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  • Is it professional to have funny looking logging messages

    - by JCH
    Hi, Recently I have joined a new project team where in the java application logs have logged messages in a non-formal way[can't think of suitable word]. here how they look :-) <message> for info messages :-| <message> for warn :-( <message> for error besides there's also ASCII art drawing , different one for each log when that particular service starts up or is killed .And there many more styles for certain application events. iam not sure if it has any significant overhead on the application or not. I would like to ask you folks if you come across such unique styles of logging messages or do you also practice any styles.what is your opinion about it. BR /jon

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  • Django IN query as a string result - invalid literal for int() with base 10

    - by bmelton
    Trying to query a 'Favorites' model to get a list of items a user has favorited, and then querying against a different model to get the objects back from that query to present to the template, but I'm getting an error: "invalid literal for int() with base 10" Looking over all of the other instances of that error, I couldn't find any in which the asker actually wanted to work with a comma separated list of integers, so I'm kind of at a loss. Model class Favorite(models.Model): # key should be the model name, id is the model.id, and user is the User object. key = models.CharField(max_length=255, unique=True) val = models.IntegerField(default=0) user = models.ForeignKey(User) class Admin: list_display = ('key', 'id', 'user') View def index(request): favorites = Favorite.objects.filter(key='blog', user=request.user.pk) values = "" for favorite in favorites: values += "%s," % favorite.val #values = "[%s]" % values blogs = Blog.objects.filter(pk__in=values) return render_to_response('favorite/index.html', { "favorites" : favorites, "blogs" : blogs, "values" : values, }, context_instance=RequestContext(request) ) enter code here

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  • extending django usermodel

    - by imran-glt
    Hi i am trying to create a signup form for my django app. for this i have extended the user model. This is my Forms.py from contact.models import register from django import forms from django.contrib import auth class registerForm(forms.ModelForm): class Meta: model=register fields = ('latitude', 'longitude', 'status') class Meta: model = auth.models.User # this gives me the User fields fields = ('username', 'first_name', 'last_name', 'email') and this is my model.py from django.db import models from django.contrib.auth.models import User STATUS_CHOICES = ( ('Online', 'Online.'), ('Busy', 'Busy.'), ('AppearOffline', 'AppearOffline.'),) class register(models.Model): user = models.ForeignKey('auth.User', unique = True) latitude = models.DecimalField(max_digits=8, decimal_places=6) longitude = models.DecimalField(max_digits=8, decimal_places=6) status = models.CharField(max_length=8,choices=STATUS_CHOICES, blank= True, null=True) i dont know where i am making a mistake. the users passwords are not accepted at the login and the latitude and logitude are not saved against the created user user. i am fiarly new to django and dont know what to do any body have any solution .?

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  • Multiple MCs, Single Listener, AsBroadcaster

    - by Brett
    I'm currently working trying to have multiple MCs inside a container MC which when they mini MCs are clicked will broadcast a message so that I can act upon them. This would be simple in AS 3 as it would be mc.addEventListener(MouseEvent.CLICK, obj); however, this is AS 2 and so I am semi-forced to use the broadcastMessage('myMessage'); and mc.addListener(obj); event handler. The main problem is that the broadcaster isn't broadcasting any messages. The second problem is that there are 5 MCs and when I click one of them, I get 5 trace messages about the click. I can't seem to keep the MC clicks unique even though they are all given separate instance names vie the properties panel. Any help would be appreciated. A link to my code is here (pastie.org #481511). Can you see anything wrong?

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  • Has glassfish 2.1.1 a bug handling http request and handle them twice?

