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delta-dictionary/dictionary with revision awareness in python?

- by shabbychef

I am looking to create a dictionary with 'roll-back' capabilities in python. The dictionary would start with a revision number of 0, and the revision would be bumped up only by explicit method call. I do not need to delete keys, only add and update key,value pairs, and then roll back. I will never need to 'roll forward', that is, when rolling the dictionary back, all the newer revisions can be discarded, and I can start re-reving up again. thus I want behaviour like: >>> rr = rev_dictionary() >>> rr.rev 0 >>> rr["a"] = 17 >>> rr[('b',23)] = 'foo' >>> rr["a"] 17 >>> rr.rev 0 >>> rr.roll_rev() >>> rr.rev 1 >>> rr["a"] 17 >>> rr["a"] = 0 >>> rr["a"] 0 >>> rr[('b',23)] 'foo' >>> rr.roll_to(0) >>> rr.rev 0 >>> rr["a"] 17 >>> rr.roll_to(1) Exception ... Just to be clear, the state associated with a revision is the state of the dictionary just prior to the roll_rev() method call. thus if I can alter the value associated with a key several times 'within' a revision, and only have the last one remembered. I would like a fairly memory-efficient implementation of this: the memory usage should be proportional to the deltas. Thus simply having a list of copies of the dictionary will not scale for my problem. One should assume the keys are in the tens of thousands, and the revisions are in the hundreds of thousands. We can assume the values are immutable, but need not be numeric. For the case where the values are e.g. integers, there is a fairly straightforward implementation (have a list of dictionaries of the numerical delta from revision to revision). I am not sure how to turn this into the general form. Maybe bootstrap the integer version and add on an array of values? all help appreciated.

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WPF TextBox DataBind on EnterKey press

- by Jobi Joy

The default DataBinding on TextBox is TwoWay and it commits the text to the Property only when TextBox lost its focus. Is there any easy XAML way exists to make the DataBinding Happens when I press Enter Key on the TextBox?. I know it is pretty easy to do in the code behind, but imagine if this textBox is inside some complex DataTemplate.

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Getting State of Modifier Keys Compact Framework

- by CDM

How can I get the state of a modifier key using VB.NET on the Compact Framework, in this case Windows Mobile 6.1. I want to be able to determine if the following keys are pressed or locked: Shift CTRL ALT and for the Psion Teklogix machines Orange Blue Although I may be able to work this out, if I can determine the others. I want to create my own on-screen indicator panel and want to poll the keys, not using events. Thanks Colin

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XMLRPC Response Using ws-xmlrpc

- by Dave

Anyone have experience parsing complex response types using ws-xmlrpc? The service returns a HashMap with one of the values an Array, when I request the key of the array from the hashmap, java just returns "java.lang.Object". How do I access the contents of the array? Any ideas? Thanks in advance for your input.

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Changing a column collation

- by Stefan

Hey there, I have a database already set up. I am trying to change the collation to case sensitive on my username column so it restricts login parameters to what they signed up with. However I keep getting this: #1025 - Error on rename of './yebutno_ybn/#sql-76dc_8581dc' to './yebutno_ybn/user' (errno: 150) there is foreign key constraints due to related tables.... any ideas? this will save me a lot of hassle with the php side of things! Thanks, Stefan

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GQL query help - How can I write a query with where clause in GQL ? I am using google appengine data

- by srivigneshwar

I have three records in a table example: *Usernames* *email* *city* Nick [email protected] London Vikky [email protected] Paris Lisa [email protected] Sydney Now I want to get specific record keeping email ID as a key , SQL query may be like this select * from table1 where email = "[email protected]" What is the equivalent GQL query for the above ??

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Need an example about console application which user can interact console window

- by Lu Lu

Hello everyone, I need write a console application like as hiren boot screen: User can input a arrow key or a number for choosing. When a menu item is selected, I will fill a background for the selected menu item. Please give me some guideline or example. Thanks.

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PyCharm: How to skip over closing braces / brackets / parentheses?

- by Withnail

This is driving me nuts. I can't get the auto-indentations to work properly unless I use the automatic closing of braces, et al (which I don't like), and I see no option allowing one to skip over/out. Eclipse has a configuration option for this, and Visual Studio doesn't auto-close everything by default, but rather formats the code block after manually entering the closing brace (which I think is perfect). Surely there's something apart from going all the way over to the "End" key?

