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• What is the purpose of "do!" notation in F#?

  - by Yacoder

  I'm a beginner in F#, so it's a simple question and maybe a duplicate, but I couldn't find the answer anywhere... I'm reading this LOGO DSL implementation and I don't understand, what is the meaning of the "do!" notation in here: this.Loaded.Add (fun _ -> async { do! Async.Sleep 200 for cmd in theDrawing do do! this.Execute(cmd) } |> Async.StartImmediate ) Can you help?

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• Help with MySQL query

  - by Michael S.

  I have a table that contains the next columns: ip(varchar 255), index(bigint 20), time(timestamp) each time something is inserted there, the time column gets current timestamp. I want to run a query that returns all the rows that have been added in the last 24 hours. This is what I try to execute: SELECT ip, index FROM users WHERE ip = 'some ip' AND TIMESTAMPDIFF(HOURS,time,NOW()) < 24 And it doesn't work. Can someone help me out? Thanks :)

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• mysql multiple insert - what happens on error?

  - by aviv

  What happens in mysql multiple records insert during an error. I have a table: id | value 2 | 100 UNIQUE(id) Now i try to execute the query: INSERT INTO table(id, value) VALUES (1,10),(2,20),(3,30) I will get a duplicate-key error for the (2,20) BUT... Will the (1,10) get into the database? Will the (3,30) get into the database?

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• google app engine (python): ImportError no module named django.

  - by Phil

  So I'm trying to use the django 1.1 template engine with the google app engine web app framework, from here. This is on Ubuntu Jaunty, I've made sure that the PYTHONPATH contains the location of Django-1.1.1 yet I'm getting this 'ImportError: No module named django' error when it tries to execute the use_library() line below. Again, could somebody help me? I'm stumped. import os os.environ['DJANGO_SETTINGS_MODULE'] = 'settings' from google.appengine.dist import use_library use_library('django', '1.1')

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• Enity sql to pass parameter and get one back?

  - by molgan

  Hello I am using entity framework that comes with 3.5sp1, and I need to execute a stored and pass 2 parameters, @a int @b int, and get 1 @somedate datetime back. How is that done using entity sql and c#? /M

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• Advanced count and join in Rails

  - by trobrock

  I am try to find the top n number of categories as they relate to articles, there is a habtm relationship set up between the two. This is the SQL I want to execute, but am unsure of how to do this with ActiveRecord, aside from using the find_by_sql method. is there any way of doing this with ActiveRecord methods: SELECT "categories".id, "categories".name, count("articles".id) as counter FROM "categories" JOIN "articles_categories" ON "articles_categories".category_id = "categories".id JOIN "articles" ON "articles".id = "articles_categories".article_id GROUP BY "categories".id ORDER BY counter DESC LIMIT 5;

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• ValidateInputAttribute bug in VS 2010 RC / ASP.NET MVC 2.0?

  - by Ben

  Am I doing something wrong here? I have a text area on a view and am posting back the html contents. In VS 2008 and MVC 1.0 the following code successfully prevents input validation: [HttpPost] [ValidateInput(false)] public ActionResult Index(int? id) { return View(); } If I execute this code in VS 2010 / MVC 2.0 I always get this error: A potentially dangerous Request.Form value was detected from the client (body=""). Any ideas?

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• Cannot have a qualifier in the select list while performing a JOIN w/ USING keyword.

  - by JuiceBerry123

  I am looking at a practice test that doesn't have explanations about the correct answers. The question I'm confused about basically asks why the following SQL statement can never work: SELECT oi.order_id, product_jd, order_date FROM order_items oi JOIN orders o USING(order_id); The answer it gave was: "The statement would not execute because the column part of the USING clause cannot have a qualifier in the SELECT list" Can someone elaborate on this? I am pretty stumped.

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• how to make the batch file wait until another batch file completes execution?

  - by Arunachalam

  how to make the batch file wait until another batch file completes execution? let me explain with an example. echo hi >r.txt echo some piece of code >>r.txt start ar.bat echo some piece of coe >>ar.txt i want the code after start ar.bat to execute after this batch file exits .. i have tried without start it works but i want to run it in a seperate window ..is there any function to check whether that window which is running ar.bat is present ?

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• App Engine datastore does not support operator OR

  - by JohnIdol

  I am trying to query the google datastore for something like (with pm -- persistanceManager): String filters = "( field == 'value' || field == 'anotherValue' )"; Query query = pm.newQuery(myType.class, filters); When I execute - I am getting back: App Engine datastore does not support operator OR. What's the best approach in people experience for this kind of queries? Any help appreciated!

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• Meassure website

  - by s0mmer

  Hi, I was wondering if it is possible to install or use any online service to measure your website's performance? I've seen many just checking the download speed of images, external files etc. But is it possible to meassure how long asp/php code takes to execute? I have a site running a bit slowly, and it would be very nice with some app/service guiding where to optimize.

