android 1.6 I noticed that it's not so easy. Many classes including android.database.; packages use original provider, also many other parts of framework use android.database.sqlite.; packages directly, wich ofcourse make this abstraction a bit confusing and unnesesary. But going to my question. If there is any way that I could extend database interfaces to use custom implmentation of sqlite (or any other database)?

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• How can I store and access SQLite databases from a central location?

  - by Brian Ramsay

  I have installed SQLite on my UNIX system, and am planning on accessing it from PHP. However, the database is created in the directory I initialize it in, and if a script runs in a different directory a new database is created in the same directory. Is there an option for SQLite (or the PHP wrappers) to create the databases in one location, and have those databases accessible just by name outside of that directory? Ideally, I'd like to be able to do something like $db=new SQLiteDatabase("db.test"); in any directory and have it reference the same database, if that makes sense.

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• how to query sqlite for certain rows, i.e. dividing it into pages (perl DBI)

  - by user1380641

  sorry for my noob question, I'm currently writing a perl web application with sqlite database behind it. I would like to be able to show in my app query results which might get thousands of rows - these should be split in pages - routing should be like /webapp/N - where N is the page number. what is the correct way to query the sqlite db using DBI, in order to fetch only the relavent rows. for instance, if I show 25 rows per page so I want to query the db for 1-25 rows in the first page, 26-50 in the second page etc.... Thanks in advanced!

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• Extension Methods in Dot Net 2.0

  - by Tom Hines

  Not that anyone would still need this, but in case you have a situation where the code MUST be .NET 2.0 compliant and you want to use a cool feature like Extension methods, there is a way.  I saw this article when looking for ways to create extension methods in C++, C# and VB:  http://msdn.microsoft.com/en-us/magazine/cc163317.aspx The author shows a simple  way to declare/define the ExtensionAttribute so it's available to 2.0 .NET code. Please read the article to learn about the when and why and use the content below to learn HOW. In the next post, I'll demonstrate cross-language calling of extension methods. Here is a version of it in C# First, here's the project showing there's no VOODOO included: using System; namespace System.Runtime.CompilerServices {    [       AttributeUsage(          AttributeTargets.Assembly          | AttributeTargets.Class          | AttributeTargets.Method,       AllowMultiple = false, Inherited = false)    ]    class ExtensionAttribute : Attribute{} } namespace TestTwoDotExtensions {    public static class Program    {       public static void DoThingCS(this string str)       {          Console.WriteLine("2.0\t{0:G}\t2.0", str);       }       static void Main(string[] args)       {          "asdf".DoThingCS();       }    } }   Here is the C++ version: // TestTwoDotExtensions_CPP.h #pragma once using namespace System; namespace System {        namespace Runtime {               namespace CompilerServices {               [                      AttributeUsage(                            AttributeTargets::Assembly                             | AttributeTargets::Class                            | AttributeTargets::Method,                      AllowMultiple = false, Inherited = false)               ]               public ref class ExtensionAttribute : Attribute{};               }        } } using namespace System::Runtime::CompilerServices; namespace TestTwoDotExtensions_CPP { public ref class CTestTwoDotExtensions_CPP {    public:            [ExtensionAttribute] // or [Extension]            static void DoThingCPP(String^ str)    {       Console::WriteLine("2.0\t{0:G}\t2.0", str);    } }; }

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• Web Essentials extension now available for Visual Studio Express

  - by ihaynes

  Originally posted on: http://geekswithblogs.net/ihaynes/archive/2014/08/12/web-essentials-extension-now-available-for-visual-studio-express.aspxVisual Studio Express has always had one big issue for me, the inability to install any (or very few) of the normal Visual Studio extensions. One of the best extensions for front-end development and design is the Web Essentials extension by Mads Kristensen on the VS team. It was a hugely welcome surprise to find that this extension is now available, in full, for VS Express, and had been since May, darn it! It has a huge number of useful features, not least being able to minify HTML, CSS and JavaScript files, which is almost a prerequisite for responsive sites. It can also bundle them together. There are lots of other features for HTML editing; intellisense and syntax highlighting for robots.txt files; 'surround with tag', intellisense for meta tags (including iOS, Twitter and Facebook); generate vendor-specific CSS etc etc. The full details can be found at the dedicated site. http://vswebessentials.com This extension alone makes VS Express far more useful and worth having.

