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• Sort data using DataView

  - by Kristina Fiedalan

  I have a DataGridView with column Remarks (Passed, Failed). For example, I want to show all the records Failed in the column Remarks using DataView, how do I do that? Thank you. Here's the code I'm working on: ds.Tables["Grades"].PrimaryKey = new DataColumn[] { ds.Tables["Grades"].Columns["StudentID"] }; DataRow dRow = ds.Tables["Students"].Rows.Find(txtSearch.Text); DataView dataView = new DataView(dt); dataView.RowFilter = "Remarks = " + txtSearch.Text; dgvReport.DataSource = dataView;

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• Quadratic Bezier Curve: Calculate Tangent

  - by stefan.at.wpf

  I have a quadratic bezier curve and I want to calculate the slope of the tangent in a given point. For example, let it be the middlepoint of the quadratic bezier curve, therefore t=0.5 (please see the link below for a picture of this). I've calculated the first derivative of the formula for the quadratic bezier curve; however I get 400 as value for the slope, though it should be 0. Maybe I'm using the first derivative in a wrong way? I know I could also calculate the tangents using trigonometric functions; however I'd like to do it using the first derivative, shouldn't this be possible? Thanks for any hint! For clarification / please note: I'm interested in a general way to get the slope in a arbitrary given point on a quadratic bezier curve, not only to get the tangent in the start- and end point. A picture of my problem including the text above: http://cid-0432ee4cfe9c26a0.skydrive.live.com/self.aspx/%c3%96ffentlich/Quadratic%20Bezier%20Curve.pdf Thank you very much for any hint!

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• Column locking in innodb?

  - by ming yeow

  I know this sounds weird, but apparently one of my columns is locked. select * from table where type_id = 1 and updated_at < '2010-03-14' limit 1; select * from table where type_id = 3 and updated_at < '2010-03-14' limit 10; the first one would not finish running even in a few hours, while the second one completes smoothly. the only difference is the type_id between the 2 queries. a bit of background, the first statement screwed up before which i had to kill manually. Thanks in advance for your help - i have an urgent data job to finish, and this problem is driving me crazy

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• MDX - Using "iif" function in the "Where" section

  - by Duc Duy Nguyen

  Hi I'd like to know how to make that "iif" work. Basically, I need to filter the engineering "product codes" when originator is "John Smith". currentmember is not working or that iif is not working, SELECT { ( [Time].[Fiscal Hierarchy Time Calculations].[Month to Date], [Measures].[Sell - Bookings] ) } ON COLUMNS, [Originators].[Originator One Letter Name].Children ON ROWS FROM [Sales] WHERE ( [Time].[Fiscal Month].&[2010-02-01T00:00:00], IIF ( [Originators].[Originator One Letter Name].CurrentMember = "John Smith", Except ( [Product Codes].[Product Primary Subcategory].Children, [Product Codes].[Product Primary Subcategory].&[ENGINEERING] ), [Product Codes].[Product Primary Subcategory].Children ) ); Any ideas? Thanks in advance. Duy

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• searching for address matches using sql server 2008 full text search

  - by Sridhar

  Hi, I am not sure how to search for address matches using sql server 2008 full text search. This is what I tried but it doesn't return any records. TableA ------ Address1 Address2 City State Zip All the above columns in the table are full text indexed. Let's say if the user enters "123 Apple street FL 33647" and I have a record in the table as Address1 = "123" , Address2 = "Apple street", City = "Tampa", State = "FL" and Zip = "33647" I would like the query to return this. can you please let me know how I would do this. query tried -------------- SELECT * FROM TableA WHERE CONTAINS((Address1, Address2, City, State, zip), N'FORMSOF(THESAURUS, 123AppleStreetFL33647)'); If I put spaces in the search word, it is giving syntax error. Thanks, sridhar.

