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  • iphone tab bar controller and core data.

    - by Sway
    Ok bit of a newbie type question. I want to use Core Data, together with Tab and Navigation controllers. In XCode if I create a Navigation Based Application I get the option to choose Core Data. Whereas If I create a Tab Bar Application I don't get the choice. I understand that Tab Bars display view controllers so it kinda makes sense. However given that by default it sticks the basic Core Data code in the Application delegate I don't see why this isn't offered. At the moment I'm creating the two projects and cutting and pasting between them. Does this omission in XCode seem weird to you? Is it some sort of oversight? Thanks, Matt

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  • Seed data for grails application

    - by bsreekanth
    Hello, What is the best way to load seed (initial or test) data into grails application. I'm considering 3 options 1. Putting everything in *BootStrap.groovy files. This is tedious if the domain classes and test data are many. 2. Write custom functionality to load it through xml. May not be too difficult with the excellent xml support by groovy, but lot of switch statements for different domain classes. 3. Use Liquibase LoadData api. I see you can load the data fairly easy from csv files. Choice 3 seems the easiest. But, I'm not familiar with Liquibase. Is it good in this scenario, or only used for migration, db changes etc. If anyone could provide a better sol, or point to an example with Liquibase, it would be great help.. thanks...

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  • Chrome Web Browser Messages: Some Observations

    - by ultan o'broin
    I'm always on the lookout for how different apps handle errors and what kind of messages are shown (I probably need to get out more), I use this 'research' to reflect on our own application error messages patterns and guidelines and how we might make things better for our users in future. Users are influenced by all sorts of things, but their everyday experiences of technology, and especially what they encounter on the internet, increasingly sets their expectations for the enterprise user experience too. I recently came across a couple of examples from Google's Chrome web browser that got me thinking. In the first case, we have a Chrome error about not being able to find a web page. I like how simple, straightforward messaging language is used along with an optional ability to explore things a bit further--for those users who want to. The 'more information' option shows the error encountered by the browser (or 'original' error) in technical terms, along with an error number. Contrasting the two messages about essentially the same problem reveals what's useful to users and what's not. Everyone can use the first message, but the technical version of the message has to be explicitly disclosed for any more advanced user to pursue further. More technical users might search for a resolution, using that Error 324 number, but I imagine most users who see the message will try again later or check their URL again. Seems reasonable that such an approach be adopted in the enterprise space too, right? Maybe. Generally, end users don't go searching for solutions based on those error numbers, and help desk folks generally prefer they don't do so. That's because of the more critical nature of enterprise data or the fact that end users may not have the necessary privileges to make any fixes anyway. What might be more useful here is a link to a trusted source of additional help provided by the help desk or reputable community instead. This takes me on to the second case, this time more closely related to the language used in messaging situations. Here, I first noticed by the using of the (s) approach to convey possibilities of there being one or more pages at the heart of the problem. This approach is a no-no in Oracle style terms (the plural would be used) and it can create translation issues (though it is not a show-stopper). I think Google could have gone with the plural too. However, of more interest is the use of the verb "kill", shown in the message text and as an action button label. For many writers, words like "kill" and "abort" are to be avoided as they can give offense. I am not so sure about that judgment, as really their use cannot be separated from the context. Certainly, for more technical users, they're fine and have been in use for years, so I see no reason to avoid these terms if the audience has accepted them. Most end users too, I think would find the idea of "kill" usable and may even use the term in every day speech. Others might disagree--Apple uses a concept of Force Quit, for example. Ultimately, the only way to really know how to proceed is to research these matter by asking users of differing roles and expertise to perform some tasks, encounter these messages and then make recommendations based on those findings for our designs. Something to do in 2011!

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  • Automating scraping of table data to XML

    - by thewinchester
    Problem I have a YQL query result that I'm trying to get converted and sort into a clean XML file. Background Being the pains that they are, information from the World Cup isn't freely available in an easy to reuse format. So, after a bit of finessing with YQL I have managed to liberate the required table rows which contain the data I'm after. The YQL query can be viewed at: http://query.yahooapis.com/v1/public/yql/ravingbeefsteak/worldcup2010groupliberator?diagnostics=true I'd like to now convert this information into XML, and being an absolute n00b I don't know where to start or what to look for. I'm also needing to do a find and replace on the data to get the URL's working as they should without manual changes, and hopefully an initial sorting of the data. If anyone can point me in the right direction of what I need to be doing to make my needs a reality it would be greatly appreciated.

