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• help me with the following sql query

  - by rupeshmalviya

  could somebody correct my following query, i am novice to software development realm, i am to a string builder object in comma separated form to my query but it's not producing desired result qyery is as follows and string cmd = "SELECT * FROM [placed_student] WHERE passout_year=@passout AND company_id=@companyId AND course_id=@courseId AND branch_id IN('" + sb + "')"; StringBuilder sb = new StringBuilder(); foreach (ListItem li in branch.Items) { if (li.Selected == true) { sb.Append(Convert.ToInt32(li.Value) +", "); } } li is integer value of my check box list which are getting generated may be differne at different time ...please also suggest me some good source to learn sql..

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• Passing derived objects in a constructure

  - by Clarence Klopfstein

  This is a bit of a convoluted question, hopefully I can make it clear. I am finding that this may not be possible, but am trying to see if anybody has a solution. I have four classes, two are core classes and two are those core classes extended: extUser Extends coreUser extSecurity Extends coreSecurity In the constructor for coreUser you have this: public coreUser(string id, ref coreSecurity cs) When trying to extend coreUser you would have this: public extUser(string id ref extSecurity es) : base(id, ref es) This fails because es is of type, extSecurity and the base class expects a type of coreSecurity. I've not found anyway to cast this to allow for me to override this base class in C#. In VB it works just fine. Ideas?

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• Constant embedded for loop condition optimization in C++ with gcc

  - by solinent

  Will a compiler optimize tihs: bool someCondition = someVeryTimeConsumingTask(/* ... */); for (int i=0; i<HUGE_INNER_LOOP; ++i) { if (someCondition) doCondition(i); else bacon(i); } into: bool someCondition = someVeryTimeConsumingTask(/* ... */); if (someCondition) for (int i=0; i<HUGE_INNER_LOOP; ++i) doCondition(i); else for (int i=0; i<HUGE_INNER_LOOP; ++i) bacon(i); someCondition is trivially constant within the for loop. This may seem obvious and that I should do this myself, but if you have more than one condition then you are dealing with permuatations of for loops, so the code would get quite a bit longer. I am deciding on whether to do it (I am already optimizing) or whether it will be a waste of my time.

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• Best way to support large dropdowns

  - by JustAProgrammer

  Say I have a report that can be restricted by specifying some value in a dropdown. This dropdown list references a table with 30,000 records. I don't think this would be feasible to populate a dropdown with! So, what is the best way to provide the user the ability to select a value given this situation? These values do not really have categories and even if I subdivided (by having some nesting dropdown situation) by the first letter of the value, that may still leave a few thousand entries. What's the best way to deal with this?

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• How much RAM used by Python dict or list?

  - by Who8MyLunch

  My problem: I am writing a simple Python tool to help me visualize my data as a function of many parameters. Each change in parameters involves a non-trivial amount of time, so I would like to cache each step's resulting imagery and supporting data in a dictionary. But then I worry that this dictionary could grow too large over time. Most of my data is in the form of Numpy arrays. My question: How would one go about computing the total number of bytes used by a Python dictionary. The dictionary itself may contain lists and other dictionaries, each of which contain data stored in Numpy arrays. Ideas?

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• How to access constant defined in child class?

  - by kavoir.com

  I saw this example from php.net: <?php class MyClass { const MY_CONST = "yonder"; public function __construct() { $c = get_class( $this ); echo $c::MY_CONST; } } class ChildClass extends MyClass { const MY_CONST = "bar"; } $x = new ChildClass(); // prints 'bar' $y = new MyClass(); // prints 'yonder' ?> But $c::MY_CONST is only recognized in version 5.3.0 or later. The class I'm writing may be distributed a lot. Basically, I have defined a constant in ChildClass and one of the functions in MyClass (father class) needs to use the constant. Any idea?

