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• Is there an automatic way to generate a rollback script when inserting data with LINQ2SQL?

  - by Jedidja

  Let's assume we have a bunch of LINQ2SQL InsertOnSubmit statements against a given DataContext. If the SubmitChanges call is successful, is there any way to automatically generate a list of SQL commands (or even LINQ2SQL statements) that would automatically undo everything that was submitted? It's like executing a rollback even though everything worked as expected. Note: The destination database will either be Oracle or SQL Server, so if there is specific functionality for both databases that will achieve this, I'm happy to use that as well.

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• Linq-to-SQL: how many datacontexts ?

  - by sh00

  I have a SQL Server 2008 database with 300 tables. The application I have to design is an Windows Forms app, .NET 3.5, C#. Which is the best way to work with Linq-to-SQL ? I intend to make a datacontext for each business entity. Is there any problem ? I need to know if this way of working with Linq-to-SQL has any disadvantage or can create performance issues ? Thanks.

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• How can one fetch partial objects in NHibernate?

  - by mark

  Dear ladies and sirs. I have an object O with 2 fields - A and B. How can I fetch O from the database so that only the field A is fetched? Of course, my real application has objects with many more fields, but two fields are enough to understand the principal. I am using NHibernate 2.1. Thanks.

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• Change asp message box header / title

  - by Jb Meris

  how can i change the title of my message box here is my code behind: string myStringVariable1 = string.Empty; myStringVariable1 = "Policy Number:" + " " + txtPolNo.Text.ToString() + " " + "with Issuance office:" + " " + dropIssOff.Text.ToString() + " " + "was not found on the database. Please make sure that your inputs are correct."; ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('" + myStringVariable1 + "');", true);

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• How do I use Microsoft Sync Framework to sync between SQL Server 2008 and a .NET Webservice?

  - by DanG

  Does anyone have an example of how to use MS Sync framework with .NET webservices? I have SQL Server 2008, which is exposing data to BlackBerry devices through webservices using regular web methods. Can I use the Sync Framework to expose data through Web Services and to save it back to the database?

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• Linq to SQL: How to delete using only the primary key?

  - by Jeremy

  How do I delete a record using Linq to SQL using only the primary key, without having to retrieve the exsting record from the database?

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• What is the preferred method of refreshing a combo box when the data changes?

  - by Craig Johnston

  What is the preferred method of refreshing a combo box when the data changes? If a form is open and the combo box data is already loaded, how do you refresh the contents of the combo box without the form having to be closed and reloaded? Do you have to do something on the Click event on the combo box? This would seem to be a potential slow down for the app if there is a hit to the database every time someone clicks on a combo box.

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• Will a SHA256 hash always have 64 characters?

  - by Sergio Tapia

  I'm setting up my database to receive hashed passwords and not accept plain text. Would I go something like this? create table User( username varchar(20) not null, password varchar(64) not null, );

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• how to login in google account with app engine webproxy

  - by user313446

  hi,a webproxy on app engine oncyberspace.appspot.com , save cookie in the database, when i try to login in the google with my account, it redirect to google.com . how to solve these problem ? and another problem , when i this the above web to login in twitter,it works !but i can not use it to update my tweet. i don't know why, may be i can't pass oauth . how to solve this ?

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• Where does the creation of permissions live in Django?

  - by lazerscience

  I need to do some debugging, because the permissions for one of my models are created wrongly. So I tried to find the piece of code where Django creates the permissions upon syncdb and writes them in the database, but I haven't been successful at all; maybe I just overlooked the right lines of code, but if somebody can point me out the right module / line of code where this happens I'd be very happy!

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• SQL Compact - Hang on invalid file

  - by eWolf

  I use Linq to Sql Compact with code generated by sqlmetal. When I open an invalid database, like eg an mp3, I can create the DataContext without getting an Exception. But when I query any data or call DatabaseExists, the application hangs. Why is no exception thrown? Is this a known problem?

