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• Tomcat - Redirect to Error Page when ServletContextListener fails

  - by Vic

  When Tomcat starts it calls my ServletContextListener to obtain a database connection, which I will later use in other servlets with getServletContext(). It is called in my web.xml as: listener listener-class org.ppdc.database.DBCPoolingListener /listener-class /listener (I removed the < because they wouldn't display properly in this message. If I cannot connect to the database when Tomcat starts up I get a 404 error, because Tomcat cannot start the application. How can I redirect the user to a custom error page at this point? I tried the following in my web.xml (I have the < brackets in the original): (error-page) (error-code404/error-code) (location/file_not_found.html/location) (/error-page) Any ideas on how to redirect a user to one of my error pages when Tomcat tries to start the application? Thanks Vic

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• How to get the changes on a branch in git

  - by Greg Hewgill

  What is the best way to get a log of commits on a branch since the time it was branched from the current branch? My solution so far is: git log $(git merge-base HEAD branch)..branch The documentation for git-diff indicates that "git diff A...B" is equivalent to "git diff $(git-merge-base A B) B". On the other hand, the documentation for git-rev-parse indicates that "r1...r2" is defined as "r1 r2 --not $(git merge-base --all r1 r2)". Why are these different? Note that "git diff HEAD...branch" gives me the diffs I want, but the corresponding git log command gives me more than what I want. In pictures, suppose this: x---y---z---branch / ---a---b---c---d---e---HEAD I would like to get a log containing commits x, y, z. "git diff HEAD...branch" gives these commits. However, "git log HEAD...branch" gives x, y, z, c, d, e.

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• How to synch SQLite data to server in iPhone

  - by crawler486

  Hello Guys, I'm a total noob when it comes to iPhone development and have been tasked to create a database app that can download and upload sqlite data to and from a server via http using web services. So far I already have a form for retrieving and saving data to a SQLite database and now I need some information on how I can upload the SQLite data to a server. The SQLite database will only have one table with 3 columns and about 200 rows max. I hope somebody can point me to the right direction or lead me to some sample codes. Appreciate any help.

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• Searching documents by tag using the Scribd API is no longer returning expected results.

  - by George

  Recently I have encountered an issue with Scribd where searching via Scribd API (docs.search) for documents by tag is no longer working. This has been working (for over 6 months) to return a number of documents that I have tagged with "fdsafetyandprevention" (accessible here http://www.scribd.com/tag/fdsafetyandprevention). Just recently my search via the API has stopped working. Note that test searches such as @tags "selfhelp" as described in the Scribd documentation DO work. Could my issue be related to caching or the age of my documents and Scribd choosing to not return them in search results? I have been using scribd.php (http://www.scribd.com/developers/libraries) to interface with the API using $scribd-search(@tags "fdsafetyandprevention", 20, 0, "all"). I am following the Scribd documentation for docs.search and advanced help (http://www.scribd.com/developers/search_help). Help greatly appreciated. George.

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• Authlogic Multiple Password Validation

  - by Hock

  Hello, I'm using Authlogic to manage my user sessions. I'm using the LDAP add-on, so I have the following in my users model acts_as_authentic do |c| c.validate_password_field = false end The problem is that recently I found out that there will be some users inside the application that won't be part of the LDAP (and can't be added!). So I would need to validate SOME passwords against the database and the others against the LDAP. The users whose password will be validated against the database will have an specific attribute that will tell me that that password will be validated in my database. How can I manage that? Is it possible that the validate_password_field receives a "variable"? That way I could create some method that will return true/false depending on where the password validation will be done? Thanks! Nicolás Hock Isaza

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• When I run Django on Dreamhost using SQLite, why do I get an OperationalError telling me that a tabl

  - by Paul D. Waite

  I had a Django site running on Dreamhost. Although I used SQLite when developing locally, I initially used MySQL on Dreamhost, because that’s what the wiki page said to do, and because if I’m using an ORM, I might as well take advantage of it by running against a different database. After a while, I switched the settings on the server to use SQLite, to make it easier to keep my development database in sync with the server one. python manage.py syncdb worked on the server, but when I tried to access the site, I got an OperationalError. The Django error page said that one of my tables didn’t exist. I checked the database using sqlite on the command line on the server, and using python manage.py shell, and both worked fine.