    - by marabol
    I'm using glassfish 2.1.1. I've watched a mysterious http/webservice-call handling. It seams an http request is handled by two different threads. After http basic authentication the first thread is faster. Persisting some data end, but writing response fails in glassfish internal. The second thread fails, because it tries to persist identical data and there are (unique) constrain failures. The response (the failure) of second thread was delivered to client. I don't won't discuss the behavior with the unique constrain failure. I've improve the webservice, so it can handle this better, because it could be happen anytime, that the client send the ws call a second time. But I think, glassfish 2.1.1 has an bug handling http request. Is there any known issue? Have I done an mistake? [#|2010-03-22T10:40:54.150+0000|INFO|sun-appserver2.1|javax.enterprise.system.core|_ThreadID=10;_ThreadName=main;|Starting Sun GlassFish Enterprise Server v2.1.1 ((v2.1 Patch06)(9.1_02 Patch12)) (build b31g-fcs) ...|#] ... [#|2010-03-22T11:18:44.220+0000|FINE|sun-appserver2.1|mypackage.module.security.auth.realm.YaJdbcRealm|_ThreadID=26;_ThreadName=httpSSLWorkerThread-8080-1;ClassName=mypackage.module.security.auth.realm.YaJdbcRealm;MethodName=authenticate;_RequestID=4d8f23e9-5106-4d64-b865-1638d7075bde;|JDBC authenticate successful for: 8002 groups:[roleUser]|#] [#|2010-03-22T11:18:44.220+0000|FINE|sun-appserver2.1|mypackage.module.security.auth.login.YaJdbcLoginModule|_ThreadID=26;_ThreadName=httpSSLWorkerThread-8080-1;ClassName=mypackage.module.security.auth.login.YaJdbcLoginModule;MethodName=authenticate;_RequestID=4d8f23e9-5106-4d64-b865-1638d7075bde;|JDBC login succeeded for: 8002 groups:[roleUser]|#] [#|2010-03-22T11:18:44.220+0000|FINE|sun-appserver2.1|mypackage.module.security.auth.realm.YaJdbcRealm|_ThreadID=39;_ThreadName=httpSSLWorkerThread-8080-2;ClassName=mypackage.module.security.auth.realm.YaJdbcRealm;MethodName=authenticate;_RequestID=4ca7e3e5-5ab7-41ec-b3c9-d9260b1164c9;|JDBC authenticate successful for: 8002 groups:[roleUser]|#] [#|2010-03-22T11:18:44.220+0000|FINE|sun-appserver2.1|mypackage.module.security.auth.login.YaJdbcLoginModule|_ThreadID=39;_ThreadName=httpSSLWorkerThread-8080-2;ClassName=mypackage.module.security.auth.login.YaJdbcLoginModule;MethodName=authenticate;_RequestID=4ca7e3e5-5ab7-41ec-b3c9-d9260b1164c9;|JDBC login succeeded for: 8002 groups:[roleUser]|#] [#|2010-03-22T11:18:44.220+0000|FINE|sun-appserver2.1|mypackage.MyWebService|_ThreadID=26;_ThreadName=httpSSLWorkerThread-8080-1;ClassName=mypackage.MyWebService;MethodName=enqueue;_RequestID=4d8f23e9-5106-4d64-b865-1638d7075bde;|Received WebService call to enqueue() from client 59|#] [#|2010-03-22T11:18:44.220+0000|FINE|sun-appserver2.1|mypackage.MyWebService|_ThreadID=39;_ThreadName=httpSSLWorkerThread-8080-2;ClassName=mypackage.MyWebService;MethodName=enqueue;_RequestID=4ca7e3e5-5ab7-41ec-b3c9-d9260b1164c9;|Received WebService call to enqueue() from client 59|#] ... [#|2010-03-22T11:18:44.267+0000|FINE|sun-appserver2.1|mypackage.MyWebService|_ThreadID=26;_ThreadName=httpSSLWorkerThread-8080-1;ClassName=mypackage.MyWebService;MethodName=enqueue;_RequestID=4d8f23e9-5106-4d64-b865-1638d7075bde;|Successfully finished WebService call to enqueue() from client 59|#] [#|2010-03-22T11:18:44.329+0000|WARNING|sun-appserver2.1|javax.enterprise.system.container.ejb|_ThreadID=26;_ThreadName=httpSSLWorkerThread-8080-1;_RequestID=4d8f23e9-5106-4d64-b865-1638d7075bde;|invocation error on ejb endpoint MyWebService at /MyWebserviceService/MyWebservice : com.sun.xml.stream.XMLStreamException2 javax.xml.ws.WebServiceException: com.sun.xml.stream.XMLStreamException2 at com.sun.xml.ws.encoding.StreamSOAPCodec.encode(StreamSOAPCodec.java:111) at com.sun.xml.ws.encoding.SOAPBindingCodec.encode(SOAPBindingCodec.java:281) at com.sun.xml.ws.transport.http.HttpAdapter.encodePacket(HttpAdapter.java:320) at com.sun.xml.ws.transport.http.HttpAdapter.access$100(HttpAdapter.java:93) at com.sun.xml.ws.transport.http.HttpAdapter$HttpToolkit.handle(HttpAdapter.java:454) at com.sun.xml.ws.transport.http.HttpAdapter.handle(HttpAdapter.java:244) at com.sun.xml.ws.transport.http.servlet.ServletAdapter.handle(ServletAdapter.java:135) at com.sun.enterprise.webservice.Ejb3MessageDispatcher.handlePost(Ejb3MessageDispatcher.java:113) at