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• Rails3: how to use relational algebra to replace SQL-constructions like NOT and OUTER JOIN

  - by petRUShka

  There are two models Post and Comment. I should get all posts, which have no comments with specific tag. How can I do this using new Rails 3 features such relational algebra (arel). SQL-solution should be something like this: SELECT `posts`.* FROM `posts` LEFT OUTER JOIN `comments` ON `posts`.`id` = `comments`.`post_id` WHERE NOT (`comments`.`tag` = 'my_tag')

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• FirstOrDefault In F#

  - by build_your_web

  How to write FirstOrDefault Linq Query in F#? Can I use linq to sql in F# in totally?

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• How to create a column that can never be updated?

  - by Randy Minder

  In SQL Server 2008, is it possible to create a column that can have a value inserted into it, but can never be updated? In other words, the column can have an initial value inserted into it, but once it contains a non-null value, it can never be changed. If possible, I would prefer to do it without using a trigger. Thanks - Randy

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• What does it mean: SQL state: 42703 Context: Error occurred on dblink connection named "unnamed": co

  - by Z77

  I tried to create exactly the same but new table from old table in another database using dblink. This procedure used to worked last two times, but this time I got message: "SQL state: 42703 Context: Error occurred on dblink connection named "unnamed": could not execute query." Anyone knows where is the problem or how to solve it? Please!

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• transactions in MS Access

  - by arcticpenguin

  Let's say I have the following code in a form that is triggered on some click event. DoCmd.SetWarnings False DoCmd.OpenQuery "AddSomeStuff" DoCmd.OpenQuery "UpdateSomeOtherStuff" DoCmd.OpenQuery "DeleteABunchOfCrap" DoCmd.SetWarnings True Can I assume that the three update queries I executed (in SQL Server) are not transactional in that they are run is separate transactions?

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• Python: Cannot concatenate str and NoneType objects

  - by Chase Higgins

  sql = """ INSERT INTO [SCHOOLINFO] VALUES( '""" + self.accountNo + """', '""" + self.altName + """', '""" + self.address1 + """', '""" + self.address2 + """', '""" + self.city + """', '""" + self.state + """', '""" + self.zipCode + """', '""" + self.phone1 + """', '""" + self.phone2 + """', '""" + self.fax + """', '""" + self.contactName + """', '""" + self.contactEmail + """', '""" + self.prize_id + """', '""" + self.shipping + """', '""" + self.chairTempPass + """', '""" + self.studentCount + """' ) """; I have the following code and Python keeps throwing the error that it cannon concatenate strings and nonetype objects. The thing is I have verified every variable here is in fact a string and is not null. I have been stuck on this for quite some time today, and any help would be greatly appreciated.

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• Generate data classes failed ?

  - by user301089

  Hi everyone, I use MonoDevelop 2.2.2 with Mono 2.6.3 on OpenSuse so the linq to sql feature is implemented. But I have the problem I can create a new connexion to a postgresql database it's ok but when I click in Tool - Generate Data classes and select the connexion I've created before I obtain nothing, no tables appear. What's the problem ?

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• Where can I find an introduction to using PDO?

  - by aslum

  I know my SQL safety isn't up to par. I've read on this site that PHP PDO would be a good first step, and while I did take a look at the PDO Manual it's a bit daunting. Is there somewhere I can find a tutorial on the basics of using PDO rather then straight MySQL calls?

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• How do I protect against cross-site scripting?

  - by shahinkian

  I am using php, mysql with smarty and I places where users can put comments and etc. I've already escaped characters before inserting into database for SQL Injection. What else do I need to do?

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• How to force username and password entry in C# / VS web app?

  - by salvationishere

  I am trying to force user to enter username and password when they run my C#/SQL web application. This was developed in VS 2008 on a 32-bit XP. The current connection string I'm using in my web.config file is: But it still doesn't prompt for a username and password. What am I missing?

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• Strip OLE header information (MS Access / SQL Server)

  - by crimson13

  I have a C++ application that needs to support binary database content (images, etc). When using MS Access or MS SQL Server this data is wrapped inside an OLE object. How do I strip this OLE header information? Note that I can't just look for the beginning of a specific tag as the content can be png, jpg and a whole heap of other formats. Should I use something like COleDataObject?