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• Long time to load first sql connection in C# .NET

  - by Shrage Smilowitz

  For some reason it takes 7 seconds to open a connection to a sql server database for the firt time, subsequent connections takes a second. any idea what could be the reason? I'm using C# and asp.net

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• insert number of days of year, months, days of month

  - by ml

  How can I insert in a database the number of days of the year and at the same time insert in the same record the month, day of the month, and the day of the week? This is my table: tabela/coluna.Dias_ano(registo 1...365) Year:=StrToInt(ano.Text); diasano.Text:= IntToStr( DaysInAYear(Year) ); diasAno| Mes |diames |dia semana | 1 | janeiro | 1 |Segunda | 2 | janeiro | 2 | Terça | ... 365 | Dezembro | 31 | Segunda

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• Object Pooling managment algorithm.

  - by Talha Bin Shakir

  Hi, Anyone can help me to write an algorithm for object pooling. I am very new in J2EE and i need object pooling for database connection. So please help out. Thanks

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• Berkeley DB replication: upper limit on number of replicants?

  - by Mark Harrison

  I'm considering using Berkeley DB to cache some data on an application cluster. What's a reasonable upper limit on the number of nodes I can plan on Berkeley DB handling? Writing to the database will be from a single node.

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• Are Multi-column Primary Keys in MySQL a optimisation problem?

  - by David

  Been looking into using multi-column primary keys and as performance is extremely important with the size of traffic and database I need to know if there is anything to consider before I start throwing out the unique ID method on many of my tables and start using mulit column primary keys. So, what are the performance/optimisation pros/cons to using multi column primary keys versus a basic single column, auto-inc primary key?

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• Will performance of a SQL server degrade if the DB can't fit in the memory?

  - by Carl Hörberg

  Will the performance of a SQL server drastically degrade if the database is bigger than the RAM? Or does only the index have to fit in the memory? I know this is complex, but as a rule of thumb?

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• Allow repeater to be arranged using drag-drop

  - by o-logn

  Hey all, I have a repeater that's bound to a SQL Data Source (using ASP.NET). Are there any JQuery plugins/efficient way of converting my repeater into something that can be sorted via drag and drop? i.e. users can rearrange the order of the data, which updates the database? Thanks

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• Recovering From An SQL Injection

  - by Bryan

  Let's not go so far as to say that I'm paranoid, but I've been spending hour after hour learning how to prevent SQL injections (and XSS for what it's worth). What I'm wondering is that a SQL injection doesn't seem like it would do permanent harm to my database if I've made daily backups. Doesn't importing yesterday's copy of my tables just restore them and then I can be on my merry way?

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• AutoGen DB models for ASP .NET

  - by Tereno

  Hi there, I am wondering if there's anything out there for ASP .NET that is similar to Django or Ruby on Rails. Specifically, I'm looking for something that allows me to auto-generate the database models by specifying my classes in the controller and what not. Would I be able to achieve those functionality with IronPython or IronRuby? Thanks!

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• How to Use Accordian Control in GridView

  - by Khilen

  i have Category & subCategory Detail i want that in Header of Accordion i can get Category Detail and when click on that related subcategory is displayed but i am retrieving data from database and even the subcateogry will contain a gridview so please give me example how to make such

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• Creating a MySQL view with an auto-incrementing id column

  - by hmemcpy

  I have a MySQL database from which a view is created. Is is possible to add an auto-incrementing id for each row in the view? I tried CREATE ALGORITHM=UNDEFINED DEFINER=`database_name`@`%` SQL SECURITY DEFINER VIEW `MyView` AS set @i = 0; select @i:=@i+1 as `id` ... but that doesn't work in a View. Sorry, my SQL is weak, any help is appreciated.

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• Cross browser window close event

  - by slik

  Is there a solution for cross browser event. I need to check if user closes their window and to throw an ajax request to my database to sign them out. I've looked everyone but most cases its not working in all browsers. Anyone have a solution? Or Alternative on how to do this perhaps a conditional statement depending on the browser? Thanks!

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• How to create Chat application using Servlets & JSP

  - by Crazy boy

  I want to create chat application using Servlets & JSP. May I know how can I create chat application as I have never created before? How much knowledge I need to have to create chat application? Is there any need of networking API to create chat application? What's the design pattern I need to follow to create that application? Is there any need of database?

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• converting html entity to utf-8 character

  - by Anthony Umpad

  Hello, I am having this problems in grails where I am writing a string from the database into an xml file using StreamingMarkUpBuilder. The xml file displays the string as htmlentities &#x30b3 &#x30d4 &#x30fc, how can I convert them to be printed as コピー? Thanks!

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