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• Nested SELECT clause in SQL Compact 3.5

  - by Sasha

  In this post "select with nested select" I read that SQL Compact 3.5 (SP1) support nested SELECT clause. But my request not work: t1 - table 1 t2 - table 2 c1, c2 = columns select t1.c1, t1.c2, (select count(t2.c1) from t2 where t2.id = t1.id) as count_t from t1 Does SQL Compact 3.5 SP1 support nested SELECT clause in this case? Update: SQL Compact 3.5 SP1 work with this type of nested request: SELECT ... from ... where .. IN (SELECT ...) SELECT ... from (SELECT ...)

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• Customizing an item's view in SharePoint Designer

  - by agnieszka

  I've created a list called Newsletters (columns: Title, Date and News - a multi lookup to a News list), and a DataFormWebPart displaying an item from this list. Now I'm modifing the XSLT transformation to change the displayed view. At the moment an item is simply displayed with its Title, Date and News attributes, where News attribute is displayed as a list of News items titles - this is the default. Instead of the titles, I would like to also display these news' Content. The problem is that I have no idea how to get to these elements. The News attribute is being referred in xslt simply as <xsl:value-of select="@News"/> and I can't get to the elements that lie behind it. Any suggestions on how I can do it?

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• PLT Scheme Extracting field ids from structures

  - by Steve Knight

  I want to see if I can map PLT Scheme structure fields to columns in a DB. I've figured out how to extract accessor functions from structures in PLT scheme using the fourth return value of: (struct-type-info) However the returned procedure indexes into the struct using an integer. Is there some way that I can find out what the field names were at point of definition? Looking at the documentation it seems like this information is "forgotten" after the structure is defined and exists only via the generated-accessor functions: (<id>-<field-id> s). So I can think of two possible solutions: Search the namespace symbols for ones that start with my struct name (yuk); Define a custom define-struct macro that captures the ordered sequence of field-names inside some hash that is keyed by struct name (eek).

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• Hiding Row in DataGridView Very Slow

  - by Ed Schwehm

  I have a DataGridView in a Winforms app that has about 1000 rows (unbound) and 50 columns. Hiding a column takes a full 2 seconds. When I want to hide about half the rows, this becomes a problem. private void ShowRows(string match) { this.SuspendLayout(); foreach (DataGridViewRow row in uxMainList.Rows) { if (match == row.Cells["thisColumn"].Value.ToString())) { row.Visible = false; } else { row.Visible = true; } } this.ResumeLayout(); } I did some testing by adding by addingConsole.WriteLine(DateTime.Now)around the actions, androw.Visible = falseis definitely the slow bit. Am I missing something obvious, like setting IsReallySlow = false? Or do I have to go ahead and enable Virtual Mode and code up the necessary events?

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• Synchronizing scroll positions for 2 WPF DataGrids

  - by Philipp Schmid

  I am trying to synchronize the horizontal scroll position of 2 WPF DataGrid controls. I am subscribing to the ScrollChanged event of the first DataGrid: <toolkit:DataGrid x:Name="SourceGrid" ScrollViewer.ScrollChanged="SourceGrid_ScrollChanged"> I have a second DataGrid: <toolkit:DataGrid x:Name="TargetGrid"> In the event handler I was attempting to use the IScrollInfo.SetHorizontalOffset, but alas, DataGrid doesn't expose IScrollInfo: private void SourceGrid_ScrollChanged(object sender, ScrollChangedEventArgs e) { ((IScrollInfo)TargetGrid).SetHorizontalOffset(e.HorizontalOffset); // cast to IScrollInfo fails } Is there another way to accomplish this? Or is there another element on TargetGrid that exposes the necessary IScrollInfo to achieve the synchronization of the scroll positions? BTW, I am using frozen columns, so I cannot wrap both DataGrid controls with ScrollViewers.

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• Displaying the selected item differently in ComboBox

  - by David Brunelle

  I have a combo box in which I set up an ItemTemplate that looks something like this: <ComboBox.ItemTemplate> <DataTemplate> <StackPanel Orientation="Horizontal"> <TextBlock Text="{Binding Piece.NoPiece}" Width="50" /> <TextBlock Text="{Binding Piece.Description}" Width="170" /> <TextBlock Text="{Binding Piece.Categorie.NomCategorie}" /> </StackPanel> </DataTemplate> </ComboBox.ItemTemplate> As you can see, I got three columns that let the user see different piece of information. However, I would like the selected item in the combo to display only the second column. In other word, is there a way to have an ItemTemplate that displays items in a different manner when you scroll down versus when it's closed and you only see the selection?

