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  • Hibernate: Found: float, expected: double precision

    - by Frederic Morin
    I have a problem with the mapping of Oracle Float double precision datatype to Java Double datatype. The hibernate schema validator seems to fail when the Java Double datatype is used. org.hibernate.HibernateException: Wrong column type in DB.TABLE for column amount. Found: float, expected: double precision The only way to avoid this is to disable schema validation and hope the schema is in sync with the app about to run. I must fix this before it goes out to production. App's evironment: - Grails 1.2.1 - Hibernate-core 3.3.1.GA - Oracle 10g

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  • Schema compare with MS Data Tools in VS2008

    - by rdkleine
    When performing a schema compare having db_owner rights on the target database results in the following error: The user does not have permission to perform this action. Using the SQL Server Profiler I figured out this error occurs executing a query targeting the master db view: [sys].[dm_database_encryption_keys] While specifically ignoring all object types but Tables one would presume the SQL Compare doesn't need access to the db encryption keys. Also note: http://social.msdn.microsoft.com/Forums/en-US/vstsdb/thread/c11a5f8a-b9cc-454f-ba77-e1c69141d64b/ One solution would be to GRANT VIEW SERVER STATE to the db user, but in my case I'm not hosting the database services and won't get the rights to the server state. Also tried excluding DatabaseEncryptionKey element in the compare file. <PropertyElementName> <Name>Microsoft.Data.Schema.Sql.SchemaModel.SqlServer.ISql100DatabaseEncryptionKey</Name> <Value>ExcludedType</Value> </PropertyElementName> Anyone has an workaround this?

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  • LRU cache design

    - by user297850
    Least Recently Used (LRU) Cache is to discard the least recently used items first How do you design and implement such a cache class? The design requirements are as follows: 1) find the item as fast as we can 2) Once a cache misses and a cache is full, we need to replace the least recently used item as fast as possible. How to analyze and implement this question in terms of design pattern and algorithm design?

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  • Creating and Indexing Email Database using SqlCe

    - by Anindya Chatterjee
    I am creating a simple email client program. I am using MS SqlCe as a storage of emails. The database schema for storing the message is as follows: StorageId int IDENTITY NOT NULL PRIMARY KEY, FolderName nvarchar(255) NOT NULL, MessageId nvarchar(3999) NOT NULL, MessageDate datetime NOT NULL, StorageData ntext NULL In the StorageData field I am going to store the MIME message as byte array. But the problem arises when I am going to implement search on the stored messages. I have no idea how I am going to index the messages on top of this schema. Can anyone please help me in suggesting a good but simple schema, so that it will be effective in terms of storage space and search friendliness as well? Regards, Anindya Chatterjee

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  • .Net Xml Serialize - XSD Definition for Multiple Namespaces

    - by MattH
    The following XML was generated by serializing .Net objects: <?xml version="1.0" encoding="utf-8"?> <Request xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://EPS.WebServices/WebServiceSchema" > <Method xmlns="http://EPS.Library/RequestSchema">PackPlacementUpdate</Method> <Type xmlns="http://EPS.Library/RequestSchema">PackPlacementUpdate</Type> </Request> I am using XSD to generate a schema. However, (I think) because there are multiple namespaces two different schema files get generated. We will be providing the XSD file externally and I'm concerned that two files will cause confusion. Without changing the namespace of the .Net classes, is there is a way I can create a single XSD schema file and not two? Thanks.

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  • Can't find .Net 2.0 XML Schema

    - by Zach Smith
    I'm currently setting up an application config for a WPF application written in .Net 4.0. The connection string in the app.config is encrypted like so: <connectionStrings configProtectionProvider="DataProtectionConfigurationProvider"> <EncryptedData> <CipherData> <CipherValue>CypherValue</CipherValue> </CipherData> </EncryptedData> </connectionStrings> To use the EncryptedData element I need to include the XMLNS "http://schemas.microsoft.com/.NetConfiguration/v2.0". Attempting to include it produces an error as the schema cannot be found. Is there a way to include the schema or perhaps a different element I could use instead of EncryptedData?

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  • how to compare/validate sql schema

    - by Ron Harlev
    I'm looking for a way to validate the SQL schema on a production DB after updating an application version. If the application does not match the DB schema version, there should be a way to warn the user and list the changes needed. Is there a tool or a framework (to use programatically) with built-in features to do that? Or is there some simple algorithm to run this comparison? Update: Red gate lists "from $395". Anything free? Or more foolproof than just keeping the version number?

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  • Star schema [fact 1:n dimension]...how?

