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• SQl rows to columns conversion

  - by Thihara

  Hi, I have a table ClassAttendance and I'm using MSSQL 2005 studentID--attendanceDate---------------------------------------status 1004--------2010-03-17--------------------------------------------------0 1005--------2010-03-17--------------------------------------------------1 1006--------2010-03-17--------------------------------------------------0 1007--------2010-03-17--------------------------------------------------0 1004--------2010-03-19--------------------------------------------------0 1005--------2010-03-19--------------------------------------------------1 1006--------2010-03-19--------------------------------------------------0 1007--------2010-03-19--------------------------------------------------0 1004--------2010-03-20--------------------------------------------------1 as you can see studentID is a foreign Key for a table called StudentData and attendedDate has an unknown number of rows. Can i get the output like below by using a query? I need the dates in one month to be columns and the value of the date columns will be values in the status column. The number of date records per studentID is the same its the number of dates in the attendanceDate filed that is unknown. studentID---------2010-03-17--------2010-03-19------2010-03-20 1004-----------------------------0----------------------0--------------------1 etc. This is for a creating a report so I need to do it in a query. Please help if you can.

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• Localized tables and Entity Framework

  - by Pyttroll

  Hi all, I have a scenario where I need to localized values of objects in my database. Let's say you have an application that can create animals, if the user is english the value of the "Name" property of an animal would be entered as "Cat" in the UI whereas it would be entered as "Chat" in french. The animal culture table would contain 2 records pointing to the same animal in the parent table. When reading values back, if the value of "Name" does not exist in the user culture the default value (value the object was originally created with) would be used. The following diagrams demonstrate how the data is stored in SQL: I'm trying to map this schema to an object model using the Entity Framework, I'm a bit confused as to what the best way to approach the problem. Is EF appropriate for this? Should I used EF4? This EF model will be used by .NET RIA Services. Thanks, Pierre-Yves Troel Ayuda Media Systems http://www.ayudasystems.com

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• how to read the txt file from the database(line by line)

  - by Ranjana

  i have stored the txt file to sql server database . i need to read the txt file line by line to get the content in it. my code : DataTable dtDeleteFolderFile = new DataTable(); dtDeleteFolderFile = objutility.GetData("GetTxtFileonFileName", new object[] { ddlSelectFile.SelectedItem.Text }).Tables[0]; foreach (DataRow dr in dtDeleteFolderFile.Rows) { name = dr["FileName"].ToString(); records = Convert.ToInt32(dr["NoOfRecords"].ToString()); bytes = (Byte[])dr["Data"]; } FileStream readfile = new FileStream(Server.MapPath("txtfiles/" + name), FileMode.Open); StreamReader streamreader = new StreamReader(readfile); string line = ""; line = streamreader.ReadLine(); but here i have used the FileStream to read from the Particular path. but i have saved the txt file in byt format into my Database. how to read the txt file using the byte[] value to get the txt file content, instead of using the Path value.

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• Syncronize an SVN repo (svnsync) with encoding errors

  - by Hamish

  Is it possible to fix/bypass non-UTF8 encoded svn:log records when syncronizing repositories with svnsync? Background I'm in the process of taking over the maintenance of an open source module that is stored within a large (well over 10,000 revisions) subversion (1.5.5) repository. I do not have admin access to the remote repository to dump/filter/load the module. The old repository is being discontinued and I am trying to sync the original sub module to my local (1.6+) repository with svnsync. For example: svnsync file://home/svn/temp-repo/ http://path.to.repo/modulename/ The problem is that the old repository didn't enforce UTF8 encoding and I'm hitting errors like: svnsync: Cannot accept 'svn:log' property because it is not encoded in UTF-8 I can't modify the log property in the source repository so I need to somehow modify or ignore the property value when the encoding is unknown/invalid. Any ideas? For example, is it possible to write a pre-revprop-change script to modify the log property in transit?

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• SQL Server adding a record record manually to a view

  - by SelectDistinct

  I have a view which contains the data seen in the image below. The view is showing me how many working days are available in each month for the current financial year taking away any school/bank holidays. As the month of August has zero days available it has excluded this month from the view. As the total number of days available will always be zero for the month of August, then it seems acceptable to hardcode the SQL to always have 0 for August, and also an April-August record which will be the same as April-July. What would be the best way to add these 2 records, and where about in the code should it be placed see example of code layout: see link (answered question) for layout of code: SQL populate total working days per month minus bank holidays for current financial year

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• GROUP BY as a way to pick the first row from a group of similar rows, is this correct, is there any