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  • when to introduce an application services tier in an n-tier application

    - by user20358
    I am developing a web based application whose primary objective is to fetch data from the database, display it on the UI, take in user inputs and write them back to the database. The application is not going to be doing any industrial strength algorithm crunching, but will be receiving a very high number of hits at peak times (described below) which will be changing thru the day. The layers are your typical Presentation, Business, Data. The data layer is taken care of by the database server. The business layer will contain the DAL component to access the database server over tcp. The choices I have to separate these layers into tiers are: The presentation and business layers can be either kept on the same tier. The presentation layer on a separate tier by itself and the business layer on a separate tier by itself. In the case of choice 2, the business layer will be accessed by the presentation layer using a WCF service either over http or tcp. I don't see any heavy processing being done on the Business layer, so I am leaning towards option 1 above. I also feel for the same reason, adding a new tier will only introduce the network latency. However, in terms of scalability in case I need to scale up or scale out, which is a better way to go? This application will need to be able to support up to 6 million users an hour. There will be a reasonable amount of data in each user session, storing user's preferences and other details. I will be using page level caching as well.

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  • Sorting NSSets of a core data entity - Objective-c

    - by ncohen
    Hi everyone, I would like to sort the data of a core data NSSet (I know we can do it only with arrays but let me explain...). I have an entity user who has a relationship to-many with the entity recipe. A recipe has the attributes name and id. I would like to get the data such that: Code: NSArray *id = [[user.recipes valueForKey:@"identity"] allObjects]; NSArray *name = [[user.recipes valueForKey:@"name"] allObjects]; if I take the object at index 1 in both arrays, they correspond to the same recipe... Thanks

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  • How to persist a very abstract data type between sessions: PHP

    - by Greelmo
    I have an abstract data type that behaves much like stack. It represents a history of "graph objects" made by a particular user. Each "graph object" holds one or more "lines", a date range, keys, and a title. Each "line" holds a sql generator configured for a particular subset of data in my db. I would like for these "histories" to be available to users between their sessions. It will be in the form of a tab that reads something like "most recent graphs". What do you believe to be the best way to persist this type of data between sessions. This application could get rather large, so efficiency is a concern. Thanks in advance.

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  • Trying to learn how to use WCF services in a WPF app, using MVVM

    - by Rod
    We're working on a major re-write of a legacy VB6 app, into a WPF app. I've written several WCF services, which are meant to be used with the new WPF app. We want to use the MVVM design pattern to do this, but we don't have experience at that. So, in order to learn MVVM we've watched a video on WindowsClient called How Do I: Build Data-driven WPF Application using the MVVM pattern. This is a great introduction, and we refer to it a lot, but for our situation it doesn't quite give us enough. For example, we're not certain how to use datasets returned by my WCF services in our new WPF app using the ideas that Todd Miranda introduced in the video I referenced. If we did as we think we're supposed to do, then we should design a class that is exactly like the class of data returned in my WCF service. But we're wondering, why do that, when the WCF service already has such a class? And yet, the class in the WPF app has to at least implement the INotifyPropertyChanged interface. So, we're not sure what to do.

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  • Protecting Data Feed for iPhone App

    - by Chris
    I am creating an App that pulls data from a file on my server. That file gets data from my database, based on GET values that are passed through the URL. I would like to keep this feed closed - that is, I don't want people finding the datasource and reading the data on their own. I considered sending an alphanumeric id along with the url string, but if they can find the URL that I am calling, then there won't be anything preventing them from grabbing that alphanumeric id also. I am looking for any ideas or experiences that might help me here. Thanks.