com.sun.enterprise.webservice.Ejb3MessageDispatcher.invoke(Ejb3MessageDispatcher.java:87) at com.sun.enterprise.webservice.EjbWebServiceServlet.dispatchToEjbEndpoint(EjbWebServiceServlet.java:231) at com.sun.enterprise.webservice.EjbWebServiceServlet.service(EjbWebServiceServlet.java:157) at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) at com.sun.enterprise.web.AdHocContextValve.invoke(AdHocContextValve.java:114) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587) at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:87) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:222) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1093) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:166) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1093) at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:291) at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:666) at com.sun.enterprise.web.connector.grizzly.comet.CometEngine.executeServlet(CometEngine.java:616) at com.sun.enterprise.web.connector.grizzly.comet.CometEngine.handle(CometEngine.java:362) at com.sun.enterprise.web.connector.grizzly.comet.CometAsyncFilter.doFilter(CometAsyncFilter.java:84) at com.sun.enterprise.web.connector.grizzly.async.DefaultAsyncExecutor.invokeFilters(DefaultAsyncExecutor.java:189) at com.sun.enterprise.web.connector.grizzly.async.DefaultAsyncExecutor.interrupt(DefaultAsyncExecutor.java:164) at com.sun.enterprise.web.connector.grizzly.async.AsyncProcessorTask.doTask(AsyncProcessorTask.java:92) at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:264) at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106) Caused by: com.sun.xml.stream.XMLStreamException2 at com.sun.xml.stream.writers.XMLStreamWriterImpl.flush(XMLStreamWriterImpl.java:416) at com.sun.xml.ws.encoding.StreamSOAPCodec.encode(StreamSOAPCodec.java:109) ... 36 more Caused by: ClientAbortException: java.nio.channels.ClosedChannelException at org.apache.coyote.tomcat5.OutputBuffer.doFlush(OutputBuffer.java:385) at org.apache.coyote.tomcat5.OutputBuffer.flush(OutputBuffer.java:351) at org.apache.coyote.tomcat5.CoyoteOutputStream.flush(CoyoteOutputStream.java:176) at com.sun.xml.stream.writers.UTF8OutputStreamWriter.flush(UTF8OutputStreamWriter.java:153) at com.sun.xml.stream.writers.XMLStreamWriterImpl.flush(XMLStreamWriterImpl.java:414) ... 37 more Caused by: java.nio.channels.ClosedChannelException at sun.nio.ch.SocketChannelImpl.ensureWriteOpen(SocketChannelImpl.java:126) at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:324) at com.sun.enterprise.web.connector.grizzly.OutputWriter.flushChannel(OutputWriter.java:91) at com.sun.enterprise.web.connector.grizzly.OutputWriter.flushChannel(OutputWriter.java:66) at com.sun.enterprise.web.connector.grizzly.SocketChannelOutputBuffer.flushChannel(SocketChannelOutputBuffer.java:172) at com.sun.enterprise.web.connector.grizzly.async.AsynchronousOutputBuffer.flushChannel(AsynchronousOutputBuffer.java:81) at com.sun.enterprise.web.connector.grizzly.SocketChannelOutputBuffer.flushBuffer(SocketChannelOutputBuffer.java:205) at com.sun.enterprise.web.connector.grizzly.async.AsynchronousOutputBuffer.flushBuffer(AsynchronousOutputBuffer.java:114) at com.sun.enterprise.web.connector.grizzly.SocketChannelOutputBuffer.flush(SocketChannelOutputBuffer.java:183) at com.sun.enterprise.web.connector.grizzly.async.AsynchronousOutputBuffer.flush(AsynchronousOutputBuffer.java:104) at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.action(DefaultProcessorTask.java:1100) at org.apache.coyote.Response.action(Response.java:237) at org.apache.coyote.tomcat5.OutputBuffer.doFlush(OutputBuffer.java:381) ... 41 more |#] [#|2010-03-22T11:18:44.376+0000|WARNING|sun-appserver2.1|oracle.toplink.essentials.session.file:/mygf-211/domains/mydomain/applications/j2ee-apps/myear/myjar-myPu|_ThreadID=39;_ThreadName=httpSSLWorkerThread-8080-2;_RequestID=4ca7e3e5-5ab7-41ec-b3c9-d9260b1164c9;| Local Exception Stack: Exception [TOPLINK-4002] (Oracle TopLink Essentials - 2.1 (Build b31g-fcs (10/19/2009))): oracle.toplink.essentials.exceptions.DatabaseException Internal Exception: com.microsoft.sqlserver.jdbc.SQLServerException: Eine Zeile mit doppeltem Schlüssel kann in das 'dbo.MY_TABLE'-Objekt mit dem eindeutigen 'MY_INDEX'-Index nicht eingefügt werden.

