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  • Unique identifiers for users

    - by Christopher McCann
    If I have a table of a hundred users normally I would just set up an auto-increment userID column as the primary key. But if suddenly we have a million users or 5 million users then that becomes really difficult because I would want to start becoming more distributed in which case an auto-increment primary key would be useless as each node would be creating the same primary keys. Is the solution to this to use natural primary keys? I am having a real hard time thinking of a natural primary key for this bunch of users. The problem is they are all young people so they do not have national insurance numbers or any other unique identifier I can think of. I could create a multi-column primary key but there is still a chance, however miniscule of duplicates occurring. Does anyone know of a solution? Thanks

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  • Hibernate not saving foreign key, but with junit it's ok

    - by Leonardo
    Hi All, I have this strange problem. In a J2ee webapp with spring, smartgwt and hibernate, it happens that I have a class A wich has a set of class B, both of them mapped to table A and table B. I wrote a simple test case for testing the service manager which is supposed to do insert, update, delete and everything work as expected especially during insert. In the end I have one record in A and records in B with foreign key to A. But when I try to call the service from the web app, the entity in B are saved without a foreign key reference. I am sure that the service is the same. One thing I noticed is that enabling hibernate logging, seems that when the service is called from the application, one more update is made: insert A insert B update A update B update B (foreign key only) update A <--- ??? update B <--- ??? Instead, when junit test case is run, the update is as follows: insert A insert B update A update B update B (foreign key only) I suppose the latest update is what is causing the erroe, maybe it is overwriting values. Considering that the app is using spring, with the well known mechanism of DAO + Manager, where can I investigate to solve this issue ? Someone told me that the session is not closed, so hibernate would do one more update before release the objects by itself. I am pretty sure that all the configuration hbm, xml, and the rest are fine...but I maybe wrong. thanks

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  • Encrypt string with public key only

    - by vlahovic
    i'm currently working on a android project where i need to encrypt a string using 128 bit AES, padding PKCS7 and CBC. I don't want to use any salt for this. I've tried loads of different variations including PBEKey but i can't come up with working code. This is what i currently have: String plainText = "24124124123"; String pwd = "BobsPublicPassword"; byte[] key = pwd.getBytes(); key = cutArray(key, 16); byte[] input = plainText.getBytes(); byte[] output = null; SecretKeySpec keySpec = null; keySpec = new SecretKeySpec(key, "AES"); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding"); cipher.init(Cipher.ENCRYPT_MODE, keySpec); output = cipher.doFinal(input); private static byte[] cutArray(byte[] arr, int length){ byte[] resultArr = new byte[length]; for(int i = 0; i < length; i++ ){ resultArr[i] = arr[i]; } return resultArr; } Any help appreciated //Vlahovic

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  • How can I make Access think there is a primary key

    - by user3692757
    I have a table and I'm trying to join it with another table, but it doesn't have a distinctive primary key. The two tables do share similarities, “Acct” and “Location”. If I could concatenate “Acct&Location” it would become a primary key, but Access won’t let me make a primary key from a calculation. I provided a small sample below. Each hospital has an “Acct”, but the “Acct” will show up once for each “Location”. How can I make join these in a relationship? I connected the two in a relationships and tried to “Enforce Referential Integrity”, but it indicated “No unique index found for the referenced field of the primary key”. Also, if I run a “Find UnMatched Query” it doesn’t find anything. I think its because I can’t make it realize that in combination “Acct” and “Location” can be perceived as primary keys when used in conjunction of each other. Acct 1 2 3 1 2 3 1 2 3| Location ABI ABI ABI NHO NHO NHO NTX NTX NTX I tried to load an image to illustrate it better, but I haven't made enough post.