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• librrd link problem

  - by farka

  i use rrd (graphic programming ) under rrdtool, i have installed; and i rund gcc gcc -I/usr/include -I/usr/local/include -L/usr/lib -L/usr/local/lib -lrrd -o myprog test.c myprog is execute file and test.c ist testprogram who i use function rrd_create from libary but gcc put out error like this: /usr/bin/ld: cannot find -lrrd why!!!!

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• Is there any way to run "dir" directly?

  - by Mason Wheeler

  In my answer to this question, where the asker needed a fast way to get a directory listing of a folder on a network drive, I suggested using the DOS "dir" command. Unfortunately, it's a command, not a program, so you can't execute it with CreateProcess and so I had to put it in a batch file. I don't really like that solution. It feels like a hack to me. Does anyone know a way to run dir from Delphi instead of from an external batch file?

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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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• cx_Oracle and output variables

  - by Tim

  I'm trying to do this again an Oracle 10 database: cursor = connection.cursor() lOutput = cursor.var(cx_Oracle.STRING) cursor.execute(""" BEGIN %(out)s := 'N'; END;""", {'out' : lOutput}) print lOutput.value but I'm getting DatabaseError: ORA-01036: illegal variable name/number Is it possible to define PL/SQL blocks in cx_Oracle this way?

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• How to convert a table column to another data type

  - by holden

  I have a column with the type of Varchar in my Postgres database which I meant to be integers... and now I want to change them, unfortunately this doesn't seem to work using my rails migration. change_column :table1, :columnB, :integer So I tried doing this: execute 'ALTER TABLE "table1" ALTER COLUMN "columnB" TYPE integer USING CAST(columnB AS INTEGER)' but cast doesn't work in this instance because some of the column are null... any ideas?

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• Doctrine Update by DQL + field with parenthesis: "(" and ")"

  - by Paulo

  Hello! I have a doctrine update query to save my data: $customer = Doctrine_Query::create() -update('Customer') -set('fax',"'". $this-getRequest()-getParam('fax')."'") -where('id ='.$this-getRequest()-getParam('id')) -execute(); The problem is that the field fax has parenthesis and doctrine returns an error in the query because of these parenthesis "(" and ")". Somebody knows a solution for this? Thank's

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• Helping Kohana 3 ORM to speed up a little

  - by Luke

  I noticed that Kohana 3 ORM runs a "SHOW FULL COLUMNS" for each of my models when I start using them: SHOW FULL COLUMNS FROM `mytable` This query might take a few clock cycles to execute (in the Kohana profiler it's actually the slowest of all queries ran in my current app). Is there a way to help Kohana 3 ORM to speed up by disabling this behaviour and explicitly define the columns in my models instead?

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• how can I put a process in background using django ?

  - by shahjapan

  I tried os.system, os.spwanl, etc.. but it doesn't work well I need to execute some background process from django application.

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• Is using If, ElseIf, ElseIf better than using If, If, If?

  - by Jordan S

  Is there really any difference between using If(this) { } Else If(that) { } Else { } or using, If(this) { } If(that) { } Else { } ? Does one execute any faster? Does the compiler or architecture make any difference?

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• how to use localtime function with VIsual Studio C++ 2008

  - by make

  Hi I am getting this error : "Unhandled exception at 0x00411690 in tim.exe: 0xC0000005: Access violation reading location 0x00000008" when I execute a program this is compiled and linked successfully and the problem is that localtime() function is not correctly recognized by Visual C++ 2008. (With VC++6, this program works fine). Is there any idea and thanks for replies:

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• A question in rails db:migrate

  - by Small Wolf

  Now , I execute the command line "rake db:migrate" on the window OS, but I got the problem in the console. it print couldn't find HOME environment -- expanding~/.ruby-uuid'` who can help me to solve this ? Thank you and best regards!

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• How is the order of execution for HttpModules determined?

  - by jessegavin

  Suppose that both FirstModule and SecondModule handle the Application_BeginRequest event. Will it execute in the order defined in the web.config? <httpModules> <add type="MyApp.FirstModule, MyApp" name="FirstModule"/> <add type="MyApp.SecondModule, MyApp" name="SecondModule"/> <add type="OtherApp.OtherModule, OtherApp" name="OtherModule"/> </httpModules> Are there other ways that the order can be specified?

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• Return ActionResult to a Dialog. ASP.NET MVC

  - by Stacey

  Given a method.. public ActionResult Method() { // program logic if(condition) { // external library // external library returns an ActionResult } return View(viewname); } I cannot control the return type or method of the external library. I want to catch its results and handle that in a dialog on the page - but I cannot figure out how to get back to the page to execute the jQuery that would be responsible for it. Any ideas?

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• Variable popen calls in C

  - by Bushman

  I'm trying to execute MS-DOS DEL commands inside a Win32 C program, and I already know that system and popen can be used for this. However, the problem is that both require string literals (type const char) for the commands, and I need something like the DOS equivalent of dir ~ | grep -P '/\d{7,8}\.exe$/' | rm, which obviously can't use string literals. Is there some other subprocess function in C that allows for char arrays as arguments for process names?

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