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• Preview result of update/insert query without comitting changes to database in MySQL?

  - by Camsoft

  I am writing a script to import CSV files into existing tables within my database. I decided to do the insert/update operations myself using PHP and INSERT/UPDATE statements, and not use MySQL's LOAD INFILE command, I have good reasons for this. What I would like to do is emulate the insert/update operations and display the results to the user, and then give them the option of confirming that this is OK, and then committing the changes to the database. I'm using InnoDB database engine with support for transactions. Not sure if this helps but was thinking down the line of insert/update, query data, display to user, then either commit or rollback transaction? Any advise would be appreciated.

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• Where to observe application deployed by Jenkins?

  - by James

  Question from a first-time Jenkins user. So I hope you wouldn't mind if the question is too silly. I have installed jenkins on a Ubuntu machine, and is accessible at localhost:8080. I have successfully configured it to work with Maven2 and Git as well. Next, I created a job/project (A Java/Spring application), and got it to build without error on Jenkins as well. Now my question is, where do I see this application running? :) Best Regards James

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• MS Access questions - Scalability / indexing / transactions

  - by oo

  A few questions on MS Access databases - Size: Are there limits to the size of an access database? The reason i ask is that we have an access database that has a few simple tables. The size of the db is about 1GB. When I do a query on it, i see it taking over 10 minutes to run. With proper indexing, should MS Access be able to handle this or are there fundamental limitations to the technology. This is MS Access XP. Also, does MS Access support db transactions, commit and rollback?

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• Getting started with Qt4: which book to read?

  - by Pieter

  I'm trying to learn Qt4. I have written code in C, C#, Python, PHP, Java and JavaScript before, but not in C++. Is there a book on Qt4 that you can recommend me? I've found some books I might like, but they're a little on the expensive side. I'm not ready to commit to Qt before I've played with it for a while, so I'd prefer to keep it under 30 bucks. I will accept the answer that gets the most up votes.

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• How do I store in subversion my customizations to a public open source project?

  - by Clyde

  Hi, I'm working on customizing a couple of open source projects in ways that are very much personalized -- i.e., not appropriate to send the patches back to the maintainers for the public. One of them is stored in CVS, one in SVN. I use SVN for my own work. The CVS project is fine. I check the tree in to my svn repository, including the CVS directories. I can commit all my changes, and still do a cvs update to stay up to date with bug fixes/features of the public project. How should I work on the svn project? Is there a 'best practice' or known procedure for this kind of scenario?

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• Building FFmpeg for Android

  - by varevarao

  I've spent almost a week on this now, trying to get FFmpeg "Angel" to build for Android. I've tried build scripts from all over the internet to no avail. I got closest was using this. A sthe author himself says the script doesn't work for newer versions of FFmpeg due to this bug, which has been dismissed on that ticket saying "I found a Makefile that does it." This was dis-heartening, being the only post on all of the cast Google world that was anywhere close to my problem. So, question time: Is there a way to get around the above bug? I'm trying to use the newest ffmpeg API, and "Love" is just giving me "undefined reference" errors while trying to use av_encode_video2(), and av_free_frame(). The code I was working on the lines of is at the ffmpeg git repo, under /doc/examples/decoding_encoding.c (the function starting on line 338)

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• Rails 3 routes and using GET to create clean URLs?

  - by Hard-Boiled Wonderland

  I am a little confused with the routes in Rails 3 as I am just starting to learn the language. I have a form generated here: <%= form_tag towns_path, :method => "get" do %> <%= label_tag :name, "Search for:" %> <%= text_field_tag :name, params[:name] %> <%= submit_tag "Search" %> <% end %> Then in my routes: get "towns/autocomplete_town_name" get "home/autocomplete_town_name" match 'towns' => 'towns#index' match 'towns/:name' => 'towns#index' resources :towns, :module => "town" resources :businesses, :module => "business" root :to => "home#index" So why when submitting the form do I get the URL: /towns?utf8=?&name=townname&commit=Search So the question is how do I make that url into a clean url like: /towns/townname Thanks, Andrew

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• Problem with SQLite executemany

  - by Strider1066

  I can't find my error in the following code. When it is run a type error is given for line: cur.executemany(sql % itr.next()) = 'function takes exactly 2 arguments (1 given), import sqlite3 con = sqlite3.connect('test.sqlite') cur = con.cursor() cur.execute("create table IF NOT EXISTS fred (dat)") def newSave(className, fields, objData): sets = [] itr = iter(objData) if len(fields) == 1: sets.append( ':' + fields[0]) else: for name in fields: sets.append( ':' + name) if len(sets)== 1: colNames = sets[0] else: colNames = ', '.join(sets) sql = " '''insert into %s (%s) values(%%s)'''," % (className, colNames) print itr.next() cur.executemany(sql % itr.next()) con.commit() if __name__=='__main__': newSave('fred', ['dat'], [{'dat':1}, {'dat':2}, { 'dat':3}, {'dat':4}]) I would appreciate your thoughts.