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encrypt- decrypt with AES using C/C++

- by iassael

Hi! How can I encrypt decrypt a file with a 256 key AES in c or c++? Which library do you suggest? Thank you!

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Cannot create a row of size 8074 which is greater than the allowable maximum row size of 8060.

- by Lieven Cardoen

I have already asked a question about this, but the problems keeps on hitting me ;-) I have two tables that are identical. I want to add a xml column. In the first table this is no problem, but in the second table I get the sqlException (title). However, apart from the data in it, they are the same. So, can I get the sqlException because of data in the table? I have also tried to store the field off page with EXEC sp_tableoption 'dbo.PackageSessionNodesFinished', 'large value types out of row', 1 but without any succes. The same SqlException keeps coming. First table: PackageSessionNodes CREATE TABLE [dbo].[PackageSessionNodes]( [PackageSessionNodeId] [int] IDENTITY(1,1) NOT NULL, [PackageSessionId] [int] NOT NULL, [TreeNodeId] [int] NOT NULL, [Duration] [int] NULL, [Score] [float] NOT NULL, [ScoreMax] [float] NOT NULL, [Interactions] [xml] NOT NULL, [BrainTeaser] [bit] NULL, [DateCreated] [datetime] NULL, [CompletionStatus] [int] NOT NULL, [ReducedScore] [float] NOT NULL, [ReducedScoreMax] [float] NOT NULL, [ContentInteractions] [xml] NOT NULL, CONSTRAINT [PK_PackageSessionNodes] PRIMARY KEY CLUSTERED ( [PackageSessionNodeId] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY] Second table: PackageSessionNodesFinished CREATE TABLE [dbo].[PackageSessionNodesFinished]( [PackageSessionNodeFinishedId] [int] IDENTITY(1,1) NOT NULL, [PackageSessionId] [int] NOT NULL, [TreeNodeId] [int] NOT NULL, [Duration] [int] NULL, [Score] [float] NOT NULL, [ScoreMax] [float] NOT NULL, [Interactions] [xml] NOT NULL, [BrainTeaser] [bit] NULL, [DateCreated] [datetime] NULL, [CompletionStatus] [int] NOT NULL, [ReducedScore] [float] NOT NULL, [ReducedScoreMax] [float] NOT NULL, [ContentInteractions] [xml] NULL, CONSTRAINT [PK_PackageSessionNodesFinished] PRIMARY KEY CLUSTERED ( [PackageSessionNodeFinishedId] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY] First script I tried to run (First two ALTER TABLE work fine, the third crashes on SqlException) ALTER TABLE dbo.PackageSessionNodes ADD ContentInteractions xml NOT NULL CONSTRAINT DF_PackageSessionNodes_ContentInteractions DEFAULT (('<contentinteractions/>')); ALTER TABLE dbo.PackageSessionNodes DROP CONSTRAINT DF_PackageSessionNodes_ContentInteractions ALTER TABLE dbo.PackageSessionNodesFinished ADD ContentInteractions xml NOT NULL CONSTRAINT DF_PackageSessionNodesFinished_ContentInteractions DEFAULT (('<contentinteractions/>')); ALTER TABLE dbo.PackageSessionNodesFinished DROP CONSTRAINT DF_PackageSessionNodesFinished_ContentInteractions Second script I tried to run with the same result as previous script: EXEC sp_tableoption 'dbo.PackageSessionNodes', 'large value types out of row', 1 ALTER TABLE dbo.PackageSessionNodes ADD ContentInteractions xml NOT NULL CONSTRAINT DF_PackageSessionNodes_ContentInteractions DEFAULT (('<contentinteractions/>')); ALTER TABLE dbo.PackageSessionNodes DROP CONSTRAINT DF_PackageSessionNodes_ContentInteractions EXEC sp_tableoption 'dbo.PackageSessionNodesFinished', 'large value types out of row', 1 ALTER TABLE dbo.PackageSessionNodesFinished ADD ContentInteractions xml NOT NULL CONSTRAINT DF_PackageSessionNodesFinished_ContentInteractions DEFAULT (('<contentinteractions/>')); ALTER TABLE dbo.PackageSessionNodesFinished DROP CONSTRAINT DF_PackageSessionNodesFinished_ContentInteractions Now, In PackageSessionNodes there are 234 records, in PackageSessionNodesFinished there are 4256946 records. Really would appreciate some help here as I'm stuck.

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Can XmlMassUpdate be used to delete an attribute?