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  • how to fetch app data(name, version, etc.) from android market?

    - by liuxingruo
    As we know, the apps in the apple app store has a unique itunes link, and we can fetch app data about the app from app store through the link. I am wondering how can i achieve this in the android market, just like the website http://www.androlib.com/ did? As long as I know, each app in the android market has a ID, which just like "com.gabrouze.magic", and the QR Code can be viewed in "http://chart.apis.google.com/chart?cht=qr&chs=135x135&chl=market://search?q=pname:com.gabrouze.magic". Thanks!

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  • need thoughts on my interview question - .net, c#

    - by uno
    One of the questions I was asked was that I have a database table with following columns pid - unique identifier orderid - varchar(20) documentid - int documentpath - varchar(250) currentLocation - varchar(250) newlocation - varchar(250) status - varchar(15) I have to write a c# app to move the files from currentlocation to newlocation and update status column as either 'SUCCESS' or 'FAILURE'. This was my answer Create a List of all the records using linq Create a command object which would be perform moving files using foreach, invoke a delegate to move the files - use endinvoke to capture any exception and update the db accordingly I was told that command pattern and delegate did not fit the bill here - i was aksed to think and implement a more favorable GoF pattern. Not sure what they were looking for - In this day and age, do candidates keep a lot of info on head as one always has google to find any answer and come up with solution.

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  • Sudoku solver evaluation function

    - by Rich
    Hi, So I'm trying to write a simple genetic algorithm for solving a sudoku (not the most efficient way, I know, but it's just to practice evolutionary algorithms). I'm having some problems coming up with an efficient evaluation function to test if the puzzle is solved or not and how many errors there are. My first instinct would be to check if each row and column of the matrix (doing it in octave, which is similar to matlab) have unique elements by ordering them, checking for duplicates and then putting them back the way they were, which seems long winded. Any thoughts? Sorry if this has been asked before...