  - by FipS

  I have a table which stores test results like this: user | score | time -----+-------+------ aaa | 90% | 10:30 bbb | 50% | 9:15 *** aaa | 85% | 10:15 aaa | 90% | 11:00 *** ... What I need is to get the top 10 users: user | score | time -----+-------+------ aaa | 90% | 11:00 bbb | 50% | 9:15 ... I've come up with the following SELECT: SELECT * FROM (SELECT user, score, time FROM tests_score ORDER BY user, score DESC, time DESC) t1 GROUP BY user ORDER BY score DESC, time LIMIT 10 It works fine but I'm not quite sure if my use of ORDER BY is the right way to pick the first row of each group of sorted records. Is there any better practice to achieve the same result? (I use MySQL 5)

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• gridview check duplicates not using sql

  - by Tomasusa

  I have a code: foreach (GridViewRow dr in gvCategories.Rows)<br/> { <br/> if (dr.Cells[0].Text == txtEnterCategory.Text.Trim())<br/> <br/> isError=true; <br/> <br/> } Debugging: dr.Cells[0].Text is always "", even there are records. How to use a loop to check each row to find if a record exists in the gridview not using sql?

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• How to make flash video show up under navigation element?

  - by Deshiknaves

  I know that the wmode needs to be either transparent or opaque for the video to show up under other elements on the page. I've added the wmode to the element and param in object, I still have no luck with it. <object width="400" height="225"><param name="wmode" value="transparent" /><param name="allowfullscreen" value="true" /><param name="allowscriptaccess" value="always" /><param name="movie" value="http://vimeo.com/moogaloop.swf?clip_id=10875088&amp;server=vimeo.com&amp;show_title=1&amp;show_byline=1&amp;show_portrait=0&amp;color=&amp;fullscreen=1" /><embed src="http://vimeo.com/moogaloop.swf?clip_id=10875088&amp;server=vimeo.com&amp;show_title=1&amp;show_byline=1&amp;show_portrait=0&amp;color=&amp;fullscreen=1" type="application/x-shockwave-flash" allowfullscreen="true" allowscriptaccess="always" width="400" height="225" wmode="transparent"></embed></object><p><a href="http://vimeo.com/10875088">Clutchy Hopkins - Verbal Headlock</a> from <a href="http://vimeo.com/ubiquityrecords">Ubiquity Records</a> on <a href="http://vimeo.com">Vimeo</a>.</p>

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• locking database record for editing

  - by sd_dracula

  I have a SQL 2008 DB and an asp.net frontend. I would like to implement a lock when a user is currently editing a record but unsure of which is the best approach. My idea is to have a isLocked column for the records and it gets set to true when a user pulls that record, meaning all other users have read only access until the first user finishes the editing. However, what if the session times out and he/she never saves/updates the record, the record will remain with isLocked = true, meaning others cannot edit it, right? How can I implement some sort of session time out and have isLocked be automatically set to false when the session times out (or after a predefined period) Should this be implemented on the asp.net side or the SQL side?

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• How can I delete from a GridView when DataSource is a DataTable?

  - by David

  My DataSource is a DataTable populated from file system data in Page_Load. There is no database. How can I remove rows from the DataTable and rebind? I thought this had to be done in the GridView_RowCommand "Delete" section... if(e.CommandName == "Delete") ... When I try to access the DataRow's within //get the datatable DataTable dt = this.gridCPCP.DataSource as DataTable; // Delete the record foreach (DataRow dr in dt.Rows) { .... dt is null. How do I reference the DataTable when deleting records?

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• Determining threshold for lock escalation

  - by Davin

  I have a table with around 2.5 millions records and will be updating around 700k of them and want to update these while still allowing other users to see the data. My update statement looks something like this: UPDATE A WITH (UPDLOCK,ROWLOCK) SET A.field = B.field FROM Table_1 A INNER JOIN Table2 B ON A.id = B.id WHERE A.field IS NULL AND B.field IS NOT NULL I was wondering if there was any way to work out at what point sql server will escalate a lock placed on an update statement (as I don't want the whole table to be locked)? I don't have permissions to run a server trace to see how the locks are being applied, so is there any other way of knowing at what point the lock will be escalated to cover the whole table? Thanks!

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• How to figure the read/write ratio in Sql Server?

  - by Bill Paetzke

  How can I query the read/write ratio in Sql Server 2005? Are there any caveats I should be aware of? Perhaps it can be found in a DMV query, a standard report, a custom report (i.e the Performance Dashboard), or examining a Sql Profiler trace. I'm not sure exactly. Why do I care? I'm taking time to improve the performance of my web app's data layer. It deals with millions of records and thousands of users. One of the points I'm examining is database concurrency. Sql Server uses pessimistic concurrency by default--good for a write-heavy app. If my app is read-heavy, I might switch it to optimistic concurrency (isolation level: read uncommitted snapshot) like Jeff Atwood did with StackOverflow.