- by tlianza

For example, I have this line: <forms loginUrl="/redirecttosignin.aspx" name="NAME_HERE" requireSSL="false" timeout="60" domain=".blah.com" /> And I want to delete the "name" attribute altogether. I know I can do this to blank it: <forms xmu:key="loginUrl" loginUrl="/redirecttosignin.aspx" name="" /> But, I literally want to get the name attribute out, and leave the other attributes in tact. Couldn't find any examples of that. Thanks!

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Bluepay Security Error

- by Shima

Hi all, I am trying to implement bluepay payment service in my PHP project,but I'm getting a return message of "Security Error". Here's the exact debug page results: Response: STATUS=E&MESSAGE=SECURITY%20ERROR Trans Id: Status: E AVS Resp: CVV2 Resp: Auth Code: Message: SECURITY ERROR Rebid: I'm using the correct merchant ID and Secret Key. Does anyone has any idea!!!! Please help me!

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Is there any NoSQL that is ACID compliant?

- by JustinT

Is there any NoSQL that is ACID compliant? (Or is that even possible with NoSQL given it's just a bunch of loosely coupled key-value pairs.)

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Set attributes from dictionary in python

- by Oscar Reyes

Is it possible to create an object from a dictionary in python in such a way that each key is an attribute of that object? Something like this: dict = { 'name': 'Oscar', 'lastName': 'Reyes', 'age':32 } e = Employee( dict ) print e.name # Oscar print e.age + 10 # 42 I think it would be pretty much the inverse of this question: Python dictionary from an object's fields

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What is wrong with my PHP/MySQL code?

- by James

I am building a navigation menu which lists all my categories and subcategories. The problem is it returns only one of these and not all. I have the categories echoed inside the while loop so I'm not sure why it's only showing one result and not all: <?php $query = mysql_query("SELECT * FROM categories_parent"); while ($row = mysql_fetch_assoc($query)) { $id = $row['id']; $name = $row['name']; $slug = $row['slug']; $childStatus = $row['child_status']; // if has child categories if ($childStatus == "1") { echo "<li class='dir'><a href='category.php?slug=$slug'>$name</a>"; echo "<ul id='dropdown'>"; $query = mysql_query("SELECT * FROM categories_child WHERE parent=$id"); while ($row = mysql_fetch_assoc($query)) { $id = $row['id']; $name = $row['name']; $slug = $row['slug']; echo "<li><a href='category.php?slug=$slug'>$name</a></li>"; } echo "</ul>"; echo "</li>"; } // if singular parent else { echo "<li><a href='category.php?slug=$slug'>$name</a></li>"; } } ?> My database tables: -- -- Table structure for table `categories_child` -- CREATE TABLE IF NOT EXISTS `categories_child` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(1000) NOT NULL, `slug` varchar(1000) NOT NULL, `parent` int(11) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=139 ; -- -- Dumping data for table `categories_child` -- INSERT INTO `categories_child` (`id`, `name`, `slug`, `parent`) VALUES (138, 'Britney Spears', 'category/celiberties/britney-spears/', 137), (136, 'Tigers', 'category/animals/tigers/', 136), (137, 'Horses', 'category/animals/horses/', 136), (135, 'Lions', 'category/animals/lions/', 136); -- -- Table structure for table `categories_parent` -- CREATE TABLE IF NOT EXISTS `categories_parent` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(1000) NOT NULL, `slug` varchar(1000) NOT NULL, `child_status` int(1) NOT NULL DEFAULT '0', PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=139 ; -- -- Dumping data for table `categories_parent` -- INSERT INTO `categories_parent` (`id`, `name`, `slug`, `child_status`) VALUES (137, 'Celiberties', 'category/celiberties/', 1), (138, 'TV Shows', 'category/tv-shows/', 0), (136, 'Animals', 'category/animals/', 1);

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UIKeyBoard Return Button UIReturnKeyDone

- by Dave

textfield.returnKeyTYpe = UIReturnKeyDone So the above makes my Return button on the keyboard to say Done. I have seen Apps with Blue color button on the UIKeyBoard. Is that simple enough to do? How do I change the background color of the Return key?

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WPF Style - value based on another control's property

- by David Ward

Is it possible to set the BorderBrush property in a style, to the value of the BorderBrush property of an instance of another control? Something like: <Style x:Key="{x:Type Controls:TimePicker}" TargetType="Controls:TimePicker"> <Setter Property="BorderBrush" Value="[ElementName=txtText Property=BorderBrush]"/> </Style> The reason for this is that I'm using Infragistics controls that have a "Theme" that can be changed and I want my custom control to change border style at the same time.

