Search Results

Search found 10071 results on 403 pages for 'operator module'.

facebook twitter digg google delicious technorati stumbleupon myspace wordpress linkedin gmail igoogle windows live tumblr viadeo yahoo buzz yahoo mail yahoo bookmarks favorites email print

Page 237/403 | < Previous Page | 233 234 235 236 237 238 239 240 241 242 243 244  | Next Page >

  • SQL vs MySQL: Rules about aggregate operations and GROUP BY

    - by Phazyck
    In this book I'm currently reading while following a course on databases, the following example of an illegal query using an aggregate operator is given: Find the name and age of the oldest sailor. Consider the following attempt to answer this query: SELECT S.name, S.age FROM Sailors.S The intent is for this query to return not only the maximum age but also the name of the sailors having that age. However, this query is illegal in SQL--if the SELECT clause uses an aggregate operation, then it must use only aggregate operations unless the query contains a GROUP BY clause! Some time later while doing an exercise using MySQL, I faced a similar problem, and made a mistake similar to the one mentioned. However, MySQL didn't complain and just spit out some tables which later turned out not be what I needed. Is the query above really illegal in SQL, but legal in MySQL, and if so, why is that? In what situation would one need to make such a query?

    Read the article

  • How does Hibernate detect dirty state of an entity object?

    - by ???'Lenik
    Is it using some kind of byte codes modification to the original classes? Or, maybe Hibernate get the dirty state by compare the given object with previously persisted version? I'm having a problem with hashCode() and equals() methods for complicated objects. I feel it would be very slow to compute hash code if the object has collection members, and cyclic references are also a problem. If Hibernate won't use hashCode()/equals() to check the dirty state, I guess I should not use equals()/hashCode() for the entity object (not value object), but I'm also afraid if the same operator (==) is not enough. So, the questions are: How does Hibernate know if a property of an object is changed? Do you suggest to override the hashCode()/equals() methods for complicated objects? What if they contains cyclic references? And, also, Would hashCode()/equals() with only the id field be enough?

    Read the article

  • Drupal how to set session or cookie?

    - by Gobi
    Hi, i jus friend reference function so i pass the user id through url like below www.example.com?fid=22 i need to set this as a session or cookie which access to all modules in drupal 6. if i set session it return for tht particular module . set cookie is not workin at all. $user-new_property works only on particular page where set if i move to another page no new_property in $user variable object list . Thanxs in advance, Gobi

    Read the article

  • DataSet with many OR clauses

    - by Silvan
    Hello :) I've got a little problem with a query which I create in the Visual Studio Designer. I need a query with a lot of 'OR'-clauses for the same column. I found the operator 'IN', but I don't know how to use that in the Visual Studio Designer: Example IN: SELECT EmployeeID, FirstName, LastName, HireDate, City FROM Employees WHERE City IN ('Seattle', 'Tacoma', 'Redmond') I tried to do it in this way: SELECT [MachineryId], [ConstructionSiteId], [DateTime], [Latitude], [Longitude], [HoursCounter] FROM [PositionData] WHERE [MachineryID] IN @MachineryIDs But this doesn't work. Is there another way to handle a lot of OR clauses? Thank you very much for your help.

    Read the article

  • Is there a full REPL for Erlang?

    - by Gabriel Cuvillier
    Is there a way to have a full interpreter in Erlang, not just a "shell". Since it is a dynamic language, not being able to define named functions in the interpreter is a little bit disappointing... I suspect that it is because compilation units (modules) must be explicitly compiled for their execution by the VM, but maybe a REPL acting as a dynamic/recompilable module exist?

    Read the article

  • Best practice to modularise a large Grails app?

    - by Mulone
    Hi all, A Grails app I'm working on is becoming pretty big, and it would be good to refactor it into several modules, so that we don't have to redeploy the whole thing every time. In your opinion, what is the best practice to split a Grails app in several modules? In particular I'd like to create a package of domain classes + relevant services and use it in the app as a module. Is this possible? Is it possible to do it with plugins? Cheers, Mulone

    Read the article

  • Is it possible to disable Symfony framework support in NetBeans 6.8?