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  • Tip #19 Module Private Visibility in OSGi

    - by ByronNevins
    I hate public and protected methods and classes.  It requires so much work to change them in a huge project like GlassFish.  Not to mention that you may well have to support those APIs forever.  They are highly overused in GlassFish.  In fact I'd bet that > 95% of classes are marked as public for no good reason.  It's just (bad) habit is my guess. private and default visibility (I call it package-private) is easier to maintain.  It is much much easier to change such classes and methods around.  If you have ANY public method or public class in GlassFish you'll need to grep through a tremendous amount of source code to find all callers.  But even that won't be theoretically reliable.  What if a caller is using reflection to access public methods?  You may never find such usages. If you have package private methods, it's easy.  Simply grep through all the code in that one package.  As long as that package compiles ok you're all set.  There can' be any compile errors anywhere else.  It's a waste of time to even look around or build the "outside" world.  So you may be thinking: "Aha!  I'll just make my module have one giant package with all the java files.  Then I can use the default visibility and maintenance will be much easier.  But there's a problem.  You are wasting a very nice feature of java -- organizing code into separate packages.  It also makes the code much more encapsulated.  Unfortunately to share code between the packages you have no choice but to declare public visibility. What happens in practice is that a module ends up having tons of public classes and methods that are used exclusively inside the module.  Which finally brings me to the point of this blog:  If Only There Was A Module-Private Visibility Available Well, surprise!  There is such a mechanism.  If your project is running under OSGi that is.  Like GlassFish does!  With this mechanism you can easily add another level of visibility by telling OSGi exactly which public you want to be exposed outside of the module.  You get the best of both worlds: Better encapsulation of your code so that maintenance is easier and productivity is increased. Usage of public visibility inside the module so that you can encapsulate intra-module better with packages. How I do this in GlassFish: Carefully plan out at least one package that will contain "true" publics.  This is the package that will be exported by OSGi.  I recommend just one package. Here is how to tell OSGi to use it in GlassFish -- edit osgi.bundle like so:-exportcontents:     org.glassfish.mymodule.truepublics;  version=${project.osgi.version} Now all publics declared in any other packages will be visible module-wide but not outside the module. There is one caveat: Accessing "module-private" items outside of the module is controlled at run-time, not compile-time.  The compiler has no clue that a public in a dependent module isn't really public.  it will happily compile it.  At runtime you will definitely see fireworks.  The good news is that you don't have to wait for the code path that tries to use the "module-private" items to fire.  OSGi will complain loudly when that module gets loaded.  OSGi will refuse to load it.  You will see an error like this: remote failure: Error while loading FOO: Exception while adding the new configuration : Error occurred during deployment: Exception while loading the app : org.osgi.framework.BundleException: Unresolved constraint in bundle com.oracle.glassfish.miscreant.code [115]: Unable to resolve 115.0: missing requirement [115.0] osgi.wiring.package; (osgi.wiring.package=org.glassfish.mymodule.unexported). Please see server.log for more details. That is if you accidentally change code in module B to use a public that is really a "module-private" in module A, then you will see the error immediately when you try to test whatever you were changing in module B.

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  • Mystery Key Value Coding Key

