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  • Hibernate: how to maintain insertion order

    - by jwaddell
    I have a list of entities where creation order is important, but they do not contain a timestamp to use for sorting. Entities are added to the end of the list as they are created so they will be ordered correctly in the list itself. After persisting the list using Hibernate the entities appear in the database table in the order that they were created. However when retrieving the list using a new Hibernate session the list is now in reverse order of insertion/creation. Is this expected behaviour? Is there any way to retrieve the list in the same order as it appears in the table? The primary key is a UUID, and the list of entities should always have been created on the same IP address and JVM. This mean sorting by UUID is a possibility but I'd rather not make assumptions. Another possibility is if the list is guaranteed to always come out in reverse order I could always just work through it backwards.

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  • Find common nodes from two linked lists using recursion

    - by Dan
    I have to write a method that returns a linked list with all the nodes that are common to two linked lists using recursion, without loops. For example, first list is 2 - 5 - 7 - 10 second list is 2 - 4 - 8 - 10 the list that would be returned is 2 - 10 I am getting nowhere with this.. What I have been think of was to check each value of the first list with each value of the second list recursively but the second list would then be cut by one node everytime and I cannot compare the next value in the first list with the the second list. I hope this makes sense... Can anyone help?

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  • How do I get a list of all languages that my Windows Forms application has been localized to?

    - by Andrei B
    I have localized localized a Form into two language by setting the Localizable property to True and setting the Language from (Default) to (Dutch(Netherlands)), and I changed the control texts. Visual Studio generated the resource files and compiles them into the application. I need to get a simple list of all the languages that my form has been localized into. Currently it would be just two English and Dutch, but more may come. I need to programatically get a list of "what languages my application is localized into". Do I look into the resource files or use ResourceManager or what? Thanks!

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  • Recommendations for C# controls that can be used to create a hierarchical list of prioritised items?

    - by Mendokusai
    I need to be able to display and edit a hierarchical list of tasks in a C# app. It can either be a Windows form app, or ASP.NET. Basically, I want similar behaviour to the way Microsoft Project handles tasks. The control would need to: 1) Maintain a list of items made up of several fields 2) Each item can have a number of children (at least 3 levels of nesting) 3) It needs to be very easy to change the parents/children of an item 4) It needs to be very easy to edit the fields (as fast as changing cells in Excel) 5) It needs to be very easy to reorder the items by dragging and dropping or cut and paste 6) If I can easily connect the control to a database, even better Anyone got any recommendations for controls for me to look at?

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  • How to update a sharepoint list item via web services using a where clause?

    - by JL
    I would like to update a list item using SharePoint and am stuggling to find 1 decent CAML example. Here is what I want to do, in SQL my query would look something like this update [table] set field='value' where fieldID = id; so this would mean I have 1 item in a list I would like to update 1 field on given the ID of that listitem. I've tried this, but it doesn't work: batchElement.InnerXml = "<Method ID='1' Cmd='Update'>" + "<Field Name='DeliveryStatus'>" + newStatus.ToString() + "</Field>" + "<Where><Eq><FieldRef Name='ID' /><Value Type='Text'>" + id + "</Value></Eq></Where></Method>";

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  • Can anyone help with java? Finding common nodes from two linked lists using recursion

    - by Dan
    I have to write a method that returns a linked list with all the nodes that are common to two linked lists using recursion, without loops. For example, first list is 2 - 5 - 7 - 10 second list is 2 - 4 - 8 - 10 the list that would be returned is 2 - 10 I am getting nowhere with this.. What I have been think of was to check each value of the first list with each value of the second list recursively but the second list would then be cut by one node everytime and I cannot compare the next value in the first list with the the second list. I hope this makes sense... Can anyone help?

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  • How do I translate a List<string> into a SqlParameter for a Sql In statement?

    - by KallDrexx
    I seem to be confused on how to perform an In statement with a SqlParameter. So far I have the following code: cmd.CommandText = "Select dscr from system_settings where setting in @settings"; cmd.Connection = conn; cmd.Parameters.Add(new SqlParameter("@settings", settingList)); reader = cmd.ExecuteReader(); settingsList is a List<string>. When cmd.ExecuteReader() is called, I get an ArgumentException due to not being able to map a List<string> to "a known provider type". How do I (safely) perform an In query with SqlCommands?

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  • [FreeBSD kernel ]How to maintain a linked list on kernel lever?

    - by Andy Leman
    The situation is: I will implement sets of new system calls. Each of them need to access (read or write) a linked list. So, that means I will have several C programs. So, how can I maintain a linked list in memory and let several programs access it? Or,this is wrong....I should save it as a file? (but I hardly think this is a good idea).. A lot of confused questions here...Need help. Thank you indeed!

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  • How can I reshape and aggregate list of tuples in Python?

    - by radek
    I'm a newb to Python so apologies in advance if my question looks trivial. From a psycopg2 query i have a result in the form of a list of tuples looking like: [(1, 0), (1, 0), (1, 1), (2, 1), (2, 2), (2, 2), (2, 2)] Each tuple represents id of a location where event happened and hour of the day when event took place. I'd like to reshape and aggregate this list with subtotals for each hour in each location, to a form where it looks like: [(1, 0, 2), (1, 1, 1), (1, 2, 0), (2, 0, 0), (2, 1, 1), (2, 3, 3)] Where each touple will now tell me that, for example: in location 1, at hour 0 there were 2 events; in location 1, at hour 1 there was 1 event; and so on... If there were 0 events at certain hour, I still would like to see it, as for example 0 events at 0 hours in location 2: (2, 0, 0) How could I implement it in Python?