    - by Throlkim
    Put simply: it causes a massive memory leak within an hour if I work on a Symfony project, and I don't use any of the features that it provides. I've looked through all of the menus and can't seem to see an option to disable support for it. Has anyone attempted or managed to remove this module from the IDE? I quite like NetBeans, but on the rare occasions when I need to work with a Symfony project it's causing me quite a headache.

    Read the article

  • Import Excel to sqlserver 2005 using Sqlbulkupload

    - by Jayesh
    Hi all, I want to upload excel file using SqlBulkCopy into sql server 2005 table. My excel file size is 43MB. When i am uploading this file it will display error message that "The request filtering module is configured to deny a request that exceeds the request content length.". My web.config file setting is <httpRuntime executionTimeout="12000" maxRequestLength="2097151" useFullyQualifiedRedirectUrl="false" minFreeThreads="8" minLocalRequestFreeThreads="4" appRequestQueueLimit="100"/> Thanks in advance.

    Read the article

  • How to fix this python program?

    - by Phenom
    import math def p(n): return 393000*((288200/393000)^n * math.exp(-(288200/393000)))/math.factorial(n) print p(3) When I run it, I get the following error message: Traceback (most recent call last): File "poisson.py", line 6, in <module> print p(3) File "poisson.py", line 4, in p return 393000*((288200/393000)^n * math.exp(-(288200/393000)))/math.factoria l(n) TypeError: unsupported operand type(s) for ^: 'int' and 'float'

    Read the article

  • How to rewrite Collection?

    - by latvian
    Hi, I would like to rewrite the collection that is returned by Mage::getResourceModel('sales/order_collection'); My goal is to rewrite this resource so that i can filter out the collection for particular Store. Any ideas on how to do it? I tried directly rewrite collection of the sales/order module but no success. I was able to rewrite sales/order itself but not the collection, because when i call getCollection() it returns "Fatal error: Call to undefined method Mage_Sales_Model_Mysql4_Order::getCollection() " Any idea will help. Thank you, Margots

    Read the article

  • C# Read a String then extract the numbers in that string.

    - by microsumol
    How can we get the numbers 7 and 4 and 5 from the following string: MODULE potmtpMAIN main <info: "Enterprise Optimizer 7.4 for COR Technology 5.5 -- Advanced Solver Edition", url:"http://EO.riverlogic.com", url_menu:"EO Online...", app_id:"EOAS",app_name:"Enterprise Optimizer AS", **app_major:7**, **app_minor:4**,**app_micro:5**,app_copyright:"\251 1996-2010 River Logic Inc.\r\nAll Rights Reserved."> Thank You in advance

    Read the article

  • logging in continouous loop

    - by Mikkel Jans
    What would be a good way to create logs (with python logging module) inside a constant running loop, without producing a large amount of useless log-files? An example would be a loop that constant list a folder, and does some action when it sees a file of a specific type. I want to log that no files were found, or files were found but of a wrong type, without logging that same line constantly for each folder check, as it might run many times a second.

    Read the article

  • Drupal ical for Authenticated users

    - by Linda
    I am using the calender module with it's iCal support for Drupal 6. I have made my event type which appear on the iCal feed. I however want to make the event content type private, so only authenticated users can read it. By doing this they will not show on the iCal feed. Is there any way that I could get the iCal feed to still show these events?

    Read the article

  • How do I redirect a user using Apache Rewrite, to the fully qualified domain name?

    - by Mark
    Hi Guys, I'm really new to apache mod_rewrite module. I have a page called http://abc in my company intranet. I want users to be redirected to http://abc.somecompanyname.com whenever they type http://abc to the URL bar. Could someone please provide and example or point me in the right direction. I figure this should be quite an easy question to answer. Thanks everyone for you inputs. -Mark

    Read the article

  • Installing twisted.mail.smtp

    - by user3506985
    I am using Ubuntu 14.04 and trying to install twisted.mail.smtp using the following commnands -sudo add-apt-repository ppa:jesstess/twisted-12.1-testing -sudo apt-get update There are no errors in the installation,but when I specify the command that is from twisted.mail.smtp import ESMTPSenderFactory I am getting the following error Error: ImportError: No module named mail.smtp Please help me out

    Read the article

  • different explanation

    - by Delirium tremens
    The following code echoes 5, not 10: $global_obj = null; class my_class { var $value; function my_class() { global $global_obj; $global_obj = &$this; } } $a = new my_class; $a->my_value = 5; $global_obj->my_value = 10; echo $a->my_value; "Upon first examination, it would seem that the constructor of my_class stores a reference to itself inside the $global_obj variable. Therefore, one would expect that, when we later change the value of $global_obj-my_value to 10, the corresponding value in $a would change as well. Unfortunately, the new operator does not return a reference, but a copy of the newly created object." Please, give me a different explanation.

