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• Storing callbacks in a dictionary (Objective C for the iPhone)

  - by Casebash

  I am trying to store callbacks in a dictionary. I can't use blocks as the iPhone doesn't support this (unless you use plblocks). I tried using functions, but apparently NSMutableDictionary doesn't allow these pointers (wants an id) I tried using class methods, but I couldn't find a way to obtain a pointer to these I could try using functions with the c++ stl hashmap (if it is supported in Objective C++), but apparently this can slow compilation times. I could try storing both a class and a selector, but that seems rather messy. What would be the best way to do this?

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• Storing a large list in isolatedStorage on WP7

  - by Ra

  I'm storing a List with around 3,000 objects in Isolatedstorage using Xml serialize. It takes too long to deserialize this and I was wondering if you have any recommendations to speed it up. The time is tolerable to deserialize up to 500 objects, but takes forever to deserialize 3000. Does it take longer just on the emulator and will be faster on the phone? I did a whole bunch of searching and some article said to use a binary stream reader, but I can't find it. Whether I store in binary or xml doesn't matter, I just want to persist the List. I don't want to look at asynchronous loading just yet...

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• Storing data to SequenceFile from Apache Pig

  - by asquithea

  Apache Pig can load data from Hadoop sequence files using the PiggyBank SequenceFileLoader: REGISTER /home/hadoop/pig/contrib/piggybank/java/piggybank.jar; DEFINE SequenceFileLoader org.apache.pig.piggybank.storage.SequenceFileLoader(); log = LOAD '/data/logs' USING SequenceFileLoader AS (...) Is there also a library out there that would allow writing to Hadoop sequence files from Pig?

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• Best practice for storing global data in PHP?

  - by user281434

  Hi I'm running a web application that allows a user to log in. The user can add/remove content to his/her 'library' which is displayed on a page called "library.php". Instead of querying the database for the contents of the users library everytime they load "library.php", I want to store it globally for PHP when the user logs in, so that the query is only run once. Is there a best practice for doing this? fx. storing their library in an array in a session? Thanks for your time

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• Rails 2.3 - Storing sessions in different schema

  - by sa125

  Hi - I want to config my app to use a different schema than the default for storing sessions. Basically, I want the app to store all its active_record objects in app_development and only its sessions in app_sessions. Normally this could be done by defining the sessions db in database.yml: development: # ... sessions: host: localhost database: app_sessions username: blah password: sssshhh #.... And then setting in the model: class Session < ActiveRecord::Base establish_connection :sessions #... end But since session doesn't have a model class defined, I'm looking for a way to tell it where to store its data. I've noticed the session comes from ActionController::Session, but couldn't find what I needed there. Any thoughts? thanks.

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• Securely Storing Optional Entropy While Using DPAPI

  - by Changeling

  So I am trying to store the symmetric key using DPAPI. All is well and great, but what to do with the entropy? This answered question here really doesn't provide enough insight. It seems like a slippery slope - I could use the machine store to store the entropy but then what prevents someone from getting at that as well? Note: I am storing the current key using the User Scope. So my question is - what is the best way to store the entropy using DPAPI?

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• Checking for & storing multiple CheckBox selections in CSharp.

  - by Matt

  I'm very new to CSharp and I can't seem to find a good solution to what I would consider a simple problem. Basically I'm trying to determine which CheckBoxs have been selected by the user and then randomly generate combinations of the selections the user has made. As new as I am, I am aware that you can use a simple statement such as: checkBox1.IsChecked == true I could have a long set of if statements which update an array/collection, but I'm told that in Csharp there is a way of determining which CheckBoxs are checked by querying the GroupBox that the CheckBoxs are in. Unless I'm mistaken (which is very possible) this is achieved by using Control features, unfortunately I've not come across these yet in my learning so if someone could clear things up that would be great. In summation, if someone has a simple solution for running through a set of checkBoxs and storing only the selected ones I would be most grateful.

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• Storing varchar(max) & varbinary(max) together - Problem?

  - by Tony Basallo

  I have an app that will have entries of both varchar(max) and varbinary(max) data types. I was considering putting these both in a separate table, together, even if only one of the two will be used at any given time. The question is whether storing them together has any impact on performance. Considering that they are stored in the heap, I'm thinking that having them together will not be a problem. However, the varchar(max) column will be probably have the text in row table option set. I couldn't find any performance testing or profiling while "googling bing," probably too specific a question? The SQL Server 2008 table looks like this: Id ParentId Version VersionDate StringContent - varchar(max) BinaryContent - varbinary(max) The app will decide which of the two columns to select for when the data is queried. The string column will much used much more frequently than the binary column - will this have any impact on performance?