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• Stream.CopyTo() extension method

  - by DigiMortal

  In one of my applications I needed copy data from one stream to another. After playing with streams a little bit I wrote CopyTo() extension method to Stream class you can use to copy the contents of current stream to target stream. Here is my extension method. It is my working draft and it is possible that there must be some more checks before we can say this extension method is ready to be part of some API or class library. public static void CopyTo(this Stream fromStream, Stream toStream) {     if (fromStream == null)         throw new ArgumentNullException("fromStream");     if (toStream == null)         throw new ArgumentNullException("toStream");       var bytes = new byte[8092];     int dataRead;     while ((dataRead = fromStream.Read(bytes, 0, bytes.Length)) > 0)         toStream.Write(bytes, 0, dataRead); } And here is example how to use this extension method. using(var stream = response.GetResponseStream()) using(var ms = new MemoryStream()) {     stream.CopyTo(ms);       // Do something with copied data } I am using this code to copy data from HTTP response stream to memory stream because I have to use serializer that needs more than response stream is able to offer.

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• New Visual Studio 2010 Extension - Collapse Solution

  - by MikeParks

  If your team has recently upgraded to Visual Studio 2010, take a second to check out the new Extension Manager. You can use it to browse through or install tons of tools, controls, or templates from the Visual Studio Gallery. My friend, Cory Cissell, and I recently teamed up and created an extension of our own called "Collapse Solution". It adds an option called Collapse Solution to the context menu of the solution node in the solution explorer. It also adds an option called Collapse Project to the context menu of each project node in the solution explorer. When that option is clicked, it will walk through the solution explorer tree and collapse any expanded child nodes in that section (projects, folders, code behind files, designer files, etc.). I use to have an add-in that did this in Visual Studio 2008 but it wasn't compatible when we upgraded to 2010 so we decided to write our own. The old tool was also packaged with a bunch of other junk that we didn't need so we figured it would be a much cleaner tool if it was broken off into its own extension. There's no need to install extra tools if you don't really need them. So if you have upgraded to Visual Studio 2010, please feel free to try out our Collapse Solution extension and leave us a rating/review in the Visual Studio Gallery. Thanks! Here's the link: http://visualstudiogallery.msdn.microsoft.com/en-us/2d81fec6-71f3-4fa5-87b4-c2aa18e42f92

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• GlassFish Extension for Oracle JDeveloper

  - by Shay Shmeltzer

  We just release a new version of Oracle JDeveloper - 11.1.2.3. One new feature here is built-in support for GlassFish. This include the ability to create an "application server" connection to GlassFish and then deploy to that server with one click from inside JDeveloper. You can use this for deploying Oracle ADF Essentials application on Glassfish, but you can also use it to deploy any Java EE application you build in JDeveloper on GlassFish. However, if you are planning to work with GlassFish and JDeveloper on a more regular basis as your development server, then you might find my new extension useful. The new extension allows you to start and stop an external GlassFish instance, as well as start it in debug mode (which will allow JDeveloper to remotely debug your application as it runs on the server. I also added a button that will invoke the web admin console of Glassfish. Here is a quick demo that will show you how to work with the extension: The extension is available from help->check for updates, or you can download it directly from here, and then use help->check for updates pointing to the local zip file.

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• Cannot install gnome shell extensions

  - by gnome

  I upgrade from 10.04 to 12.04, install gnome 3 and remove unity. My gnome version is 3.4.1. The GNOME Shell extensions is installed and enabled. When I use firefox to visit each extension page in https://extensions.gnome.org/, for example, https://extensions.gnome.org/extension/5/alternative-status-menu/, there is no where to install the extensions. I am told that one can install extensions by visite these extension pages. This is the guide I followed.