    Read the article

  • Cache Web Application files locally (for responsiveness)

    - by jiewmeng
    is there a way i can cache all required application files on the local computer for speed without any disruption (at least those that can be run locally)? i want it to be able to start even without connection right from the start, isit possible? is Google Gears what i shld use? i heard theres a HTML5 feature/module for it?

    Read the article

  • Prolog for beginners about logic and syntax

    - by lnotik
    Hello everybody. I have this question : I need to create a paradict "rightGuesses" which will get 3 arguments , each one of them is a list of letters : 1) The list of guessed letters 2) The word i have to guess 3) The letters that where guessed so far . for example : rightGuesses([n,o,p,q], [p,r,o,l,o,g], Ans). will give us Ans = [p, -, o, -, o, -]. i made: rightGuesses([],T2,[ANS]) rightGuesses([A|T1],T2,[ANS]):- (member(A,T2))=\=true , rightGuesses(T1,T2,[ _ |'-']). rightGuesses([A|T1],T2,[ANS]):- member(A,T2), rightGuesses(T1,T2,[ _ |A]). but i get : ERROR: c:/users/leonid/desktop/file3.pl:5:0: Syntax error: Operator expected Warning: c:/users/leonid/desktop/file3.pl:6: when i trying to compile it what is my problem , and is there is a better way to do it ? thanks in advance.

    Read the article

  • How to call a method withgin a vector?

    - by Mike Dooley
    Hi! How do I call a method of an object which is stored within a vector? The following code fails... ClassA* class_derived_a = new ClassDerivedA; ClassA* class_another_a = new ClassAnotherDerivedA; vector<ClassA*> test_vector; test_vector.push_back(class_derived_a); test_vector.push_back(class_another_a); for (vector<ClassA*>::iterator it = test_vector.begin(); it != test_vector.end(); it++) it->printOutput(); The code retrieves the following error: test3.cpp:47: error: request for member ‘printOutput’ in ‘* it.__gnu_cxx::__normal_iterator<_Iterator, _Container::operator- with _Iterator = ClassA**, _Container = std::vector ’, which is of non-class type ‘ClassA*’ The problem seems to be it->printOutput(); but at the moment I don't know how to call the method properly, does anyone know? regards mikey

    Read the article

  • How to bind a double precision using psycopg2

    - by user337636
    I'm trying to bind a float to a postgresql double precision using psycopg2. ele = 1.0/3.0 dic = {'name': 'test', 'ele': ele} sql = '''insert into waypoints (name, elevation) values (%(name)s, %(ele)s)''' cur = db.cursor() cur.execute(sql, dic) db.commit() sql = """select elevation from waypoints where name = 'test'""" cur.execute(sql_out) ele_out = cur.fetchone()[0] ele_out 0.33333333333300003 ele 0.33333333333333331 Obviously I don't need the precision, but I would like to be able to simply compare the values. I could use the struct module and save it as a string, but thought there should be a better way. Thanks

    Read the article

  • Multiplying complex with constant in C++

    - by Atilla Filiz
    The following code fails to compile #include <iostream> #include <cmath> #include <complex> using namespace std; int main(void) { const double b=3; complex <double> i(0, 1), comp; comp = b*i; comp=3*i; return 0; } with error: no match for ‘operator*’ in ‘3 * i’ What is wrong here, why cannot I multiply with immediate constants?

    Read the article

facebook twitter digg google delicious technorati stumbleupon myspace wordpress linkedin gmail igoogle windows live tumblr viadeo yahoo buzz yahoo mail yahoo bookmarks favorites email print

< Previous Page | 233 234 235 236 237 238 239 240 241 242 243 244  | Next Page >