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• Storing a SHA512 Password Hash in Database

  - by Chris

  In my ASP.NET web app I'm hashing my user passwords with SHA512. Despite much SO'ing and Googling I'm unclear how I should be storing them in the database (SQL2005) - the code below shows the basics of how I'm creating the hash as a string and I'm currently inserting it into the database into a Char(88) column as that seems to be the length created consistently Is holding it as a String the best way to do it, if so will it always be 88 chars on a SHA512 (as I have seen some bizarre stuff on Google)? Dim byteInput As Byte() = Encoding.UTF8.GetBytes(sSalt & sInput) Dim hash As HashAlgorithm = New SHA512Managed() Dim sInsertToDatabase As String = Convert.ToBase64String(hash.ComputeHash(byteInput))

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• Storing entity in XML, using MVVM to read/write in WPF Application

  - by Christian

  Say I've a class (model) called Instance with Properties DatbaseHostname, AccessManagerHostname, DatabaseUsername and DatabasePassword public class Instance { private string _DatabaseHostname; public string DatabaseHostname { get { return _DatabaseHostname; } set { _DatabaseHostname = value; } } private string _AccessManagerHostname; public string AccessManagerHostname { get { return _AccessManagerHostname; } set { _AccessManagerHostname = value; } } private string _DatabaseUsername; public string DatabaseUsername { get { return _DatabaseUsername; } set { _DatabaseUsername = value; } } private string _DatabasePassword; public string DatabasePassword { get { return _DatabasePassword; } set { _DatabasePassword = value; } } } I'm looking for a sample code to read/write this Model to XML (preferably linq2XML) = storing 1:n instances in XML. i can manage the the view and ViewModel part myself, although it would be nice if someone had a sample of that part too..

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• Storing Configurations into Active Direcotry Application Mode

  - by Khurram Aziz

  I have a network devices polling and do actions kind of app; currently it keeps the configuration (which devices to poll, what kind of device, ip, login, password etc) in the database. My network administrator wants that this information is stored in some LDAP server so that he maintain single store of configuration which he himself can use in other apps/scripts etc. I am looking for some article that walks me through setting up ADAM/AD LDS for storing configuration by authoring custom schema etc and how to setup some authentication infrastructure to protect the data.

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• Storing ASP.Net MVC Views in the Database

  - by Adam Albrecht

  For an ASP.Net MVC application, I'm interested in storing some views and/or partial views in the database so that a few semi-technical users can do some basic view logic. Does anyone have any tips or lessons from experience on doing this? I know Phil Haack wrote a blog post on this about a year ago. He used IronRuby for scripting his views, (which would be fine for me). He created a quick proof-of-concept, but I can't find any other information on the topic. Any ideas, thoughts, tips, etc would be appreciated. Thanks!

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• how to make data that download from google-app-engine readable..

  - by zjm1126

  i use this to download all data from my google app: i follow this article: http://code.google.com/intl/en/appengine/docs/python/tools/uploadingdata.html#Creating_Exporter_Classes and download data use this: bulkloader.py --dump --url=http://zjm1126.appspot.com/remote_api --filename=b.csv but the data is : so how to make the data readable ? thanks

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• Pros and cons of ways of storing an unsigned int without an unsigned int data type

  - by fields

  I have values that are 64-bit unsigned ints, and I need to store them in mongodb, which has no unsigned int type. I see three main possibilities for storing them in other field types, and converting on going in and out: Using a signed int is probably easiest and most space efficient, but has the disadvantage that they're not human readable and if someone forgets to do the conversion, some of them will work, which may obscure errors. Raw binary is probably most difficult for inexperienced programmers to deal with, and also suffers from non-human-readability. A string representation is the least space efficient (~40 bytes in unicode vs 8 bytes per field), but then at least all of the possible values will map properly, and for querying only a conversion to string is required instead of a more complicated conversion. I need these values to be available from different platforms, so a single driver-specific solution isn't an option. Any major pros and cons I've missed? Which one would you use?

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• Storing expression references to data base

  - by Marcus

  I have standard arithmetic expressions sotred as strings eg. "WIDTH * 2 + HEIGHT * 2" In this example WIDTH and HEIGHT references other objects in my system and the literals WIDTH and HEIGHT refers to a property (Name) on those objects. The problem I'm having is when the Name property on an expression object changes the expression won't match anymore. One solution I came up with is to instead of storing "WIDTH * 2 + HEIGHT * 2" i store "{ID_OF_WIDTH} * 2 + {ID_OF_HEIGHT} * 2" And let my parser be able to parse this new syntax and implement an interface or such on referenced objects IExpressionReference { string IdentifierName { get; } } Anyone have a better/alternative solution to my problem?