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• Problem with sqlite database on android platform

  - by mudit

  hi all i am developing an application which uses sqlite db for storing records. I am developing this application on SDK 1.5.. when i test the application on 1.5 device it works good but when i try to run it on a 1.6 device i get a force close message with following logcat output: 03-19 09:31:35.206: ERROR/AndroidRuntime(224): Uncaught handler: thread main exiting due to uncaught exception 03-19 09:31:35.226: ERROR/AndroidRuntime(224): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.abc.android/com.abc.android.app}: android.database.sqlite.SQLiteException: unable to open database file 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2454) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2470) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.app.ActivityThread.access$2200(ActivityThread.java:119) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.os.Handler.dispatchMessage(Handler.java:99) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.os.Looper.loop(Looper.java:123) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.app.ActivityThread.main(ActivityThread.java:4310) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at java.lang.reflect.Method.invokeNative(Native Method) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at java.lang.reflect.Method.invoke(Method.java:521) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at dalvik.system.NativeStart.main(Native Method) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): Caused by: android.database.sqlite.SQLiteException: unable to open database file 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.database.sqlite.SQLiteDatabase.dbopen(Native Method) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.database.sqlite.SQLiteDatabase.(SQLiteDatabase.java:1697) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:738) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:760) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:753) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.app.ApplicationContext.openOrCreateDatabase(ApplicationContext.java:473) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:193) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:98) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at com.abc.android.DbAdapter.open(DbAdapter.java:101) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at com.abc.android.class1.onCreate(class1.java:105) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2417) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): ... 11 more DBAdapter.java public DbAdapter open() throws SQLException { Log.d("DbAdapter", "in DbAdapter open()"); mDbHelper = new DatabaseHelper(mCtx); mDb = mDbHelper.getWritableDatabase(); // line 101 return this; } DatabaseHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL(DATABASE_QUERY); } class1.java mDB = new DbAdapter(Class1.this); mDB.open(); // line 105 Please help..what do i do????

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• Cross-Browser Extension Installation now Possible with Opera and Google Chrome

  - by Akemi Iwaya

  People have been curious if there would be cross-browser compatibility for extensions due to Opera’s recent switch to the browser engine that Google Chrome uses. That question has now been answered. The OMG! Chrome! Blog has put together a nice tutorial on how to get cross-browser extension compatibility set up and working with your browser of choice. Screenshot courtesy of OMG! Chrome! Blog. While it is not surprising that the first steps in cross-browser extension compatibility have been taken, it will be interesting to see how it develops as the process is refined and further development occurs with the ‘new’ Opera. What are your thoughts on this? Is cross-browser extension compatibility really that important? Perhaps you feel that it does not matter? Let us know your thoughts in the comments!    

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• How to use Mercurial's LargeFiles extension? [migrated]

  - by DuncanBoehle

  I use Mercurial for game development, and I'm trying to use the LargeFiles extension included in Mercurial 2.0 to keep track of large binary assets. Unfortunately there isn't a whole lot of documentation on the extension, so I'm not sure how people are expected to use it. For example, is there any way to safely clean out the .hg/largefiles directory? If I'm on the tip revision, and expect to always have internet access, then I don't need the old versions of largefiles cluttering up the repository, since that's the whole point of using the LargeFiles extension. Also, how do I have more fine-grained control over where the largefile store is? I can only assume that it's created somewhere on the computer that ran hg init, but I have no idea about the details. Thanks!

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• Extension Manager in Visual Studio 2010

  One of the powerful aspect of Visual Studio is its ability to be extended and many people do that. You can find numerous extensions at the Visual Studio Gallery. The VSX team links to a 4-part blog series on how to create and share templates. You can also look find extension examples on the vsx code gallery.With Visual Studio 2010, you can search for items and install them directly from within Visual Studio's new Extension Manager. You launch it from the Tools menu:When the dialog comes up, be sure to explore the various actionable areas on the left and also note the search on the right. For example, I typed "MP" and it quickly filtered the list to show me the MPI Project Template:Others have written about this before me, just bing Extension Manager (and note that Beta2 introduced changes, some of which you can witness in the screenshot above). Comments about this post welcome at the original blog.

