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• Scraping html WITHOUT uniquie identifiers using python

  - by Nicholas Law

  I would like to design an algorithm using python that scrapes thousands of pages like this one and this one, gathers all the data and inserts it into a MySQL database. The script will be run on a weekly or bi-weekly basis to update the database of any new information added to each individual page. Ideally I would like a scraper that is easy to work with for table structured data but also data that does not have unique identifiers (ie. id and classes attributes). Which scraper add-on should I use? BeautifulSoup, Scrapy or Mechanize? Are there any particular tutorials/books I should be looking at for this desired result? In the long-run I will be implementing a mobile app that works with all this data through querying the database.

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• Unable to view users and groups

  - by Ewr Xcerq

  I am using Centos5 running on a VMWare but whenever I choose to open the User Manager menu from System-Administration, an error message always displays The user database cannot be read. This problem is most likely caused by a mismatch between etc/passwd and /etc/shadow or /etc/group and /etc/gshadow/. The program will now exit. I am a Linux novice and have no idea how to fix this tiny issue. ANy help is thankful. Thank you.

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• GUID not being generated automatically when db.submitchanges()

  - by BlindingDawn

  I have a couple of tables I ported over to a new database. Everything is exactly the same from the legacy one to the new one. The back-end code that submits the user generated data to the database is also the same. When I submit changes to the database, all of the submitted information populates the correct columns but the column that stores the GUID populates with all 0's. When I enter in the columns manually using SQL Server Management Studio, the GUID gets populated as it does in the legacy version. Am I missing something?

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• How do detect that transaction has already been started?

  - by xelurg

  I am using Zend_Db to insert some data inside a transaction. My function starts a transaction and then calls another method that also attempts to start a transaction and of course fails(I am using MySQL5). So, the question is - how do I detect that transaction has already been started? Here is a sample bit of code: try { Zend_Registry::get('database')->beginTransaction(); $totals = self::calculateTotals($Cart); $PaymentInstrument = new PaymentInstrument; $PaymentInstrument->create(); $PaymentInstrument->validate(); $PaymentInstrument->save(); Zend_Registry::get('database')->commit(); return true; } catch(Zend_Exception $e) { Bootstrap::$Log->err($e->getMessage()); Zend_Registry::get('database')->rollBack(); return false; } Inside PaymentInstrument::create there is another beginTransaction statement that produces the exception that says that transaction has already been started.

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• Better understanding of my SQL transactions

  - by Slew Poke

  I just realized that my application was needlessly making 50+ database calls per user request due to some hidden coding -- hidden in the sense that between LINQ, persistence frameworks and events it just so turned out that a huge number of calls were being made without me being aware. Is there a recommended way to analyze individual transactions going to my SQL 2008 database, preferably with some integration to my Visual Studio 2010 environment? I want to be able to 'spy' on individual transactions being made, but only for certain pieces of my code, and without making serious changes to either the code or database.

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• display format for gridview

  - by peter

  I have a grid named 'GridView1' contains two columns 'Date' and 'Session Deatils' i am displaying like this way only <asp:GridView ID="GridView1" OnRowCommand="ScheduleGridView_RowCommand" runat="server" AutoGenerateColumns="False" Height="60px" Style="text-align: center" Width="869px" EnableViewState="False"> <Columns> <asp:BoundField HeaderText="Date" DataField="Date"><HeaderStyle Width="80px" /></asp:BoundField> <asp:BoundField DataField="" HeaderText="Session Detais" /> </Columns> But here i need to display 3 column sections downside Session details without any column borders for each dates,,how can i achive like this wasy Date SessionDetails 06-04-2010 Time-(value from database) Topic-(value from database) Head-(value from database) ------- ------------------ ------------------- ----------------------

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• What's the simplest way to let the user download a file in ASP.NET MVC ?

  - by drasto

  In an ASP.NET MVC I have a database table. I want to have a button on some view page, if some user clicks that button I my application will generate XML file containing all rows in the database. Then the file containing XML should be sent to the client so that the user will see a download pop-up window. Similarly I want to allow user to upload an XML file whose content will be added to the database. What's the simplest way to let the user upload and download file ? Thanks for all the answers

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• Getting Top (starting no , Ending no) rows from sqlserver

  - by Krishna Thota

  I'm using Grid view in my asp.net page and I'm fetching data from SQL Server and placing in my grid view. Now my problem is, I'm using paging and placing 50 rows per page in Grid view. I would like to fetch top 50 rows from database in the start up and bind to the Grid View and when i click on next page, then again go to the database and fetch Second Top 50 rows and bind to GV. and this process hasto continue until last row is fetched from Database. Can you tell me How to write Query in achieving this??

