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• How to make a foreign key connect with sqlite3 and Ruby on Rails

  - by Trip

  Does anyone know the way, or a place where I can find out how to do this? Basically, all I want to do is connect a foreign key between two tables. Is it true, that all I have to do is write the "belongs_to" and "has many" ?

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• Java - get index of key in HashMap?

  - by llm

  In java if I am looping over the keySet() of a HashMap, how do I (inside the loop), get the numerical index of that key? Basically, as I loop through the map, I want to be able to get 0,1,2...I figure this would be cleaner than declaring an int and incrementing with each iteration. Thanks.

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• UNIQUE and PRIMARY KEY

  - by ultrajohn

  Does declaring an attribute of a table as UNIQUE equivalent to declaring it as PRIMARY KEY? tnx a lot!

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• Detect if a key is bound to something in vim

  - by WishCow

  I'd like to know if there is a way to figure out if a key does something in vim. I know that I can use :map to see user-defined mappings, but is there something for the built-in stuff? For example, I always had CTRL-W bound to close tab, because I thought that it was unused. After half a year, I found out that there are some sequences that use it, like CTRL-W CTRL-S to split the window, and it was a nightmare to retrain myself.

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• Android change background of key dynamically

  - by Wouter

  I'm building a custom keyboard in android. My input.xml: <com.mykeyboard.MyKeyboardView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/keyboard" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:keyBackground="@drawable/keybg" /> All the keys do have the same background. Now I'm trying to dynamically change the background of one single key. Is this possible?

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• can I have an abstract base class with the key attribute being generic

  - by Greg

  Hi, I want to create a re-usable library. I was going to use extension methods however I run into some issues in some cases for the client to have to specify in the calling method the types. QUESTION - If I use an abstract base class as the basis, can I specify an attribute/property in the class to be generic (e.g. the key property might be an 'int' in one case, or a 'string' in another)?

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• Detect Shift key at any point during the execution of a console app

  - by adam0101

  I would like to have my console app that runs for a while to give some options to the user at the end if at anytime during the process the user pressed the shift key. Is this possible?

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• How to specifiy key size in the CertCreateSelfSignCertificate function

  - by sako73

  I am using the function CertCreateSelfSignCertificate (http://msdn.microsoft.com/en-us/library/aa376039(VS.85).aspx) to generate a certificate. I need to specify the key size to be 2048. I do not see how to provide this parameter. I would appreciate any help in this matter. Thanks.

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• Python: if key in dict vs. try/except

  - by LeeMobile

  I have a question about idioms and readability, and there seems to be a clash of Python philosophies for this particular case: I want to build dictionary A from dictionary B. If a specific key does not exist in B, then do nothing and continue on. Which way is better? try: A["blah"] = B["blah"] except KeyError: pass or if "blah" in B: A["blah"] = B["blah"] "Do and ask for forgiveness" vs. "simplicity and explicitness". Which is better and why?

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• Need a distributed key-value lookup system in PHP

  - by user198729

  This question asks for one in java, what's the best candidate in PHP? BTW,does the following establish: distributed key value store == distributed cache ?

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• perl - getting a value from a map where the key has a dot

  - by imerez

  I have a map in perl which has been dumped into from some legacy code the name of the key has now changed from simply reqHdrs to reqHdrs.bla $rec->{reqHdrs.bla} My problem is now I cant seem to access this field from the map any ideas ? The following is my error Download Script Output: Bareword "reqHdrs" not allowed while "strict subs" in use

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• [jquery] e.which code for escape key

  - by Shishant

  I have two functions. When enter is pressed the functions runs correctly but when escape is pressed it doesn't. What's the correct number for the escape key? $(document).keypress(function(e) { if (e.which == 13) { $('.save').click(); } // enter (works as expected) if (e.which == 27) { $('.cancel').click(); } // esc (does not work) });

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• Shortcut key to restart server in Eclipse

  - by weesilmania

  So Ctrl/Cmd-F11 starts the server, but is there a key to restart the server? I'm developing using app engine and GWT if that makes any difference (I suspect not).

