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• Design pattern to encapsulate common funtionality among UI controls

  - by Dan

  I'm brainstorming some ideas around a pattern to use for the following scenario. I have some 3rd party controls that I want to add common functionality to. Functionality is added by handling several of the the events and doing certain things when the events fire along with adding some private variables to hold some state info between events. I want to reuse the code and functionality so this is what I'd typically do. Create a class for this functionality and pass in the instance of the control that I want to add the functionality to in the constructor. Then I can add event handlers to the control in the instance of the class. Can anyone think of alternative patterns to use in order to create this kind of reusable functionality.

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• Common Utility for Exception Searching

  - by Andrew

  I wrote this little helper method to search the exception chain for a particular exception (either equals or super class). However, this seems like a solution to a common problem, so was thinking it must already exist somewhere, possibly in a library I have already imported. So, any ideas on if/where this might exist? boolean exceptionSearch(Exception base, Class<?> search) { Throwable e = base; do { if (search.isAssignableFrom(e.getClass())) { return true; } } while ((e = e.getCause()) != null); return false; }

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• How to get common field in ten tables with different field name

  - by Fero

  Hi all, I am having a common field in ten tables with different field name. example: table1: t1_id     t1_location 1         india 2         china 3         america table2: t2_id     t2_location 4         london 5         australia 6         america Now my o/p should be: location india china america london australia How should i get that using mysql query. thanks in advance

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• Find MySQL entries with same set of column B values for their common column A value

  - by nnsd44g

  I have: +----+------+------+ | id | A | B | +----+------+------+ | 1 | 1 | 1 | < | 2 | 1 | 2 | < | 3 | 2 | 2 | | 4 | 2 | 3 | | 5 | 3 | 1 | < | 6 | 3 | 2 | < | 7 | 4 | 4 | | 8 | 4 | 5 | +----+------+------+ I need to select the entries that have the same set of B values for their common A value. So, in this case, I need ids 1, 2 and 5, 6 because in those cases the sequence of B values is 1, 2. Is this possible? Thanks!

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• CLR - Common language runtime detected an invalid program in VS.NET

  - by Jimmy

  I have been using Visual Studio 2008 quite long but lately I am getting this message when I am developing an application in C#: Common language runtime detected an invalid program This happens when I try to enter to the properties of a component (text masked box properties, tool box property etc..). But it really became a problem when I tried to launch an other solution that I downloaded from the Developer's 5 star program of Microsoft and it didn't allowed me to launch at all and just got the same problem... I looked for the answer at google but just got some clues about people having the same vague error but in different situations like in ASP.NET I would appreciate any help with this issue... :( I do not want to reinstall VS, that will be my last resource... Update: I never figured out what the problem was so I installed a virtual machine with Windows XP on it, there I only have Visual Studio and Netbeans.

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• Find a common element within N arrays

  - by kunjaan

  If I have N arrays, what is the best(Time complexity. Space is not important) way to find the common elements. You could just find 1 element and stop. Edit: The elements are all Numbers. Edit: These are unsorted. Please do not sort and scan. This is not a homework problem. Somebody asked me this question a long time ago. He was using a hash to solve the problem. I was thinking if SO has solved similar problems.

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• Inserting Record into multiple tables No Common ID

  - by the_

  OK so I have two tables, MEDIA and BUSINESS. I want it set up so the forms to input into them are on the same page. MEDIA has a row that is biz_id that is the id of BUSINESS. So MEDIA is really a part of BUSINESS. HOW do I insert/add these into their tables without a common ID because I haven't yet made the record for business? I'm sorry I didn't really word this very much... You might need more clarification to answer properly and I'll be glad to give any more info. Any help would be greatly appreciated, thanks!