    - by Stephen Furlani
    Hello, I'm attempting to load data from an undocumented API (OsiriX). Getting the NSManagedObject like this: NSManagedObject *itemStudy = [[BrowserController databaseOutline] itemAtRow: [[BrowserController databaseOutline] selectedRow]]; works just fine. But getting the NSManagedObject like this: seriesArray = [_context executeFetchRequest:request error:&error]; NSManagedObject *itemSeries = [seriesArray objectAtIndex:0]; Generates an error when I call [itemSeries valueForKey:@"type"] 2010-05-27 11:04:48.178 rcOsirix[27712:7b03] Exception: [<NSManagedObject 0xd30fd0> valueForUndefinedKey:]: the entity Series is not key value coding-compliant for the key "type". This confuses me thoroughly. If I print the KVC values for itemSeries I get this list: 2010-05-27 11:04:48.167 rcOsirix[27712:7b03] KVC comment 2010-05-27 11:04:48.168 rcOsirix[27712:7b03] KVC date 2010-05-27 11:04:48.168 rcOsirix[27712:7b03] KVC dateAdded 2010-05-27 11:04:48.169 rcOsirix[27712:7b03] KVC dateOpened 2010-05-27 11:04:48.169 rcOsirix[27712:7b03] KVC displayStyle 2010-05-27 11:04:48.170 rcOsirix[27712:7b03] KVC id 2010-05-27 11:04:48.170 rcOsirix[27712:7b03] KVC modality 2010-05-27 11:04:48.170 rcOsirix[27712:7b03] KVC name 2010-05-27 11:04:48.171 rcOsirix[27712:7b03] KVC numberOfImages 2010-05-27 11:04:48.171 rcOsirix[27712:7b03] KVC numberOfKeyImages 2010-05-27 11:04:48.171 rcOsirix[27712:7b03] KVC rotationAngle 2010-05-27 11:04:48.172 rcOsirix[27712:7b03] KVC scale 2010-05-27 11:04:48.172 rcOsirix[27712:7b03] KVC seriesDICOMUID 2010-05-27 11:04:48.173 rcOsirix[27712:7b03] KVC seriesDescription 2010-05-27 11:04:48.173 rcOsirix[27712:7b03] KVC seriesInstanceUID 2010-05-27 11:04:48.173 rcOsirix[27712:7b03] KVC seriesSOPClassUID 2010-05-27 11:04:48.174 rcOsirix[27712:7b03] KVC stateText 2010-05-27 11:04:48.174 rcOsirix[27712:7b03] KVC thumbnail 2010-05-27 11:04:48.174 rcOsirix[27712:7b03] KVC windowLevel 2010-05-27 11:04:48.175 rcOsirix[27712:7b03] KVC windowWidth 2010-05-27 11:04:48.175 rcOsirix[27712:7b03] KVC xFlipped 2010-05-27 11:04:48.176 rcOsirix[27712:7b03] KVC xOffset 2010-05-27 11:04:48.176 rcOsirix[27712:7b03] KVC yFlipped 2010-05-27 11:04:48.176 rcOsirix[27712:7b03] KVC yOffset 2010-05-27 11:04:48.177 rcOsirix[27712:7b03] KVC mountedVolume 2010-05-27 11:04:48.177 rcOsirix[27712:7b03] KVC study 2010-05-27 11:04:48.178 rcOsirix[27712:7b03] KVC images The KVC for itemStudy is this: 2010-05-27 10:46:40.336 OsiriX[27266:a0f] KVC accessionNumber 2010-05-27 10:46:40.336 OsiriX[27266:a0f] KVC comment 2010-05-27 10:46:40.336 OsiriX[27266:a0f] KVC date 2010-05-27 10:46:40.336 OsiriX[27266:a0f] KVC dateAdded 2010-05-27 10:46:40.336 OsiriX[27266:a0f] KVC dateOfBirth 2010-05-27 10:46:40.336 OsiriX[27266:a0f] KVC dateOpened 2010-05-27 10:46:40.337 OsiriX[27266:a0f] KVC dictateURL 2010-05-27 10:46:40.337 OsiriX[27266:a0f] KVC expanded 2010-05-27 10:46:40.337 OsiriX[27266:a0f] KVC hasDICOM 2010-05-27 10:46:40.337 OsiriX[27266:a0f] KVC id 2010-05-27 10:46:40.337 OsiriX[27266:a0f] KVC institutionName 2010-05-27 10:46:40.337 OsiriX[27266:a0f] KVC lockedStudy 2010-05-27 10:46:40.337 OsiriX[27266:a0f] KVC modality 2010-05-27 10:46:40.338 OsiriX[27266:a0f] KVC name 2010-05-27 10:46:40.338 OsiriX[27266:a0f] KVC numberOfImages 2010-05-27 10:46:40.338 OsiriX[27266:a0f] KVC patientID 2010-05-27 10:46:40.338 OsiriX[27266:a0f] KVC patientSex 2010-05-27 10:46:40.338 OsiriX[27266:a0f] KVC patientUID 2010-05-27 10:46:40.338 OsiriX[27266:a0f] KVC performingPhysician 2010-05-27 10:46:40.339 OsiriX[27266:a0f] KVC referringPhysician 2010-05-27 10:46:40.339 OsiriX[27266:a0f] KVC reportURL 2010-05-27 10:46:40.339 OsiriX[27266:a0f] KVC stateText 2010-05-27 10:46:40.339 OsiriX[27266:a0f] KVC studyInstanceUID 2010-05-27 10:46:40.339 OsiriX[27266:a0f] KVC studyName 2010-05-27 10:46:40.339 OsiriX[27266:a0f] KVC windowsState 2010-05-27 10:46:40.339 OsiriX[27266:a0f] KVC albums 2010-05-27 10:46:40.340 OsiriX[27266:a0f] KVC series If I use code: NSDictionary *props = [[item entity] propertiesByName]; for (NSString *s in [props allKeys]) { NSLog(@"KVC %@", s); } Yet itemStudy throws no error if I call [itemStudy valueForKey:@"type"] when it should because there's no KVC for @"type"!!! Granted, the objects are different but neither of them contain the key @"type" and they both should throw errors, yet the Osirix code Tests for both conditions: if ([[item valueForKey:@"type"] isEqualToString:@"Series"]) { ... } if ([[item valueForKey:@"type"] isEqualToString:@"Study"]) { ... } And throws no errors. Yet when I load an NSManagedObject of the same exact model and entity @"Series" it throws the 'no key value' when passed into the conditions above. Am I missing something? Both the superentity and subentities of itemSeries and itemStudy are nil so they don't inherit from something that has KVC @"type". I'm totally at a loss as to explain what is going on. --- EDIT --- I know no one can explain what is going on... but maybe where to start looking? How would itemStudy have the extra KVC @"type" that doesn't show up in it's property list? Thank you for your assistance, -Stephen