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  • Suggest Cassandra data model for an existing schema

    - by Andriy Bohdan
    Hello guys! I hope there's someone who can help me suggest a suitable data model to be implemented using nosql database Apache Cassandra. More of than I need it to work under high loads and large amounts of data. Simplified I have 3 types of objects: Product Tag ProductTag Product: key - string key name - string .... - some other fields Tag: key - string key name - unique tag words ProductTag: product_key - foreign key referring to product tag_key - foreign key referring to tag rating - this is rating of tag for this product Each product may have 0 or many tags. Tag may be assigned to 1 or many products. Means relation between products and tags is many-to-many in terms of relational databases. Value of "rating" is updated "very" often. I need to be run the following queries Select objects by keys Select tags for product ordered by rating Select products by tag order by rating Update rating by product_key and tag_key The most important is to make these queries really fast on large amounts of data, considering that rating is constantly updated.

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  • Interpolation of scattered data: What could I do?

    - by Simon
    Hi! I need your help. I'm working on a 3D chart in Java using Java 3D. It should be able to display a bunch of measured values. As measured, the data I get is scattered. This means I will have to interpolate the missing points in order to get my surface plotted nicely. I didn't study all that 3D-Geometry stuff yet and I don't know where to start. My idea is to triangulate the points to a surface and then, based on the triangulation, interpolate the missing points. (see this to have a rough idea of what I want to achieve) Does someone have experiences with the interpolation of scattered data? Is my approach the right one? If yes, what kind of data structures and algorithms will I need in order to triangulate my points cloud?

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  • Functional data structures in C++

    - by drg
    Does anyone know of a C++ data structure library providing functional (a.k.a. immutable, or "persistent" in the FP sense) equivalents of the familiar STL structures? By "functional" I mean that the objects themselves are immutable, while modifications to those objects return new objects sharing the same internals as the parent object where appropriate. Ideally, such a library would resemble STL, and would work well with Boost.Phoenix (caveat- I haven't actually used Phoenix, but as far as I can tell it provides many algorithms but no data structures, unless a lazily-computed change to an existing data structure counts - does it?)

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  • Core Data store corruption

    - by sehugg
    A handful of customers for my iPhone app are experiencing Core Data store corruption (I assume so, since the error is "Failed to save to data store: Operation could not be completed. (Cocoa error 259.)") Has anyone else experienced this kind of store corruption? I am worried since I aim to soon push an update which performs a schema migration, and I am worried that this will expose even more problems. I had assumed that the Core Data/SQLlite APIs use atomic operations and are immune to corruption except if the underlying filesystem experiences corruption. Is there a way to reduce/prevent corruption, or at least a good way to reproduce (I have been unsuccessful thus far).

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  • Looking for a Magnetic Card Reader with data storage

    - by Omar Sharif
    I am looking for a magnetic card reader with data storage of about 2 GB. This reader be placed in open under a shade, but would be exposed to temperatures from -5 C to 50 C. Job is to swipe customer loyalty cards issued to regular customers of a gas station. Each time they get gas filled, they will swipe their card, to mark their presence. Swiped data be stored in the reader. And on intervals be transferred to a PC lying in the office. The customer visits data be used to award some gifts or benefits to frequently visiting clients. Any ready-made solutions available ? Please advise. Omar

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  • Reporting on data when data is missing (ie. how to report zero activities for a customer on a given

    - by Christian Vik
    I want to create a report which aggregates the number of activities per customer per week. If there has been no activites on that customer for a given week, 0 should be displayed (i.e week 3 and 4 in the sample below) CUSTOMER | #ACTIVITIES | WEEKNUMBER A | 4 | 1 A | 2 | 2 A | 0 | 3 A | 0 | 4 A | 1 | 5 B ... C ... The problem is that if there are no activities there is no data to report on and therefor week 3 and 4 in the sample below is not in the report. What is the "best" way to solve this?

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  • Faking a dynamic schema in Core Data?

    - by Gouldsc
    From reading the Apple Docs on Core Data, I've learned that you should not use Core Data when you need a dynamic schema. If I wanted to provide the user the ability to create their own properties, in a core data model would it work if I created some "dummy" attributes like "custom decimal 1", "custom decimal 2", "custom text 1", "custom text 2" etc that the user could name and use for their own purposes? Obviously this won't work for relationships, but for simple properties it seems like a reasonable workaround. Will creating a bunch of dummy attributes on my entities that go unused by most users noticeably decrease performance for them? Have any of you tried something like this? Thanks!