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• Common type for generic classes of different types

  - by DinGODzilla

  I have (for example) Dictionary of different generic types (d1, d2, d3, d4) and I want to store them in something var d1 = new Dictionary<int, string>(); var d2 = new Dictionary<int, long>(); var d3 = new Dictionary<DateTime, bool>(); var d4 = new Dictionary<string, object>(); var something = ??? //new List<object> {d1, d2, d3, d4}; Is there any other way how to store that in something with common denominator different than object? Thanks :-)

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• Permission denied error when trying to install with wubi

  - by badri

  I run into problem when tried to install Ubuntu 11.04 on Windows 7 using wubi installer . It downloads the image for sometime and ends up with the error that says Permission denied: for more details see the log file In the log it seems to be like DownloadError: Problem connecting to tracker - urlopen error (10060, 'Operation timed out') but my network is good and I checked it. Tried using wubi several times, but ends up with same problem. Log content: 10-08 16:56 DEBUG TaskList: ### Finished get_metalink 10-08 16:56 DEBUG TaskList: New task download 10-08 16:56 DEBUG TaskList: ### Running download... 10-08 16:56 DEBUG btdownloader: downloading http://releases.ubuntu.com/11.04/ubuntu-11.04-desktop-amd64.iso.torrent > C:\ubuntu\install\ubuntu-11.04-desktop-amd64.iso 10-08 18:02 ERROR TaskList: Traceback (most recent call last): File "\lib\bittorrent\RawServer.py", line 229, in listen_forever File "\lib\wubi\backends\common\btdownloader.py", line 70, in error_callback DownloadError: Traceback (most recent call last): File "\lib\bittorrent\RawServer.py", line 221, in listen_forever File "\lib\bittorrent\Rerequester.py", line 96, in fail File "\lib\wubi\backends\common\btdownloader.py", line 70, in error_callback DownloadError: Problem connecting to tracker - urlopen error (10060, 'Operation timed out') Traceback (most recent call last): File "\lib\wubi\backends\common\tasklist.py", line 197, in __call__ File "\lib\wubi\backends\common\btdownloader.py", line 79, in download File "\lib\bittorrent\download.py", line 303, in download File "\lib\bittorrent\RawServer.py", line 256, in listen_forever File "\lib\wubi\backends\common\btdownloader.py", line 70, in error_callback DownloadError: Traceback (most recent call last): File "\lib\bittorrent\RawServer.py", line 229, in listen_forever File "\lib\wubi\backends\common\btdownloader.py", line 70, in error_callback DownloadError: Traceback (most recent call last): File "\lib\bittorrent\RawServer.py", line 221, in listen_forever File "\lib\bittorrent\Rerequester.py", line 96, in fail File "\lib\wubi\backends\common\btdownloader.py", line 70, in error_callback DownloadError: Problem connecting to tracker - urlopen error (10060, 'Operation timed out') 10-08 18:02 ERROR TaskList: Non fatal error Traceback (most recent call last): File "\lib\bittorrent\RawServer.py", line 229, in listen_forever File "\lib\wubi\backends\common\btdownloader.py", line 70, in error_callback DownloadError: Traceback (most recent call last): File "\lib\bittorrent\RawServer.py", line 221, in listen_forever File "\lib\bittorrent\Rerequester.py", line 96, in fail File "\lib\wubi\backends\common\btdownloader.py", line 70, in error_callback DownloadError: Problem connecting to tracker - urlopen error (10060, 'Operation timed out') in task download 10-08 18:02 DEBUG TaskList: ### Finished download 10-08 18:02 ERROR TaskList: [Errno 13] Permission denied: u'C:\\ubuntu\\install\\ubuntu-11.04-desktop-amd64.iso' Traceback (most recent call last): File "\lib\wubi\backends\common\tasklist.py", line 197, in __call__ File "\lib\wubi\backends\common\backend.py", line 492, in get_iso File "\lib\wubi\backends\common\backend.py", line 347, in download_iso OSError: [Errno 13] Permission denied: u'C:\\ubuntu\\install\\ubuntu-11.04-desktop-amd64.iso' 10-08 18:02 DEBUG TaskList: # Cancelling tasklist 10-08 18:02 DEBUG TaskList: # Finished tasklist 10-08 18:02 ERROR root: [Errno 13] Permission denied: u'C:\\ubuntu\\install\\ubuntu-11.04-desktop-amd64.iso' Traceback (most recent call last): File "\lib\wubi\application.py", line 57, in run File "\lib\wubi\application.py", line 131, in select_task File "\lib\wubi\application.py", line 157, in run_installer File "\lib\wubi\backends\common\tasklist.py", line 197, in __call__ File "\lib\wubi\backends\common\backend.py", line 492, in get_iso File "\lib\wubi\backends\common\backend.py", line 347, in download_iso OSError: [Errno 13] Permission denied: u'C:\\ubuntu\\install\\ubuntu-11.04-desktop-amd64.iso'

