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• Doubt in action script for Flex: getting unique elements from an ArrayCollection

  - by Nirmal Singh Raja Reegan

  Hi, I have an ArrayCollection as mentioned below. private var initDG:ArrayCollection = new ArrayCollection([ {fact: "Order #2314", appName: "AA"}, {fact: "Order #2315", appName: "BB"} {fact: "Order #2316", appName: "BB"} ... {fact: "Order #2320", appName: "CC"} {fact: "Order #2321", appName: "CC"} ]); I want to populate a ComboBox with UNIQUE VALUES of "appName" field from the ArrayCollection initDG. <mx:ComboBox id="appCombo" dataProvider="{initDG}" labelField="appName"/> One method I could think is to loop through the Array objects and for each object check and push unique appName entries into another Array. Is there any better solution available?

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• Prevent Windows Key from Opening Start Menu in Windows 7

  - by Jeromy Anglim

  I'd like to be able to stop the Windows Key from activating the Start Menu on Windows 7. I don't want to disable the Windows Key completely. I'd like Ctrl + Esc to still open the Start Menu. I know that you can use AutoHotKey to disable the Windows Key completely. The reason I want this functionality is that I have a lot of shortcut keys linked to the Windows key and this often results in accidentally opening the start menu.

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• Unique items in Hibernate collections

  - by Rickard Lindberg

  I have defined a collection in Hibernate like this: ... public class Item { ... @ElementCollection List<Object> relatedObjects; } It creates a mapping table with colums item_id and object_id. The problem is that object_id seems to be unique. In other words I can not have two different items being related to the same object. But that is what I want. I would like the combination of item_id and object_id to be unique. How do I do that?

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• Rails uniqueness constraint and matching db unique index for null column

  - by Dave

  I have the following in my migration file def self.up create_table :payment_agreements do |t| t.boolean :automatic, :default => true, :null => false t.string :payment_trigger_on_order t.references :supplier t.references :seller t.references :product t.timestamps end end I want to ensure that if a product_id is specified it is unique but I also want to allow null so I have the following in my model: validates :product_id, :uniqueness => true, :allow_nil => true Works great but I should then add an index to the migration file add_index :payment_agreements, :product_id, :unique => true Obviously this will throw an exception when two null values are inserted for product_id. I could just simply omit the index in the migration but then there's the chance that I'll get two PaymentAgreements with the same product_id as shown here: Concurrency and integrity My question is what is the best/most common way to deal with this problem

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• Creating a unique key based on file content in python

  - by Cawas

  I got many, many files to be uploaded to the server, and I just want a way to avoid duplicates. Thus, generating a unique and small key value from a big string seemed something that a checksum was intended to do, and hashing seemed like the evolution of that. So I was going to use hash md5 to do this. But then I read somewhere that "MD5 are not meant to be unique keys" and I thought that's really weird. What's the right way of doing this? edit: by the way, I took two sources to get to the following, which is how I'm currently doing it and it's working just fine, with Python 2.5: import hashlib def md5_from_file (fileName, block_size=2**14): md5 = hashlib.md5() f = open(fileName) while True: data = f.read(block_size) if not data: break md5.update(data) f.close() return md5.hexdigest()

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• T-SQL Unique constraint locked the SQL server

  - by PaN1C_Showt1Me

  HI ! This is my table: CREATE TABLE [ORG].[MyTable]( .. [my_column2] UNIQUEIDENTIFIER NOT NULL CONSTRAINT FK_C1 REFERENCES ORG.MyTable2 (my_column2), [my_column3] INT NOT NULL CONSTRAINT FK_C2 REFERENCES ORG.MyTable3 (my_column3) .. ) I've written this constraint to assure that combination my_column2 and my_column3 is always unique. ALTER TABLE [ORG].[MyTable] ADD CONSTRAINT UQ_MyConstraint UNIQUE NONCLUSTERED ( my_column2, my_column3 ) But then suddenly.. The DB stopped responding.. there is a lock or something.. Do you have any idea why? What is bad with the constraint?

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• Unique constraint not created in JPA

  - by homaxto

  I have created the following entity bean, and specified two columns as being unique. Now my problem is that the table is created without the unique constraint, and no errors in the log. Does anyone have an idea? @Entity @Table(name = "cm_blockList", uniqueConstraints = @UniqueConstraint(columnNames = {"terminal", "blockType"})) public class BlockList { @Id @GeneratedValue(strategy = GenerationType.AUTO) private int id; @ManyToOne(cascade = CascadeType.PERSIST) @JoinColumn(name="terminal") private Terminal terminal; @Enumerated(EnumType.STRING) private BlockType blockType; private String regEx; }

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• jQuery: how to pick unique IDs ?