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add a start up item via command line (mac)

- by adam n

How can I add a start up item via command line on a mac? From googling, I know you have to edit ~/Library/Preferences/com.apple.loginitems.plist using defaults write com.apple.loginitems [key] [value] but i'm not sure exactly which things to edit.

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How do I use m2crypto to validate a X509 certificate chain in a non-SSL setting

- by Brock Pytlik

I'm trying to figure out how to, using m2crypto, validate the chain of trust from a public key version of a X509 certificate back to one of a set of known root CA's when the chain may be arbitrarily long. The SSL.Context module looks promising except that I'm not doing this in the context of a SSL connection and I can't see how the information passed to load_verify_locations is used. Essentially, I'm looking for the interface that's equivalent to: openssl verify pub_key_x509_cert Is there something like that in m2crypto? Thanks.

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Generic styles for DataGridTemplateColumn Headers & Cells

- by user557765

I am struggling to define templates for my DataGrid columns. Here is the code that I have working at the moment: <t:DataGrid.Columns> <t:DataGridTemplateColumn Width="75" > <t:DataGridTemplateColumn.HeaderTemplate> <DataTemplate> <TextBlock Style="{StaticResource FieldNameVertical}" Text="Date" /> </DataTemplate> </t:DataGridTemplateColumn.HeaderTemplate> <t:DataGridTemplateColumn.CellTemplate> <DataTemplate> <TextBlock Style="{StaticResource FieldValue}" Text="{Binding ModifiedDate, StringFormat='{}{0:MM/dd/yyyy}'}" /> </DataTemplate> </t:DataGridTemplateColumn.CellTemplate> </t:DataGridTemplateColumn> .. .. .. </t:DataGrid.Columns> I would like to define HeaderTemplate & CellTemplate as reusable styles -- so that each column would be as brief as something like this: <t:DataGrid.Resources> <DataTemplate x:Key="dgHeaderStyle"> <TextBlock Style="{StaticResource FieldNameVertical}" Text="{Binding}" /> </DataTemplate> <DataTemplate x:Key="dgCellStyle"> <TextBlock Style="{StaticResource FieldValue}" Text="{Binding}" /> </DataTemplate> </t:DataGrid.Resources> <t:DataGrid.Columns> <t:DataGridTemplateColumn Width="75" Header="Date" Binding="{Binding ModifiedDate, StringFormat='{}{0:MM/dd/yyyy}'}" HeaderTemplate="{StaticResource dgHeaderStyle}" CellTemplate="{StaticResource dgCellStyle}" /> <t:DataGridTemplateColumn Width="100" Header="Dealer" HeaderTemplate="{StaticResource dgHeaderStyle}" CellTemplate="{StaticResource dgCellStyle}" /> ... </t:DataGrid.Columns> Every attempt I make has failed. I had hoped to implement something like the "solution" snippet in the initial entry of WPF DataGrid HeaderTemplate Mysterious Padding. However, I can't seem to adapt it to what I'm doing.

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ConfigurationManager.AppSettings is empty?