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• MySQL Simple query gives "Query was empty". Transaction help needed I think.

  - by user129609

  Hi, I'm trying to do a simple transaction in MySQL delimiter go start transaction; BEGIN DECLARE EXIT HANDLER FOR SQLEXCEPTION, SQLWARNING, NOT FOUND ROLLBACK; INSERT INTO jext_categories (Name) VALUES ('asdfas'); INSERT INTO jext_categories (Name) VALUES ('asdfas2'); END; commit; SELECT * FROM jext_categories; go delimiter ; but I keep getting an error saying query was empty. Could someone please tell me what I am doing wrong, and also, what is the proper format for doing a transaction in MySQL? Thanks!

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• Hibernate deletion issue

  - by muffytyrone

  I'm trying to write a Java app that imports a data file. The process is as follows Create Transaction Delete all rows from datatable Load data file into datatable Commit OR Rollback if any errors were encountered. The data loaded in step 3 is mostly the same as the data deleted in step3. The deletion is performed using the following DetachedCriteria criteria = DetachedCriteria.forClass(myObject.class); List<myObject> myObjects = hibernateTemplate.findByCriteria(criteria); hibernateTemplate.deleteAll(myObjects); When I then load the datafile, i get the following exception nested exception is org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: The whole process needs to take place in transaction. And I don't really want to have to compare the import file / data table and then perform an insert/update/delete to get them into sync. Any help would be appreciated.

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• Can I automatically overwrite repository files using svn_load_dirs.pl or similiar?

  - by Andy Strang

  I am working with a legacy VSS repository which was transferred over to a new SVN repository a few months ago. In the meantime, before we go live with the SVN repository, we need to bring over all the changes that have happened on the VSS one between then and now. I was looking at different ways to do this which seem to be things such as: 1.) svn_load_dirs.pl then merge the files manually? 2.) svn import straight into the trunk and merge files manually 3.) checkout a working copy of my SVN repository, copy in the changed files which will overwrite some of the ones in my working copy then commit the changes. My question is, can any of these options be used (or any other options) to automate things so that I don't have to merge the files, and can instead just overwrite them? I think only Option 3 would do this but any help is appreciated.

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• How to validate Windows VC++ DLL on Unix systems

  - by Guildencrantz

  I have a solution, mostly C#, but with a few VC++ projects, that is pushed through our standard release process (perl and bash scripts on Unix boxes). Currently the initiative is to validate DLL and EXE versions as they pass through the process. All the versioning is set so that File Version is of the format $Id: $ (between the colon and the second dollar should be a git commit hash), and the Product Version is of the format $Hudson Build: $ (between the colon and the second dollar should be a string representing the hudson build details). Currently this system works extremely well for the C# projects because this version information is stored as plain strings within the compiled code (you can literally use the unix strings command and see the version information); the problem is that the VC++ projects do not expose this information as strings (I have used a windows system to verify that the version information is correctly being set), so I'm not sure how to extract the version on a unix system. Any suggestions for either A) Getting a string representation of the version embedded in the compiled code, or B) A utility/script which can extract this information?

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• Could I use Revert after abrupting Merge?

  - by John

  Hallo all, Just now I tried to upload a modified working copy to its branch in the following steps: 1. Update 2. Commit Then I attempted to Merge the changes in the trunk to this branch. However during editing of the conflicts I realized there were so many conflicting codes that I could not address completely today, then I gived up the Merge, and the working copy got an exclamation mark immediately. Thru Check for modifications I found that many many files had been modified or had conflicts. It seems that the Merge has been somehow wrongly carried out. My question: could I return to the state before the Merge simply using Revert? Thanks a lot in advance, John

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• rails rollback updates when task fails