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• What is the greatest design flaw you have faced in any programming language?

  - by Anto

  All programming languages are having their design flaws simply because not a single language can be perfect, just as with most (all?) other things. That aside, which design fault in a programming language has annoyed you the most through your history as a programmer? Note that if a language is "bad" just because it isn't designed for a specific thing isn't a design flaw, but a feature of design, so don't list such annoyances of languages. If a language is illsuited for what it is designed for, that is of course a flaw in the design. Implementation specific things and under the hood things do not count either.

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• Oracle E-Business Supply Chain Suite Release 12.1.2: Latest & Greatest!

  - by [email protected]

  This week we hosted one of several planned orientation and training sessions for the ASR/ASM sales community.  The purpose of the session was to orient our contact center and marketing associates with the 'hotpoints' of the latest release and to provide a few 'snippets' for the scheduled 'call-down' to the installed base.  Oracle EBS Release 12.1.2 contains some of the most powerful supply chain applications technology available to the industrial, commercial and public sector communities.  They should all be taking advantage of this great capability to drive margins, control costs and achieve compliance.   In today's changing business landscape, organizations need competitive advantage and we see that R12 provides this capability according to our customers leveraging the upgrade.

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• Whats the greatest most impressive programing feat you ever witnessed? [closed]

  - by David Reis

  Everyone knows of the old adage that the best programmers can be orders of magnitude better than the average. I've personally seen good code and programmers, but never something so absurd. So the questions is, what is the most impressive feat of programming you ever witnessed or heard of? You can define impressive by: The scope of the task at hand e.g. John single handedly developed the framework for his company, a work comparable in scope to what the other 200 employed were doing combined. Speed e.g. Stu programmed an entire real time multi-tasking app OS on an weekened including its own C compiler and shell command line tools Complexity e.g. Jane rearchitected our entire 10 millon LOC app to work in a cluster of servers. And she did it in an afternoon. Quality e.g. Charles's code had a rate of defects per LOC 100 times lesser than the company average. Furthermore he code was clean and understandable by all. Obviously, the more of these characteristics combined, and the more extreme each of them, the more impressive is the feat. So, let me have it. What's the most absurd feat you can recount? Please provide as much detail as possible and try to avoid urban legends or exaggerations. Post only what you can actually vouch for. Bonus questions: Was the herculean task a one-of, or did the individual regularly amazed people? How do you explain such impressive performance? How was the programmer recognized for such awesome work?

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• Weblogic JDBC datasource,java.sql.SQLException: Cannot obtain XAConnection weblogic.common.resourcep

  - by gauravkarnatak

  I am using weblogic JDBC datasource and my DB is oracle 10g,below is the configuration. It used to work fine but suddenly it started giving problem,please see below exception. Weblogic JDBC datasource,java.sql.SQLException: Cannot obtain XAConnection weblogic.common.resourcepool.ResourceLimitException: No resources currently available in pool <?xml version="1.0" encoding="UTF-8"?> <jdbc-data-source xmlns="http://www.bea.com/ns/weblogic/90" xmlns:sec="http://www.bea.com/ns/weblogic/90/security" xmlns:wls="http://www.bea.com/ns/weblogic/90/security/wls" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.bea.com/ns/weblogic/920 http://www.bea.com/ns/weblogic/920.xsd" XL-Reference-DS jdbc:oracle:oci:@abc.COM oracle.jdbc.driver.OracleDriver user DEV_260908 password password dll ocijdbc10 protocol oci oracle.jdbc.V8Compatible true baseDriverClass oracle.jdbc.driver.OracleDriver 1 100 1 true SQL SELECT 1 FROM DUAL DataJndi OnePhaseCommit This exception is coming on dev environment where connected user is only one. I know, this is related to pool max size but I also suspect this could be due to oracle,might be oracle isn't able to create connections. below are my queries Is there any debug/logging parameter to enable datasource logging,so that I can check no of connections acquired,released and unused in logs ? How to check oracle connection limit for a particular user ?