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  • Need sample program

    - by sharun
    Hi i generated private key(myrsaskey.pem) and kept the file in my local system. And i upload this file in google app application. Now i need a sample program which use Authsub, HMAC-SHA1,and this private key using Java. Please Help me. Regards Sharun.

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  • capture flash key event "escape"

    - by P..
    I have a flash site that users can view full Screen video. the trouble is, I am making only the video player full screen (hiding the rest of the site behind it). my "toggle full screen" button works in that it reduces the video player back to normal size when the user toggles out of full screen back. but when the user hits the escape key, my flash script doesn't know that the video player should be reduced in size. it seems there's no way to capture the ESCAPE key as a key event. any ideas?

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  • How to read public key from PFX file in java

    - by articlestack
    I am able to read private key from PFX file but not public key. I am using following code to read public key. InputStream inStream = new FileInputStream(certFile); CertificateFactory cf = CertificateFactory.getInstance("X.509"); BufferedInputStream bis = new BufferedInputStream(inStream); // if (bis.available() > 0) { java.security.cert.Certificate cert = cf.generateCertificate(bis); System.out.println("This part is not getting printed in case of PFX file"); // } puk = (PublicKey) cert.getPublicKey(); This code is working properly when i read from .cer file. Please help

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  • MYSQL KEY-VALUE PAIR Viability

    - by Amit
    Hi, I am new to mysql and I am looking for some answers to the follwoing questions: a) Can mysql community server can be leveraged for a key-value pair type database.?? b) Which mysql engine is best suited for a key-value pair type database ?? c) Is Mysql cluster a must for horizontal scaling of key-value based datastore or can it be acheived using MySQL replication?? d) Are there any docs or whitepapers for best practices when implementiing a kv datastore on mysql?? e) Are there any known big implementations other that friendfeed doing kv pair using MYSQL?? Would really appreciate some advise from all you Mysql gurus out there !! Thanks In Advance, Amit