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• Design guidelines for cache mechanism

  - by Delashmate

  Hi All, I got assignment to write design for cache mechanism (this is work assignment, not homework), This is my first time writing a design document, Our program display images for doctors, and we want to reduce the parsing time of the images So we want to save the parsed data in advance (in files or inside database) Currently I have several design key ideas: Handle locks - each shared data structure should be handled, also files Test - add test to verify the data from the cache is equal to the data from the files To decouple the connection to the database- not to call directly to the database Cleanup mechanisem- to delete old files if the cahce directory exceed configurable threshold Support config file Support performance tool in the feature I will also add class diagram, data flow charts, and workflow What do you think I should add to the key ideas? Do you know good link to atricales about design? Thanks in advance, Dan

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• Can I write to different jetty databases using JPA that is using the same "entity class"

  - by Per

  I am using Java persistance and there EntityManager class and have it assigned to storage a class object that shall be written to the database. My problem is that I want to write to different databases using the same storage class. My solution to that was to write a StorageManagerfactory that has a Map holding all EntityManagers. The solution looked good until I looked at the databases and realized that all information (undepending of the Map, which gets the correct value) was written to the same database (one of the initialised in the Map). So my question is: Can I write to different databases using JPA that is using the same storage class (the class holding the structure of my database)? Thanks

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• tracing one oracle listener at a time

  - by Bob

  I need to turn on sqlnet tracing on the server. We have several listeners for the same database home. However, since it is the same database home, we have 1 sqlnet file. How do I turn tracing on for just 1 listener in that oracle home trace_level_server=16 trace_timestamp_server=true trace_directory_server= Oracle 10.1.0.3 OS: Solaris 10

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• How do I ensure data consistency in this concurrent situation?

  - by MalcomTucker

  The problem is this: I have multiple competing threads (100+) that need to access one database table Each thread will pass a String name - where that name exists in the table, the database should return the id for the row, where the name doesn't already exist, the name should be inserted and the id returned. There can only ever be one instance of name in the database - ie. name must be unique How do I ensure that thread one doesn't insert name1 at the same time as thread two also tries to insert name1? In other words, how do I guarantee the uniqueness of name in a concurrent environment? This also needs to be as efficient as possible - this has the potential to be a serious bottleneck. I am using MySQL and Java. Thanks

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• SQL Server Compact Edition 3.5 performance

  - by Wili

  I am using SQL Server CE 3.5 SP1 in one of my client applications. When a user loads the program and starts using it, performance is fine. If the user lets the program sit idle for a while, it takes a considerable amount of time (10 or more seconds) for the program to respond. Every time the user asks for a new screen, a call is made to the SQL CE database to get the data for that screen. It seems like the hard drive may be going to sleep and then when the database is accessed, the hard drive has to wake back up. Is it possible to load the entire database into memory and work from that? Are there any other suggestions on how to increase performance?

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• Creating a session user login php

  - by user2419393

  I'm stuck on how to create a session for a user who logs in. I got the part of checking to make sure the log in information corresponds with the database information, but is stuck on how to take the email address and store into a session. Here is my php code below. <?php include '../View/header.php'; session_start(); require('../model/database.php'); $email = $_POST['username']; $password = $_POST['password']; $sql = "SELECT emailAddress FROM customers WHERE emailAddress ='$email' AND password = '$password'"; $result = mysql_query($sql, $db); if (!$result) { echo "DB Error, could not query the database\n"; echo 'MySQL Error: ' . mysql_error(); exit; } while ($row = mysql_fetch_assoc($result)) { echo $row['emailAddress']; } mysql_free_result($result); ?>

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• Can't manage Exchange 2007 Room via OWA

  - by PHLiGHT

  I created a couple of rooms in Exchange 2007 (http://www.msexchange.org/articles_tutorials/exchange-server-2007/management-administration/managing-resource-mailboxes-exchange-server-2007-part1.html)and I want to logon to OWA to manage resource settings but I can't logon to the mailboxes via OWA because of an invalid password error. I've reset it but still no luck. I've granted myself full permissions to the mailbox and try to access via my account but I just get a popup of my own account in the browser (ie9 and ie8). What's going on here?

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• Linq query with Array in where clause?

  - by Matt Dell

  I have searched for this, but still can't seem to get this to work for me. I have an array of Id's associated with a user (their Organization Id). These are placed in an int[] as follows: int[] OrgIds = (from oh in this.Database.OrganizationsHierarchies join o in this.Database.Organizations on oh.OrganizationsId equals o.Id where (oh.Hierarchy.Contains(@OrgId)) || (oh.OrganizationsId == Id) select o.Id).ToArray(); The code there isn't very important, but it shows that I am getting an integer array from a Linq query. From this, though, I want to run another Linq query that gets a list of Personnel, that code is as follows: List<Personnel> query = (from p in this.Database.Personnels where (search the array) select p).ToList(); I want to add in the where clause a way to select only the users with the OrganizationId's in the array. So, in SQL where I would do something like "where OrganizationId = '12' or OrganizationId = '13' or OrganizatonId = '17'." Can I do this fairly easily in Linq / .NET?