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• Common coding style for Python?

  - by Oscar Carballal

  Hi, I'm pretty new to Python, and I want to develop my first serious open source project. I want to ask what is the common coding style for python projects. I'll put also what I'm doing right now. 1.- What is the most widely used column width? (the eternal question) I'm currently sticking to 80 columns (and it's a pain!) 2.- What quotes to use? (I've seen everything and PEP 8 does not mention anything clear) I'm using single quotes for everything but docstrings, which use triple double quotes. 3.- Where do I put my imports? I'm putting them at file header in this order. import sys import -rest of python modules needed- import whatever import -rest of application modules- <code here> 4.- Can I use "import whatever.function as blah"? I saw some documents that disregard doing this. 5.- Tabs or spaces for indenting? Currently using 4 spaces tabs. 6.- Variable naming style? I'm using lowercase for everything but classes, which I put in camelCase. Anything you would recommend?

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• The ORDER BY clause is invalid in views, inline functions, derived tables, subqueries, and common ta

  - by zurna

  I get "The ORDER BY clause is invalid in views, inline functions, derived tables, subqueries, and common table expressions, unless TOP or FOR XML is also specified." error with the following code. I initially had two tables, ADSAREAS & CATEGORIES. I started receiving this error when I removed CATEGORIES table. Select Case SIDX Case "ID" : SQLCONT1 = " AdsAreasID" Case "Page" : SQLCONT1 = " AdsAreasName" Case Else : SQLCONT1 = " AdsAreasID" End Select Select Case SORD Case "asc" : SQLCONT2 = " ASC" Case "desc" : SQLCONT2 = " DESC" Case Else : SQLCONT2 = " ASC" End Select ''# search feature ---> Select Case SEARCHFIELD Case "ID" : SQLSFIELD = "AND AdsAreasID" Case "Ads Areas" : SQLSFIELD = "AND AdsAreasName" Case Else : SQLSFIELD = "" End Select Select Case SEARCHOPER Case "eq" : SQLSOPER = " = " & SEARCHSTRING Case "ne" : SQLSOPER = " <> " & SEARCHSTRING Case "lt" : SQLSOPER = " <" & SEARCHSTRING Case "le" : SQLSOPER = " <= " & SEARCHSTRING Case "gt" : SQLSOPER = " >" & SEARCHSTRING Case "ge" : SQLSOPER = " >= " & SEARCHSTRING Case "bw" : SQLSOPER = " LIKE '" & SEARCHSTRING & "%' " Case "ew" : SQLSOPER = " LIKE '%" & SEARCHSTRING & "' " Case "cn" : SQLSOPER = " LIKE '%" & SEARCHSTRING & "%' " Case Else : SQLSOPER = "" End Select ''# search feature ---> SQL = "SELECT * FROM ( SELECT A.AdsAreasID, A.AdsAreasName, ROW_NUMBER() OVER (ORDER BY A.AdsAreasID) As Row" SQL = SQL & " FROM ADSAREAS A" SQL = SQL & " WHERE Row > ("& RecordsPageSize - RecordsPerPage &") AND Row <= ("& RecordsPageSize &") ORDER BY" & SQLCONT1 & SQLCONT2 Set objXML = objConn.Execute(SQL)

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• Managing common components with Fossil CVS