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• how should I order my divs?

  - by aslum

  Here's the basic layout of a page I'm working on: What would be the best/easiest way to order the divs? C may or may not be visible (it's a news alert that only displays when there is news). A = Header, B = Menu, E&F = standard content columns, D = latest blog post. I'm thinking ABCEFD might make the most sense, but I could also see ABCDEF. Either of those should be fairly easy to do right using floats... is there a better way? Maybe put CEF inside a "middle column" div?

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• Which is the most memory leak safe approach.

  - by MattC

  I have a table of frequently updated information. This is presented using a container div with a div for each row, each row containing 10 divs. I am using setInterval to call a an asmx webservice that returns some json formatted information. On the success callback I call $("#myContainer").empty(); on the container div and recreate the rows and 10 nested divs for each row's columns. This page may be left to run for a whole day, so I am wary of updating the DOM like this as I have noticed that memory does rise for the browser over time (IE8). The other approach I am considering is to add an idea to the row div. When new results process each item of data, look for the corresponding row, if it exists overwrite the data in each div. If it doesn't exist (new data for example), append the row. What approaches have others used for this sort of long lived pseudo realtime information display. TIA

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• SQL: Need to SUM on results that meet a HAVING statement

  - by Wasauce

  I have a table where we record per user values like money_spent, money_spent_on_candy and the date. So the columns in this table (let's call it MoneyTable) would be: UserId Money_Spent Money_Spent_On_Candy Date My goal is to SUM the total amount of money_spent -- but only for those users where they have spent more than 10% of their total money spent for the date range on candy. What would that query be? I know how to select the Users that have this -- and then I can output the data and sum that by hand but I would like to do this in one single query. Here would be the query to pull the sum of Spend per user for only the users that have spent 10% of their money on candy. SELECT UserId, SUM(Money_Spent), SUM(Money_Spent_On_Candy) / SUM(Money_Spent) AS PercentCandySpend FROM MoneyTable WHERE DATE >= '2010-01-01' HAVING PercentCandySpend > 0.1;

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• Firing trigger for bulk insert

  - by Deepa

  ALTER TRIGGER [dbo].[TR_O_SALESMAN_INS] ON [dbo].[O_SALESMAN] AFTER INSERT AS BEGIN -- SET NOCOUNT ON added to prevent extra result sets from -- interfering with SELECT statements. SET NOCOUNT ON; -- Insert statements for trigger here DECLARE @SLSMAN_CD NVARCHAR(20) DECLARE @SLSMAN_NAME NVARCHAR(20) SELECT @SLSMAN_CD = SLSMAN_CD,@SLSMAN_NAME=SLSMAN_NAME FROM INSERTED IF NOT EXISTS(SELECT * FROM O_SALESMAN_USER WHERE SLSMAN_CD = @SLSMAN_CD) BEGIN INSERT INTO O_SALESMAN_USER(SLSMAN_CD, PASSWORD, USER_CD) VALUES(@SLSMAN_CD, @SLSMAN_CD,@SLSMAN_NAME ) END END This is the trigger written for a table(O_SALESMAN) to fetch few columns from it and insert it into one another table(O_SALESMAN_USER). Presently bulk data is getting inserted into O_SALESMAN table through a stored procedure, where as the trigger is getting fired only once and O_SALESMAN_USER is having only one record inserted each time whenever the stored procedure is being executed,i want trigger to run after each and every record that gets inserted into O_SALESMAN such that both tables should have same count which is not happening..so please let me know what can be modified in this Trigger to achieve the same....

