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  • Parallelizing some LINQ to XML

    - by Lol coder
    How can I make this code run in parallel? List<Crop> crops = new List<Crop>(); //Get up to 10 pages of data. for (int i = 1; i < 10; i++) { //i is basically used for paging. XDocument document = XDocument.Load(string.Format(url, i)); crops.AddRange(from c in document.Descendants("CropType") select new Crop { //The data here. }); }

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  • Linq: How to calculate the sales Total price and group them by product

    - by Daoming Yang
    I have a order list and I want to generate and rank the product with its total sales and quantity. With @tvanfosson's help, I can bring the grouped product detail with the following code, but how can I calculate and add up the total sales and quantity into each productListResult's object? Can anyone help me with this? Many thanks. var orderProductVariantListResult = productList.SelectMany(o => o.OrderProductVariantList) .Select(opv => new { Product = opv.ProductVariant.Product, Quantity = opv.Quantity, PriceSales = opv.PriceSales, Sales = opv.Quantity * opv.PriceSales, }); var productListResult = orderProductVariantResult .Select(pv => pv.Product) .GroupBy(p => p) .Select(g => new { Product = g.Key, TotalOrderCount = g.Count() }) .OrderByDescending(x => x.TotalOrderCount).ToList();

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  • A linq join combined with a regex

    - by Geert Beckx
    Is it possible to combine these 2 queries or would this make my code too complex? Also I think there should be a performance gain by combining these queries since I think in the near future my source table could be over 11000 records. This is what i came up with so far : Dim lit As LiteralControl ' check characters not in alphabet Dim r As New Regex("^[^a-zA-Z]+") Dim query = From o In source.ToTable _ Where r.IsMatch(o.Field(Of String)("nam")) lit = New LiteralControl(String.Format("letter: {0}, count: {1}<br />", "0-9", query.Count)) plhAlpabetLinks.Controls.Add(lit) Dim q = From l In "ABCDEFGHIJKLMNOPQRSTUVWXYZ".ToLower.ToCharArray _ Group Join o In source.ToTable _ On l Equals o.Field(Of String)("nam").ToLowerInvariant(0) Into g = Group _ Select l, g.Count ' iterate the alphabet to generate all the links. For Each letter In q.AsEnumerable lit = New LiteralControl(String.Format("letter: {0}, count: {1}<br />", letter.l, letter.Count)) plhAlpabetLinks.Controls.Add(lit) Next Kind regards, G.

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  • Does AsEnumerable() cache all result (LINQ)

    - by Akshay
    When we call a query operator on a sequence, a sequence-specific operator gets called. I mean if i call Where<>() operator on IEnumerable<>, the operator that will be called will be defined in Enumerable class and if it's called on IQueryable<>, the one defined in Queryable class will be called. Consider the operator Reverse, defined in the Enumerable class. If i want to call it on Iqueryable<> then I must use the AsEnumerable<>() operator to first convert it into IEnumerable<>. db.Countries.OrderBy(cntry=>cntry.CountryName).AsEnumerable().Reverse() But the Reverse operator got to have all records at the same time so that it can reverse them. In the above code do all the records get loaded in memory first and then the Reverse() operator is reversing it ?

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  • Linq to xml : can't load all elements

    - by aleo
    hello i'm trying to load some elements from a xml file. but it XDocument.Load seems not treating xml file properly in this case, the method returns the content of the xml file as one node. here is my xml content: <processes> <process>winamp</process> <process>Acrobat</process> <process>WinRAR</process> </processes> and the code that reads the file: XDocument loaded = XDocument.Load("/process_list.xml"); var x = from a in loaded.Descendants("processes") select a.Element("process"); foreach (var t in x) { Console.WritleLine(t.Value.ToString()); } thank you

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  • "And" condition in C#/LINQ Query

    - by user1213055
    partial void PrintDocLetter1_CanExecute(ref bool result) { if (this.PatientsMasterItem.DoctorsMasterItem != null) { var Doctor = PatientsMasterItem.DoctorsMasterItem; var PatientList = Doctor.PatientsMasterItem; var Letters = PatientsMasterItem.LettersSentItem; if ((PatientList.Count() > 1) && (Letters.Any(i => i.LetterType == "DoctorLetter1"))) { result = false; } else { result = true; } } } I think something is wrong with my second condition. I'm trying to find two things. 1) Doctors with more than 1 patient. 2) Among those patients whether a lettertype called "DoctorLetter1" has been sent or not. The above code is working good for that particular record but not working other patients with same doctors where patient1 has already been sent with DoctorLetter1.