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• LINQ expression precedence with Skip(), Take() and OrderBy()

  - by Robert Koritnik

  I'm using LINQ to Entities and display paged results. But I'm having issues with the combination of Skip(), Take() and OrderBy() calls. Everything works fine, except that OrderBy() is assigned too late. It's executed after result set has been cut down by Skip() and Take(). So each page of results has items in order. But ordering is done on a page handful of data instead of ordering of the whole set and then limiting those records with Skip() and Take(). How do I set precedence with these statements? My example (simplified) var query = ctx.EntitySet.Where(/* filter */).OrderBy(/* expression */); int total = query.Count(); var result = query.Skip(n).Take(x).ToList();

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• Django Grouping Query

  - by Matt

  I have the following (simplified) models: class Donation(models.Model): entry_date = models.DateTimeField() class Category(models.Model): name = models.CharField() class Item(models.Model): donation = models.ForeignKey(Donation) category = models.ForeignKey(Category) I'm trying to display the total number of items, per category, grouped by the donation year. I've tried this: Donation.objects.extra(select={'year': "django_date_trunc('year', %s.entry_date)" % Donation._meta.db_table}).values('year', 'item__category__name').annotate(items=Sum('item__quantity')) But I get a Field Error on item__category__name. I've also tried: Item.objects.extra(select={"year": "django_date_trunc('year', entry_date)"}, tables=["donations_donation"]).values("year", "category__name").annotate(items=Sum("quantity")).order_by() Which generally gets me what I want, but the item quantity count is multiplied by the number of donation records. Any ideas? Basically I want to display this: 2010 - Category 1: 10 items - Category 2: 17 items 2009 - Category 1: 5 items - Category 3: 8 items

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• Two Tables Serving as one Model in Rails

  - by matsko

  Is is possible in rails to setup on model which is dependant on a join from two tables? This would mean that for the the model record to be found/updated/destroyed there would need to be both records in both database tables linked together in a join. The model would just be all the columns of both tables wrapped together which may then be used for the forms and so on. This way when the model gets created/updated it is just one form variable hash that gets applied to the model? Is this possible in Rails 2 or 3?

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• How to control order of assignment for new identity column in mssql ?

  - by alpav

  I have a table with CreateDate datetime field default(getdate()) that does not have any identity column. I would like to add identity(1,1) field that would reflect same order of existing records as CreateDate field (order by would give same results). How can I do that ? I guess if I create clustered key on CreateDate field and then add identity column it will work (not sure if it's guaranteed), is there a good/better way ? I am interested in sql 2005, but I guess the answer will be the same for sql 2008, sql 2000.

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• WCF large message exception

  - by Saurabh Lalwani

  Hi, I have a web service which is returning data to the desktop application. The problem I am having is, when the web service returns small volume of data everything works fine but when the volume of data is large it throws the following exception: System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive. Can it be because it is taking a good 4-5 seconds to fetch all the records from the database and the session times out or something? Also, when I am debugging the web service, I see that this particular method is called twice and it is also returning the correct value both times, but for some reason the desktop application seems to be throwing the aforementioned exception. I found similar posts before on stackoverflow but they did not solve my problem. Can anybody please tell me what's going on in here? Thanks!

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• Monitor database table for external changes from within Rails application

  - by jhwist

  I'm integrating some non-rails-model tables in my Rails application. Everything works out very nicely, the way I set up the model is: class Change < ActiveRecord::Base establish_connection(ActiveRecord::Base.configurations["otherdb_#{RAILS_ENV}"]) set_table_name "change" end This way I can use the Change model for all existing records with find etc. Now I'd like to run some sort of notification, when a record is added to the table. Since the model never gets created via Change.new and Change.save using ActiveRecord::Observer is not an option. Is there any way I can get some of my Rails code to be executed, whenever a new record is added? I looked at delayed_job but can't quite get my head around, how to set that up. I imagine it evolves around a cron-job, that selects all rows that where created since the job last ran and then calls the respective Rails code for each row.

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• ASP.NET and SQL server with huge data sets

  - by Jake Petroules

  I am developing a web application in ASP.NET and on one page I am using a ListView with paging. As a test I populated the table it draws from with 6 million rows. The table and a schema-bound view based off it have all the necessary indexes and executing the query in SQL Server Management Studio with SELECT TOP 5 returned in < 1 second as expected. But on the ASP.NET page, with the same query, it seems to be selecting all 6 million rows without any limit. Shouldn't the paging control limit the query to return only N rows rather than the entire data set? How can I use these ASP.NET controls to handle huge data sets with millions of records? Does SELECT [columns] FROM [tablename] quite literally mean that for the ListView, and it doesn't actually inject a TOP <n> and does all the pagination at the application level rather than the database level?