  - by Larry Lustig

  I'm a Fossil (and CVS configuration novice) attempting to create and manage a set of distributed Fossil repositories for a Delphi project. I have the following directory tree: Projects Some Project Delphi Components LookupListView Some Client Some Project For Client Some Other Project For Client Source Code Project Resources Project Database I am setting up Fossil version control in order to version and share Projects\Some Client\Some Other Project For Client\Source Code, which contains Delphi 2010 source for a database project. This project makes use of Projects\Delphi Components\LookupListView which is a Delphi component. I need this code to be included in the versioning system for my project. I will, in theory, need to include it in other Fossil repositories in the future, as well. If I create my Fossil repository at the Source Code or Some Other Project For Client level, I cannot add any code above that level to my repository. What is the proper way to deal with this? The two solutions that occur to me are 1) Creating a separate repository for LookupListView and make sure that everyone who uses a repository for a project that references it "knows" that they must also get the current version of this project as well. This seems to defeat the purpose of being able to obtain a complete, current version of the project with a single checkout. The problem is magnified because there are other common component dependencies in this project. 2) Establishing my Fossil repository in the Projects directory, so I can check in files from various subfolders. This seems to me to involve an awful lot of extra path-typing when doing adds, and also to impose my directory structure (Some Client\Some Other Project For Client\Source) on the other users of the repository -- in this case, the actual client. Any suggestions appreciated.

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• Linq join two dictionaries using a common key

  - by rboarman

  Hello, I am trying to join two Dictionary collections together based on a common lookup value. var idList = new Dictionary<int, int>(); idList.Add(1, 1); idList.Add(3, 3); idList.Add(5, 5); var lookupList = new Dictionary<int, int>(); lookupList.Add(1, 1000); lookupList.Add(2, 1001); lookupList.Add(3, 1002); lookupList.Add(4, 1003); lookupList.Add(5, 1004); lookupList.Add(6, 1005); lookupList.Add(7, 1006); // Something like this: var q = from id in idList.Keys join entry in lookupList on entry.Key equals id select entry.Value; The Linq statement above is only an example and does not compile. For each entry in the idList, pull the value from the lookupList based on matching Keys. The result should be a list of Values from lookupList (1000, 1002, 1004). What’s the easiest way to do this using Linq? Thank you, Rick

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• Common one-to-many table for multiple entities

  - by Ben V

  Suppose I have two tables, Customer and Vendor. I want to have a common address table for customer and vendor addresses. Customers and Vendors can both have one to many addresses. Option 1 Add columns for the AddressID to the Customer and Vendor tables. This just doesn't seem like a clean solution to me. Customer Vendor Address -------- --------- --------- CustomerID VendorID AddressID AddressID1 AddressID1 Street AddressID2 AddressID2 City... Option 2 Move the foreign key to the Address table. For a Customer, Address.CustomerID will be populated. For a Vendor, Address.VendorID will be populated. I don't like this either - I shouldn't need to modify the address table every time I want to use it for another entity. Customer Vendor Address -------- --------- --------- CustomerID VendorID AddressID CustomerID VendorID Option 3 I've also seen this - only 1 foreign key column on the Address table with another column to identify which foreign key table the address belongs to. I don't like this one because it requires all the foreign key tables to have the same type of ID. It also seems messy once you start coding against it. Customer Vendor Address -------- --------- --------- CustomerID VendorID AddressID FKTable FKID So, am I just too picky, or is there something I haven't thought of?

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• Are bad data issues that common?

  - by Water Cooler v2

  I've worked for clients that had a large number of distinct, small to mid-sized projects, each interacting with each other via properly defined interfaces to share data, but not reading and writing to the same database. Each had their own separate database, their own cache, their own file servers/system that they had dedicated access to, and so they never caused any problems. One of these clients is a mobile content vendor, so they're lucky in a way that they do not have to face the same problems that everyday business applications do. They can create all those separate compartments where their components happily live in isolation of the others. However, for many business applications, this is not possible. I've worked with a few clients, one of whose applications I am doing the production support for, where there are "bad data issues" on an hourly basis. Yeah, it's that crazy. Some data records from one of the instances (lower than production, of course) would have been run a couple of weeks ago, and caused some other user's data to get corrupted. And then, a data script will have to be written to fix this issue. And I've seen this happening so much with this client that I have to ask. I've seen this happening at a moderate rate with other clients, but this one just seems to be out of order. If you're working with business applications that share a large amount of data by reading and writing to/from the same database, are "bad data issues" that common in your environment?