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  • Forcing LINQ to SQL to make one single call for all child rows

    - by zaph0d
    Let say I have a method (example taken from another post): public IQueryable<CityBlock> GetCityBlocks(){ var results = from o in db.city_blocks let buildings = GetBuildingsOnBlock(o.block_id) //returns Iqueryable select new CityBlock { BuildingsOnBlock = buildings, BlockOwner = o.block_owner }; return results; } In the calling method I add Skip() and Take() methods plus some filtering and then do a ToList(). The trouble is that I am getting dozens of database calls - one for all the city blocks and then a separate one for each building. Is there a way that I can refactor this code to just make two calls: one for the city blocks and one for all the buildings

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  • Linq TakeWhile depending on sum (or aggregate) of elements

    - by martinweser
    I have a list of elements and want to takeWhile the sum (or any aggregation of the elements) satisfy a certain condition. The following code does the job, but i am pretty sure this is not an unusual problem for which a proper pattern should exist. var list = new List<int> { 1, 2, 3, 4, 5, 6, 7 }; int tmp = 0; var listWithSum = from x in list let sum = tmp+=x select new {x, sum}; int MAX = 10; var result = from x in listWithSum where x.sum < MAX select x.x; Does somebody know how to solve the task in nicer way, probably combining TakeWhile and Aggregate into one query? Thx

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  • Using Linq to filter parents by their children

    - by Nick L
    Having some problems with my Silverlight app (with RIA services) filtering my results. The idea is on the client I set up the EntityQuery and its filters and call load. However this isn't working for me. Heres my code. public void FireQuery(string filterValue) { EntityQuery<Parent> query = m_ParentDomainContext.GetParentQuery(); query = query.Where(p => p.Children.Any(c => c.Name.Contains(filterValue))); m_ParentDomainContext.Load(query, Query_Completed, null); } Compiles just fine, however, runtime I get "Query operator 'Any' is not supported." Exception. Does anyone know of a good way to filter like this? Again, I'm looking for a way to set this up on the client.

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  • Should a programmer take writing lessons to enhance code expressiveness?

    - by Jose Faeti
    Given that programmers are authors and write code to express abstract thoughts and concepts, and good code should be read by other programmers without difficulties and misunderstandings, should a programmer take writing lessons to write better code? Abstracting concepts and real world problems/entities is an important part of writing good code, and a good mastery of the language used for coding should allow the programmer to express his thoughts more easily, or in a better way. Besides, when trying to write or rewrite some code to make it better, much time can be spent in deciding the names for functions, variables or data structures. I think this could also help to avoid writing code with more than one meaning, often cause of misunderstanding between different programmers. Code should always express clearly its function unambiguously.

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  • Problems with cross forest authentication in SQL Reporting

    - by chunkyb2002
    We're currently running an SQL 2008 R2 Cluster with Reporting Services running, all for use with System Center Operations Manager 2007 R2 (RU3). Our users are on a different domains to the SCOM and SQL servers (we have two domains as we are in the process of a domain migration) We have no problems at all with users accessing reports via the SCOM Console or the Web interface if they are on the new domain which runs at 2008 R2 functional level. However users on the old domain (which runs at a 2003 functional level) cannot access reports on SCOM or via the web interface (http://sqlserver/reports) The error we get is: An error occurred when invoking the authorization extension. (rsAuthorizationExtensionError) For more information about this error navigate to the report server on the local server machine, or enable remote errors Taking the errors advise we logged on to the SQL server as a user on the old domain (which works fine!) and then try to authenticate with the reporting via the web interface which produces this most useful of errors: An error occurred when invoking the authorization extension. (rsAuthorizationExtensionError) The creator of this fault did not specify a Reason. Things we've tried: Recreating the trust between domains Ensuring the SQL Reporting service account was a member of Windows Authorization Access Group on the 2003 domain Added users on the 2003 domain explicitly to the Reporting Users group on the SQL Server Has anyone come across this issue before perhaps in a different scenario? If so how was it resolved? Thanks in advance for any help.