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• How to represent "ALL" in Primary Key -foreign Key relationship.

  - by Rohit

  I have to create a db design to store blacklisted fax numbers. I have created a table and one column of this table is customerID which is a foreign key to table Customer. Now i want to have a faxnumber which is blacklisted for all customers. How should i proceed with this. Should i use Null in this case. Please provide options

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• Populate a vector with all multimap values with a given key

  - by John

  Given a multimap<A,B> M what's a neat way to create a vector<B> of all values in M with a specific key. e.g given a multimap how can I get a vector of all strings mapped to the value 123? An answer is easy, looping from lower-upper bound, but is there a neat loop-free method?

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• bind key to complete filename wherever the context is in Zsh

  - by lilydjwg

  Sometimes I want a filename instead of what zsh guesses for me. For example, I have a PNG file without a proper .png suffix, which makes zsh think it isn't a picture and won't list it when I type Tab to complete arguments of display. I am wondering if there is a key sequence that completes for a filename wherever the context is, like ^XC for _correct_filename, or how to configure zsh to do the thing?

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• mysql: difference between primary key and unique index?

  - by every_answer_gets_a_point

  i need to change one of the fields of a table to auto increment and to be the primary key. what does unique index mean?

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• disable Opera function key in javascript

  - by DonDon

  I'm writing javascript code for a web emulator containing function keys. The user is able to press keyboard function keys to process something in the emulator, I used stopPropagation and preventDefault javascript function to stop/cancel browsers invoking their function key shortcut (e.g. F1 will invoke Firefox to open its help page) and the code works fine under Firefox and Chrome. But Opera didn't work. I'm using latest Opera 10.5 here. Can anyone help ?

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• SQL java get value assigned to auto increment primary key

  - by iamrohitbanga

  I have a primary key auto increment attribute in my table. I want to know the value assigned to it for a row that is inserted using statement.executeQuery(). How to achieve this in the best possible manner?

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• Open SSL generate Private Key with password from File

  - by Data-Base

  Hello, I have this command openssl genrsa -des3 -out host.key 1024 it asks me for a password, I want to automate it! how I can make it read the password from a text file (host.pass) so it will not ask me or have it ignore the password (which one is better?) Thanks

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• vba: This key is already associated with an element of this collection

  - by I__

  Dim arr As New Collection, a Dim aFirstArray() As Variant ...some code For Each a In aFirstArray arr.Add a, a Next i get this error: This key is already associated with an element of this collection on this line : arr.Add a, a what am i doing wrong?

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• Open x86 'SOFTWARE' registry key on an x64 machine in C#

  - by Lance May

  I am trying to read the 32-bit HKLM\SOFTWARE registry key from a 64-bit (C#) application. This, of course, keeps redirecting my view to HKLM\SOFTWARE\Wow6432Node. According to what I've found this is doable, but I can't seem to find a .NET example anywhere. I just need to read; not write. Anyone ran across this before?

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• Open x64 'SOFTWARE' registry key in C#

  - by Lance May

  I am trying to read the 64-bit HKLM\SOFTWARE registry key from a 32-bit (C#) application. This, of course, keeps redirecting my view to HKLM\SOFTWARE\Wow6432Node. According to what I've found this is doable, but I can't seem to find a .NET example anywhere. I just need to read; not write. Anyone ran across this before?

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• Generate a google map api key and to use in my article

  - by Aruna

  Hi, I am using Joomla 1.5 . how to generate a google map api key and to use in my article?

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• How to loop a key/value object in javascript

  - by Blankman

  var user = {}; now I want to create a setUsers method that takes a key/value pair object and initializes the user variable. setUsers = function(data) { // loop and init user } where data is like: 234: "john", 23421: "smith", ....

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