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  • How to reserve a set of primary key identifiers for preloading bootstrap data

    - by Joshua
    We would like to reserve a set of primary key identifiers for all tables (e.g. 1-1000) so that we can bootstrap the system with pre-loaded system data. All our JPA entity classes have the following definition for the primary key. @Id @GeneratedValue(strategy = IDENTITY) @Column(name = "id", unique = true, nullable = false, insertable = false, updatable = false) private Integer id; is there a way to tell the database that increments should start happening from 1000 (i.e. customer specific data will start from 1000 onwards). We support (h2, mysql, postgres) in our environment and I would prefer a solution which can be driven via JPA and reverse engineering DDL tools from Hibernate. Let me know if this is the correct approach

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  • SQLite - a smart way to remove and add new objects

    - by Ilya
    Hi, I have a table in my database and I want for each row in my table to have an unique id and to have the rows named sequently. For example: I have 10 rows, each has an id - starting from 0, ending at 9. When I remove a row from a table, lets say - row number 5, there occurs a "hole". And afterwards I add more data, but the "hole" is still there. It is important for me to know exact number of rows and to have at every row data in order to access my table arbitrarily. There is a way in sqlite to do it? Or do I have to manually manage removing and adding of data? Thank you in advance, Ilya.

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  • Help me with a solution for what could be solutioned by virtual static fields... in FPC

    - by Gregory Smith
    Hi I'm doing an event manager in Freepascal Each event is an object type TEvent (=object), each kind of event must derive from this class. Events are differentiated by an integer identificator, assigned dynamically. The problem is that i want to retrieve the event id of an instance, and i can't do it well. All instances of a class(object) have a unique id = so it should be static field. All classes have a diferent id = so it should be virtual. Event ids are assignated in run time, and can change = so it can't be a simple method In sum, I can't put all this together. I'm looking for an elegant solution, i don't want to write a hardcoded table, actualizing it in every constructor... etc, i'd prefer something taking advantage of the polymorphism Can anyone help me with another technical or design solution? I remark I don't want to use class instead of object construct.(property doesn't work on objects? :(

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  • relational database: how to design this table

    - by donpal
    I'm a database newbie designing a database. I'll use SO to ask my question because it's easier to ask it on something that you can see already, but it's not the same, it will just help me understand the right approach. As you can see, there are many questions here and each can have many answers. How should I store the answers in a table? Should I store all the answers in the SAME table with a unique id (make it the key) and just a new field for the question id? What if there are 100,000 answers like there is here? Do I still store them in 1 table? What keys should I use to minimize search time when I want to search for the answers of a specific question? The database is both read and write if that makes any difference in this case.

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  • django model Form. Include fields from related models

    - by Tom
    Hi. I have a model, called Student, which has some fields, and a OneToOne relationship with user (django.contrib.auth.User). class Student(models.Model): phone = models.CharField(max_length = 25 ) birthdate = models.DateField(null=True) gender = models.CharField(max_length=1,choices = GENDER_CHOICES) city = models.CharField(max_length = 50) personalInfo = models.TextField() user = models.OneToOneField(User,unique=True) Then, I have a ModelForm for that model class StudentForm (forms.ModelForm): class Meta: model = Student Using the fields attribute in class Meta, i've managed to show only some fields in a template. However, can I indicate which user fields to show? Something as: fields =('personalInfo','user.username') is currently not showing anything. Works with only StudentFields though/ Thanks in advance.