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  • Unable to install SQL 2008 on Windows 7

    - by Axel
    SQL 2008 install hangs on Windows 7 The story: Trying to install SQL2008 on Windows 7 hangs on SqlEngineDBStartconfigAction_install_configrc_Cpu32. What I Tried: Uninstall hangs on validation Manual uninstall using msiinv.exe and msiexec /x works Added SQL service accounts to local admins no help Turn of UAC no help Last lines in setup log: 2010-04-01 16:18:05 SQLEngine: : Checking Engine checkpoint 'GetSqlServerProcessHandle' 2010-04-01 16:18:05 SQLEngine: --SqlServerServiceSCM: Waiting for nt event 'Global\sqlserverRecComplete' to be created 2010-04-01 16:18:07 SQLEngine: --SqlServerServiceSCM: Waiting for nt event 'Global\sqlserverRecComplete' or sql process handle to be signaled 2010-04-01 16:18:07 SQLEngine: : Checking Engine checkpoint 'WaitSqlServerStartEvents' 2010-04-01 16:18:53 Slp: Sco: Attempting to initialize script 2010-04-01 16:18:53 Slp: Sco: Attempting to initialize default connection string 2010-04-01 16:18:53 Slp: Sco: Attempting to set script connection protocol to NotSpecified 2010-04-01 16:18:53 Slp: Sco: Attempting to set script connection protocol to NamedPipes 2010-04-01 16:18:53 SQLEngine: --SqlDatabaseServiceConfig: Connection String: Data Source=\\.\pipe\SQLLocal\MSSQLSERVER;Initial Catalog=master;Integrated Security=True;Pooling=False;Network Library=dbnmpntw;Application Name=SqlSetup 2010-04-01 16:18:53 SQLEngine: : Checking Engine checkpoint 'ServiceConfigConnect' 2010-04-01 16:18:53 SQLEngine: --SqlDatabaseServiceConfig: Connecting to SQL.... 2010-04-01 16:18:53 Slp: Sco: Attempting to connect script 2010-04-01 16:18:53 Slp: Connection string: Data Source=\\.\pipe\SQLLocal\MSSQLSERVER;Initial Catalog=master;Integrated Security=True;Pooling=False;Network Library=dbnmpntw;Application Name=SqlSetup And now comes the fun part: When I open conf mgr I can see the service running, I enabled named pipes and TCP/IP, restarted the service I'm able to connect to the server using an OLE DB connection but not with the Native Client. And what I find suspicious is the following error in my app log: .NET Runtime Optimization Service (clr_optimization_v2.0.50727_32) - Failed to compile: C:\Program Files\Microsoft SQL Server\100\Tools\Binn\VSShell\Common7\Tools\VDT\DataProjects.dll . Error code = 0x8007000b In MS connect this is reported as a bug but MS is unable to reproduce the problem altough when you search the fora I'm not the only one with this problem. So any help is appreciated.

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  • NAT: Exposing SQL Server 2008 Express to the internet

    - by Yves
    Hi, I have a Windows Server 2003 SP2 machine with SQL Server 2008 Express installed. I have my network configured with a NAT. Internal clients can access the instance of SQL Server without a problem. I would like to enable SQL Server to be accessible from anywhere on the the internet. I am not sure how to allow my NAT firewall to allow that. I tried adding the port 1443 to it but I still can't access it from a remote machine. How can you make a given SQL Server available to the WAN? Any help would be greatly appreciated. Thank you

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  • SQL Server 2008 Recovery Mode reverts from FULL to SIMPLE

    - by Eric Hazen
    Three of our SQL databases have their recovery model change every night from FULL to SIMPLE. The only jobs that I'm aware of are two BackupExec jobs that run nightly. Why would the recovery model change? Backup Jobs: SQL FULL BACKUP, SQL LOG BACKUP Event Manager: Event 5084: Setting Database option RECOVERY to SIMPLE for database databaseName

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  • Login failed--password of account must be changed--error 18488

