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• Using DefaultIfEmpty in Linq - problem substituting a null value for a default value

  - by FiveTools

  I have questions that may or may not have a question_group if all the questions do not have a question_group and if I use default if empty like this: question_group defaultQuestion = new question_group {question_group_id = Guid.Empty}; questions.Select(x => x.question_group).DefaultIfEmpty(defaultQuestion).Distinct(); shouldn't I get an IEnumerable<question_group> containing only the default question_group that I defined? I get null.... what am I missing here?

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• Can you create a linked server in SQL Server and then refer to it with an alias

  - by Craig HB

  Can you create a linked server in SQL Server 2008 and then refer to it with an alias. So, I create a linked server to "SalesServer", but I give it the alias "Sales", so I can use it like this: SELECT * FROM Sales.DB1.dbo.DailySales

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• XML to PDF best approach?

  - by MMAmail.com

  I have some xml files which are used to generate my webpages, however I need to be able to allow the user to select a number of pages then combine them into one PDF. This pdf needs to have different styling to the actual web page.(the content is kept in xml files ;) p.s. the pdf must have table of contents... and will include images taken from the website.

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• MySQL query to order by parent then child places

  - by Swanny

  I have a table of pages in my database, each page can have a parent as below: id parent_id title 1 0 Home 2 0 Sitemap 3 0 Products 4 3 Product 1 5 3 Product 2 6 4 Product 1 Review Page What would be the best MySQL query to select all pages ordered by parent then child then child again if there is more than one level, there will be a maximum of three levels. The above example would produce the desired order: Home Sitemap Products Product 1 Product 1 Review Page Product 2

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• Win32: edit control selection in dialog-based app

  - by Lars Kanto

  I have a dialog-based app with an edit-control in it. When I minimize / restore the app, everything's ok. But when I hide all the windows with holding down that Windows-logo-key and pressing "D" and then I restore the app, the edit-control selects everything inside it. How to make it not to select the text on restore?

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• how to restrict anonymous data while using jquery autocomplete plugin

  - by Nizam

  Hi, I am using jQuery autocomplete plugin. I want to restrict the user to select the options only available from autocomplete list and he cannot enter the non available. And the data for autocomplete is from the server and not local. Is there any option to implement it.

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• How to find out whether SqlCe query Has rows?

  - by Tomas

  Hi, In my simple db I use SqlCe and I cannot figure out how to correctly find out whether the query has rows or not. HasRows does not work. So far I have this: _DbCommand.CommandText="SELECT * FROM X" SqlCeDataReader reader=_DbCommand.ExecuteQuery(); if (reader.FieldCount!=0) //I thought it could work (O rows - 0 fields?), but its true even with 0 rows { while (reader.Read()) { // } } Thanks

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• Convert a string to Linq.Expressions or use a string as Selector?

  - by VJ

  Well I have a string now that has the expression value to be evaluated..it has say value "expr=expr.FieldName"... so I want to use this string as Linq.Expression or any other way to query...like Select(str). Please help me out.

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• How can I translate this SQL statement to a Linq-to-SQL approach?

  - by Sergio Tapia

  For example, imagine that I want to see if a user exists in my database: Select * from Users where inputID = Users.ID Then if that result brought 0 items, then the user exists, correct? How can I do something like this using a pure Linq-to-SQL class?

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• get a array use params

  - by Small Wolf

  Hey,Guys! In rails , I met a question! when i use the multiple select ,i don't know ,how can i get the all parameter values ,it likes in javaEE, String[] strs=request.getParameters("aaa"); so,who can tell me the method in rails to realize the function? Thank you in advance!

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• Querying with foreign key

  - by theactiveactor

  Say I have 2 tables whose structures are as follows: tableA id | A1 | A2 tableB id | tableA_id (foreign key) | B1 Entries in A have a one-to-many relationship with entries in B. What kind of query operation would I need to achieve "something like this: select all objects from table B where A1="foo""? Basically, apply a query on tableA and from those result, find corresponding dependent objects in tableB

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• Appropriate C# command for ADO.NET SQlite when implementing COUNT() query

  - by Soham

  Hi All, Consider this command, as written here: Command.CommandText = "SELECT COUNT(ASSET) AS POSEXISTS FROM POSITIONS WHERE ASSET = @ASSET"; Command.Parameters.Add("@ASSET",DbType.String).Value = Symbol; So here, how should I execute this query so that, I can receive the POSEXISTS variable in the C# environment. Soham

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• SQL Server - In clause with a declared variable

  - by Melursus

  Let say I got the following : DECLARE @ExcludedList VARCHAR(MAX) SET @ExcludedList = 3 + ', ' + 4 + ' ,' + '22' SELECT * FROM A WHERE Id NOT IN (@ExcludedList) Error : Conversion failed when converting the varchar value ', ' to data type int. I understand why the error is there but I don't know how to solve it...