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• ORM Against a Service-Wrapped Data Source

  - by blaster

  We are tasked with migrating an existing set of entities (currently POCOs persisted with NHibernate against an MSSQL database) to now persist to some kind of web service (yet to be built, either RESTful or SOAP-based, and that we control). I like how NHibernate encapsulates the persistence concerns and lets us maintain a logic-rich, persistence-agnostic domain model. Is there any way to make NHibernate talk to a web service at the back end instead of a SQL database directly? In other words, can "service instead of SQL database" be treated as a persistence implementation detail and allow us to continue to use NHibernate? Am I asking the right question? :)

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• What is a good way of coding a file processing program, which accepts multisource data in Java

  - by jjepsuomi

  I'm making a data prosessing system, which currently is using csv-data as input and output form. In the future I might want to add support for example database-, xml-, etc. typed input and output forms. How should I desing my program so that it would be easy to add support for new type of data sources? Should simply make for example an abstract data class (which would contain the basic file prosessing methods) and then inherit this class for database, xml, etc. cases? Hope my question is clear =) In other words my question is: "How to desing a file prosessing system, which can be easily updated to accept input data from different sources (database, XML, Excel, etc.)".

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• Java import from other directory

  - by heldopslippers

  Hi People! I am building a Enterprise Service Bus (ESB) with Java. I won't get into details But I have to build multiple servers who make use of the same classes. I have the following directory structure: /server1 -Main.java /server2 -Main.java /com -Database.java I want to import from the Main.java class for example the Database.class. But of course the following statements won't work: import com.Database; I am working with the javac compiler in the command line (so not eclipse stuff or whatever. just TextMate and the command line). And I found a (pretty stupid) solution by creating a symbolic link in the servers to the com directory. But that is not really an ideal solution. Does anybody have a better one?? THANXS in advanced!! :D

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• Two DomainContext or data sources with WCF RIA - Silverlight page

  - by Mayur Kotlikar

  I am writting a Silverlight Business Application with WCF RIA link. I have 2 databases on same SQL server, Public and Private. The Public database contains a table which is mostly for public access level, like "user" table which has basic user information The Private database contains a table which has "private" information, user bank transactions etc I created 2 ADO.Net entity models, one each for Private and Public database and selected the tables. I also created 2 different domain context services On on Silverlight page, I need to get information from the tables that are across 2 databases, Private and Public as described above. How do I achieve this? I am thinking of some kind of a wrapper that internally gets data from domain services. Whats the best approach?

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• Free web gallery installation that can use existing directory hierarchy in filesystem?

  - by user1338062

  There are several different free software gallery projects (Gallery, Coppermine, etc), but as far as I know each of those creates a copy of imported images in their internal storage, be it directory structure or database). Is there any gallery software that would allow keeping existing directory hierarchy of media files (images, videos), as-is, and just store the meta-data of them in a database? I guess at least various NAS solutions ship with software like this.

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• Why Does TFS Allow Orphaned Content and How Do I Get Rid of It?

  - by Chad

  My TfsVersionControl database has grown to 40+ GB in size. We recently did a TFS Destroy on a folder tree that should have cleared up at least 10 GB but instead it seemed to have no effect. When I look at the tables in TfsVersionControl, I am first shocked to see that there are no foreign keys at all in the database. Running a few queries, I see that there is some orphaning going on: tbl_Content has 13.9 GB of records that don't have a related tbl_File record tbl_File and tbl_Content have 2.4 GB that don't have a related tbl_Namespace record The cleanup job seems to be running nightly (prc_DeleteUnusedContent) and running it against the database manually doesn't remove any orphans. I see in the log for the cleanup job that it failed on 3/16, which is the morning after I destroyed the large amount of data. The error was due to a full transaction log. Could that error be the reason I'm left with all this orphaned data that can't be deleted? How can I permanently destroy this unneeded content?

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• sqlite3.OperationalError

  - by fixxxer

  Hi, The "python manage.py syncdb" command is giving me the following error: sqlite3.OperationalError: unable to open database file I'm following the step by step instructions in Practical Django Projects, so I think this has to do something with the Windows Operating system acting quirky! Things I've checkde: 1.The path is updated in settings.py is absolutely correcto! 2. Path is : C:\Documents and Settings\fixavier\Desktop\Django\Database\cms\cms.txt So the entire folder - Database, has sharing and security permissions. I'm pretty much at the bottom of the ocean for not being able to follow and successfully execute simple instructions, so could you please help me out here!

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• Cannot enable wireless Ubuntu 10.04

  - by woaddoa

  I have recently installed Ubuntu 10.04, however I am having trouble getting wireless to work. Ubuntu says that wireless is disabled, and I am unable to enable it. I have tried Administration Hardware Drivers however the only drivers listed are Nivida graphics ones. I am unsure what to do as I do not think the process is the same as searching for drivers for a windows machine. Any advice appreciated.

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• Reading Characher from Image

  - by Chinjoo

  I am working on an application which requires matching of numbers from a scanned image file to database entry and update the database with the match result. Say I have image- employee1.jpg. This image will have two two handwritten entries - Employee number and the amount to be paid to the employee. I have to read the employee number from the image and query the database for the that number, update the employee with the amount to be paid as got from the image. Both the employee number and amount to be paid are written inside two boxes at a specified place on the image. Is there any way to automate this. Basically I want a solution in .net using c#. I know this can be done using artificial neural networks. Any ideas would be much appreciated.

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