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  • Consolidate data from many different databases into one with minimum latency

    - by NTDLS
    I have 12 databases totaling roughly 1.0TB, each on a different physical server running SQL 2005 Enterprise - all with the same exact schema. I need to offload this data into a separate single database so that we can use for other purposes (reporting, web services, ect) with a maximum of 1 hour latency. It should also be noted that these servers are all in the same rack, connected by gigabit connections and that the inserts to the databases are minimal (Avg. 2500 records/hour). The current method is very flakey: The data is currently being replicated (SQL Server Transactional Replication) from each of the 12 servers to a database on another server (yes, 12 different employee tables from 12 different servers into a single employee table on a different server). Every table has a primary key and the rows are unique across all tables (there is a FacilityID in each table). What are my options, these has to be a simple way to do this.

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  • Getting filtered results with subquery

    - by josepv
    I have a table with something like the following: ID Name Color 1 Bob Blue 2 John Yellow 1 Bob Green 3 Sara Red 3 Sara Green What I would like to do is return a filtered list of results whereby the following data is returned: ID Name Color 1 Bob Blue 2 John Yellow 3 Sara Red i.e. I would like to return 1 row per user. (I do not mind which row is returned for the particular user - I just need that the [ID] is unique.) I have something already that works but is really slow where I create a temp table adding all the ID's and then using a "OUTER APPLY" selecting the top 1 from the same table, i.e. CREATE TABLE #tb ( [ID] [int] ) INSERT INTO #tb select distinct [ID] from MyTable select T1.[ID], T2.[Name], T2.Color from #tb T1 OUTER APPLY ( SELECT TOP 1 * FROM MyTable T2 WHERE T2.[ID] = T1.[ID] ) AS V2 DROP TABLE #tb Can somebody suggest how I may improve it? Thanks

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  • Keep only a subtree of the DOM tree

    - by Randomblue
    On BBC articles, such as this one, there is a DOM element with class story-body, deep in the DOM chain. I want to hide all DOM element "outside" of this (unique) DOM element. The problem is that I can't just do $('*').hide(); $('.story-body'); because I need to make sure to keep the parents, grand-parents, etc. of story-body. I also can't do $('*').hide(); var current = $('.story-body').show(); while(current = current.parent()) { current.show(); } because that would simply show everything. Any suggestions?

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  • How to change a field value of a document (LotusScript)?

    - by Vassilen Dontchev
    Hello. In a new LotusNotes form I have a computed-value field ("NewOrdProdUID") which is set correctly with the unique ID of another existing document. I want to change the value of the field "NewProdAvail" in the existing document by means of LotusScript. I tried with this: Sub Querysave(Source As Notesuidocument, Continue As Variant) Dim session As NotesSession Dim db As NotesDatabase Dim ws As New NotesUIWorkspace Dim uidoc As notesUIDocument Dim odoc As notesDocument Set session = New NotesSession Set db = session.CurrentDatabase Set uidoc = ws.CurrentDocument Set odoc = db.GetDocumentByUNID(uidoc.FieldGetText("NewOrdProdUID")) Call odoc.FieldSetText("NewProdAvail", "0") Call odoc.Save(True, True) End Sub However the value of the field "NewProdAval" stays the same (3 in my case, not 0). Please, help me!

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  • Avoiding thumbnail name collisions with sorl-thumbnail

    - by Owen Nelson
    Understanding that I should probably just dig into the source to come up with a solution, I'm wondering if anyone has come up with a tactic for dealing with this. In my project, I have a lot of images being generated outside of the application. I'm isolating them on the filesystem based on a model's pk. For example, a model instance with a pk of 121 might have the following images: .../thumbs/1/2/1/img.1.jpg .../thumbs/1/2/1/img.2.jpg ... .../thumbs/1/2/1/img.27.jpg Since the image filenames themselves are not guaranteed to be unique, I'm looking for a way to inform sorl (at runtime) that I'd like to prefix thumbs for this model with the instance pk value. Is this even possible without patching sorl?

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  • Prevent bot from crawling certain areas of site.