  - by Seerumi

  Hello. New to whole this jQuery (and javascript altogether, heh) and so far it's been excellent, but now I'm in a small pickle. Let's say I have list of forms generated from SQL database and every single one of them has to have unique id, so how I can select the specific item that is to be manipulated (changing values via php). the $("#submit").click(function()) will trigger every submit buttons on the page, so how I can the #submit to be some random id that I clicked. There might be a smarter way, but I'm new to this so try to bear with me. thought of passing the unique value with onClick="myfunction(unique_id)", but don't know how it goes with jQuery. hope this made any sense

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• How to find keycodes for Fn + keys?

  - by budwiser

  I'm trying to find out the keycode for Fn+? keypress (left arrow). Xev outputs FocusOut event, serial 36, synthetic NO, window 0x3c00001,    mode NotifyGrab, detail NotifyAncestor FocusIn event, serial 36, synthetic NO, window 0x3c00001,    mode NotifyUngrab, detail NotifyAncestor KeymapNotify event, serial 36, synthetic NO, window 0x0,    keys:  4294967213 0   0   0   0   0   0   0   0   0   0   0   0   0   0   0              0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   If it is telling me the keycode here, I'm not able to interpret it so help would be appreciated. I'm also curious for finding out if it's possible to bind something to Fn+Del but when trying out this combination, Xev outputs KeyPress event, serial 36, synthetic NO, window 0x3c00001, root 0xad, subw 0x0, time 1984903, (-666,480), root:(53,533), state 0x0, keycode 119 (keysym 0xffff, Delete), same_screen YES, XLookupString gives 1 bytes: (7f) " " XmbLookupString gives 1 bytes: (7f) " " XFilterEvent returns: False KeyRelease event, serial 36, synthetic NO, window 0x3c00001, root 0xad, subw 0x0, time 1985008, (-666,480), root:(53,533), state 0x0, keycode 119 (keysym 0xffff, Delete), same_screen YES, XLookupString gives 1 bytes: (7f) " " XFilterEvent returns: False which is exactly the same as pressing del without Fn. So, summary for short How can I find keycode for Fn+? (left arrow)? Is it even possible to bind something to Fn+Del or am I facing windmills here?

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• How to find keycodes for Fn + keys in Ubuntu 11.10

  - by budwiser

  I'm trying to find out the keycode for Fn+? keypress (left arrow). Xev outputs FocusOut event, serial 36, synthetic NO, window 0x3c00001,    mode NotifyGrab, detail NotifyAncestor FocusIn event, serial 36, synthetic NO, window 0x3c00001,    mode NotifyUngrab, detail NotifyAncestor KeymapNotify event, serial 36, synthetic NO, window 0x0,    keys:  4294967213 0   0   0   0   0   0   0   0   0   0   0   0   0   0   0              0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   If it is telling me the keycode here, I'm not able to interpret it so help would be appreciated. I'm also curious for finding out if it's possible to bind something to Fn+Del but when trying out this combination, Xev outputs KeyPress event, serial 36, synthetic NO, window 0x3c00001, root 0xad, subw 0x0, time 1984903, (-666,480), root:(53,533), state 0x0, keycode 119 (keysym 0xffff, Delete), same_screen YES, XLookupString gives 1 bytes: (7f) " " XmbLookupString gives 1 bytes: (7f) " " XFilterEvent returns: False KeyRelease event, serial 36, synthetic NO, window 0x3c00001, root 0xad, subw 0x0, time 1985008, (-666,480), root:(53,533), state 0x0, keycode 119 (keysym 0xffff, Delete), same_screen YES, XLookupString gives 1 bytes: (7f) " " XFilterEvent returns: False which is exactly the same as pressing del without Fn. So, summary for short How can I find keycode for Fn+? (left arrow)? Is it even possible to bind something to Fn+Del or am I facing windmills here?