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• C# ProgressBar design pattern

  - by MadSeb

  Hi, I'm working on a database upgrader application. The upgrader updates the schema of a database ( adds new columns, renames columns , adds new tables, new views to an existing database by executing SQL statements ). When a user wants to upgrade from version 1.0 to 2.0 , "Upgrader" objects are taken from an object factory and the "Execute" method of each "Upgrader" is called. The GUI of the application has a progress bar and each time an upgrader object performs a SQL statement the progress bar gets incremented. while (!version.Equal(CurrentVersion)) { IUpgrader myUpgrader = UpgraderFactory.GetUpgrader(version); myUpgrader.Execute(UpgradedFile,progressbar); version.Increment(); } My question is very simple : how should the upgrader object communicate with the progressbar. In the code above, the upgrader object is given direct access to the progressbar but I'm wondering if some better way of doing this or better design pattern exists. Regards, Seb

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• Insert coding query in yii

  - by nerd

  I need to auto insert the next orders_id into an Orders table in a database. orders_id is not the primary Key, and it does not auto-increment I need to query the database, find the last (highest) id value, increment 1, and insert it in Orders table in database. Actually, I have a shipping action which will provide address of shipping of orders. So as soon as the user fills address form and move to payments page, I want to simultaneously fill my Orders table by max(orders_id)+1. I have built relations between Address table and Orders table but my orders Table is not getting populated. Please detail me correct codes to implement it in my controller in Yii

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• Why does git remember changes, but not let me stage them?

  - by Andres Jaan Tack

  I have a list of modifications when I run git status, but I cannot stage them or commit them. How can I fix this? This occurred after pulling the kernelmode directory from a bare repository somewhere in one huge commit. % git status # On branch master # Changed but not updated: # (use "git add <file>..." to update what will be committed) # (use "git checkout -- <file>..." to discard changes in working directory) # # modified: kernelmode/linux-2.6.33/Documentation/IO-mapping.txt # ... $ git add . $ git status # On branch master # Changed but not updated: # (use "git add <file>..." to update what will be committed) # (use "git checkout -- <file>..." to discard changes in working directory) # # modified: kernelmode/linux-2.6.33/Documentation/IO-mapping.txt # ...

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• UML Class Relationships

  - by 01010011

  Hi, I would like to confirm whether I am on the right track when identifying common UML class relationships. For example, is the relationship between: 1 a stackoverflow member and his/her stackoverflow user account categorized as a composition relationship or an aggregation relationship? At first I thought it was an association because this member "has a" account. However on second thought, I am thinking its composition because each "part" (user account) belongs to only one whole (user) at a time, meaning for as long as I am logged into stackoverflow, I have to use this one and only account until I log off. If I log back onto stackoverflow with a different account then its composition again. Do you agree? 2 a database and a person's user account an aggregation relationship? I think so because 1 database (the whole) can store 0...* number of user accounts (the parts) but another database can store the same user accounts. Finally, can anyone recommend a website that specializes in designing code using UML? Thanks in advance

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• C# Class Design Question

  - by Soo

  This is a super newbie question, I've been programming for a while, but am just learning OOP. I have a class that works with user input via the C# console. There are different methods in this class to gather different input sets. I have another class that takes these input sets and puts them in a database. What is the best way to pass the input from my input class to my database insert class? My guess would be: Array1[] = inputClass.GetParameterSet1(); DatabaseInsertClass.InsertIntoDatabase1(Array1[]); Is there anything wrong with this or is there a better way to do this? Should I even have two classes (The database class could also take the user input)?

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• Replacement for MySQL proxy

  - by tostinni

  We have a standard MySQL Master/Slave replication for our database. In order to use the slave server we have set up MySQL Proxy. However we have been strongly discouraged to use it as it still alpha and not very well supported. Our application is built with Drupal 7 which doesn't use very effectively its slave database (see my related question on Drupal Answers). What tools could we use to act like MySQL proxy and send SELECT queries on the slave server in order to distribute the load ?

