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  • True or False: Good design calls for every table to have a primary key, if nothing else, a running i

    - by Velika
    Consider a grocery store scenario (I'm making this up) where you have FACT records that represent a sale transaction, where the columns of the Fact table include SaleItemFact Table ------------------ CustomerID ProductID Price DistributorID DateOfSale Etc Etc Etc Even if there are duplicates in the table when you consider ALL the keys, I would contend that a surrogate running numeric key (i.e. identity column) should be made up, e.g., TransactionNumber of type Integer. I can see someone arguing that a Fact table might not have a unique key (though I'd invent one and waste the 4 bytes, but how about a dimension table?

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  • If-else-if versus map

    - by perezvon
    Hi, Suppose I have such an if/else-if chain: if( x.GetId() == 1 ) { } else if( x.GetId() == 2 ) { } // ... 50 more else if statements What I wonder is, if I keep a map, will it be any better in terms of performance? (assuming keys are integers)

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  • UIView as dictionary key?

    - by subw
    I want to have a NSDictionary that maps from UIViews to something else. However, since UIViews do not implement the NSCopying protocol, I can't use them directly as dictionary keys.

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  • Laravel with Homestead

    - by Ahmed el-Gendy
    I new with virtual box and vagrant , Now I using Homestead image and every thing is run well but when i create my project named laravel on virtual machine it supposed that i see this new folder named laravel on my machine but i didn't get any thing on my machine , The synchronization is not working. NOTE: I'm using ubuntu 14.04 This is my homestead.yaml ip: "192.168.10.10" memory: 2048 cpus: 1 authorize: ~/.ssh/id_rsa.pub keys: - ~/.ssh/id_rsa folders: - map: /var/projects/ to: /home/vagrant/projects/ sites: - map: homestead.app to: /home/vagrant/projects/laravel/public variables: - key: APP_ENV value: local thanks advance

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  • Can DataObjects.NET support SQL identity columns?

    - by Mark
    While there's lots to like about DataObjects.NET, I've found help resources to be a lean, and can't find a solit example of using DataObjects.NET with RDBMS generated primary keys. It would seem as though D4O won't do inserts against SQL Server unless it's in controll of the key. Has anyone solved this in the wild?

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  • Real world examples of tree structures

    - by Arec Barrwin
    I'm looking for some examples of tree structures that are used in commercial/free software projects, modern or old. I can see examples on wikipedia, but I am looking for more concrete examples and how they're used. For example primary keys in databases are (from what I've read) stored in BST structure or a variation of the BST (feel free to correct me on this) My question isn't limited Binary Search Trees (BSTs), it can include any variation such as red-black, AVL and so on.

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  • Retrieve every key of a column family in Cassandra

    - by Matroska
    Hi all, I have found no way to translate a simple select like SELECT * FROM USER into Cassandra. Is it possible to simply retrieve all the keys in a ColumnFamily? The only one I have found is a select with a key range (get_range_slices). Is there a way to not define the key range? Thanks Tobia Loschiavo

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  • RSA key length and export limitations

    - by Alex Stamper
    I know, there are a lot of limitations to the length of used key (import and export limitations for nearly each country). Usually, it varies from 64 to 256 bits. To use more bits, it is obligatory to ask permission from authorities. But it is recommended to use 1024 bits keys for RSA as minimum! Does it mean that I cannot just use RSA without any problems with law and so on?

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  • Emacs, Linux and international keyboard layouts

    - by sabof
    Is there an easy way to use emacs key-bindings when you are using a not-English (Russian) keyboard layout? Whenever an international layout is on, all keystrokes are interpreted literally, M-? instead of M-a. As a result I can't use commands. It would also be nice if Linux could interpret non-prefixed and shift-prefixed keys according according to an international layout, while keeping the rest English.

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  • Safest communication method between applications on same machine

    - by Radu
    What is the safest communication method between two applications on the same machine, both Java and C/C++ clients with a Java server. Are SSL sockets safe enough or they can be broken by "man in the middle" attacks? As i saw in the documentation and code samples, JSSE retrieves private/public keys and certificates from keystore files which a malicious user can see. The only thing that you can hide in the code is the password used to unlock the keystores. Can hackers retrieve that password?

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  • Using RegEx to Identify parts of a Database Connection String

    - by David_Jarrett
    I'm trying to get to grips with regular expressions: I have a database connection string and I'd like to use a regular expression to identify specific Keys and Values within it. For example server=foo;database=bar;uid=foo;pwd=bar I'd like something to return "database=bar;" using the 'database' key to identify it, ideally it would be case insensitive. I can do this using normal code, but I think that this is exactly the sort of thing for which regular expressions were designed.

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  • Urgent help needed on How to update NSMutableDictionary. My code doesn't work.