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• XSL unique values per node per position

  - by Nathan Colin

  this get ever more complicated :) now i face another issue in last question we managed to take unique values from only one parent node now with: <?xml version="1.0" encoding="ISO-8859-1"?> <roots> <root> <name>first</name> <item> <something>A</something> <something>A</something> </item> <item> <something>B</something> <something>A</something> </item> <item> <something>C</something> <something>P</something> </item> <item> <something>A</something> <something>L</something> </item> <item> <something>A</something> <something>A</something> </item> <item> <something>B</something> <something>A</something> </item> <item> <something>D</something> <something>A</something> </item> </root> <root> <name>second</name> <item> <something>E</something> <something>A</something> </item> <item> <something>B</something> <something>A</something> </item> <item> <something>F</something> <something>A</something> </item> <item> <something>A</something> <something>A</something> </item> <item> <something>A</something> <something>A</something> </item> <item> <something>B</something> <something>H</something> </item> <item> <something>D</something> <something>G</something> </item> </root> </roots> now i need to get the unique values depending only from one node before but just from the elements on the second position <?xml version="1.0" encoding="ISO-8859-1"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output indent="yes" method="text"/> <xsl:key name="item-by-value" match="something" use="concat(normalize-space(.), ' ', generate-id(./ancestor::root))"/> <xsl:key name="rootkey" match="root" use="name"/> <xsl:template match="/"> <xsl:for-each select="key('rootkey','first')"> <xsl:for-each select="item/something[1]"> <xsl:sort /> <xsl:if test="generate-id() = generate-id(key('item-by-value', concat(normalize-space(.), ' ', generate-id(./ancestor::root))))"> <xsl:value-of select="."/> </xsl:if> </xsl:for-each> <xsl:text>_________</xsl:text> <xsl:for-each select="item/something[2]"> <xsl:sort /> <xsl:if test="generate-id() = generate-id(key('item-by-value', concat(normalize-space(.), ' ', generate-id(./ancestor::root))))"> <xsl:value-of select="."/> </xsl:if> </xsl:for-each> </xsl:for-each> </xsl:template> </xsl:stylesheet> with this XSL i get ABCD__LP where the result i need is ABCD__ALP any ideas?

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• How to enable key forwarding with ssh-agent?

  - by Lamnk

  I've used the ssh-agent from oh-my-zsh to manage my SSH key. So far, so good, i only have to type the passphrase for my private key once when I start my shell and public key authentication works great. The problem is however that key forwarding doesn't work. There are 2 servers A & B which I can use public key to login. When I ssh into A then from there ssh into B, I must provide my password, which should not be the case. A is a CentOS 5.6 box, B is an Ubuntu 11.04 box. I have this on my local .ssh/config: Host * ForwardAgent yes OpenSSH on A is standard openssh 4.3 package provided by CentOS. I also enable ForwardAgent for ssh client on A, but forwarding still doesn't work.

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• Importing GPG Key

  - by Bodo

  I have problems importing my GPG-Keys into my new installation of debian. I exportet the private-key a few years ago. Now I am trying to get everything running under a new debian. I tried to do gpg --allow-secret-key-import --import private-key.asc But I only get this: gpg: Keine gültigen OpenPGP-Daten gefunden. gpg: Anzahl insgesamt bearbeiteter Schlüssel: 0 which translates to: gpg: No valid OpenPGP-Data found gpg: Number of processed Keys : 0 The file looks correct and starts with --BEGIN PGP PRIVATE KEY BLOCK----- Version: GnuPG v1.4.9 (GNU/Linux) and ends with -----END PGP PRIVATE KEY BLOCK----- what could be wrong?

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• Problem adding public key for apt

  - by highBandWidth

  I was trying to get the official mongodb for Ubuntu, following the instructions at http://www.mongodb.org/display/DOCS/Ubuntu+and+Debian+packages After adding the deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen line in my sources, I need to add the pgp key since synaptic says W: GPG error: http://downloads-distro.mongodb.org dist Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9ECBEC467F0CEB10 Again following instructions, I did sudo apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10 this says Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver keyserver.ubuntu.com --recv 7F0CEB10 gpg: requesting key 7F0CEB10 from hkp server keyserver.ubuntu.com ?: keyserver.ubuntu.com: Connection refused gpgkeys: HTTP fetch error 7: couldn't connect: Connection refused gpg: no valid OpenPGP data found. gpg: Total number processed: 0 Interestingly, I also get $ apt-key list gpg: fatal: /home/myname/.gnupg: directory does not exist! secmem usage: 0/0 bytes in 0/0 blocks of pool 0/32768 How can I get apt to use this source?