  - by ash34

  Hi, I have the following "generate_report" method being called from a rake task, which gets a hash as an input, that contains the reported hours spent by each user on a task and outputs the data as a .csv report. desc "Task reporting" task :report, [:inp_dt] => [:environment] do |t, args| h = select_data(args.inp_dt) /* not shown here */ generate_report(h) end def generate_report(h) out_dir = File.dirname(__FILE__) + '/../../output' myfile = "#{out_dir}" + "/monthly_#{Date.today.strftime("%m%d%Y")}.csv" writer = CSV.open(myfile, 'w') h.each do |h,v| v.each do |key,val| writer << val end end writer.close end where h = {:BILL=>{:PROJA=>["CYR", "00876", "2", 24], :PROJB=>["EPR", "00876", "2", 16]}, :JANE=>{:PROJA=>["TRB", "049576", "2", 16]}} I would like to set/update a 'processed' flag for each reported transaction and only commit the update when the file is written correctly or rollback the updates when the task fails. How can I accomplish this. thanks, ash

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• How to change the size and color of Petrel "Attributes Labels" using Ocean

  - by Nautilus

  I add a property to a PolylineSet using the code below (In the Petrel UI they are named “Attribute labels”) using (ITransaction trans = DataManager.NewTransaction()) { trans.Lock(polylineSet); PolylinePropertyCollection ppc = polylineSet.CreatePropertyCollection(); trans.Lock(ppc); property = ppc.CreateProperty(PetrelProject.WellKnownTemplates.MiscellaneousGroup.General, name); trans.Commit(); } I would like to change the size and color. Does anyone know if this is possible via Ocean? I want to do this because these labels have a size of 1 and color black and it isn't a good default for me. Thanks in advance

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• Best Practices for a Web App Staging Server (on a budget)

  - by fig-gnuton

  I'd like to set up a staging server for a Rails app. I use git & github, Cap, and have a VPS with Apache/Passenger. I'm curious as to the best practices for a staging setup, as far as both the configuration of the staging server as well as the processes for interacting with it. I do know it should be as identical to the production server as possible, but restricting public access to it will limit that, so tips on securing it only for my use would also be great. Another specific question would be whether I could just create a virtual host on the VPS, so that the staging server could reside alongside the production one. I have a feeling there may be reasons to avoid this, though.

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• Correct structure and way of website versioning

  - by Saif Bechan

  Recently I use GIT to version my website. It makes it all really easy to see how my project develops and I always have save backups on different places on the web. Now my main question is if it is recommended to version your whole root of the website. I have a basic structure that looks something like this: /httpdocs /config /media /application index.php .htaccess 1) Should I use the /httpdocs folder to version, or should I use the content of the folder. 2) Is it recommended to version the media folder. In the media version I have several images for the overall layout, and some other images for the website. These imagas can be quite large. I work on these images from time to time and so they change. I hardly never need the old image again, so is this not just taking up precious storage space. I would highly appreciate just some basic recommendation on this topic.

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• Error(2,7): PLS-00428: an INTO clause is expected in this SELECT statement

  - by omgzor

  I'm trying to create this trigger and getting the following compiler errors: create or replace TRIGGER RESTAR_PLAZAS AFTER INSERT ON PLAN_VUELO BEGIN SELECT F.NRO_VUELO, M.CAPACIDAD, M.CAPACIDAD - COALESCE(( SELECT count(*) FROM PLAN_VUELO P WHERE P.NRO_VUELO = F.NRO_VUELO ), 0) as PLAZAS_DISPONIBLES FROM VUELO F INNER JOIN MODELO M ON M.ID = F.CODIGO_AVION; END RESTAR_PLAZAS; Error(2,7): PL/SQL: SQL Statement ignored Error(8,5): PL/SQL: ORA-00933: SQL command not properly ended Error(8,27): PLS-00103: Encountered the symbol "end-of-file" when expecting one of the following: begin case declare end exception exit for goto if loop mod null pragma raise return select update while with <an identifier> <a double-quoted delimited-identifier> <a bind variable> << close current delete fetch lock insert open rollback savepoint set sql execute commit forall merge pipe Error(2,1): PLS-00428: an INTO clause is expected in this SELECT statement What's wrong with this trigger?

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• Persistence store in blackberry

  - by arunabha

  i am trying to save a simple string value "1".If i go back from one screen to another,its saving,but when i exit the app,and start again,i dont see that value being saved.I am implementing persistable interface.Can anyone suggest me where i am getting wrong import net.rim.device.api.util.Persistable; import net.rim.device.api.system.PersistentObject; import net.rim.device.api.system.PersistentStore; public class Persist implements Persistable { public static PersistentObject abc; public static String b; static { abc = PersistentStore.getPersistentObject(0xb92c8fe20b256b82L); } public static void data(){ synchronized (abc) { abc.setContents(1+""); abc.commit(); } } public static String getCurrQuestionNumber() { synchronized (abc) { System.out.println("new title is"+b); b= (String)abc.getContents(); System.out.println("title is"+b); return b; } } }

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• Pre-packaged Rails applications

  - by Craig

  Seems like most Rails applications have similar 'base' functionality. As such, it seems that there would be value in having pre-build Rails applications at various functionality points such as: basic User model with authentication using Authlogic #1 + openid integration #2 + authorization using declarative_authorization #3 + Administration module #4 + a Profile model Themes (useful stylesheets and such) Friendship model Geocoding ... In addition to the basic MVC stuff, these applications would include: testing harnesses seed data git support One could choose start from any of these functionality points. Other than the sample application that are available with the various gems/plugins, are there projects such as these? If not, I would certainly be willing to contribute what I have.