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• Preview YouTube Videos On Mouse Over–Chrome Extension

  - by Gopinath

  YouTube video preview is a nice Google Chrome extension that let you preview YouTube videos without playing them. After installing the plugin, users can hover mouse on any of the YouTube video thumbnails displayed on YouTube website to preview the video. This plugin tries to imitate the beautiful Bing Video search results preview feature by displaying 3 frames of video. The plugin does not work outside YouTube website. May be you can give a try to this plugin.  Download YouTube Video Preview Extension This article titled,Preview YouTube Videos On Mouse Over–Chrome Extension, was originally published at Tech Dreams. Grab our rss feed or fan us on Facebook to get updates from us.

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• Extension Manager in Visual Studio 2010

  One of the powerful aspect of Visual Studio is its ability to be extended and many people do that. You can find numerous extensions at the Visual Studio Gallery. The VSX team links to a 4-part blog series on how to create and share templates. You can also look find extension examples on the vsx code gallery.With Visual Studio 2010, you can search for items and install them directly from within Visual Studio's new Extension Manager. You launch it from the Tools menu:When the dialog comes up, be sure to explore the various actionable areas on the left and also note the search on the right. For example, I typed "MP" and it quickly filtered the list to show me the MPI Project Template:Others have written about this before me, just bing Extension Manager (and note that Beta2 introduced changes, some of which you can witness in the screenshot above). Comments about this post welcome at the original blog.

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• Une extension pour bloquer Google Analytics signée Google fonctionne avec Chrome, Firefox et Interne

  Une extension pour bloquer Google Analytics Signée Google fonctionne avec Chrome, Firefox et Internet Explorer : initiative sincère ou marketing ? Qui l'eut cru ? Google a imaginé une extension qui permet de bloquer Google Analytics, un de ses services d'analyse d'audiences proposés aux webmestres. Google Analytics se présente sous la forme d'un code JavaScript à insérer dans une page web et permet de collecter des informations sur les visiteurs? notamment sur la manière dont ils sont arrivés sur le site. Baptisée Analytics Opt-out Browser Add-on, l'extension permet de ne pas envoyer ces informations au propriétaire du site ? ni a priori à Goog...

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• Spaces in type attribute for Behavior Extension Configuration Issues

  - by Shawn Cicoria

  If you’ve deployed your WCF Behavior Extension, and you get a Configuration Error, it might just be you’re lacking a space between your “Type” name and the “Assembly” name. You'll get the following error message: Verify that the extension is registered in the extension collection at system.serviceModel/extensions/behaviorExtensions So, if you’ve entered as below without <system.serviceModel> <extensions> <behaviorExtensions> <add name="appFabricE2E" type="Fabrikam.Services.AppFabricE2EBehaviorElement,Fabrikam.Services, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"/> </behaviorExtensions> </extensions> The following will work – notice the additional space between the Type name and the Assembly name: <system.serviceModel> <extensions> <behaviorExtensions> <add name="appFabricE2E" type="Fabrikam.Services.AppFabricE2EBehaviorElement,Fabrikam.Services, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"/> </behaviorExtensions> </extensions>

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• Visual Studio 2010: Extension Manager

  - by Natasa Gavrilovic

  If you still didn’t explore Extension Manager under Tools in Visual Studio 2010 now it’s the time!   VS2010 can be expended to include add-ons you wish to have. The Extension Manager list is pretty extensive, where most of them are ‘still work in progress’ tools but, at least, it is worth trying.   Listed below are top ranked ones that should help to enhance your coding experience:   ·         Productivity Power Tools – set of small gadgets: Auto Brace Completion, Quick Access, Column Guides, Align Assignments, Triple Click etc. ·         PowerCommands  ·         Visual Studio Web Standards Update –newly released update for support HTML5 and CSS3 ·         MVC Scaffolding - scaffold elements from entities ·         NuGet Package Manager – automated package manager tool   Online the Extension manager is locaated ats Visual Studio Gallery.   Another good place is CodePlex. It is open source software website focusing on .NET that contains more than 20 000 add-ons tagged in more than 20 different categories.   Feel free to add a comment how your VS is ‘customized’ and what will be your recommendation.   N.

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• How do I insert and query a DateTime object in SQLite DB from C# ?