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• finding common prefix of array of strings

  - by bumperbox

  I have an array like this $sports = array( 'Softball - Counties', 'Softball - Eastern', 'Softball - North Harbour', 'Softball - South', 'Softball - Western' ); and i would like to find the longest common part of the string so in this instance, it would be 'Softball - '; I am thinking that I would follow the this process $i = 1; // loop to the length of the first string while ($i < strlen($sports[0]) { // grab the left most part up to i in length $match = substr($sports[0], 0, $i); // loop through all the values in array, and compare if they match foreach ($sports as $sport) { if ($match != substr($sport, 0, $i) { // didn't match, return the part that did match return substr($sport, 0, $i-1); } } // foreach // increase string length $i++; } // while // if you got to here, then all of them must be identical Questions is there a built in function or much simpler way of doing this ? for my 5 line array that is probably fine, but if i were to do several thousand line arrays, there would be a lot of overhead, so i would have to be move calculated with my starting values of $i, eg $i = halfway of string, if it fails, then $i/2 until it works, then increment $i by 1 until we succeed. so that we are doing the least number of comparisons to get a result If there a formula/algorithm out already out there for this kind of problem ? thanks alex

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• Custom Image Button and Radio/Toggle Button from Common Base Class

  - by Wonko the Sane

  Hi All, I would like to create a set of custom controls that are basically image buttons (it's a little more complex than that, but that's the underlying effect I'm going for) that I've seen a few different examples for. However, I would like to further extend that to also allow radio/toggle buttons. What I'd like to do is have a common abstract class called ImageButtonBase that has default implementations for ImageSource and Text, etc. That makes a regular ImageButton implementation pretty easy. The issue I am having is creating the RadioButton flavor of it. As I see it, there are at least three options: It would be easy to create something that derives from RadioButton, but then I can't use the abstract class I've created. I could change the abstract class to an interface, but then I lose the abstract implementations, and will in fact have duplication of code. I could derive from my abstract class, and re-implement the RadioButton-type properties and events (IsChecked, GroupName, etc.), but that certainly doesn't seem like a great idea. Note: I have seen http://stackoverflow.com/questions/2362641/how-to-get-a-group-of-toggle-buttons-to-act-like-radio-buttons-in-wpf, but what I want to do is a little more complex. I'm just wondering if anybody has an example of an implementation, or something that might be adapted to this kind of scenario. I can see pros and cons of each of the ideas above, but each comes with potential pitfalls. Thanks, wTs

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• Common methods/implementation across multiple WCF Services

  - by Rob

  I'm looking at implementing some WCF Services as part of an API for 3rd parties to access data within a product I work on. There are currently a set of services exposed as "classic" .net Web Services and I need to emulate the behaviour of these, at least in part. The existing services all have an AcquireAuthenticationToken method that takes a set of parameters (username, password, etc) and return a session token (represented as a GUID), which is then passed in on calls to any other method (There's also a ReleaseAuthenticationToken method, no guesses needed as to what that does!). What I want to do is implement multiple WCF services, such as: ProductData UserData and have both of these services share a common implementation of Acquire/Release. From the base project that is created by VS2k8, it would appear I will start with, per service: public class ServiceName : IServiceName { } public interface IServiceName { } Therefore my questions would be: Will WCF tolerate me adding a base class to this, public class ServiceName : ServiceBase, IServiceName, or does the fact that there's an interface involved mean that won't work? If "No it won't work" to Question 1, could I change IServiceName so it extends another interface, IServiceBase, thus forcing the presence of Acquire/Release methods, but then having to supply the implementation in each service. Are 1 and 2 both really bad ideas and there's actually a much better solution that, knowing next to nothing about WCF, I just haven't thought of?