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• DBMS for POS software

  - by Andrew Smith

  Hello, I want to develop a POS application in .NET (C#) that would be used to rent items. I have a good idea of what will be done and the famous question that I have is about the DBMS that I should use. I would like to use MySQL database. The question is: If some places use only one computer (no network, no internet connection), can I use a MySQL database in local? Do I need to install MySQL server on all thoses computers to be able to use such a database? I know SQLite but I'm not sure if the limitations can cause problems in the future... I also looked at SQLServer Express versions. (I must consider that other point of sales are using multiple computers and more transactions so there I can't put sqlexpress or sqlite) So can anybody suggest me what I should do in that situation? Thanks

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• Make SQL Server 2005 accessible via Internet

  - by Gary Joynes

  I have an application that runs on a client's server built on a SQL Server 2005 database. We have now developed an ASP.NET v2 application which connects to this database. This web application will be hosted on an ISP's server but needs to access the SQL Server database on the client's server. The client's server has a firewall and so forth so I assume it should be possible to make the SQL Server accessible via the Internet but of course I am woriied about security. Can someone point me to some best practices to achieve this.

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• How to get the quickfix timestamp?

  - by yves Baumes

  I've seen in quickfix doxygen documentation that it generates an utc timestamp as soon as it has received a FIX message from a socket file. Have a look in ThreadedSocketConnection::processStream(), it calls then m_pSession->next( msg, UtcTimeStamp() ); I would like to get that timestamp, because I need it to screen network and QuickFix lib latencies. I didn't find a way to get it from FixApplication::fromApp() callback or 'Log::onIncoming()' callback. As I am newbie with quickfix I would like to know if I missed something in the Quickfix documentation. Did anybody ever done that before? Of course there is other solutions, but for homogeneity with others market acces applications I maintain, I would prefer to avoid them. For instance, I would prefer not to modify QuickFix code source. And I would like to avoid re-write the application logic that quickfix provide me, quickfix helpping me only for message decoding.

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• Design Question on when to save

  - by Ben

  Hi, I was just after peoples opinion on when the best time to save an object (or collection of objects) is. I appreciate that it can be completely dependent on the situation that you are in but here is my situation. I have a collection of objects "MyCollection" in a grid. You can open each object "MyObject" in an editor dialogue by double clicking on the grid. Selecting "Cancel" on the dialogue will back out any changes you have made, but should selecting "ok" commit those changes back to the database, or should they commit the changes on that object back to the collection and have a save method that iterates through the collection and saves all changed objects? If i have an object "MyParentObject", that contains a collection of childen "MyChildObjectCollection", none of the changes made to each "MyChildObject" would be commited to the database until the "MyParentObject" was saved - this makes sense. However in my current situation, none of the objects in the collection are linked, therefore should the "Ok" on the dialogue commit the changes to the database? Appreciate any opinions on this. Thanks

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• Django on Dreamhost - testing/sand box environment

  - by elequ

  I've been using webfaction for all my django needs for the last couple of years but have had a high traffic site fall in my lap that dreamhost are probably better suited to handling. To set up and experiment with a site with webfaction there are your [user].webfactional.com accounts. Which is sweet. Equivalently Dreamhost also offers [name].dreamhosters.com Yet this doesn't seem to work with my database and this doesn't seem to be playing nice with setting up django or passenger_wsgi. So I'm wondering if I'm interpreting the documentation correctly to suggest that in order to make a site that depends on passenger it needs to be running from an active domain. The documentation is really implicit, I'm baffled. Has anyone set up a testing/sand box environment for django using dreamhost, or know how to?

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• NHibernate: How to show the generated SQL-statements in the windows console

  - by Rookian

  return Fluently.Configure() .Database(MsSqlConfiguration.MsSql2008 .ConnectionString(c => c .Database(Database) .TrustedConnection() .Server(Server) ).ShowSql()) .ExposeConfiguration(c => c.SetProperty("current_session_context_class", "web")) .Mappings(m => m.FluentMappings.AddFromAssemblyOf<TeamMap>()).BuildConfiguration(); I have a web application. This configuration does not work. I also have a Console application that shall be responsible to write out all generated SQL. How can I get the generated SQL commands? Thanks in advance!

