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  • How to prevent column b containing the same value as any column a in Oracle?

    - by Janek Bogucki
    What is a good way to prevent a table with 2 columns, a and b, from having any record where column b is equal to any value in column a? This would be used for a table of corrections like this, MR -> Mr Prf. -> Prof. MRs -> Mrs I can see how it could be done with a trigger and a subquery assuming no concurrent activity but a more declarative approach would be preferable. This is an example of what should be prevented, Wing Commdr. -> Wing Cdr. Wing Cdr. -> Wing Commander Ideally the solution would work with concurrent inserts and updates.

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  • Qt: Writing plugins for other applications

    - by Rasmus Faber
    I am writing a plugin for another application. I want to support the plugin on multiple platforms, so I am strongly considering using Qt. The plugin needs to be able to show some basic GUI. The plugin interface does not in any way handle GUI - it is just a simple DLL/shared library specified with a C-header file. Can I use Qt inside such a shared library? The calling application might or might not be using Qt itself. Any hints on what to do? Do I need to run a QApplication event-loop in a separate thread? Or can I just call the event-loop myself while waiting for input? (I only need modal dialogs).

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  • Using Ogg Vorbis in Flash/Flex applications

    - by Aravindan
    I am looking to use ogg vorbis, instead of mp3s to stream audio. It seems that Flash player does not natively support ogg. Is there a codec engine that can be embedded with the app itself that can play .ogg instead of .mp3? In general, what would be a better format than mp3 for streaming audio and that is supported by Flash?

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  • Oracle Merge Rejection Row Count

    - by Andrew
    Given an Oracle Merge statement with a rejection limit, is there a shorthand way to identify how many rows were rejected, without being forced to query the rejection destination? The rejection destination has records pre-merge, so would currently have to be counted twice and the difference taken, but it seems like there should be a counter exposed, given that it has to be aware of whether it has exceeded the rejection limit.

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  • Developing Applications that can interact Lotus Notes (.nsf) databases

    - by sridhar-voleti
    Hi, I am a c# developer interested in developing a windows application to connect to a lotus notes .nsf db and display the information like 1) Number of forms 2) Number of views 3) Script Libraries 4) Actions 5) Agents Once I do this, I want to read each form and the UI elements available in each form and generate an equivalent .aspx file. I have lotus notes client and designer installed on my system. Could some one suggest how to proceed with this requirement? Thanks a lot in advance Sridhar

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  • Oracle: Insertion on an indexed table, avoiding duplicates. Looking for tips and advice.

    - by Tom
    Hi everyone, Im looking for the best solution (performance wise) to achieve this. I have to insert records into a table, avoiding duplicates. For example, take table A Insert into A ( Select DISTINCT [FIELDS] from B,C,D.. WHERE (JOIN CONDITIONS ON B,C,D..) AND NOT EXISTS ( SELECT * FROM A ATMP WHERE ATMP.SOMEKEY = A.SOMEKEY ) ); I have an index over A.SOMEKEY, just to optimize the NOT EXISTS query, but i realize that inserting on an indexed table will be a performance hit. So I was thinking of duplicating Table A in a Global Temporary Table, where I would keep the index. Then, removing the index from Table A and executing the query, but modified Insert into A ( Select DISTINCT [FIELDS] from B,C,D.. WHERE (JOIN CONDITIONS ON B,C,D..) AND NOT EXISTS ( SELECT * FROM GLOBAL_TEMPORARY_TABLE_A ATMP WHERE ATMP.SOMEKEY = A.SOMEKEY ) ); This would solve the "inserting on an index table", but I would have to update the Global Temporary A with each insertion I make. I'm kind of lost here, Is there a better way to achieve this? Thanks in advance,

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  • Variable declared with variable keyword in sql plus(oracle 9i)?

    - by Vineet
    I am trying to declare g_num ,number data type with size it gives an error but in case of varchar2,char it does not. variable g_name varchar2(5);//correct accept size for varchar 2 variable g_num number(23);//Gives an error " VAR[IABLE] [ <variable> [ NUMBER | CHAR | CHAR (n [CHAR|BYTE]) | VARCHAR2 (n [CHAR|BYTE]) | NCHAR | NCHAR (n) | NVARCHAR2 (n) | CLOB | NCLOB | REFCURSOR ] ]" Please suggest!