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• facing problems while updating rows in hbase

  - by sammy

  Hello i've just started exploring hbase i've run samples : SampleUploader,PerformanceEvaluation and rowcount as given in hadoop wiki: http://wiki.apache.org/hadoop/Hbase/MapReduce The problem im facing is : table1 is my table with the column family column create 'table1','column' put 'table1','row1','column:address','SanFrancisco' hbase(main):020:0 scan 'table1' ROW COLUMN+CELL row1 column=column:address, timestamp=1276351974560, value=SanFrancisco put 'table1','row1','column:name','Hannah' hbase(main):020:0 scan 'table1' ROW COLUMN+CELL row1 column=column:address,timestamp=1276351974560,value=SanFrancisco row1 column=column:name, timestamp=1276351899573, value=Hannah i want both the columns to appear in the same row as a different version similary, if i change the name column to sarah, it shows the updated row.... but i want both the old row and the changed row to appear as 2 different versions so that i could make analysis on the data........ whatis the mistake im making???? thank u a lot sammy

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• need thoughts on my interview question - .net, c#

  - by uno

  One of the questions I was asked was that I have a database table with following columns pid - unique identifier orderid - varchar(20) documentid - int documentpath - varchar(250) currentLocation - varchar(250) newlocation - varchar(250) status - varchar(15) I have to write a c# app to move the files from currentlocation to newlocation and update status column as either 'SUCCESS' or 'FAILURE'. This was my answer Create a List of all the records using linq Create a command object which would be perform moving files using foreach, invoke a delegate to move the files - use endinvoke to capture any exception and update the db accordingly I was told that command pattern and delegate did not fit the bill here - i was aksed to think and implement a more favorable GoF pattern. Not sure what they were looking for - In this day and age, do candidates keep a lot of info on head as one always has google to find any answer and come up with solution.

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• How2 display Image from DB in datagrid?

  - by Saverio Tedeschi

  Hope it's not yet been answered, but I've googled for quite a long time, and I've not been able to get it working. In brief, I've a SL4 page with a DataGrid filled accordingly to parameters passed from the previous page, so I fill the context in code, with a "RIA" query (w/parameters as well). So far, so good. I get the XAML declared columns as expected but the Photo templated column, which holds just an image control. I think I can use the LoadingRow event, but can some1 give me some code on how to get my goal (image is in in the context from DB)? Thanks in advance

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• XML output from MySQL

  - by NumberFour

  Hi, is there any chance of getting the output from a MySQL query directly to XML? Im referring to something like MSSQL has with SQL-XML plugin, for example: SELECT * FROM table WHERE 1 FOR XML AUTO returns text (or xml data type in MSSQL to be precise) which contains an XML markup structure generated according to the columns in the table. With SQL-XML there is also an option of explicitly defining the output XML structure like this: SELECT 1 AS tag, NULL AS parent, emp_id AS [employee!1!emp_id], cust_id AS [customer!2!cust_id], region AS [customer!2!region] FROM table FOR XML EXPLICIT which generates an XML code as follows: <employee emp_id='129'> <customer cust_id='107' region='Eastern'/> </employee> Do you have any clues how to achieve this in MySQL? Thanks in advance for your answers.

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• SQL DISTINCT Value Question

  - by CPOW

  How can I filter my results in a Query? example I have 5 Records John,Smith,apple Jane,Doe,apple Fred,James,apple Bill,evans,orange Willma,Jones,grape Now I want a query that would bring me back 3 records with the DISTINCT FRUIT, BUT... and here is the tricky part, I still want the columns for First Name , Last Name. PS I do not care which of the 3 it returns mind you, but I need it to only return 3 (or what ever how many DISTINCT fruit there are. ex return would be John,Smith,apple Bill,evans,orange Willma,Jones,grape Thanks in advance I've been banging my head on this all day.