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• SQL Bulkcopy using DATA Access block

  - by Sathish

  I am using the below piece of code for SQL Bulk copy using (SqlConnection con = new SqlConnection(strConString)) { con.Open(); SqlBulkCopy sqlBC = new SqlBulkCopy(con); sqlBC.DestinationTableName = "SomeTable"; sqlBC.WriteToServer(dtOppConSummary); } Can anyone provide me the equvalent code using Data access block Enterprise library

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• Creating an index on a view with OpenQuery

  - by Sung Meister

  SQL Server doesn't allow creating an view with schema binding where the view query uses OpenQuery as shown below. Is there a way or a walk-around to create an index on such a view?

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• ASP.NET Membership vs SQL Authentication

  - by Gern Blandston

  For ASP.NET MVC extranet applications, what are the pros and cons of using SQL Authentication instead of the ASP.NET Membership API to handle security?

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• Visual Studio Setup Project Installer Prerequisite for SQL Server CE

  - by blu

  I have a Setup Project in my solution in Visual Studio 2008 SP1. The application installs fine but it is not loading my prerequisite of SQL Server CE. I have the following configurations set: Do I need to do anything else, like with a Custom Action or anything like that? Thanks.

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• set datasource crystal report 10 at runtime using vb 6.0 and SQL server 2005

  - by rah.deex

  Please help... I am so confused, how to set Crystal Report 10 data source at runtime using VB 6.0. I am using SQL SERVER 2005 for database and I create the reports using stored procedure.. do You have any idea to solve my problem ? thanks before..

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• Invoking a PL/SQL function from EclipseLink

  - by Mark Robinson

  I'm trying to execute a PL/SQL function in EclipseLink which uses Oracle Specific types(eg. Boolean). I've tried using PLSQLStoredProcedureCall which complains that I'm not executing a procedure and I have tried using StoredFunctionCall but that returns PLS-00382: expression is of wrong type Has anyone developed a solution to invoke functions in EclipseLink with Oracle Types? I have heard that it would be possible to extend StoredFunctionCall but I'd rather leverage existing functionality as much as possible.

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• SQL to join to the best matching row

  - by williamjones

  I have a wiki system where there is a central table, Article, that has many Revisions in their own table. The Revisions each contain a created_at time and date column. I want to update the Articles to contain a denormalized field sort_name from the most recent Revision's name field. What SQL command can I issue to fill in each Article's sort_name field with its most recent Revision's name field? For what it's worth, I'm on PostgreSQL.

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• Using the using statement with WinForms... Good Practice?

  - by Nate Heinrich

  I understand the concept and reasons behind using the using statement, and I use it with things like file resources and remote connections, I was wondering if it is good practice to use the using statement with WinForm forms and dialogs? using (MyDialog dlg = new MyDialog()) { if (dlg.ShowDialog() == EDialogResult.OK) { // Do Something } } Thanks!

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• Data Conversion

  - by cre-johnny07

  How do I convert 0.50 to 50 or 0.1429 to 14.29 in sql query? My data type is real.

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• The entity framework and database agnostic programming, possibilities?

  - by Theo

  We want to use the Entity Framework (.NET 4.0) to build applications that can deal with Sql Server, MySQL and Oracle. And maybe Sqlite too. It should be easy to switch the db vendor by some setting in a config file. Is this possible? I prefer real life examples! What kind of providers did you use?

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• Visual Representation Of Database Schema

  - by Richard Knop

  is there some standard about how to graphically represent database schemas? Is UML a defacto standard for this? Also, is there some free tool that can help me convert an sql file (basically bunch of CREATE TABLE queries) into some nice graph (UML or not UML)?

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• SQL GUI Programs

  - by jake

  Are there any programs with a gui which let you create a SQL database, create tables, define the primary and foreign keys and insert data? I am tired of having to use the mysql command line client, very tedious.

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• How to Configure TreeView to display data from SQL Server

  - by Ani

  I have a Browser and I want to display history & favorites of user on webbrowser on button_Click event. Can I accomplish this by using treeview in my form? if not what other way i can use. Data about History and Favorites is stored in SQL server database. Thanks, Ani

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• Check if a string contains a substring in SQL Server 2005 Stored Procedure

  - by NLV

  Hello I've a string @mainString = 'CATCH ME IF YOU CAN'. I want to check whether the word 'ME' inside @mainString. So how to check if a string has a substring in sql? Thank you Regards NLV

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