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• how can i loop through all of the columns of the OracleDataReader

  - by ooo

  I have the following code and i want to loop through all the fields in the result of this query and populate the dictionary called field. Given a datareader is this possible? OracleCommand command = connection.CreateCommand(); string sql = "Select * from MYTABLE where ID = " + id; command.CommandText = sql; Dictionary<string, string> fields = new Dictionary<string, string>(); OracleDataReader reader = command.ExecuteReader();

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• sql inner join problem

  - by Luke

  The following SQL query isn't working. I think the error is on the first line. SELECT SUBSTRING(tbl_news.comment, 1, 250) as tbl_news.comment, tbl_news.id, tbl_news.date, tbl_news.subject, tbl_users.username FROM tbl_news INNER JOIN tbl_users ON tbl_news.creator = tbl_users.id ORDER BY date DESC

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• WCF wrapper COM object

  - by LarryR

  I have a third party COM component (they don't offer a .Net assy), that has the additional feature that it only works under x86 compile. I am trying to wrap this in a WCF service, but if I select x86, the service won't start (System.BadImageFormatException). Any workarounds for this ? Thanks Larry

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• MySQL ORDER BY offset

  - by monk.e.boy

  In a MySQL query how would I select: all rows ordered by column 'name' where name 'f' so I'd get Gs, Hs ... Xs, Ys, Zs, As, Bs, Cs ... Fs.

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• selecting the first of multiple classes

  - by gleddy

  Not sure if you can do this, but I want to select the first of two classes of an element with jQuery and return it's first class only. <div class="module blue"> I want to return 'module'. tried this: var state = $('body').attr('class').first(); but none of that seems to work, thanks for any advice.

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• asp:upload postedfile lost during postback

  - by Neil

  I am using an asp:upload control to upload an image and am using the postedfile property to insert the path to the database. In my form I have a dropdown with autopostback=true where the user can select a topic to populate a checkbox list of categories. During that postback, the postedfile value is being lost and after a little research I have discovered that the posted file value is not maintained in viewstate for security reasons. Has anybody else found out how to get around this?

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• Most optimal way to convert to date

  - by IMHO

  I have legacy system where all date fields are maintained in YMD format. Example: 20101123 this is date: 11/23/2010 I'm looking for most optimal way to convert from number to date field. Here is what I came up with: declare @ymd int set @ymd = 20101122 select @ymd, convert(datetime, cast(@ymd as varchar(100)), 112) This is pretty good solution but I'm wandering if someone has better way doing it

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• Oracle : Identifying duplicates in a table without index

  - by user288031

  When I try to create a unique index on a large table, I get a unique contraint error. The unique index in this case is a composite key of 4 columns. Is there an efficient way to identify the duplicates other than : select col1, col2, col3, col4, count() from Table1 group by col1, col2, col3, col4 having count() 1 The explain plan above shows full table scan with extremely high cost, and just want to find if there is another way. Thanks !

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• Excel 2003 VBA : how to paste a shape after selection

  - by Justin

  Just wondering how I can paste an object after I have selected it: sheet1.shapes("MyShape").select With Selection basically jsut wondering how to duplicate a shape object, or any object really. Eventually I am looking to use code to copy a shape object like above from Excel, and paste it into an access form automatically. Thanks!

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• Should I be regularly shrinking my DB or at least my log file?

  - by Tom

  My question is, should I be running one or both of the shrink command regularly, DBCC SHRINKDATABASE OR DBCC SHRINKFILE ============================= background Sql Server: Database is 200 gigs, logs are 150 gigs. running this command SELECT name ,size/128.0 - CAST(FILEPROPERTY(name, 'SpaceUsed') AS int) / 128.0 AS AvailableSpaceInMB FROM sys.database_files;` produces this output.. MyDB: 159.812500 MB free MyDB_Log: 149476.390625 MB free So it seems there is some free space. We backup transaction logs every hour, diff backup 5 nights a week, full backup the other 2 nights of the week.

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• How to access API reference from Xcode ?

  - by CodeFlakes

  I'm tired of switching between xcode and the browser to check iPhone API reference from Apple web site. Any better way to to it directly from XCode ? Ideally I'd like to select a word and search for it in the APi reference automatically.

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• Date and time Query - problem

  - by Gold

  hi i try to run this query: select * from WorkTbl where ((Tdate = '20100414' AND Ttime = '06:00') and (Tdate <= '20100415' AND Ttime <= '06:00')) i have this date: 14/04/2010 and time: 14:00 i cant see hem, how to fix the query ? thank's in advance

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