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• How to deny payment via PayPal IPN?

  - by Nick

  Hello all, I need to create dynamic 'Pay Now' buttons on my site, and PayPal says the way to do this is via an HTML FORM with preset variables for the price, currency, and item of the purchase. I use PayPal IPN to notify me when a payment has complete. However, what's to stop someone from modifying the query parameters of the Pay Now button to change the price? Some people have told me to redirect the button through a PHP file that sends you to a PayPal payment page with the parameters in place, but the price could just as easily be manipulated in the Web browser's address bar. My question is, how can I deny a payment if the information I receive from PayPal's IPN service is invalid (if the price doesn't match our records)? I'm quite confused and couldn't find any documentation on what I'm looking for. Hopefully, you guys can help. Thanks!

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• Alternative databases to use when putting IIS Logs into a database using LogParser

  - by Robin Day

  We have run some scripts that use LogParser to dump our IIS logs into a SQL Server database. We can then query this to get simple stats on hits, usage etc. It's also good when linking it to error log databases and performance counter database to compare usage with errors, etc. Having implemented this for just one system and for the last 2-3 weeks we already have a 5GB database with around 10 million records. This is making any queries to this database quite slow and will no doubt cause storage issues if we continue to log as we are. Can anyone suggest any alternative databases that we could use for this data that would be more efficient for such logs? I'd be particularly interested in any experience of Google's BigTable or Amazon's SimbleDB. Are either of these suitable for reporting queries? COUNTs, GROUP BYs, PIVOTs?

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• Can a .csv file be used as a data source in Visual Studio 2008?

  - by Kevin

  I'm pretty new to C# and Visual Studio. I'm writing a small program that will read a .csv file and then write the records read to a SQL Server database table. I can manually parse the .csv file, but I was wondering if it is possible to somehow "describe" the .csv file to Visual Studio so that I can use it as a data source? I should mention that the first two lines in the .csv file contain header information and the following lines are the actual comma-delimited data. Also, I should mention that this program is a stand-alone console program with no user interface.

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• Shrink database after removing extra data

  - by Sergey Osypchuk

  We have a need to fit database in 4G in order to use ms sql express edition. I started from 7G database, and found a lot of not needed records, and deleted them. After Shrink database size is 4.6G, and 748MB is free (according to database properties). However, when i execute exec sp_spaceused i am having interesting results: DatabaseName Database_size unallocation space xxxxxx 4726.50 MB 765.42 MB Reserved Data index_size unused 3899472 KB 1608776 KB 1448400 KB 842296 KB Any ideas, how can i bite at least some of this unused space? Also I know table, which occupied it. update: is it worth to try to rebuild table indexes? ALTER INDEX ALL ON Production.Product REBUILD

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• MySQL, how can I SELECT WHERE one field value doesn't occurs in another?

  - by Jules

  I'm trying to do a search on my test server, speed isn't so important. I want to find if a phrase, the whole contents of one field, occurs in any part (as a whole) doesn't occur in another field. Heres my current query which finds if the phrase does occur SELECT pads.padid, pads.programname, keywords.word FROM Pads JOIN keywords ON Pads.Padid = keywords.Padid WHERE pads.Programname = keywords.word AND RemoveMeDate = '2001-01-01 00:00:00' My problem is that the field word contains other words too. I need to produce a count of where there isn't a keywords record with keywords.word equal to pads.programname ? EDIT: So if I have these records Pads: PadID=3 ProgramName=my prog PadID=4 ProgramName=Bad prog PadID=5 ProgramName=Good prog PadID=6 ProgramName=other prog Keywords: PadID=3 word=fox prog PadID=3 word=pig prog PadID=4 word=big prog PadID=4 word=nice prog PadID=5 word=fox prog PadID=6 word=bad prog PadID=6 word=fox prog The query I want would retun a count of 3 and record 6 has bad prog

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• MySQL - Sort on a calculated value based on two dates

  - by Petter Magnusson

  I have the following problem that needs to be solved in a MySQL query: Fields info - textfield date1 - a date field date2 - a date field offset1 - a text field with a number in the first two positions, example "10-High" offset2 - a text field with a number in the first two positions, example "10-High" I need to sort the records by the calculated "sortvalue" based on the current date (today): If today=date2 then sortvalue=offset1*10+offset2*5+1000 else sortvalue=offset1*10+offset2*5 I have quite good understanding of basic SQL with joins etc, but this I am not even sure if its possible...if it helps I could perhaps live with a single formula giving the same sort of effect as the IFs do....ie. before date1 = low value, after date2 = high value... Rgds PM

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