    - by Skoder
    Hey, I don't know much about SEO and how web spiders work, so forgive my ignorance here. I'm creating a site (using ASP.NET-MVC) which has areas that displays information retrieved from the database. The data is unique to the user, so there's no real server-side output caching going on. However, since the data can contain things the user may not wish to have displayed from search engine results, I'd like to prevent any spiders from accessing the search results page. Are there any special actions I should take to ensure that the search result directory isn't crawled? Also, would a spider even crawl a page that's dynamically generated and would any actions preventing certain directories being search mess up my search engine rankings? edit: I should add, I'm reading up on robots.txt protocol, but it relies on co-operation from the web crawler. However, I'd also like to prevent any data-mining users who will ignore the robots.txt file. I appreciate any help!

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  • Python SQLite: database is locked

    - by user322683
    I'm trying this code: import sqlite connection = sqlite.connect('cache.db') cur = connection.cursor() cur.execute('''create table item (id integer primary key, itemno text unique, scancode text, descr text, price real)''') connection.commit() cur.close() I'm catching this exception: Traceback (most recent call last): File "cache_storage.py", line 7, in <module> scancode text, descr text, price real)''') File "/usr/lib/python2.6/dist-packages/sqlite/main.py", line 237, in execute self.con._begin() File "/usr/lib/python2.6/dist-packages/sqlite/main.py", line 503, in _begin self.db.execute("BEGIN") _sqlite.OperationalError: database is locked Permissions for cache.db are ok. Any ideas?

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  • Suggest Cassandra data model for an existing schema

    - by Andriy Bohdan
    Hello guys! I hope there's someone who can help me suggest a suitable data model to be implemented using nosql database Apache Cassandra. More of than I need it to work under high loads and large amounts of data. Simplified I have 3 types of objects: Product Tag ProductTag Product: key - string key name - string .... - some other fields Tag: key - string key name - unique tag words ProductTag: product_key - foreign key referring to product tag_key - foreign key referring to tag rating - this is rating of tag for this product Each product may have 0 or many tags. Tag may be assigned to 1 or many products. Means relation between products and tags is many-to-many in terms of relational databases. Value of "rating" is updated "very" often. I need to be run the following queries Select objects by keys Select tags for product ordered by rating Select products by tag order by rating Update rating by product_key and tag_key The most important is to make these queries really fast on large amounts of data, considering that rating is constantly updated.

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  • Django, ModelForms, User and UserProfile - not hashing password

    - by IvanBernat
    I'm trying to setup a User - UserProfile relationship, display the form and save the data. When submitted, the data is saved, except the password field doesn't get hashed. Additionally, how can I remove the help_text from the username and password (inherited from the User model)? Full code is below, excuse me if it's too long. Models.py USER_IS_CHOICES = ( ('u', 'Choice A'), ('p', 'Choice B'), ('n', 'Ninja'), ) class UserProfile(models.Model): user = models.ForeignKey(User, unique=True) user_is = models.CharField(max_length=1, choices=USER_IS_CHOICES) Forms.py class UserForm(forms.ModelForm): class Meta: model = User fields = ["first_name", "last_name", "username", "email", "password"] def clean_username(self): username = self.cleaned_data['username'] if not re.search(r'^\w+$', username): raise forms.ValidationError('Username can contain only alphanumeric characters') try: User.objects.get(username=username) except ObjectDoesNotExist: return username raise forms.ValidationError('Username is already taken') class UserProfileForm(forms.ModelForm): class Meta: model = UserProfile fields = ['user_is'] Views.py if request.method == 'POST': uform = UserForm(request.POST) pform = UserProfileForm(request.POST) if uform.is_valid() and pform.is_valid(): user = uform.save() profile = pform.save(commit = False) profile.user = user profile.save() return HttpResponseRedirect('/') else: uform = UserForm() pform = UserProfileForm() variables = RequestContext(request, { 'uform':uform, 'pform':pform }) return render_to_response('registration/register.html', variables)

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  • Curve fitting: Find the smoothest function that satisfies a list of constraints.