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  • Change values in first key from 0 to count(array) - 1

    - by sologhost
    Ok, I have an array like so: $myArray[32]['value'] = 'value1'; $myArray[32]['type'] = 'type1'; $myArray[33]['value'] = 'value2'; $myArray[33]['type'] = 'type2'; $myArray[35]['value'] = 'value3'; $myArray[42]['value'] = 'value4'; $myArray[42]['type'] = 'type4'; Ok, looking for a quick way to change all numbers in the first key 32, 33, 35, and 42 into 0, 1, 2, and 3 instead. But I need to preserve the 2nd key and all of the values. The array is already ordered correctly, since I ordered it using a ksort, but now I need to reset the array from 0 - count($myArray) - 1 and keep the 2nd key intact and its value as well. Can someone please help me?

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  • Walk/loop through an XSL key: how?

    - by krisvandenbergh
    Is there a way to walk-through a key and output all the values it contains? I though of it this way: <xsl:for-each select="key('kElement', '.')"> <li><xsl:value-of select="." /></li> </xsl:for-each> However, this does not work. I simply want to list all the values in a key for testing purposes. The question is simply: how can this be done?

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  • Retrieve the CAKeyframeAnimationKey's key in AnimationDidStop

    - by JacktheSparrow
    I have multiple CAKeyframeAnimation objects, each with a unique key like the following: ..... [myAnimation setValues:images]; [myAnimation setDuration:1]; .... [myLayer addAnimation:myAnimation forKey:@"unique key"]; My question is, if I have multiple animation like this and each with a unique key, how do I retrieve their keys in the method AnimationDidStop? I want to be able to do something like this: -(void)animationDidStop:(CAAnimation*)animation finished:(BOOL)flag{ if(..... ==@"uniquekey1"){ //code to handle this specific animation here: }else if(.... ==@"uiquekey2"){ //code to handle this specific animation here: } }

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  • MySQL : how to add foreign key

    - by garcon1986
    Hello, I have the following code in mysql. create table employee( e_id int(10) not null auto_increment, user_id int(10), usertype_id default 1, name varchar(50), primary key (e_id) ); create table relation( r_id int(10) not null auto_increment, user_id int(10) not null, usertype_id int(10) not null, interest_id int(10) not null, primary key (id) ); Firstly, i want user_id will have the same value as column e_id; And then, i want to add user_id and usertype_id as an unity in table relation as a foreign key for user_id and usertype_id in table employee. Do you know how to do that? Thanks a lot.

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  • change last key name from array in php

    - by robertdd
    i want to be able to change the last key from array i try with this function i made: function getlastimage($newkey){ $arr = $_SESSION['files']; $oldkey = array_pop(array_keys($arr)); $arr[$newkey] = $arr[$oldkey]; unset($arr[$oldkey]); $results = end($arr); //echo json_encode($results); print_r($arr); } if i call the function getlastimage('newkey') it change the key!but after if i print the $_SESSION the key is not changed? why this?

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  • The Columns in table <table> do not match an existing primary key or unique constraint

    - by Sven
    I have 2 tables, Stores - storeId (int) and year (int(4)) both Primary Keys. fruit - fruitId - Primary Key and storeId. I need to create 1 to many relationship between the Store and Fruit (Foreign Key held within Fruit) how ever I always get shown the error - The Columns in table <table> do not match an existing primary key or unique constraint. The type's are both int and named the same. Any help would be appreciate in advance, many thanks.