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  • creating managed objects using code in xcode & core-data

    - by themadpeacock
    New to objective-c xcode and core-data so sorry for the remedial question. I have set up a very simple data model: Entity1 and Entity2, both contain a single attribute (String) and a one-to-many relationship with the other. I want to scan Entity1 and depending on the results of the scan create one or more Entity2 objects that link to Entity1. How can I do this? I don’t understand how I create Entity2 type objects in code and how I would define the relationship to the Entity1 object they are related to. I come from a SQL programming background where inserting elements into the Entity2 table with the ID of the related Entiry1 entry is easy. I can’t get my head around the xcode core-data abstraction and would appreciate any help.

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  • WPF data grid - Column Header not aligned with data rows

    - by Pawan
    Hi, I am using Datagrid in WPF. This is a very simple and basic implementation. I not using any styles. I created a simple datagrid : <dg:DataGrid x:Name="dg" > </dg:DataGrid> and populated it with data as: dg.ItemsSource = " H E L L O W O R L D!".Split(); Grid gets properly populated but the columnheader of the grid is drawn with some offset. Due to this my data and header are mis aligned. I tried searching for this over net but I haven't found anything. This seems to be a straightforward implementation which is working for everyone except me :(. Can anyone please tell me what might be going wrong? I have tried using different data sets and appyling some style to test this. Thanks in advance.

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  • Best/Most Comprehensive API for Stocks/Financial Data

    - by Wilco
    What is the most recommended free/public API for accessing financial market stats and stock quotes (preferrably real-time quotes)? I'm not too picky about how it's exposed (SOAP, REST, some proprietary XML setup, etc.), as long as it's got some decent documentation. I'm planning to build a simple web dashboard in PHP with some basic data (basically a quick-n-dirty homepage), but may want to grow it into a full blown web app eventually. Any thoughts? As I find some, I'll post a list here (feel free to comment if you've used any of them before): Free opentick (soprano) Not Free XigniteRealTime

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  • What type of data is this JavaScript code!?

    - by SolidSnakeGTI
    Hello, Well, I'm completely new to JavaScript. Can you please tell me what type of data is this JavaScript code: var options = { sourceLanguage: 'en', destinationLanguage: ['hi', 'bn', 'fa', 'gu', 'kn', 'ml', 'mr', 'ne', 'pa', 'ta','te','ur'], shortcutKey: 'ctrl+g', transliterationEnabled: true }; I've reviewed JavaScript arrays, but it doesn't seem to be a traditional array. Still don't know if it's some kind of arrays or another data type!! Additionally, is there any way to set individual elements to that data type such as setting array elements individually. Thanks in advance

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  • Google Toolbox For Mac with Core Data on iPhone results in error

    - by JaanusSiim
    I have set up my project for using Google Toolbox for Mac as described on official wiki. And everything is working as expected. For core data usage I have created a 'database' class that uses for final application SQLite storage (this is done based on Xcode template code). For unit tests I have created separate init method for 'database' to use in memory storage (storage url is [NSURL URLWithString:@"memory://store"] and type NSInMemoryStoreType). Without adding my model file (*.xcdatamodel) to unit tests target, test fail in expected place with message: executeFetchRequest:error: A fetch request must have an entity. If I add model file to the test target, then test is executed as expected (core data part looks OK), but after tests execution I get: RunIPhoneUnitTest.sh: line 123: 9487 Segmentation fault "$TARGET_BUILD_DIR/$EXECUTABLE_PATH" -RegisterForSystemEvents Command /bin/sh failed with exit code 139 This problem does not looks directly related to core data, but only happens if model file is added to target. Any pointers on resolving this issue would be appreciated!