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• Verifying university membership/attendance via email address

  - by mettadore

  My client's web app allows members to sign up (Rails using AuthLogic) and those signups are limited in that they must be under the auspices of a university. To wit: A university organizer can sign up to be the representative of a university, and students can sign up as "attendees" of that university. I've been tasked with finding if there is a programmatic way to verify university membership/attendance. The only way I can see doing this is having a database of universities and a database of associated emails, and verifying that the student's email address is part of this database. That doesn't help if using Facebooker and AuthLogic's "sign up with Facebook credentials" ability, however. I suspect the answer to this is "via human intervention," and that this is something we can't solve programmatically. Either we, or the university, will have to bite the bullet and check records. However, I'd thought I'd ask if anyone else has run into the issue of verification of university membership before.

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• DBLinq not generating where clause

  - by sipwiz

  I'm testing out DBLinq-0.18 and DBLinq from SVN Trunk with MySQL and Postgresql. I'm only using a very simple query but on both database DBLinq is not generating a Where clause. I have confirmed this by turning on statement logging on Postgresql to check exactly what request DBLinq is sending. My Linq query is: MyDB db = new MyDB(new NpgsqlConnection("Database=database;Host=localhost;User Id=postgres;Password=password")); var customers = from customer in db.Customers where customer.CustomerUserName == "test" select customer; The query works ok but the SQL generated by DBLinq is of the form: select customerusername, customerpassword .... from public.customers There is no Where clause which means DBLinq must be pulling the whole table down before running the Linq query. Has anyone had any experience with DBLinq and know what I could be doing wrong?

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• Exception handling in R

  - by gappy

  Does anyone have examples/tutorials of exception handling in R? The official documentation is very terse.

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• KeePass: use a key file or a regular password?

  - by RCIX

  I'm setting up a KeePass database and it offers the ability to use a key file, which it says is more secure because it can use a longer and more complex password but is easier to break because you only need the key file to open the database. I'll only be using the key file on 2 computers (one desktop and one laptop), wo which is the best option? Note that it's definitely more appealing to use the key file for me because i have a hard time remembering anything close to a random password.

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• php echo doesnt print newlines

  - by Skun

  Hey ! I started doing a new project in PHP / MySql . The Aim of this project is to manage articles for a magazine that i am the editor of. So the content of the articles, i decided i would store with the "TEXT" column type of MySql Now when i retrieve this column and print it with echo, the newlines are not there. Its all on the same line. $resset = mysql_query("select txt from articles where id = 1"); $row = mysql_fetch_assoc($resset); $txt = $row['txt']; echo $txt; //doesnt print it as it is in the database as it was typed (multiline) Find below, the text as it looks in the database and as it looks when it is echoed But within the database, its stored with newlines. Has anybody else encountered this problem? Please help me as my project depends on this :|

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• Test problem using JUnitPerf

  - by allenzzzxd

  Hi, guys, I'm writing a JUnit test using JUnitPerf. Here, I want to generate some entries and use them to update a database. To test the capacity of the database, I want several test to run simultaneously or randomly, so I use, for example: Test loadTest = new LoadTest(testCase, n); But, still, I have to insure that in each test, a different update source will be used so that a different entry in the database will be updated. So my question is how can I realize this? Thanks a lot Allen

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• Exchange 2007 + mailbox role - performance counters

  - by Ankh2054

  I hve two exchange server in my org. Exchange 2007 - mailbox role Exchange 2007 client access, transport role I am trying to monitor the following performance counter on my exchange 2007 server (mailbox role) MSExchange Database(Information Store)\Database Page Fault Stalls/sec But I cant find the counter anywhere. I have checked the version of exchange an its 8.3.6 I looked on the other server in case I had it mixed up, but its not here either. Can anyone shed some light ?

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