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• public key always asking for password and keyphrase

  - by Andrew Atkinson

  I am trying to SSH from a NAS to a webserver using a public key. NAS user is 'root' and webserver user is 'backup' I have all permissions set correctly and when I debug the SSH connection I get: (last little bit of the debug) debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password debug1: Next authentication method: publickey debug1: Offering DSA public key: /root/.ssh/id_dsa.pub debug1: Server accepts key: pkalg ssh-dss blen 433 debug1: key_parse_private_pem: PEM_read_PrivateKey failed debug1: read PEM private key done: type <unknown> Enter passphrase for key '/root/.ssh/id_dsa.pub': I am using the command: ssh -v -i /root/.ssh/id_dsa.pub [email protected] The fact that it is asking for a passphrase is a good sign surely, but I do not want it to prompt for this or a password (which comes afterwards if I press 'return' on the passphrase)

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• Create private key with CSR

  - by Daniel Schlieckmann

  I have a CSR file (as a text file) and the corresponding P7B certificate. My problem is that I have to create a P12 file on a machine where I do not have created the CSR. I have created the CSR in Firefox Key Manager. Before, I imported the P7B file into certificate store in msc, then exported a CER-file, imported it in Key Manager and then exported the P12 file. This doesn't work anymore because I have another machine now. If I try to import the CER file created by msc, Key Manager says that there is no private key. Is there a possibility to create a private key?

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• Windows 8.1 won't accept my Media Center Pack Product Key

  - by Daniel

  I just installed Windows 8.1 Pro as an upgrade from an ISO torrent. I was able to activate my original Windows 8 key successfully. However, I tried to activate my Media Center Pack key that I purchased for Windows 8 and it errors out the first try. When I try to activate it again, it then says "This key won't work. Check it and try again, or try a different key.". Do I have to purchase the key again? Thanks

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• Force Quit - Short cut key on regular key - mac osx

  - by sagar

  Very confusing question here. I want to use the short cut key of force quit - in mac os x. It is written as follows. Command + Alt / Option + Reverse Q ( like key ). I am unable to use this short cut key. Any help please. Sagar

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• Windows product key is valid but wont activate

  - by pnongrata

  Last month, I needed to install Windows XP (Pro Version 2002 SP3) from a Reinstallation CD a co-worker gave me, and with a product key the IT team told me to use. Everything installed successfully and I have been using the XP machine for the last 30 days without any problems; however it kept reminding me to activate Windows, and of course, I never did (laziness). It now has me locked out of my machine and won't let me log in until I activate it. So I proceed to the Activation Screen which asks me: Do you want to activate Windows now? I choose "Yes, let's activate Windows over the Internet now.", and click the Next button. It now asks me: Do you want to register while you are activating Windows? I choose "No, I don't want to register now; let's just activate Windows.", and click the Next button. I now see the following screen: Notice how the title reads "Unauthorized product key", and how there are only 3 buttons: Telephone Remind me later Retry Please note that the Retry button is disabled until I enter the full product key that IT gave me, then it enables. However, at no point in time do I see a Next button, indicating that the product key was valid/successful. So instead, I just click the Retry button, and the screen refreshes, this time with a different title Incorrect product key Could something be wrong with the Windows XP reinstallation CD (do they "expire" after a certain amount of time, etc.)? Or is this the normal/typical workflow for what happens when you just have a bad product key? I ask because, after this happened I emailed IT and they supplied me whether several other product keys to try. But every time its the same result, same thing happening over again and again. So I guess it's possible that IT has given me several bad keys, but it's more likely something else is going on here. Any thoughts or ways to troubleshoot? Thanks in advance!

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• SSH does not allow the use of a key with group readable permissions

  - by scjr

  I have a development git server that deploys to a live server when the live branch is pushed to. Every user has their own login and therefore the post-receive hook which does the live deployment is run under their own user. Because I don't want to have to maintain the users public keys as authorized keys on the remote live server I have made up a set of keys that 'belong's to the git system to add to remote live servers (In the post-receive hook I am using $GIT_SSH to set the private key with the -i option). My problem is that because of all the users might want to deploy to live, the git system's private key has to be at least group readable and SSH really doesn't like this. Here's a sample of the error: XXXX@XXXX /srv/git/identity % ssh -i id_rsa XXXXX@XXXXX @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: UNPROTECTED PRIVATE KEY FILE! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ Permissions 0640 for 'id_rsa' are too open. It is required that your private key files are NOT accessible by others. This private key will be ignored. bad permissions: ignore key: id_rsa I've looked around expecting to find something in the way of forcing ssh to just go through with the connection but I've found nothing but people blindly saying that you just shouldn't allow access to anything but a single user.