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  • Core Data vs SQLite 3

    - by Jason Medeiros
    I am already quite familiar with relational databases and have used SQLite (and other databases) in the past. However, Core Data has a certain allure, so I am considering spending some time to learn it for use in my next application. Is there much benefit to using Core Data over SQLite, or vice versa? What are the pros/cons of each? I find it hard to justify the cost of learning Core Data when Apple doesn't use it for many of its flagship applications like Mail.app or iPhoto.app - instead opting for SQLite databases. SQLite is also used extensively on the iPhone. Can those familiar with using both comment on their experience? Perhaps, as with most things, the question is deeper than just using one over the other?

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  • New R Interface to Oracle Data Mining Available for Download

    - by charlie.berger
      The R Interface to Oracle Data Mining ( R-ODM) allows R users to access the power of Oracle Data Mining's in-database functions using the familiar R syntax. R-ODM provides a powerful environment for prototyping data analysis and data mining methodologies. R-ODM is especially useful for: Quick prototyping of vertical or domain-based applications where the Oracle Database supports the application Scripting of "production" data mining methodologies Customizing graphics of ODM data mining results (examples: classification, regression, anomaly detection) The R-ODM interface allows R users to mine data using Oracle Data Mining from the R programming environment. It consists of a set of function wrappers written in source R language that pass data and parameters from the R environment to the Oracle RDBMS enterprise edition as standard user PL/SQL queries via an ODBC interface. The R-ODM interface code is a thin layer of logic and SQL that calls through an ODBC interface. R-ODM does not use or expose any Oracle product code as it is completely an external interface and not part of any Oracle product. R-ODM is similar to the example scripts (e.g., the PL/SQL demo code) that illustrates the use of Oracle Data Mining, for example, how to create Data Mining models, pass arguments, retrieve results etc. R-ODM is packaged as a standard R source package and is distributed freely as part of the R environment's Comprehensive R Archive Network (CRAN). For information about the R environment, R packages and CRAN, see www.r-project.org. R-ODM is particularly intended for data analysts and statisticians familiar with R but not necessarily familiar with the Oracle database environment or PL/SQL. It is a convenient environment to rapidly experiment and prototype Data Mining models and applications. Data Mining models prototyped in the R environment can easily be deployed in their final form in the database environment, just like any other standard Oracle Data Mining model. What is R? R is a system for statistical computation and graphics. It consists of a language plus a run-time environment with graphics, a debugger, access to certain system functions, and the ability to run programs stored in script files. The design of R has been heavily influenced by two existing languages: Becker, Chambers & Wilks' S and Sussman's Scheme. Whereas the resulting language is very similar in appearance to S, the underlying implementation and semantics are derived from Scheme. R was initially written by Ross Ihaka and Robert Gentleman at the Department of Statistics of the University of Auckland in Auckland, New Zealand. Since mid-1997 there has been a core group (the "R Core Team") who can modify the R source code archive. Besides this core group many R users have contributed application code as represented in the near 1,500 publicly-available packages in the CRAN archive (which has shown exponential growth since 2001; R News Volume 8/2, October 2008). Today the R community is a vibrant and growing group of dozens of thousands of users worldwide. It is free software distributed under a GNU-style copyleft, and an official part of the GNU project ("GNU S"). Resources: R website / CRAN R-ODM

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  • Retrieve binary data from S3 storage through AWS.NET in C#

    - by BerggreenDK
    I've tested most of the included samples in the AWS SDK for .NET and they all works fine. I can PUT objects, LIST objects and DELETE objects in a bucket, but... lets say I delete the original and want to sync those files missing locally? I would like to make a GET object (by key/name and bucket ofcause). I can find the object, but how do I read the binary data from S3 through the API? Do I have to write my own SOAP wrapper for this or is there some kinda sample for this out "here" ? :o) In hope of a sample. It does not have to tollerate execeptions etc. I just need to see the main parts that connects, retreives and stores the file back on my ASP.net or C# project. Anyone???

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  • what is a data serialization system?

    - by Yang
    according to Apache AVRO project, "Avro is a serialization system". By saying data serialization system, does it mean that avro is a product or api? also, I am not quit sure about what a data serialization system is? for now, my understanding is that it is a protocol that defines how data object is passed over the network. Can anyone help explain it in an intuitive way that it is easier for people with limited distributed computing background to understand? Thanks in advance!

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