    - by Bill Paetzke
    I failed to connect to a production SQL server. My administrator reset my password, and told me what it was. SQL Server Management Studio gives me this error: Login failed for user 'Bill'. Reason: The password of the account must be changed. (Microsoft SQL Server, Error: 18488) So, how can I reset my password? I tried terminaling into the server with this account, but it said that account doesn't exist. So I guess it's not a regular server account--just SQL server. (if that helps)

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  • Microsoft SQL for PHP driver

    - by Jonas B
    Hello I am running a W2K3 x64 server with IIS 7 + FastCGI + PHP 5.3 (x64) I have trouble geting the SQL for php driver to work. It seems it doesn't get loaded, but no error is thrown. I've doublechedked the php.ini a multitude of times and I'm pretty sure I use the right version of the sql for php driver (version 1.1 CTP) and sql native client x64 is installed. Any ideas what could be wrong? Thanks

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  • MediaWiki on MS Sql Server

    - by kdbolt70
    Hello all, I've been doing some digging on running mediawiki on sql server instead of mySQL, but haven't come across any concrete information. All of our servers are running SQL Server so I'd like to stick with that. I've tried Screwturn wiki, which is an ASP.NET wiki implementation using SQL Server, but I'm not terribly happy with the editing interface, and would really like to get MediaWiki up and running. Does anyone know if this is possible? Thanks!

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  • Error when installing SQL Server 2008 on Windows 7

    - by Luis Caez
    When installing SQL Server 2008 on a Windows 7 machine, it experiences the following error. TITLE: Microsoft SQL Server 2008 Setup ------------------------------ The following error has occurred: Attempted to perform an unauthorized operation. Click 'Retry' to retry the failed action, or click 'Cancel' to cancel this action and continue setup. For help, click: http://go.microsoft.com/fwlink?LinkID=20476&ProdName=Microsoft+SQL+Server&EvtSrc=setup.rll&EvtID=50000&ProdVer=10.0.1600.22&EvtType=0xE32A4906%25400x08A3AE96 Any suggestions on what this unauthorized operation might be?

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  • Sql 2000 Connect From Domain PC to WorkGroup PC using Windows Authentication

    - by bb
    Sql 2000 - I am trying to connect from a PC w/ client tools that is on a domain, to a Sql Server 2000 box that is NOT on the domain using Windows Authentication. I thought I had done this in the past this by creating an account on the non domain PC with the same username/pwd I am logged in on the domain PC, but that doesn't seem to be working. I am specifically looking at using Windows Authentication, I know Sql Authentication works. Any ideas?

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  • log shipping of biztalk database on SQL server 2008 standard edition

    - by Manjot
    Hi, I want to do log shipping for biztalk databases on SQL server 2008 standard edition (server A) to another SQL server 2008 standard edition (server B). I was told that for biztalk, logshipping is not like standard logshipping. I was able to find 2 links: http://msdn.microsoft.com/en-us/library/cc296836%28v=BTS.10%29.aspx http://msdn.microsoft.com/en-us/library/cc296741%28v=BTS.10%29.aspx but they are not talking about SQL 2008 servers. Can anyone please help in this? Thanks in advance

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  • MS SQL Server slows down over time?

    - by Dave Holland
    Have any of you experienced the following, and have you found a solution: A large part of our website's back-end is MS SQL Server 2005. Every week or two weeks the site begins running slower - and I see queries taking longer and longer to complete in SQL. I have a query that I like to use: USE master select text,wait_time,blocking_session_id AS "Block", percent_complete, * from sys.dm_exec_requests CROSS APPLY sys.dm_exec_sql_text(sql_handle) AS s2 order by start_time asc Which is fairly useful... it gives a snapshot of everything that's running right at that moment against your SQL server. What's nice is that even if your CPU is pegged at 100% for some reason and Activity Monitor is refusing to load (I'm sure some of you have been there) this query still returns and you can see what query is killing your DB. When I run this, or Activity Monitor during the times that SQL has begun to slow down I don't see any specific queries causing the issue - they are ALL running slower across the board. If I restart the MS SQL Service then everything is fine, it speeds right up - for a week or two until it happens again. Nothing that I can think of has changed, but this just started a few months ago... Ideas? --Added Please note that when this database slowdown happens it doesn't matter if we are getting 100K page views an hour (busier time of day) or 10K page views an hour (slow time) the queries all take a longer time to complete than normal. The server isn't really under stress - the CPU isn't high, the disk usage doesn't seem to be out of control... it feels like index fragmentation or something of the sort but that doesn't seem to be the case. As far as pasting results of the query I pasted above I really can't do that. The Query above lists the login of the user performing the task, the entire query, etc etc.. and I'd really not like to hand out the names of my databases, tables, columns and the logins online :)... I can tell you that the queries running at that time are normal, standard queries for our site that run all the time, nothing out of the norm.