    - by Mike Gates
    I am a newcomer to data warehouses and have what I hope is an easy question about building a star schema: If I have a fact table where a fact record naturally has a one-to-many relationship with a single dimension, how can a star schema be modeled to support this? For example: Fact Table: Point of Sale entry (the measurement is DollarAmount) Dimension Table: Promotions (these are sales promotions in effect when a sale was made) The situation is that I want a single Point Of Sale entry to be associated with multiple different Promotions. These Promotions cannot be their own dimensions as there are many many many promotions. How do I do this?

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  • How to override old design with new design(using master pages)?

    - by arun
    Hi, iam migrating the site from asp.net1.1 to asp.net3.5, iam using new design layout with masterpage concept,in previeous site some pages are having usercontrols,these are mixed with old design, if i convert it using masterpage, iam getting old design combining with new design...pls can any one will help?iam fresher to development. Thanks in advance.

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  • Webservice description - xsd schema and xml generation

    - by dominolog
    Hello I want to design a WebService for communication between Win Mobile 6.5 based Palm device and a PHP web server. The Palm device software will be developed on .NET compact framework. The communication between web server and device I envision as XML over HTTP. I want a tool that will let me design the Webservice (interfaces, methods) and then generate the xsd schema together with xml messages for the communication. Can you recommend something? Regards

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  • problem with doctrine:build-schema

    - by Ying
    Hi, im using symfony with doctrine, and Im trying to generate the schema yml file from a db. I get an this error SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'group' at line 1. Failing Query: "DESCRIBE group"I have a table named group in my database, and I suspect that this is screwing it up. Its not access problems as ive checked my db previleges. Any suggestions on what I can do? I have tried the quote-identifier attribute but with no luck : ( Im also struggling to find some good doctrine documentation. i cant seem to find where a list of attributes are, say for a creating a column in the schema.yml file. I tried reaching out to symfony forums but they are not responsive! Any help would be greatly appreciated! Thanks..

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  • Dealing with schema upgrades while using Hibernate

    - by nehagp
    I'm using Hibernate as the ORM for my application. I would like to know if there is a good solution to dealing with schema upgrades in my application when these upgrades are done by someone else. For example, I have a set of hbm.xml files and corresponding java classes generated using Hibernate tools. Now in production, everything works fine until the db schema is upgraded (tables/columns may be dropped/added). I do not (my app doesn't) have access to do that so how do I deal with this using Hibernate? Thanks!

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  • Exporting MS SQL Schema and Data

    - by stringo0
    I'm used to MySQL and PHPMyAdmin - I had to switch over to MSSQL for an ASP.net project, and I'm having tons of trouble. I'm using the express version of SQL 2008, with SQL Server Management Studio. The following are 2 questions I've been struggling with for a while: 1) How do I export the DB schema for the database? The table structure, etc.? 2) How do I export all the data in the database? Ideally I'd like to have a .sql file that can be run wherever I need the schema or data duplicated, for example a co-worker's computer for a shared project, or online when the project is being hosted. Thanks!

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  • Any good tutorials or resources for learning how to design a scalable and "component" based game 'fr

    - by CodeJustin.com
    In short I'm creating a 2D mmorpg and unlike my last "mmo" I started developing I want to make sure that this one will scale well and work well when I want to add new in-game features or modify existing ones. With my last attempt with an avatar chat within the first few thousand lines of code and just getting basic features added into the game I seen my code quality lowering and my ability to add new features or modify old ones was getting lower too as I added more features in. It turned into one big mess that some how ran, lol. This time I really need to buckle down and find a design that will allow me to create a game framework that will be easy to add and remove features (aka things like playing mini-games within my world or a mail system or buddy list or a new public area with interactive items). I'm thinking that maybe a component based approach MIGHT be what I'm looking for but I'm really not sure. I have read documents on mmorpg design and 2d game engine architecture but nothing really explained a way of designing a game framework that will basically let me "plug-in" new features into the main game and use the resources of the main game without changing much within my 'main game code'. Hope someone understands what I mean, any help will is appreciated.

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  • Is it poor design to create objects that only execute code during the constructor?

    - by Curtix
    In my design I am using objects that evaluate a data record. The constructor is called with the data record and type of evaluation as parameters and then the constructor calls all of the object's code necessary to evaluate the record. This includes using the type of evaluation to find additional parameter-like data in a text file. There are in the neighborhood of 250 unique evaluation types that use the same or similar code and unique parameters coming from the text file. Some of these evaluations use different code so I benefit a lot from this model because I can use inheritance and polymorphism. Once the object is created there isn't any need to execute additional code on the object (at least for now) and it is used more like a struct; its kept on a list and 3 properties are used later. I think this design is the easiest to understand, code, and read. A logical alternative I guess would be using functions that return score structs, but you can't inherit from methods so it would make it kind of sloppy imo. I am using vb.net and these classes will be used in an asp.net web app as well as in a distributed app. thanks for your input

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  • Is there a design pattern that expresses objects (an their operations) in various states?