    - by dawatson833
    I've populated an array using. arrSettings = [[NSMutableArray alloc] initWithContentsOfFile:[self settingsPath]]; The file is a plist with the root as an array and then a dictionary with three three keys defined as number. I've also tried setting the keys to string. I display the values in the plist file on a view using. diaper = [[arrSettings objectAtIndex:0] objectForKey:@"Diaper Expenses"]; oil = [[arrSettings objectAtIndex:0] objectForKey:@"Oil Used"]; tree = [[arrSettings objectAtIndex:0] objectForKey:@"Wood Used"]; This code works fine, the values in the dictionary are assigned to the variables and they are displayed. The user can make changes and then press a save button. I use this code to extract the dictionary part of the array so I can update it. The assignment to editDictionary works. I've double checked the key names including case and that is correct. editDictionary = [[NSMutableDictionary alloc] init]; editDictionary = [arrSettings objectAtIndex:0]; NSNumber *myNumber = [NSNumber numberWithFloat:diaperAmount]; [editDictionary setValue:myNumber forKey:@"Diaper Expenses"]; myNumber = [NSNumber numberWithFloat:oilAmount]; [editDictionary setValue:myNumber forKey:@"Oil Used"]; myNumber = [NSNumber numberWithFloat:treeAmount]; [editDictionary setValue:myNumber forKey:@"Wood Used"]; In this example I've used a nsnumber. But I've also tried the xxxAmount field as part of SetValue instead of creating a NSNumber. Neither implementation works. Several strange things happen. Sometimes the first two setvalue statements work, but the last setvalue fails with a EXC_BAD_ACCESS failure. Other times the first setValue fails with the same error. I have no idea why the first two sometimes work. I'm at a loss of what to do next. I've tried several implentations and none of them work. Also, in the debugger how can I display the editDictionary elements. I can see editDictionary, but I don't know how to display the individual elements.

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  • Could not install appliation via Desktop Manager..

    - by tek3
    I am trying to install an application onto my device..I have compiled the application using JDK 4.5.0 and also signed it with RIM signing keys...But i am unable to install my application onto my device(8900) through desktop manager..It keeps on showing "application is not compatible with your device and cannot be loaded"... Since i have compiled my application in JDK 4.5, it must be compatible with all devices having OS 4.5.0...Any pointers to what might be going wrong??? Is there any version miss match??

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  • a console code editor with CUA (ctrl-x ctrl-v ...) key bindings (unlike vi)

    - by clyfe
    I'm searching for a console code editor with CUA key bindings (ctrl-x c v etc.) Right now i'm toying mcedit but i don't really like it. My desired features are: * be fast * CUA key bindings (ctrl-x c v etc.) * toggle show line numbers * find/replace/goto line * bind custom keys to action( ctrl-shift-arrowdown to double the curent line etc.) * nice simple vi-like interface (no pointless menus) * be able to programatically extend it ... etc.

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  • How do i get the reg string from the handle integer?

    - by Tom
    Hi, ive got the reg handles (as ints) being outputted, but i need to convert this to the HKLM/bla/bla.... I know that the 5 Root Keys are 0x80000000Y where Y is a value from 0 to 4, but i'm also getting much smaller values which represent nodes lower down in the registry leaves.

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  • python destructuring-bind dictionary contents

    - by Stephen
    Hi, I am trying to 'destructure' a dictionary and associate values with variables names after its keys. Something like params = {'a':1,'b':2} a,b = params.values() but since dictionaries are not ordered, there is no guarantee that params.values() will return values in the order of (a,b). Is there a nice way to do this? Thanks

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  • IE8 Session sharing across tabs and windows

    - by Clint
    Has anyone implemented any effective solutions to address the numerous issues that are caused by IE8's session sharing functionality? We've gotten very close by writing a custom http module that compares session and view state values, but our efforts are thwarted by things such as accelerator keys and unaccceptable copying of session objects. This is a VB.Net web app.

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  • Detecting Enter KeyPress on VB.NET 2008

    - by Tareq
    I am using 3.5 framework of VB.NET 2008. I have some textboxes in my form. I want the tab like behavior when my user presses ENTER on one of my textboxes. I used the following Code: Private Sub txtDiscount_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtDiscount.KeyPress If e.KeyChar = Microsoft.VisualBasic.ChrW(Keys.Return) Then SendKeys.Send("{TAB}") e.Handled = True End If End Sub But It doen't work for me. Please give me a solution.

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  • can this simple SQL query be optimized?

    - by ibiza
    Hi, I have the following query : SELECT COUNT(*) FROM Address adr INNER JOIN Auditable a on adr.UniqueId = a.UniqueId on a big DB (1.3M adresses, 4M+ auditables) both UniqueId columns are clustered primary keys the query is taking quite long to complete...I feel dumb, but is there any way to optimize it? I want to count all the address entries that have an underlying auditable... thanks!

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