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• Display continious dates in Pivot Chart

  - by Douglas

  I have a set of data in a pivot table with date times and events. I've made a pivot chart with this data, and grouped the data by day and year, then display a count of events for each day. So, my horizontal axis goes from 19 March 2007 to 11 May 2010, and my vertical axis is numeric, going from zero to 140. For some days, I have zero events. These days don't seem to be shown on the horizontal axis, so 2008 is narrower than 2009. How do I display a count of zero for days with no events? I'd like my horizontal axis to be continuous, so that it does not miss any days, and every month ends up taking up the same amount of horizontal space. (This question is similar to the unanswered question here, but I'd rather not generate a table of all the days in the last x number of years just to get a smooth plot!)

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• git - how do I clone into a non-empty directory?

  - by shovas

  I have directory A with files matching directory B. Directory A may have other needed files. Directory B is a git repo. I want to clone directory B to directory A but git-clone won't allow me to since the directory is non-empty. I was hoping it would just clone .git and since all the files match I could go from there? I can't clone into an empty directory because I have files in directory A that are not in directory B and I want to keep them. Copying .git is not an option since I want refs to push/pull with and I don't want to set them up manually. Is there any way to do this? Update: I think this works, can anyone see any problems? -- cd a git clone --no-hardlinks --no-checkout ../b a.tmp mv a.tmp/.git . rm -rf a.tmp git unstage # apparently git thinks all the files are deleted if you don't do this

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• Is there an alternative of using a VBScript for enabling FileStream after SQL Server installation?

  - by user193655

  To use Filestream on a DB 3 steps must be done: 1) enable it a server/instance level 2) enable it (sp_configure) at DB level 3) create a varbinary(max) field that supports filestream (2) and (3) are done easily with T-SQL (1) is doable manually from SQL Server Configuration Manager, basically what I need is to check all the 3 checkboxes: but how is it possible to automize it? I found this artcile "Enabling filestream usin a VBScript", is there another way to do it than using VBScripts? May be something that is possible to do only with 2008R2? In case it VBScript is the only solution, which are the possible downsides?

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• Several modules in a package importing one common module

  - by morpheous

  I am writing a python package. I am using the concept of plugins - where each plugin is a specialization of a Worker class. Each plugin is written as a module (script?) and spawned in a separate process. Because of the base commonality between the plugins (e.g. all extend a base class 'Worker'), The plugin module generally looks like this: import commonfuncs def do_work(data): # do customised work for the plugin print 'child1 does work with %s' % data In C/C++, we have include guards, which prevent a header from being included more than once. Do I need something like that in Python, and if yes, how may I make sure that commonfuncs is not 'included' more than once?

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• Rails 2.3.8 Compound condition

  - by Michael Guantonio

  I have a rails query that I would like to run. The only problem that I am having is the query structure. Essentially the query looks like this queryList = model.find(:all, :conditions => [id = "id"]) #returns a query list #here is the issue compound = otherModel.find(:first, :select => "an_id", :conditions => ["some_other_id=? and an_id=?, some_other_id, an_id]) Where an_id is actually a list of ids in the query list. How can I write that in rails to basically associate a single id to a list that may contain ids...

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• How to make the first invocation of a macro different from all the next ones ?

  - by LB

  Hi, that may be really simple but i'm unable to find a good answer. How can I make a macro representing first a certain value and then a different one ? I know that's nasty but i need it to implicitly declare a variable the first time and then do nothing. This variable is required by other macros that i'm implementing. Should i leverage "argument prescan" ? thanks for the answers. EDIT To make things clearer. Suppose i have a macro FOO, and I do something like FOO FOO FOO I would like the result to be foo bar bar I don't want the actual code to be cluttered by ifndef. The programmer should only have to write macro invocations.

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• Assign parameters to function according to parameter names

  - by Korcholis

  I have an assoc array with a list of what are parameters to me. Here's an example: array( 'param1' => 'value1', 'param4' => 'value4', 'param3' => 'value3', 'param2' => 'value2', ); Note that they may come unsorted. Now, is there a way I can make a call (static or from an instance, using call_user_func_array or similar) and correctly pass each value to each parameter? Just to be sure, an example function I'd like to call using that parameter array is one such this: exampleFunction($param1, $param2, $param3, $param4) { ... } PS: Reflection is great, but I'm concerned about execution times (which, at least, in Java tends to increase a lot when using Reflection). If you know any other way to do so, it would be awesome.