- by Mattousai

Hello All, I have a VS2008 ASP.NET Web Service Application running on the local IIS of my XP machine. A separate project in the same solution uses test methods to invoke the WS calls, and run their processes. When I added a web reference to the WS App, VS2008 created a Settings.settings file in the Properties folder to store the address of the web reference. This process also created a new section in the Web.config file called applicationSettings to store the values from Settings.settings When my application attempts to retrieve configuration values from the appSettings section of the Web.config file, via ConfigurationManager.AppSettings[key], all values are null and AppSettings.AllKeys.Length is always zero. I even reverted the Web.config file to before the web reference was added, and made sure it was exactly the same as a system-generated web.config file for a new project that works fine. After comparing the reverted Web.config and a new Web.config, I addded one simple value in the appSettings section, and still no luck with ConfigurationManager.AppSettings[key]. Here is the reverted Web.config that cannot be read from <?xml version="1.0"?> <configuration> <configSections> <sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/> <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> <section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere" /> <section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" /> <section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" /> <section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" /> </sectionGroup> </sectionGroup> </sectionGroup> </configSections> <appSettings> <add key="testkey" value="testvalue"/> </appSettings> <connectionStrings/> <system.web>  <compilation debug="false"> <assemblies> <add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/> <add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/> <add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> <add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/> </assemblies> </compilation>  <authentication mode="Windows" />  <pages> <controls> <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> <add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> </controls> </pages> <httpHandlers> <remove verb="*" path="*.asmx"/> <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> <add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validate="false"/> </httpHandlers> <httpModules> <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> </httpModules> </system.web> <system.codedom> <compilers> <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" type="Microsoft.CSharp.CSharpCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"> <providerOption name="CompilerVersion" value="v3.5"/> <providerOption name="WarnAsError" value="false"/> </compiler> </compilers> </system.codedom>  <system.webServer> <validation validateIntegratedModeConfiguration="false"/> <modules> <remove name="ScriptModule" /> <add name="ScriptModule" preCondition="managedHandler" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> </modules> <handlers> <remove name="WebServiceHandlerFactory-Integrated"/> <remove name="ScriptHandlerFactory" /> <remove name="ScriptHandlerFactoryAppServices" /> <remove name="ScriptResource" /> <add name="ScriptHandlerFactory" verb="*" path="*.asmx" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> <add name="ScriptHandlerFactoryAppServices" verb="*" path="*_AppService.axd" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> <add name="ScriptResource" preCondition="integratedMode" verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> </handlers> </system.webServer> <runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <dependentAssembly> <assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35"/> <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="System.Web.Extensions.Design" publicKeyToken="31bf3856ad364e35"/> <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/> </dependentAssembly> </assemblyBinding> </runtime> </configuration> Has anyone experienced this, or know how to solve the problem? TIA -Matt

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Edit source files with custom maven archetype

- by Scobal

I have created a customer maven archetype and have it setup with some custom requiredProperties: <requiredProperties> <requiredProperty key="classPrefix" /> </requiredProperties> I can use that property to name a file, like so: __classPrefix__Config.java My question is can I use that property inside the file. I've tried the following two variations but neither work: public class ${classPrefix}Config public class __classPrefix__Config

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How to optimize my PageRank calculation?

- by asmaier

In the book Programming Collective Intelligence I found the following function to compute the PageRank: def calculatepagerank(self,iterations=20): # clear out the current PageRank tables self.con.execute("drop table if exists pagerank") self.con.execute("create table pagerank(urlid primary key,score)") self.con.execute("create index prankidx on pagerank(urlid)") # initialize every url with a PageRank of 1.0 self.con.execute("insert into pagerank select rowid,1.0 from urllist") self.dbcommit() for i in range(iterations): print "Iteration %d" % i for (urlid,) in self.con.execute("select rowid from urllist"): pr=0.15 # Loop through all the pages that link to this one for (linker,) in self.con.execute("select distinct fromid from link where toid=%d" % urlid): # Get the PageRank of the linker linkingpr=self.con.execute("select score from pagerank where urlid=%d" % linker).fetchone()[0] # Get the total number of links from the linker linkingcount=self.con.execute("select count(*) from link where fromid=%d" % linker).fetchone()[0] pr+=0.85*(linkingpr/linkingcount) self.con.execute("update pagerank set score=%f where urlid=%d" % (pr,urlid)) self.dbcommit() However, this function is very slow, because of all the SQL queries in every iteration >>> import cProfile >>> cProfile.run("crawler.calculatepagerank()") 2262510 function calls in 136.006 CPU seconds Ordered by: standard name ncalls tottime percall cumtime percall filename:lineno(function) 1 0.000 0.000 136.006 136.006 <string>:1(<module>) 1 20.826 20.826 136.006 136.006 searchengine.py:179(calculatepagerank) 21 0.000 0.000 0.528 0.025 searchengine.py:27(dbcommit) 21 0.528 0.025 0.528 0.025 {method 'commit' of 'sqlite3.Connecti 1 0.000 0.000 0.000 0.000 {method 'disable' of '_lsprof.Profiler 1339864 112.602 0.000 112.602 0.000 {method 'execute' of 'sqlite3.Connec 922600 2.050 0.000 2.050 0.000 {method 'fetchone' of 'sqlite3.Cursor' 1 0.000 0.000 0.000 0.000 {range} So I optimized the function and came up with this: def calculatepagerank2(self,iterations=20): # clear out the current PageRank tables self.con.execute("drop table if exists pagerank") self.con.execute("create table pagerank(urlid primary key,score)") self.con.execute("create index prankidx on pagerank(urlid)") # initialize every url with a PageRank of 1.0 self.con.execute("insert into pagerank select rowid,1.0 from urllist") self.dbcommit() inlinks={} numoutlinks={} pagerank={} for (urlid,) in self.con.execute("select rowid from urllist"): inlinks[urlid]=[] numoutlinks[urlid]=0 # Initialize pagerank vector with 1.0 pagerank[urlid]=1.0 # Loop through all the pages that link to this one for (inlink,) in self.con.execute("select distinct fromid from link where toid=%d" % urlid): inlinks[urlid].append(inlink) # get number of outgoing links from a page numoutlinks[urlid]=self.con.execute("select count(*) from link where fromid=%d" % urlid).fetchone()[0] for i in range(iterations): print "Iteration %d" % i for urlid in pagerank: pr=0.15 for link in inlinks[urlid]: linkpr=pagerank[link] linkcount=numoutlinks[link] pr+=0.85*(linkpr/linkcount) pagerank[urlid]=pr for urlid in pagerank: self.con.execute("update pagerank set score=%f where urlid=%d" % (pagerank[urlid],urlid)) self.dbcommit() This function is 20 times faster (but uses a lot more memory for all the temporary dictionaries) because it avoids the unnecessary SQL queries in every iteration: >>> cProfile.run("crawler.calculatepagerank2()") 64802 function calls in 6.950 CPU seconds Ordered by: standard name ncalls tottime percall cumtime percall filename:lineno(function) 1 0.004 0.004 6.950 6.950 <string>:1(<module>) 1 1.004 1.004 6.946 6.946 searchengine.py:207(calculatepagerank2 2 0.000 0.000 0.104 0.052 searchengine.py:27(dbcommit) 23065 0.012 0.000 0.012 0.000 {meth 'append' of 'list' objects} 2 0.104 0.052 0.104 0.052 {meth 'commit' of 'sqlite3.Connection 1 0.000 0.000 0.000 0.000 {meth 'disable' of '_lsprof.Profiler' 31298 5.809 0.000 5.809 0.000 {meth 'execute' of 'sqlite3.Connectio 10431 0.018 0.000 0.018 0.000 {method 'fetchone' of 'sqlite3.Cursor' 1 0.000 0.000 0.000 0.000 {range} But is it possible to further reduce the number of SQL queries to speed up the function even more?