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  • Editing a TreeView node doesn't change the TreeNode Key

    - by Blitzz
    I have a TreeView with user-editable nodes. I like to use the node caption as key to my tree node : + Root |+ Node1 ||- SubNode1 ||- SubNode2 |+ Node2 ||- SubNode3 ||- SubNode4 So I can reach a node like this: MyTreeView.Nodes["Root"].Nodes["Node2"].Nodes["SubNode3"] The problem is that, as I allow the user to rename any node, I would need also to change the key of my node in its parent in the AfterLabelEdit handler... which seems (logically) not to be done automatically. Unfortunately, Nodes["blabla"] is readonly, Nodes.Add(string Key, TreeNode Node) doesn't exist, and I can't find a way to do this without throwing (sooner or later) a bad exception. Any idea ?

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  • How can I disable the F4 key from showing the items in a ComboBox

    - by Alex
    You might not know this, but pressing the F4 key on a ComboBox makes it's drop-down item list appear. I believe this is the default behavior on Windows. Does anyone know how to override this behavior in WPF (C#)? I know that overriding default behavior is generally seen as bad practice, however in this case I have a rugged-device that runs XP Embedded. It has a handful of prominent Function keys (F1-F6) that need to trigger different events. This works fine, however when focused over a ComboBox the events aren't triggered as the ComboBox drops down. I have tried catching the KeyDown event both on the form and on the ComboBox and listening for the F4 key, however it doesn't get this far as the key press must be handled at a lower level. Any ideas? Thanks.

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  • Multiple column foreign key contraints

    - by eugene4968
    I want to setup table constraints for the following scenario and I’m not sure how to do it or if it’s even possible in SQL Server 2005. I have three tables A,B,C. C is a child of B. B will have a optional foreign key(may be null) referencing A. For performance reasons I also want table C to have the same foreign key reference to table A. The constraint on table C should be that C must reference its parent (B) and also have the same foreign key reference to A as its parent. Anyone have any thoughts on how to do this?

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  • Multiple key/value pairs in HTTP POST where key is the same name

    - by randombits
    I'm working on an API that accepts data from remote clients, some of which where the key in an HTTP POST almost functions as an array. In english what this means is say I have a resource on my server called "class". A class in this sense, is the type a student sits in and a teacher educates in. When the user submits an HTTP POST to create a new class for their application, a lot of the key value pairs look like: student_name: Bob Smith student_name: Jane Smith student_name: Chris Smith What's the best way to handle this on both the client side (let's say the client is cURL or ActiveResource, whatever..) and what's a decent way of handling this on the server-side if my server is a Ruby on Rails app? Need a way to allow for multiple keys with the same name and without any namespace clashing or loss of data.

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  • Key logger wont record key strokes without console

    - by Daniel Gopar
    I created a small basic key logger in C++. For some reason when I compile and run the program with the console displayed, it will record every key stroke I make in whatever program I am using such as a browser and store it in a text file. However when I make it so that it WON'T display a console window, it will not record anything and it's just a process in the background doing nothing. Here is the link to my code: http://pastebin.com/4wqQyLJ9 The function that is giving me trouble with hiding the console, is the Stealth() function. Any suggestions, tips or hints will be helpful. Thanks.

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  • Using one key for Encryption and HMAC

    - by Vladimir
    Hello, I am wondering whether I can use a shared secret key established between two clients as the HMAC key too. I saw that there is a problem when it is used as a CBC-MAC but I haven't found any evidence it is bad practice for HMACs. Thanks, Vladimir

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  • Simulating Key Press event using Python for Linux

    - by user308827
    Hi, I am writing a script to automate running a particular model. When the model fails, it waits for a user input (Enter key). I can detect when the model has failed, but I am not able to use python (on linux) to simulate a key press event. Windows has the SendKeys library to do this but I was wondering if there is a similar library for python on linux. Thanks!

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  • Timestamp as part of composite primary key?

    - by Curtis White
    I get this error when using linq-to-sql with timestamp as part of a composite primary key: "The primary key column of type 'Timestamp' cannot be generated by the server." I'm guessing this may be due to the fact timestamp is just a row version thus perhaps it must be created after the insert? Or...

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