    - by dreeves
    Consider the set of non-decreasing surjective (onto) functions from (-inf,inf) to [0,1]. (Typical CDFs satisfy this property.) In other words, for any real number x, 0 <= f(x) <= 1. The logistic function is perhaps the most well-known example. We are now given some constraints in the form of a list of x-values and for each x-value, a pair of y-values that the function must lie between. We can represent that as a list of {x,ymin,ymax} triples such as constraints = {{0, 0, 0}, {1, 0.00311936, 0.00416369}, {2, 0.0847077, 0.109064}, {3, 0.272142, 0.354692}, {4, 0.53198, 0.646113}, {5, 0.623413, 0.743102}, {6, 0.744714, 0.905966}} Graphically that looks like this: We now seek a curve that respects those constraints. For example: Let's first try a simple interpolation through the midpoints of the constraints: mids = ({#1, Mean[{#2,#3}]}&) @@@ constraints f = Interpolation[mids, InterpolationOrder->0] Plotted, f looks like this: That function is not surjective. Also, we'd like it to be smoother. We can increase the interpolation order but now it violates the constraint that its range is [0,1]: The goal, then, is to find the smoothest function that satisfies the constraints: Non-decreasing. Tends to 0 as x approaches negative infinity and tends to 1 as x approaches infinity. Passes through a given list of y-error-bars. The first example I plotted above seems to be a good candidate but I did that with Mathematica's FindFit function assuming a lognormal CDF. That works well in this specific example but in general there need not be a lognormal CDF that satisfies the constraints.

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  • Database Design Primay Key, ID vs String

    - by LnDCobra
    Hi, I am currently planning to develop a music streaming application. And i am wondering what would be better as a primary key in my tables on the server. An ID int or a Unique String. Methods 1: Songs Table: SongID(int), Title(string), Artist*(string), Length(int), Album*(string) Genre Table Genre(string), Name(string) SongGenre: SongID*(int), Genre*(string) Method 2 Songs Table: SongID(int), Title(string), ArtistID*(int), Length(int), AlbumID*(int) Genre Table GenreID(int), Name(string) SongGenre: SongID*(int), GenreID*(int) Key: Bold = Primary Key, Field* = Foreign Key I'm currently designing using method 2 as I believe it will speed up lookup performance and use less space as an int takes a lot less space then a string. Is there any reason this isn't a good idea? Is there anything I should be aware of?

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  • Instantiate type variable in Haskell

    - by danportin
    EDIT: Solved. I was unware that enabling a language extension in the source file did not enable the language extension in GHCi. The solution was to :set FlexibleContexts in GHCi. I recently discovered that type declarations in classes and instances in Haskell are Horn clauses. So I encoded the arithmetic operations from The Art of Prolog, Chapter 3, into Haskell. For instance: fac(0,s(0)). fac(s(N),F) :- fac(N,X), mult(s(N),X,F). class Fac x y | x -> y instance Fac Z (S Z) instance (Fac n x, Mult (S n) x f) => Fac (S n) f pow(s(X),0,0) :- nat(X). pow(0,s(X),s(0)) :- nat(X). pow(s(N),X,Y) :- pow(N,X,Z), mult(Z,X,Y). class Pow x y z | x y -> z instance (N n) => Pow (S n) Z Z instance (N n) => Pow Z (S n) (S Z) instance (Pow n x z, Mult z x y) => Pow (S n) x y In Prolog, values are insantiated for (logic) variable in a proof. However, I don't understand how to instantiate type variables in Haskell. That is, I don't understand what the Haskell equivalent of a Prolog query ?-f(X1,X2,...,Xn) is. I assume that :t undefined :: (f x1 x2 ... xn) => xi would cause Haskell to instantiate xi, but this gives a Non type-variable argument in the constraint error, even with FlexibleContexts enabled.

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