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• Storing a value in Memory Independent of Process

  - by Ganesh

  Hi, I need a way to store a value somewhere for temporarily by say Process A. Process A can exit the after storing the value in memory. After sometime Process B comes accesses the same location of memory and read the value. I need to store in memory, because I dont want the data to persistent across reboots. But as long as the system is up, it Independent of the Process the data must be accessible. I tried MailSlots and Temporary files in windows, both seem to have problem where the process reference count drops to zero , the entities dont persist in memory. What is a suitable mechanism for this in Windows preferably using Win32 API? Ganesh

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• Storing a list of objects in GAE

  - by Dominic Bou-Samra

  I need to store some data that looks a little like this: xyz 123 abc 456 hij 678 rer 838 Now I would just store it as a traditional string and integer model, and put in the datastore. But the data changes regularly, and is ONLY relevant when looked at as a COLLECTION. So it needs to be store as either a list of lists, or a list of objects, both of which can't really be done without pickling as far as I know. Can anyone help? Even storing it as a text file may work :S

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• Storing multiple checkbox values in database

  - by Madjokr

  Hi, I want to store multiple column values in table.Lets take a example .. What are your favourite colors? the choices can be red,blue,green, orange. So lets assume, the user selects atleast 2 values. Is there any way to store the multiple values in table. I have implemented by concatinating choices of users in a column in the table. I later found that it is a bad practise. Currently i can think of using Bitwise operator and habtm. What are the different ways for storing multiple choices values in table? If I am implementing in rails, What is the best way to implement this with OOP concepts? Is there any builtin options in rails?

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• DataType for storing a long serial number (10 bytes)

  - by CrimsonX

  We have a device which has a 10 byte serial number which must be read into our application and stored into a .net datatype. In the device it is stored as an unsigned 10-byte (80-bit) number. I don't expect we will be performing any mathematical operations on this number, but only displaying it to the user. The .NET framework doesn't have a built in UNIT128 to store this datatype. My suggestion for storing this datatype is to create a 10 element byte array and read in the data into this array. Are there any better solutions to this problem? Note: I have seen in this question that a GUID is a 128 byte signed integer, but it seems like a bad idea to use a GUID in this fashion. Any other suggestions?

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• Storing n-grams in database in < n number of tables.

  - by kurige

  If I was writing a piece of software that attempted to predict what word a user was going to type next using the two previous words the user had typed, I would create two tables. Like so: == 1-gram table == Token | NextWord | Frequency ------+----------+----------- "I" | "like" | 15 "I" | "hate" | 20 == 2-gram table == Token | NextWord | Frequency ---------+------------+----------- "I like" | "apples" | 8 "I like" | "tomatoes" | 12 "I hate" | "tomatoes" | 20 "I hate" | "apples" | 2 Following this example implimentation the user types "I" and the software, using the above database, predicts that the next word the user is going to type is "hate". If the user does type "hate" then the software will then predict that the next word the user is going to type is "tomatoes". However, this implimentation would require a table for each additional n-gram that I choose to take into account. If I decided that I wanted to take the 5 or 6 preceding words into account when predicting the next word, then I would need 5-6 tables, and an exponentially increase in space per n-gram. What would be the best way to represent this in only one or two tables, that has no upper-limit on the number of n-grams I can support?

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• Specifying column names from a list in the data.frame command.

  - by MW Frost

  I have a list called cols with column names in it: cols <- c('Column1','Column2','Column3') I'd like to reproduce this command, but with a call to the list: data.frame(Column1=rnorm(10)) Here's what happens when I try it: > data.frame(cols[1]=rnorm(10)) Error: unexpected '=' in "data.frame(I(cols[1])=" The same thing happens if I wrap cols[1] in I() or eval(). How can I feed that item from the vector into the data.frame() command?

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• Storring data in web.config(custom section/appSettings element) vs storing it in a class

  - by rubysons

  Hi. Why is it better to store data inside an appSettings element (or inside a custom section) of a web.config file than to store it in a class? One argument would be that by using custom sections we don’t have to recompile code when we change data, but that’s a weak argument, especially if we’re using Web Sites, which get recompiled automatically whenever code changes! Thank you

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• Storing CLLocationCoordinates2D in NSMutableArray

  - by Amarsh

  After some searching, I got the following solution : ref: http://stackoverflow.com/questions/1392909/nsmutablearray-addobject-with-mallocd-struct CLLocationCoordinate2D* new_coordinate = malloc(sizeof(CLLocationCoordinate2D)); new_coordinate->latitude = latitude; new_coordinate->longitude = longitude; [points addObject:[NSData dataWithBytes:(void *)new_coordinate length:sizeof(CLLocationCoordinate2D)]]; free(new_coordinate); And access it as: CLLocationCoordinate2D* c = (CLLocationCoordinate2D*) [[points objectAtIndex:0] bytes]; However, someone claims that there is a memory leak here? Can anyone suggest me where is the leak and how to fix it. Further, is there a better way of storing a list of CLLocationCoordinate2D in NSMutableArray? Please give sample code since I am an Objective C newbie.

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• storing large data in string

  - by Sathish

  i am trying to store large data more than 255 characters in a string datatype but it truncates after 255. how can i achive this basically i need to pass this data to database

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• Storing Instances of Classes in Flex Shared Objects

  - by babyangel86

  Is it possible to store instances of a class in a cookie or in shared objects. Basically in my application I have an object "Diagram" that the user can create. If they hit save, I want to store the current instance as a cookie and allows them to reload it later. Alternatively, I could see about getting them to store the saved version on the hard disk. But even then, all I want to save and retreive is my actionscript object. Is this possible? I've tried storing the object to SharedObject.data.diag, but when I try to retrieve the object from the cookie doing SharedObject.data.diag as Diag returns null.

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