    - by darren
    Hi I have a design question about the evolution of an object (and its state) after some sequence of methods complete. I'm having trouble articulating what I mean so I may need to clean up the question based on feedback. Consider an object called Classifier. It has the following methods: void initialise() void populateTrainingSet(TrainingSet t) void pupulateTestingSet(TestingSet t) void train() void test() Result predict(Instance i) My problem is that these methods need to be called in a certain order. Futher, some methods are invalid until a previous method is called, and some methods are invalid after a method has been called. For example, it would be invalid to call predict() before test() was called, and it would be invalid to call train() after test() was called. My approach so far has been to maintain a private enum that represents the current stateof the object: private static enum STATE{ NEW, TRAINED, TESTED, READY}; But this seems a bit cloogy. Is there a design pattern for such a problem type? Maybe something related to the template method.

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  • Which is the correct design pattern for my PHP application?

    - by user1487141
    I've been struggling to find good way to implement my system which essentially matches the season and episode number of a show from a string, you can see the current working code here: https://github.com/huddy/tvfilename I'm currently rewriting this library and want a nicer way to implement how the the match happens, currently essentially the way it works is: There's a folder with classes in it (called handlers), every handler is a class that implements an interface to ensure a method called match(); exists, this match method uses the regex stored in a property of that handler class (of which there are many) to try and match a season and episode. The class loads all of these handlers by instantiating each one into a array stored in a property, when I want to try and match some strings the method iterates over these objects calling match(); and the first one that returns true is then returned in a result set with the season and episode it matched. I don't really like this way of doing it, it's kind of hacky to me, and I'm hoping a design pattern can help, my ultimate goal is to do this using best practices and I wondered which one I should use? The other problems that exist are: More than one handler could match a string, so they have to be in an order to prevent the more greedy ones matching first, not sure if this is solvable as some of the regex patterns have to be greedy, but possibly a score system, something that shows a percentage of how likely the match is correct, i'd have no idea how to actually implement this though. I'm not if instantiating all those handlers is a good way of doing it, speed is important, but using best practices and sticking to design patterns to create good, extensible and maintainable code is my ultimate priority. It's worth noting the handler classes sometimes do other things than just regex matching, they sometimes prep the string to be matched by removing common words etc. Cheers for any help Billy

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  • How to force VS to react on a changing of an attached property in design time?

    - by sedovav
    Imagine, we have a wpf class library with a window1.xaml and a resource dictionary res.xaml defined in it. I know how to use styles that defined in the res.xaml for the controls that defined into the window: <Window x:Class="...Window1"> <Window.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="res.xaml"/> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> <\Window.Resources> </Window> So we can use the dictionary's styles for all elements into the window (except the window element... I don't know how to set the style from the res.xaml for the window :( ). I saw the article where describes how to create and use attached property to add resource dictionaries to a FrameworkElement.Resources.MergedDictionaries list. It's good! We can do the same as we done in the example above but we can use the window style now. It looks like this: <Window x:Class="...Window1" xmlns: resources="..." resources:SharedResources.MergedDictionaries="res.xaml"> </Window> That's good but VS2008 cannot recognize resources from res.xaml in design time. So we have a sad situation: all styles from res.xaml are available in run-time but in the design-time VS cannot display the window (it can't find the mentioned styles). Does anybody know how to fix this situation?

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  • Is Using Tuples in my .NET 4.0 Code a Poor Design Decision?

    - by Jason Webb
    With the addition of the Tuple class in .net 4, I have been trying to decide if using them in my design is a bad choice or not. The way I see it, a Tuple can be a shortcut to writing a result class (I am sure there are other uses too). So this: public class ResultType { public string StringValue { get; set; } public int IntValue { get; set; } } public ResultType GetAClassedValue() { //..Do Some Stuff ResultType result = new ResultType { StringValue = "A String", IntValue = 2 }; return result; } Is equivalent to this: public Tuple<string, int> GetATupledValue() { //...Do Some stuff Tuple<string, int> result = new Tuple<string, int>("A String", 2); return result; } So setting aside the possibility that I am missing the point of Tuples, is the example with a Tuple a bad design choice? To me it seems like less clutter, but not as self documenting and clean. Meaning that with the type ResultType, it is very clear later on what each part of the class means but you have extra code to maintain. With the Tuple<string, int> you will need to look up and figure out what each Item represents, but you write and maintain less code. Any experience you have had with this choice would be greatly appreciated.

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