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  • What is the use of Method Overloading in Java when it is achieved by changing the sequence of parameters in the argument list?

    - by MediumOne
    I was reading a Java training manual and it said that Method Overloading in Java can be achieved by having a different argument list. It also said that the argument list could differ in (i). Number of parameters (ii). Datatype of parameters (iii). Sequence of parameters My concern is about (iii). What is the use of trying to overload a method just by changing the sequence of parameters? I am unable to think of any benefits by this way.

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  • JPQL: What kind of objects contains a result list when querying multiple columns?

    - by Bunkerbewohner
    Hello! I'm trying to do something which is easy as pie in PHP & Co: SELECT COUNT(x) as numItems, AVG(y) as average, ... FROM Z In PHP I would get a simple array like [{ numItems: 0, average: 0 }] which I could use like this: echo "Number of Items: " . $result[0]['numItems']; Usually in JPQL you only query single objects or single columns and get Lists types, for example List or List. But what do you get, when querying multiple columns?

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  • idiomatic way to take groups of n items from a list in Python?

    - by Wang
    Given a list A = [1 2 3 4 5 6] Is there any idiomatic (Pythonic) way to iterate over it as though it were B = [(1, 2) (3, 4) (5, 6)] other than indexing? That feels like a holdover from C: for a1,a2 in [ (A[i], A[i+1]) for i in range(0, len(A), 2) ]: I can't help but feel there should be some clever hack using itertools or slicing or something. (Of course, two at a time is just an example; I'd like a solution that works for any n.) Edit: related http://stackoverflow.com/questions/1162592/iterate-over-a-string-2-or-n-characters-at-a-time-in-python but even the cleanest solution (accepted, using zip) doesn't generalize well to higher n without a list comprehension and *-notation.

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  • Prolog .. Can i convert from a list of chars to a string or term in Prolog !!

    - by AhmadAssaf
    i use read_line_to_codes(Stream,Line) to read a line from a file .. first is there any way to read a line and assign it to a term in prolog ?? if not i managed to read a line and put it in this char list .. now this char list contains spaces .. which is bad .. so i want to convert it to a term or a string in prolog so that i can process it easier .. spaces cannot be atoms so thats a problem .. i appreciate the help !!

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  • How do I splice into a list outside of a macro in Common Lisp?

    - by derefed
    Say I have a function foo: (defun foo (x y &rest args) ...) And I later want to wrap it with a function bar: (defun bar (x &rest args) (foo x 100 args)) Assume bar was then called like this: (bar 50 1 2 3) With this setup, args is a list within the body of bar that holds the trailing parameters, so when I pass it to foo, instead of getting the equivalent of (foo 50 100 1 2 3) I of course get (foo 50 100 '(1 2 3)). If these were macros, I would use `(foo ,x 100 ,@args) within the body of bar to splice args into the function call. ,@ only works inside a backtick-quoted list, however. How can I do this same sort of splicing within a regular function?

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  • What is the most efficient way to list all of the files in a directory (including sub-directories)?

    - by prometheus
    I am writing a servlet which will examine a directory on the server (external to the web container), and recursively search for certain files (by certain files, I mean files that are of a certain extension as well as a certain naming convention). Once these files are found, the servlet responds with a long list of all of the found files (including the full path to the files). My problem is that there are so many files and directories that my servlet goes extremely slow. I was wondering if there was a best practice or existing servlet for this type of problem? Would it be more efficient to simply compile the entire list of files and do the filtering via js/jquery on the client side?

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  • Associate List<T>.Remove to an event in C#?

    - by Uri
    Hi guys, I have a Products:List<Product> class. I'd like to make it so that every time that I remove an item from that list, my program decreases a counter. Is there a way to do it without overriding the Remove method or decreasing it manually? And if there is none, anybody knows where I can find the code for the Remove method? Thanks! I thought about associating the Remove method to an event, but I don't know how to do it without overriding it or creating another method with the Remove method inside it. Excuse me for my ignorance, but I'm just getting into OOP programming.

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  • How can i convert between F# List and F# Tuple?

    - by ksharp
    Is there some way to convert between F# List and F# Tuple? For example: [1;2;3] -> (1,2,3) (1,2,3,4) -> [1;2;3;4] I need two Functions to do that: let listToTuple list = ... let tupleToList tuple = ... Thank you in advance. I think reflection is necessary to this problem. I know the performance is not good. I have to pay the cost of breaking functional programming rule.

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  • how to go the middle of the singularly linked list in one iteration?

    - by u3050
    Recently I have been asked one question that in a singularly linked list how do we go to the middle of the list in one iteration. A --> B --> C --> D (even nodes) for this it should return address which points to B A --> B --> C (odd nodes) for this also it should return address which points to B There is one solution of taking two pointers one moves one time and other moves two times but it does not seem working here LinkedList p1,p2; while(p2.next != null) { p1 = p1.next; p2 = p2.next.next; } System.out.print("middle of the node" + p1.data); //This does not give accurate result in odd and even Please help if anyone has did this before.

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