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• Hit one key to hold a second key down, until third is pressed

  - by Core Xii

  I'm trying to get the following behavior with AutoHotKey: When the A key is pressed, AHK holds down the S key until the D key is pressed. The following script isn't working as expected: a:: Send {s Down} return d:: if (GetKeyState("s", "P")) { Send {s Up} } return Neither is the following: a:: release_s = 0 Loop { SendInput, s if release_s break } return d:: release_s = 1 return

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• Numeric Data Entry in WPF

  - by Matt Hamilton

  How are you handling the entry of numeric values in WPF applications? Without a NumericUpDown control, I've been using a TextBox and handling its PreviewKeyDown event with the code below, but it's pretty ugly. Has anyone found a more graceful way to get numeric data from the user without relying on a third-party control?private void NumericEditPreviewKeyDown(object sender, KeyEventArgs e) { bool isNumPadNumeric = (e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9) || e.Key == Key.Decimal; bool isNumeric = (e.Key >= Key.D0 && e.Key <= Key.D9) || e.Key == Key.OemPeriod; if ((isNumeric || isNumPadNumeric) && Keyboard.Modifiers != ModifierKeys.None) { e.Handled = true; return; } bool isControl = ((Keyboard.Modifiers != ModifierKeys.None && Keyboard.Modifiers != ModifierKeys.Shift) || e.Key == Key.Back || e.Key == Key.Delete || e.Key == Key.Insert || e.Key == Key.Down || e.Key == Key.Left || e.Key == Key.Right || e.Key == Key.Up || e.Key == Key.Tab || e.Key == Key.PageDown || e.Key == Key.PageUp || e.Key == Key.Enter || e.Key == Key.Return || e.Key == Key.Escape || e.Key == Key.Home || e.Key == Key.End); e.Handled = !isControl && !isNumeric && !isNumPadNumeric; }

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• Foreign key,local key?

  - by user198729

  CREATE TABLE products ( id integer unsigned auto_increment primary key ) ENGINE=INNODB; CREATE TABLE orders ( id integer PRIMARY KEY auto_increment, product_id integer unsigned, quantity integer, INDEX product_id_idx (product_id), FOREIGN KEY (product_id) REFERENCES products (id) ) ENGINE=INNODB; Here the products and orders obviously have some kind of relation--foreign key relation. Also a coin has two sides,so I'm doubting how do we say which table is the foreign key side or local key side?

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• NULL-keys for key/value table

  - by user72185

  (Using Oracle) I have a table with key/value pairs like this: create table MESSAGE_INDEX ( KEY VARCHAR2(256) not null, VALUE VARCHAR2(4000) not null, MESSAGE_ID NUMBER not null ) I now want to find all the messages where key = 'someKey' and value is 'val1', 'val2' or 'val3' - OR value is null in which case there will be no entry in the table at all. This is to save space; there would be a large number of keys with null values if I stored them all. I think this works: SELECT message_id FROM message_index idx WHERE ((key = 'someKey' AND value IN ('val1', 'val2', 'val3')) OR NOT EXISTS (SELECT 1 FROM message_index WHERE key = 'someKey' AND idx.message_id = message_id)) But is is extremely slow. Takes 8 seconds with 700K records in message_index and there will be many more records and more search criteria when moving outside of my test environment. Primary key is key, value, message_id: add constraint PK_KEY_VALUE primary key (KEY, VALUE, MESSAGE_ID) And I added another index for message_id, to speed up searching for missing keys: create index IDX_MESSAGE_ID on MESSAGE_INDEX (MESSAGE_ID) I will be doing several of these key/value lookups in every search, not just one as shown above. So far I am doing them nested, where output id's of one level is the input to the next. E.g.: SELECT message_id from message_index WHERE (key/value compare) AND message_id IN ( SELECT ... and so on ) What can I do to speed this up?

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• foreign key constraints on primary key columns - issues ?

  - by zzzeek

  What are the pros/cons from a performance/indexing/data management perspective of creating a one-to-one relationship between tables using the primary key on the child as foreign key, versus a pure surrogate primary key on the child? The first approach seems to reduce redundancy and nicely constrains the one-to-one implicitly, while the second approach seems to be favored by DBAs, even though it creates a second index: create table parent ( id integer primary key, data varchar(50) ) create table child ( id integer primary key references parent(id), data varchar(50) ) pure surrogate key: create table parent ( id integer primary key, data varchar(50) ) create table child ( id integer primary key, parent_id integer unique references parent(id), data varchar(50) ) the platforms of interest here are Postgresql, Microsoft SQL Server.

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