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• Changing/Adding controls to the windows Open/Save common dialog

  - by ajp

  Is there a way of changing/adding to the windows Open/Save common dialog to add extra functionality? At work we have an area on a server with hundreds of 'jobfolders'- just ordinary windows folders created/managed automatically by the database application to house information about a job (emails/scanned faxes/Word docs/Spreadsheets/Photos etc) The folders are named by the job Number. I would like to expand the standard open/save dialog with a combobox which searches for jobfolders based on tags from the database, so that whatever my users are doing they can easily find their way to the correct jobfolder to find/save their work Connecting to the database and providing the functionality to search is no problem, but is there a way to add a combobox control (ideally with a keypress/keydown event) to the dialog? Or Create my own dialog and have it called/used in place of the standard one? i.e. from ANY app my dialog would be called allowing easy access to the jobfolders. If they are in outlook they can find a jobfolder quickly, if there are using Notepad they can still find the folder easily. This would mean a new unified way of finding jobfolders from any app. Ideally someone would know a way using VB/VB.net/C# but I'm guessing, if its possible, its probably going to be C++.

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• Common Properties: Consolidating Loan, Purchase, Inventory and Sale tables into one Transaction tabl

  - by Frank Computer

  Pawnshop Application: I have separate tables for Loan, Purchase, Inventory & Sales transactions. Each tables rows are joined to their respective customer rows by: customer.pk [serial] = loan.fk [integer]; = purchase.fk [integer]; = inventory.fk [integer]; = sale.fk [integer]; Since there are so many common properties within the four tables, I consolidated the four tables into one table called "transaction", where a column: transaction.trx_type char(1) {L=Loan, P=Purchase, I=Inventory, S=Sale} Scenario: A customer initially pawns merchandise, makes a couple of interest payments, then decides he wants to sell the merchandise to the pawnshop, who then places merchandise in Inventory and eventually sells it to another customer. I designed a generic transaction table where for example: transaction.main_amount DECIMAL(7,2) in a loan transaction holds the pawn amount, in a purchase holds the purchase price, in inventory and sale holds sale price. This is clearly a denormalized design, but has made programming alot easier and improved performance. Any type of transaction can now be performed from within one screen, without the need to change to different tables.

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• How can I roll back xserver-xorg-core and xserver-common?

  - by Ville Sundberg

  A recent update to Xorg broke my desktop, which now looks like this: http://i.imgur.com/PbBxh.jpg In short, the desktop background is not updating on the secondary display. (And if there is no secondary display, the primary display background stops updating.) Looking into the history, I found that this happened right after upgrading two packages: xserver-xorg-core xserver-common These were upgraded to 1.9.0-0ubuntu7.3. I'd like to downgrade these packages. How do I do that? I've checked that both have another version in the maverick repo: xserver-xorg-core: Installed: 2:1.9.0-0ubuntu7.3 Candidate: 2:1.9.0-0ubuntu7.3 Version table: *** 2:1.9.0-0ubuntu7.3 0 500 http://fi.archive.ubuntu.com/ubuntu/ maverick-updates/main amd64 Packages 100 /var/lib/dpkg/status 2:1.9.0-0ubuntu7 0 500 http://fi.archive.ubuntu.com/ubuntu/ maverick/main amd64 Packages However, apt won't let me downgrade them: ville@fluxx ~ % sudo apt-get install xserver-common=2:1.9.0-0ubuntu7 xserver-xorg-core=2:1.9.0-0ubuntu7 The following packages have unmet dependencies: xserver-xorg-core : Depends: xserver-xorg but it is not going to be installed E: Broken packages And this is the reason: ville@fluxx ~ % sudo apt-get install xserver-common=2:1.9.0-0ubuntu7 xserver-xorg-core=2:1.9.0-0ubuntu7 xserver-xorg-core The following packages have unmet dependencies: xserver-xorg-core : Depends: xserver-common (>= 2:1.9.0-0ubuntu7.3) but 2:1.9.0-0ubuntu7 is to be installed E: Broken packages Am I out of options here?

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