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• Simple php if query to double check

  - by skarama

  Is anything wrong with this code? <?php $variable = ; if (isset($variable)) { echo $variable ; echo "also this" ; } else echo "The variable is not set" ; ?> also, the other potential value of the variable is : $variable = <a href="http://www.mysite.com/article">This Article</a>; To clarify, I have a variable that may hold one of two possible values : an a href tag with it's url, or notihng at all. I need to have two different printouts for each of these cases, maybe I'm not doing it the right way though!

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• Feedback on availability with Google App Engine

  - by Ron

  We've had some good experiences building an app on Google App Engine, this first app's target audience are Google Apps users, so no issues there in terms of it being hosted on Google infrastructure. We like it so much that we would like to investigate using it for a another app, however this next project is for a client who is not really that interested in what technology it sits on, they just want it to work, and work all of the time. In this scenario, given that we have the technology applicability and capability side covered, are there any concerns that this stuff is still relatively new and that we may not be as much "in control" as if we had it done with traditional hosting?

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• How to get variable value from inside a stored procedure in DB2?

  - by Sylvia

  This seems like it should be very easy...anyway, it is in MS SQL Server In a DB2 stored procedure, how can I just get the value of a variable? Say I have the following stored procedure: CREATE PROCEDURE etl.TestABC( ) LANGUAGE SQL BEGIN declare Stmt varchar(2048); set Stmt = 'this is a test'; -- print Stmt; -- select Stmt; return 0; END @ I'd like to print out the value of Stmt after I set it. Print doesn't work, select doesn't work. Somebody said I have to insert it to a table first, and then get it after I run the stored procedure. Is this really necessary? Thanks, Sylvia EDIT: I should have made clearer that I want to see the value of Stmt each time after I set it, and I may need to set it multiple times within the same stored procedure.

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• How to limit a request execution time of WCF service?

  - by Kamarey

  Is there something in WCF configuration that defines a timeout for executing a request at service side? E.g. WCF service will stop executing request after some time period. I have a service which make some work depending on client input. In some cases a such call may take too much time. I want to limit the execution time of such requests on service side, not client one using SendTimeout. I know about OperationTimeout property, but it doesn't abort the service request, it just tells a client that the request is timed out.

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• how to select distinct rows for a column

  - by Satoru.Logic

  Hi, all. I have a table x that's like the one bellow: id | name | observed_value | 1 | a | 100 | 2 | b | 200 | 3 | b | 300 | 4 | a | 150 | 5 | c | 300 | I want to make a query so that in the result set I have exactly one record for one name: (1, a, 100) (2, b, 200) (5, c, 300) If there are multiple records corresponding to a name, say 'a' in the table above, I just pick up one of them. In my current implementation, I make a query like this: select x.* from x , (select distinct name, min(observed_value) as minimum_val from x group by name) x1 where x.name = x1.name and x.observed_value = x1.observed_value; But I think there may be some better way around, please tell me if you know, thanks in advance.

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• Prevent .htaccess syntax error

  - by seengee

  Hi, As part of one our system's we enable a user in the backoffice to add a block of 301 redirects should they need to. This is just a textarea which then populates a specific area of a .htaccess file. As much as this may seem insecure it has only previously used internally by people who know what they are doing but for various reasons they cannot access the specific file. We need now to allow more access to this function, not for the general public, but for people that probably have far less knowledge of regexp etc and syntax in htaccess files. Obviously the major concern here is the user enters some bad syntax and makes their entire site, including the backoffice where they could fix the issue, totally inaccessible without manual intervention. What approaches can i take to make sure that they do not break their site? A htaccess syntax check? copy the file elsewhere and check it doesnt generate a 500 error (with cURL or similar)?. Would welcome any ideas. Thanks.

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• How to persist a cookie?