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• Override Django inlineformset_factory has_changed() to always return True

  - by John

  Hi, I am using the django inlineformset_factory function. a = get_object_or_404(ModelA, pk=id) FormSet = inlineformset_factory(ModelA, ModelB) if request.method == 'POST': metaform = FormSet (instance=a, data=request.POST) if metaform.is_valid(): f = metaform.save(commit=False) for instance in f: instance.updated_by = request.user instance.save() else: metaform = FormSet(instance=a) return render_to_response('nodes/form.html', {'form':metaform}) What is happening is that if I change any of the data then everything works ok and all the data gets updated. However if I don't change any of the data then the data is not updated. i.e. only entries which are changed go through the for loop to be saved. I guess this makes sense as there is no point saving data if it has not changed. However I need to go through and save every object in the form regardless of whether it has any changes on not. So my question is how do I override this so that it goes through and saves every record whether it has any changes or not? Hope this makes sense Thanks

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• Would this prevent the row from being read during the transaction?

  - by acidzombie24

  I remember an example where reads in a transaction then writing back the data is not safe because another transaction may read/write to it in the time between. So i would like to check the date and prevent the row from being modified or read until my transaction is finish. Would this do the trick? and are there any sql variants that this will not work on? update tbl set id=id where date>expire_date and id=@id Note: dateexpire_date happens to be my condition. It could be anything. Would this prevent other transaction from reading the row until i commit or rollback?

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• What would you like to see in a book about Rails 3?

  - by Ryan Bigg

  Hello, I'm thinking of writing a book about Rails 3 and I have a basic idea of what I want to write about, but really what I need is that little bit of polish from the community. The book is planned to cover: A little bit of Ruby Version control using Git Testing using RSpec & Cucumber Life without Rails (Rack) Developing an application in Rails (vague, I know, sorry! Work in progress) Javascript testing using Selenium Background processing Document databases (a tentative maybe, at this stage) Monitoring an application And a little more. So, I leave this question for you: What do you want to see in a book about Rails 3, which goes from "This is Rails" to "This is how Rails scales"?

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• Jet Database (ms access) ExecuteNonQuery - Can I make it faster?

  - by bluebill

  Hi all, I have this generic routine that I wrote that takes a list of sql strings and executes them against the database. Is there any way I can make this work faster? Typically it'll see maybe 200 inserts or deletes or updates at a time. Sometimes there is a mixture of updates, inserts and deletes. Would it be a good idea to separate the queries by type (i.e. group inserts together, then updates and then deletes)? I am running this against an ms access database and using vb.net 2005. Public Function ExecuteNonQuery(ByVal sql As List(Of String), ByVal dbConnection as String) As Integer If sql Is Nothing OrElse sql.Count = 0 Then Return 0 Dim recordCount As Integer = 0 Using connection As New OleDb.OleDbConnection(dbConnection) connection.Open() Dim transaction As OleDb.OleDbTransaction = connection.BeginTransaction() 'Using cmd As New OleDb.OleDbCommand() Using cmd As OleDb.OleDbCommand = connection.CreateCommand cmd.Connection = connection cmd.Transaction = transaction For Each s As String In sql If Not String.IsNullOrEmpty(s) Then cmd.CommandText = s recordCount += cmd.ExecuteNonQuery() End If Next transaction.Commit() End Using End Using Return recordCount End Function

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• What are the best settings of the H2 database for high concurrency?

  - by dexter

  There are a lot of settings that can be used in H2 database. AUTO_SERVER, MVCC, LOCK_MODE, FILE_LOCK and MULTI_THREADED. I wonder what combination works best for high concurrency setup e.g. one thread is doing INSERTs and another connection does some UPDATEs and SELECTs? I tried MVCC=TRUE;LOCK_MODE=3lFILE_LOCK=NO but whenever I do some UPDATEs in one connection, the other connection does not see it even though I commit it. By the way the connections are from different processes e.g. separate program.

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