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  • Getting my head around the practical applications of strong and weak pointers in Objective-C

    - by Chris Wilson
    I've just read the accepted excellent answer to this question that clarifies the conceptual differences between strong and weak pointers in Objective-C, and I'm still trying to understand the practical differences. I come from a C++ background where these concepts don't exist, and I'm having trouble figuring out where I would use one vs the other. Could someone please provide a practical example, using Objective-C code, that illustrates the different uses of strong and weak pointers?

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  • Is garbage collection supported for iPhone applications?

    - by Mustafa
    Does the iPhone support garbage collection? If it does, then what are the alternate ways to perform the operations that are performaed using +alloc and -init combination: NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithData:xmlData]; UIImage *originalImage = [[UIImage alloc] initWithData:data]; detailViewController = [[[DetailViewController alloc] initWithNibName:@"DetailView bundle:[NSBundle mainBundle]] autorelease]; ... and other commands. Thank you in advance for any help or direction that you can provide.

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  • Methods for ensuring security between users in multi-user applications

    - by Emilio
    I'm writing a multiuser application (.NET - C#) in which each user's data is separated from the others and there is no data that's common between users. It's critical to ensure that no user has access to another user's data. What are some approaches for implementing security at the database level and/or in the application architecture to to accomplish this? For example (and this is totally made up - I'm not suggesting it's a good or bad approach) including a userID column in all data tables might be an approach. I'm developing the app in C# (asp.net) and SQL Server 2008. I'm looking for options that are are either native in the tools I'm using or general patterns.

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  • unit, integration and system tests for PHP applications

    - by Sara
    Hi, We were given an assignment to develop a prototype for a customer community. It was suggested PHP as the programming language. (but we're not supposed to actually code it, just a prototype with documentation is required) I'm wondering what are the best practices/ tools used in Unit testing, Integration Testing and System testing for such a php app Thanks

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  • Oracle Application Server 10.1.3.5 Security issue.

    - by Marius Bogdan IONESCU
    Hello! we are tying to port a J2EE app from OAS 9.0.4 (working perfectly) on OAS 10.1.3.5 the reson we do that is because we need the app compiled with java 1.5 and OAS 10.1.3.5 would be the single major version supporting that binaries which has oc4j/orion kernel. The issue is that the security constraints in matter of user/group/role are not read by the app server, and instead of asking for these sets of users, i have to use the oc4jadmin instead the selected users for auth. All xml files needed for describing these sets of rules are being checked with the OAS book, and it seems they are correctly filled in... anybody has an idea about this?

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  • How are SaaS applications organized?

    - by tomekw
    Consider web (MVC, for example Rails) application for multiple clients as a service. How to design this? one application instance per client? (+ one database per client) one instance for all clients (+ one database for all clients) Former one is simple, but... "inefficient". How about the latter? (best practises, design patterns) How to separate client data? For example: worker "A" of client "1" has two documents, worker "B" of client "2" has three documents. How to build model associations to protect other users (and clients) data? I think joining every query with Client model is not a good solution.

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  • How to program asynchronous Windows Forms Applications?

    - by Nestor
    I'm writting a Windows Forms application in C# that performs a lot of long-running procedures. I need to program the application so that the GUI doesn't lock. What is the best way to program it? I know how to use the following: BeginInvoke/EndInvoke Calling Application.DoEvents() repeatedly (probably not a good idea) BackgroundWorker etc. But how to manage GUI state with call backs, etc... is not trivial. Are there solutions for this (in the form of patterns or libraries)?

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  • Autofac in web applications, where should I store the container for easy access

    - by michielvoo
    I'm still pretty new to using Autofac and one thing I miss in the documentation and examples is how to make it easy to get to the configured container from different places in a web application. I know I can use the Autofac controller factory to automatically resolve constructor injected dependencies for controllers, but how about the other stuff you might need to resolve that is not injected yet. Is there an obvious pattern I am not aware of for this? Thank you!

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  • Executing Secondary Applications

    - by JooBlow
    I have an application I am attempting to make "portable". The application contains a lot of secondary utility functions that I would like to execute on external files(from the app). I tried adding them in the build process but I didn't get any "Executables" for them(just the main one and a few others). Is there a way to get these to excute? They are basically command line utility functions to process some text files but use large files in the distribution and are also used by the main application. Thanks

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