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• MySQL index cardinality - performance vs storage efficiency

  - by Sean

  Say you have a MySQL 5.0 MyISAM table with 100 million rows, with one index (other than primary key) on two integer columns. From my admittedly poor understanding of B-tree structure, I believe that a lower cardinality means the storage efficiency of the index is better, because there are less parent nodes. Whereas a higher cardinality means less efficient storage, but faster read performance, because it has to navigate through less branches to get to whatever data it is looking for to narrow down the rows for the query. (Note - by "low" vs "high", I don't mean e.g. 1 million vs 99 million for a 100 million row table. I mean more like 90 million vs 95 million) Is my understanding correct? Related question - How does cardinality affect write performance?

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• CHtmlView class and focus

  - by NativeByte

  I have an SDI application written in MFC. The frame is divided into 1 row and 2 columns using a splitter window. Below are details of Row and Column (R0C0 means Row#0 and Col#0) R0C0 view is a CFormView with multiple input controls like text box, combo box etc. R0C1 view is a CHtmlView that contains HTML content relavant to the control that has input focus in the R0C0 I am able to update the HTML content and also invoke Javascript functions through my MFC code. Problem: When user clicks on the R0C1, continaing CHtmlView, the focus is now on the html page. I wish to allow the user to tab out of R0C1 using the key board and return back to R0C0. Can you help with this please? The user can obviously click on the R0C0 view using mouse but we have a user who needs to use Keyboard for using this functionality. Let me know if the question is not descriptive enough and I'll simplify it further. Appreciate your time. Thanks, Byte

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• Problem with copying local data onto HDFS on a Hadoop cluster using Amazon EC2/ S3.

  - by Deepak Konidena

  Hi, I have setup a Hadoop cluster containing 5 nodes on Amazon EC2. Now, when i login into the Master node and submit the following command bin/hadoop jar <program>.jar <arg1> <arg2> <path/to/input/file/on/S3> It throws the following errors (not at the same time.) The first error is thrown when i don't replace the slashes with '%2F' and the second is thrown when i replace them with '%2F': 1) Java.lang.IllegalArgumentException: Invalid hostname in URI S3://<ID>:<SECRETKEY>@<BUCKET>/<path-to-inputfile> 2) org.apache.hadoop.fs.S3.S3Exception: org.jets3t.service.S3ServiceException: S3 PUT failed for '/' XML Error Message: The request signature we calculated does not match the signature you provided. check your key and signing method. Note: 1)when i submitted jps to see what tasks were running on the Master, it just showed 1116 NameNode 1699 Jps 1180 JobTracker leaving DataNode and TaskTracker. 2)My Secret key contains two '/' (forward slashes). And i replace them with '%2F' in the S3 URI. PS: The program runs fine on EC2 when run on a single node. Its only when i launch a cluster, i run into issues related to copying data to/from S3 from/to HDFS. And, what does distcp do? Do i need to distribute the data even after i copy the data from S3 to HDFS?(I thought, HDFS took care of that internally) IF you could direct me to a link that explains running Map/reduce programs on a hadoop cluster using Amazon EC2/S3. That would be great. Regards, Deepak.

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• Indentation (and wrap-indentation) of debug strings output by printf()/fprintf() in C program

  - by mbaitoff

  I'm using a debug output using printf() in my functions, but the output goes to the console starting at the 1st columns. I'd like to distinguish the nesting level of functions by indenting their output strings each time I dive into the function (it's implemented easily having a static int indentlevel; variable, which is incremented at the beginning of a function, used as a space-filler-count and decremented at the end). But the flaw is that once the output line becomes too long to be wrapped at the console edge, lines' wrapped parts start at column 1 of the console. Should I take care about this, since once the output is redirected to a file, lines are, say, one-line-length, and widths of the lines depend only on the text file viewer settings?

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• fastercsv parsing to int or other into ActiveRecord

  - by Schroedinger

  I'm currently importing a CSV into an activerecord element but can't choose to parse the elements as say ints or decimals on a case by case basis using fastercsv. I can either choose to parse everything as an int or the other, or all as strings. I need to parse some columns as ints, some as decimals and some as strings. Otherwise, is there a way after I've parsed everything as strings to convert and update individual elements in the activerecord to the new form? Say parse values in as strings then convert certain values to ints, others to decs, etc?

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