  - by Soham

  Hi All, Consider this snippet of code: string sDate = string.Format("{0:u}", this.Date); Conn.Open(); Command.CommandText = "INSERT INTO TRADES VALUES(" + "\"" + this.Date + "\"" + "," +this.ATR + "," + "\"" + this.BIAS + "\"" + ")"; Command.ExecuteNonQuery(); Note the "this.Date" part of the command. Now Date is an abject of type DateTime of C# environment, the DB doesnt store it(somewhere in SQLite forum, it was written that ADO.NET wrapper automatically converts DateTime type to ISO1806 format) But instead of this.Date when I use sDate (shown in the first line) then it stores properly. My probem actually doesnt end here. Even if I use "sDate", I have to retrieve it through a query. And that is creating the problem Any query of this format SELECT * FROM <Table_Name> WHERE DATES = "YYYY-MM-DD" returns nothing, whereas replacing '=' with '' or '<' returns right results. So my point is: How do I query for Date variables from SQLite Database. And if there is a problem with the way I stored it (i.e non 1806 compliant), then how do I make it compliant

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• How to read LARGE Sqlite file to be copied into Android emulator, or device from assets folder?

  - by Peter SHINe ???

  I guess many people already read this article: Using your own SQLite database in Android applications: http://www.reigndesign.com/blog/using-your-own-sqlite-database-in-android-applications/comment-page-2/#comment-12368 However it's keep bringing IOException at while ((length = myInput.read(buffer))>0){ myOutput.write(buffer, 0, length); } I’am trying to use a large DB file. It’s as big as 8MB I built it using sqlite3 in Mac OS X, inserted UTF-8 encoded strings (for I am using Korean), added android_meta table with ko_KR as locale, as instructed above. However, When I debug, it keeps showing IOException at length=myInput.read(buffer) I suspect it’s caused by trying to read a big file. If not, I have no clue why. I tested the same code using much smaller text file, and it worked fine. Can anyone help me out on this? I’ve searched many places, but no place gave me the clear answer, or good solution. Good meaning efficient or easy. I will try use BufferedInput(Output)Stream, but if the simpler one cannot work, I don’t think this will work either. Can anyone explain the fundamental limits in file input/output in Android, and the right way around it, possibly? I will really appreciate anyone’s considerate answer. Thank you. WITH MORE DETAIL: private void copyDataBase() throws IOException{ //Open your local db as the input stream InputStream myInput = myContext.getAssets().open(DB_NAME); // Path to the just created empty db String outFileName = DB_PATH + DB_NAME; //Open the empty db as the output stream OutputStream myOutput = new FileOutputStream(outFileName); //transfer bytes from the inputfile to the outputfile byte[] buffer = new byte[1024]; int length; while ((length = myInput.read(buffer))>0){ myOutput.write(buffer, 0, length); } //Close the streams myOutput.flush(); myOutput.close(); myInput.close(); }

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• Using an embedded DB (SQLite / SQL Compact) for Message Passing within an app?

  - by wk1989

  Hello, Just out of curiosity, for applications that have a fairly complicated module tree, would something like sqlite/sql compact edition work well for message passing? So if I have modules containing data such as: \SubsystemA\SubSubSysB\ModuleB\ModuleDataC, \SubSystemB\SubSubSystemC\ModuleA\ModuleDataX Using traditional message passing/routing, you have to go through intermediate modules in order to pass a message to ModuleB to request say ModuleDataC. Instead of doing that, if we we simply store "\SubsystemA\SubSubSysB\ModuleB\ModuleDataC" in a sqlite database, getting that data is as simple as a sql query and needs no routing and passing stuff around. Has anyone done this before? Even if you haven't, do you foresee any issues & performance impact? The only concern I have right now would be the passing of custom types, e.g. if ModuleDataC is a custom data structure or a pointer, I'll need some way of storing the data structure into the DB or storing the pointer into the DB. Thanks, JW EDIT One usage case I haven't thought about is when you want to send a message from ModuleA to ModuleB to get ModuleB to do something rather than just getting/setting data. Is it possible to do this using an embedded DB? I believe callback from the DB would be needed, how feasible is this?

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