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  • Unable to add datasource in ColdFusion 9 and SQL Server 2008 R2

    - by Evik James
    I just installed SQL Server 2008 R2 and ColdFusion 9.0.1 on my Windows 7 machine for development use only. I have ColdFusion running well and serving pages (that aren't connected to a database). I can view my databases in SQL Server Management Studio. I successfully restored a few small databases and now I am trying to set up datasources for them through the ColdFusion Administrator. On my other machine, this was super easy. Not so much this time. The database I just added is named "Test". I am getting this error: Connection verification failed for data source: Test java.sql.SQLNonTransientConnectionException: [Macromedia][SQLServer JDBC Driver]Error establishing socket to host and port: localhost:1433. Reason: Connection refused: connect The root cause was that: java.sql.SQLNonTransientConnectionException: [Macromedia][SQLServer JDBC Driver]Error establishing socket to host and port: localhost:1433. Reason: Connection refused: connect It looks like the connection between ColdFusion and SQL Server is being refused. I know, brilliant observation, right? On my other machine, I was able to create datasources with just the default settings, no server name, username, or password. Any clue as to what might be the cause and how I might fix it?

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  • SQL Server High Availability - Mirroring with MSCS?

    - by David
    I'm looking at options for high-availability for my SQL Server-powered application. The requirements are: HA protection from storage failure. Data accessibility when one of the DB servers is undergoing software updates (e.g. planned outage for Windows Update / SQL Server service-packs). Must not involve much in the way of hardware procurement. The application is an ASP.NET web application. The web application's users have their own database instances. I've seen two main options: SQL Server failover clustering, and SQL Server mirroring. I understand that SQL Server Failover Clustering requires the purchasing of a shared disk array and doesn't offer any protection if the shared storage goes down (so the documentation recommends to set up a Mirroring between two clusters). Database Mirroring seems the cheaper option (as it only requires two database servers and a simple witness box) - but I've heard it doesn't work well when you have a large number of databases. The application I'm developing involves giving each client their own database for their application - there could be hundreds of databases. Setting up the mirroring is no problem thanks to the automation systems we have in place. My final point concerns how failover works with respect to client connections - SQL Server Failover Clustering uses MSCS which means that the cluster is invisible to clients - a connection attempt might fail during the failover, but a simple reconnect will have it working again. However mirroring, as far as I know, requires that the client be aware of the mirrored partners: if the client cannot connect to the primary server then it tries the secondary server. I'm wondering how this work with respect to Connection Pooling in ASP.NET applications - does the client connection failovering mean that there's a potential 2-second (assuming 2000ms TCP timeout policy) pause when the connection pool tries the primary server on every connection attempt? I read somewhere that Mirroring can be used on top of MSCS which means that the client does not need to be aware of mirroring (so there wouldn't be any potential delays during connection, and also that no changes would need to be made to the client, not even the connection string) - however I'm finding it hard to get documentation or white papers on this approach. But if true, then it means the best method is then Mirroring (for HA) with MSCS (for client ignorance and connection performance). ...but how does this scale to a server instance that might contain hundreds of mirrored databases?

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  • SQL Server 2008 Copy Database Wizard: Fail

    - by Nai
    I am trying to use the SQL Server 2008 Copy Database Wizard to copy a SQL Server 2008 database. I am using the SQL Management Object method. However, the copy fails with the following error: ERROR : errorCode=-1073548784 description=Executing the query "/* '==============================================..." failed with the following error: "Cannot use a CONTAINS or FREETEXT predicate on table or indexed view 'Product' because it is not full-text indexed." Any ideas on how I can proceed with this will be super helpful Kind Regards Nai

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