  - by user246114

  Hi, I am creating a cookie in a jsp script, which is located at: www.myproject.com/login/index.jsp if I restart the browser and navigate there, all works well, I can see the cookie persist. If I navigate to: www.myproject.com I am not seeing the cookie. Do I need to set something in the cookie path or domain to make the cookie visible to the entire [myproject.com] domain (I just want to access the cookie from whatever sub path the user may be on). I am creating the cookie like: Cookie c = new Cookie("thisisatest", "foo"); c.setMaxAge(60 * 24 * 3600); response.addCookie(c); Thanks

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• PHP: report table with date gaps

  - by Daniel

  Hi. I have a table in DB which contains summaries for days. Some days may not have the values. I need to display table with results where each column is a day from user selected range. I've tried to play with timestamp (end_date - start_date / 86400 - how many days in report, then use DATEDIFF(row_date, 'user_entered_start_date') and create array from this indexes), but now I've got whole bunch of workarounds for summer time :( Any examples or ideas how to make this correct? P.S. I need to do this on PHP side, because DB is highly loaded.

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• how to find out if a shape is passable

  - by jd

  I have a complex polygon (possibly concave) and a few of its edges marked as entry/exit points. there is a possibility that inside this polygon may lie one or more blockades of arbitrary shape. what approaches could I use to determine whether a path of certain width exists between a pair of entry/exit edges? having read through the question it looks like a homework type - it is not. I just wish to have a at least a few leads I could pursue, as this is new to me.

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• Object for storing strings in Python

  - by evg

  class MyWriter: def __init__(self, stdout): self.stdout = stdout self.dumps = [] def write(self, text): self.stdout.write(smart_unicode(text).encode('cp1251')) self.dumps.append(text) def close(self): self.stdout.close() writer = MyWriter(sys.stdout) save = sys.stdout sys.stdout = writer I use self.dumps list to store data obtained from prints. Is there a more convenient object for storing string lines in memory? Ideally I want dump it to one big string. I can get it like this "\n".join(self.dumps) from code above. May be it's better to just concatenate strings - self.dumps += text?

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• In R draw two lines, with slopes double and half the value of the best fit line

  - by D W

  I have data with a best fit line draw. I need to draw two other lines. One needs to have double the slope and the other need to have half the slope. Later I will use the region to differentially color points outside it as per: http://stackoverflow.com/questions/2687212/conditionally-colour-data-points-outside-of-confidence-bands-in-r Example dataset: ## Dataset from http://www.apsnet.org/education/advancedplantpath/topics/RModules/doc1/04_Linear_regression.html ## Disease severity as a function of temperature # Response variable, disease severity diseasesev<-c(1.9,3.1,3.3,4.8,5.3,6.1,6.4,7.6,9.8,12.4) # Predictor variable, (Centigrade) temperature<-c(2,1,5,5,20,20,23,10,30,25) ## For convenience, the data may be formatted into a dataframe severity <- as.data.frame(cbind(diseasesev,temperature)) ## Fit a linear model for the data and summarize the output from function lm() severity.lm <- lm(diseasesev~temperature,data=severity) # Take a look at the data plot( diseasesev~temperature, data=severity, xlab="Temperature", ylab="% Disease Severity", pch=16, pty="s", xlim=c(0,30), ylim=c(0,30) ) title(main="Graph of % Disease Severity vs Temperature") par(new=TRUE) # don't start a new plot abline(severity.lm, col="blue")

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• ctype_alpha but allow spaces(php)

  - by helloo

  I was wondering if one can allow spaces in a textfield when checking it with ctype_alpha. Since ctype_alpha only allows alphabetical letters, I don't know how to let the user enter space in the field. I did try using ctype_space but that didn't work. I simply want the user to be able to type only alphabets and they have a choice to include spaces if they "wish." I hope I will not have to use regexp as I am very new to all of this and hope to learn it at a later date. Below is some of the code...Thank you. elseif (!ctype_alpha($fname)) { echo "Your name may only contain alphabetical letters"; }

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