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  • Creating application using rails 2.3.5 and cassandra database

    - by Joshi
    hi all, Pls guide me how to create rails application using rails 2.3.5 and cassandra database as rails 2.3.5 supports mysql, sqllite etc. I typed in the command prompt like this $ rails -d cassandra myapp Databases supported for preconfiguration are: mysql, oracle, postgresql, sqlite2, sqlite3, frontbase, ibm_db So pls help me in this regard

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  • Reference Object calling function in Javascript

    - by Louis
    I have a makeshift events system in JS and the attacher looks like this: events.attach(events.NEW_TASK,this.update); Where this.update is a callback/handler/function. The problem is, when the dispatcher tries to call this handler, it loses it's original context. How can I bind the handler with the context of the object that calls the attach function without passing this as an argument and using that?

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  • How to provide default argument as this object?

    - by atch
    I would like to have declaration like this: void Date::get_days_name(const Date& = this) which I would understand that if no argument is provided use this object as an argument. For some reason in VS I'm getting err msg: 'Error 1 error C2355: 'this' : can only be referenced inside non-static member ' Any idea what I'm doing wrong?

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  • How to use an external file for database configuration in EJB environment

    - by bosnic
    I need to have a file for database configuration outside of EAR file of my EJB application. Even if I define a datasource and call it via JNDI, I still have some properties that I want to change, like hibernate.dialect or hibernate.show_sql, for example. I tried using: <property name="hibernate.ejb.cfgfile" value="some-file.xml" /> and it works fine when some-file.xml is in jar file, but how to call it from another location. I tried file:/// but didn´t work. thanks

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  • Check if Ruby object is a Boolean

    - by viatropos
    Can't seem to find how to check if an object is a boolean easily. Is there something like this in Ruby? true.is_a?(Boolean) false.is_a?(Boolean) Right now I'm doing this and would like to shorten it: some_var = rand(1) == 1 ? true : false (some_var.is_a?(TrueClass) || some_var.is_a?(FalseClass))

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  • 32bit to 64bit sql server 2008 database conversion

    - by Eric
    We are in the process of moving databases from older 32 bit hardware running sql 2005 to newer hardware with sql 2008 64 bit. My question is if the database is automatically converted to 64bit after it is reattached on the new server or if it is running in 32bit mode on a 64bit instance. Is there a way to tell?

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  • How to do motion tracking of a object using video

    - by Niroshan
    Could someone direct me to a tutorial or guide me how to track motion of a object moving with 6 DOF. I am planing to use a video stream of a moving toy car. I want to calculate displacement and rotation angle of the toy car. I came across some research papers but couldn't find any libraries to the job. Is there a way to do this using OpenCV or Matlab or some other freely available software? Thank you

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  • gae error:AttributeError: 'NoneType' object has no attribute 'user_is_member'

    - by zjm1126
    class Thread(db.Model): members = db.StringListProperty() def user_is_member(self, user): return str(user) in self.members and thread = Thread.get(db.Key.from_path('Thread', int(id))) is_member = thread.user_is_member(user) but the error is : Traceback (most recent call last): File "D:\Program Files\Google\google_appengine\google\appengine\ext\webapp\__init__.py", line 511, in __call__ handler.get(*groups) File "D:\Program Files\Google\google_appengine\google\appengine\ext\webapp\util.py", line 62, in check_login handler_method(self, *args) File "D:\zjm_code\forum_blog_gae\main.py", line 222, in get is_member = thread.user_is_member(user) AttributeError: 'NoneType' object has no attribute 'user_is_member' why ? thanks

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  • Calling javascript method from from inside object

    - by John
    I am struggling with methods in JavaScript. obj = function(){ this.getMail = function getMail (){ } //Here I would like to run the get mail once but this.getMail() or getMail() wont work } var mail = new obj(); mail.getMail(); How do I make the method in a way that I can run it both inside the object and from the outside Thanks

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  • How to relink existing shared library with extra object file

    - by awy
    I have existing Linux shared object file (shared library) which has been stripped. I want to produce a new version of the library with some additional functions included. I had hoped that something like the following would work, but does not: ld -o newlib.so newfuncs.o --whole-archive existinglib.so I do not have the source to the existing library. I could get it but getting a full build environment with the necessary dependencies in place would be a lot of effort for what seems like a simple problem.

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  • The Best Way to shred XML data into SQL Server database columns

    - by eddiegroves
    What is the best way to shred XML data into various database columns? So far I have mainly been using the nodes and value functions like so: INSERT INTO some_table (column1, column2, column3) SELECT Rows.n.value('(@column1)[1]', 'varchar(20)'), Rows.n.value('(@column2)[1]', 'nvarchar(100)'), Rows.n.value('(@column3)[1]', 'int'), FROM @xml.nodes('//Rows') Rows(n) However I find that this is getting very slow for even moderate size xml data.

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  • Why is Serializable Attribute required for an object to be serialized

    - by Keivan
    Based on my understanding SerializableAttribute provides no compile time checks, as its all done at runtime, then why is it required for classes to be marked as serializable? Couldn't sterilizer just try to serialize an object and just fail? isn't it what it does right-now when something is marked, it tries and fails. wouldn't it be better if you had to mark things as unserializable rather than serializable? that way you wouldn't have the problem of libraries not marking things as serializable?

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  • Connecting to remote mysql database with API

    - by Ajay
    I am designing a desktop application in C#, which needs to be connected to my online mysql database. I tried to give access in control panel a "%" which means from any IP, but it is not working. May be the hosting provider (bigrock) not allowing that. Alternatively, I am trying to write some code in online on PHP which will get the "sql" as parameter and returns the output as JSON format using json_encode. Is there any alternate methods which is better approach.

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  • Creating a shared HSQLDB database

    - by Robert Munteanu
    In-process HSQLDB database are not expected to be opened by others, even for file-based storage. The documentation hints that this is possible: Server Modes, Advanced Topics, but I've not yet found a URL for how to activate this behaviour. Did anyone do this so they can share how to?

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