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NHibernate many-to-many with composite element

- by E1

Hello everyone. I encountered the following problem. In my application uses the entities Owner and Area binding as many to many. public class Area : DomainObject<int> { private ISet<OwnersPeriod> _owners = new HashedSet<OwnersPeriod>(); public ICollection<OwnersPeriod> Owners { get { return _owners; } set { Check.Require(value != null); _owners = new HashedSet<OwnersPeriod>(value); } } } Table Owner2Area has the following fields: CREATE TABLE [dbo].[Owner2Area]( [ID] [int] IDENTITY(1,1) NOT NULL, [IDOwner] [int] NOT NULL, [IDArea] [int] NOT NULL, [FirstDate] [datetime] NOT NULL, [LastDate] [datetime] NULL, CONSTRAINT [PK_Owner2Area] PRIMARY KEY CLUSTERED) Therefore corresponds to the class OwnersPeriod public class OwnersPeriod { private Owner _member; private Area _area; public Owner Owner { get {...} set{...} } public Area Area { get { ... } set { ... } } public DateTime FirstDate { get; set; } public DateTime? LastDate { get; set; } } I wrote mappings <class lazy="false" name="Core.Domain.Area, Core" table="Areas"> ... <set name="Owners" table="Owner2Area" inverse="true" lazy="true" > <key column="IDArea"/> <composite-element class="Core.Domain.OwnersPeriod, Core" > <parent name="Area" /> <property name="FirstDate" type="datetime"/> <property name="LastDate" type="datetime"/> <many-to-one name="Owner" class="Core.Domain.Owner, Core" column="IDOwner"/> </composite-element> </set> </class> For each area existing data are successfully loaded into Owners, but when I add new record in Owner2Area through CreateSQLQuery, these data are not updated for instance of area. If I re-opened the form and got all areas, added link successfully loaded into the collection. How can be forced to load added thus recording of relation many-to-many? Nhibernate v.2.0.1, db MSSQL 2005

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Linq-to-SQL Grouping not ordering correctly

- by Grant

Hi can someone help me convert this tsql statement into c# linq2sql? select [series] from table group by [series] order by max([date]) desc This is what i have so far - the list is not in correct order.. var x = from c in db.Table orderby c.Date descending group c by c.Series into d select d.Key;

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