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• finding an adjacent node in xml through xpath

  - by kolosy

  i have a deeply nested structure (actually parsing out xhtml, so lots of nasty), like so: <tr> <td> <font id="blah"> stuff </font> </td> </tr> <tr> <td> more stuff </td> </tr> and this repeats in a long table. i need an xpath expression that will select the second font tag (or rather it's text()). i was looking at the preceding-sibling axis, but something isn't quite working right. something along the lines of (and pardon me if this is ridiculous, my xpath is rusty) //tr[preceding-sibling::tr/td/font/b]/td/text()

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• SQL query root parent child records

  - by Vish

  Hi, We have nested folders with parent-child relationship. We use MySQL MyISAM DB. The data is stored in the DB in the following manner. Every time a child folder is created in the nested structure, the previous parentID is added. I want to get the RootFolderID of a folder which is added in the hierarchy as tabulated below. FoldID ParentID |RootFolderID -----------------|------------------- 1 0 | 0 2 1 | 1 3 2 | 1 4 3 | 1 5 4 | 1 Please let me know how to get the root folderID and populate it in the RootFolderID column after a folder is created each time. Thanks.

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• How to import and export only data of whole database in access 2007

  - by DiegoMaK

  Hi, I have two identical databases with same structure, database a in computer a and database b in computer b. The data of database a*(a.accdb)* and database b*(b.accdb)* are different. then in database a i have for example ID:1, 2, 3 and in database B i Have ID:4,5,6 Then i need merge these databases data in only one database(a or b, doesn't matter) so the final database looks like. ID:1,2,3,4,5,6 I search an easy way to do this. because i have many tables. and do this by union query is so tedious. I search for example for a backup option for only data without scheme as in postgreSQl or many others RDBMS, but i don't see this options in access 2007. pd:only just table could be duplicate values(i guess that pk doesn't allow copy a duplicate value and all others values will be copied well). if i wrong please correct me. thanks for your help.

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• How to sort an array or ArrayList<Point> ASC first by x and then by y?

  - by newba

  Hi everyone, I just want to use Collections.sort or Arrays.sort to sort a list of points (class Point) by x first and then by y. I have a class Ponto that implements Comparable like this: public int compareTo(Ponto obj) { Ponto tmp = obj; if (this.x < tmp.x) { return -1; } else if (this.x > tmp.x) { return 1; } return 0; } but now I want to sort by y too after x. How can I do that by modifying the above code? Or is that a better and "clean" way to do this? I also use to pass this code to C++, in which I've created a structure called Point with a equivalent comparable method.

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• How to bind a complex dictionary to a Gridview in asp.net?

  - by Mehdi

  I've used an early binding of a dictionary<string, string> to a gridview to show Urls Text and its HRef as key-value and it works like a charm. But since I want to replace the dictionary with this one : dictionary<string, LinkInfo> the binding goes wrong! Should I handle some events like as onItemDataBound or something? and the LinkInfo structure is: public struct LinkInfo{ public string href; public bool Enabled; }

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• MongoDb - $match filter not working in subdocument

  - by Ranjith

  This is Collection Structure [{ "_id" : "....", "name" : "aaaa", "level_max_leaves" : [ { level : "ObjectIdString 1", max_leaves : 4, } ] }, { "_id" : "....", "name" : "bbbb", "level_max_leaves" : [ { level : "ObjectIdString 2", max_leaves : 2, } ] }] I need to find the subdocument value of level_max_leaves.level filter when its matching with given input value. And this how I tried, For example, var empLevelId = 'ObjectIdString 1' ; MyModel.aggregate( {$unwind: "$level_max_leaves"}, {$match: {"$level_max_leaves.level": empLevelId } }, {$group: { "_id": "$level_max_leaves.level", "total": { "$sum": "$level_max_leaves.max_leaves" }}}, function (err, res) { console.log(res); }); But here the $match filter is not working. I can't find out exact results of ObjectIdString 1 If I filter with name field, its working fine. like this, {$match: {"$name": "aaaa" } }, But in subdocument level its returns 0. {$match: {"$level_max_leaves.level": "ObjectIdString 1"} }, My expected result was, { "_id" : "ObjectIdString 1", "total" : 4, }

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• correct way to store an exception in a variable

  - by Evan Teran

  I have an API which internally has some exceptions for error reporting. The basic structure is that it has a root exception object which inherits from std::exception, then it will throw some subclass of that. Since catching an exception thrown in one library and catching it in another can lead to undefined behavior (at least Qt complains about it and disallows it in many contexts). I would like to wrap the library calls in functions which will return a status code, and if an exception occurred, a copy of the exception object. What is the best way to store an exception (with it's polymorphic behavior) for later use? I believe that the c++0x futures API makes use of something like this. So what is the best approach? The best I can think of is to have a clone() method in each exception class which will return a pointer to an exception of the same type. But that's not very generic and doesn't deal with standard exceptions at all. Any thoughts?

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• Python / Django : emulating a multidimensionnal layer on a mySql database

  - by Sébastien Piquemal

  Hi, I'm working on a Django project where I need to provide a lot of different visualizations on the same data (for example average of a value for each month, for each year / for a location, etc ...). I have been using OLAP database once in college, and I thought that it would fit my needs, but it appears that it is much to heavy for what I need. Actually the volume of data is not very big, so I don't need any optimization, just a way to present different visualizations of the same data without having to write 1000 times the same code. So let's recap : I need a python library : to emulate a multidimensional database (OLAP style would be nice because I think it is quite convenient : stat structure, and everything) non-intrusive, because I can't modify anything on the existing mysql database easy-to-use, because otherwise there's no point in replacing some overhead by another.

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• XML file creation Using XDocument

  - by Pramodh

  i've a list (List< string) "sampleList" which contains Data1 Data2 Data3... How to create an XML file using XDocument by iterating the items in the list in c sharp. The file structure is like <file> <name="samplee"/> <date=" "/> <info> <data value="Data1"/> <data value="Data2"/> <data value="Data3"/> </info> </file please help me to do this

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• View controller/NIB architecture for non-navigation application with transitions?

  - by Ben

  I'm tinkering with an app that doesn't use the UINavigation root view control system, so I don't have natural ownership for each app "view". I essentially have two basic views, a document list view, and a document edit view. I'm playing with UIView animation for getting from a selected document to the edit view. I also have a toolbar that exists in both "views". Because I don't have UINavigation running the show for me, I have a tendency to just throw more and more stuff into one NIB and one view controller that owns the whole container. But now I'm trying to figure out how to segue from the document list view to the edit view if the edit view lives inside a different NIB, preserving the toolbar too. Anyone have thoughts or experience on app structures like this? I find the docs lacking on best practices around code/UI structure for anything except trivial one-screen apps or full-on navigation apps. Thanks!

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• split double in c wihout any libary

  - by DoomStone

  Hello I have a question for a c programmer out there, we have a tast at school to create a soft real time system in an operation system made by our teacher. Well that is all fine and dandy, we have chosen to create a system that calcuate how many unites of medicine a diabetic need based on his or hers blood sugar. It does not need to be correct just that we have the idea of a real time system :D But we have hit a little snag our formula for calculating the units of medicine is [blood sugar] * 1.2 But the only way we can send messages between processes is via a structure that contains 8 longs, but here is where my knowledge of c ends, we need for some way to split this double into 2 longs, example: the whole number in long 0 and the decimals in long 1 and then assemble it on the other side. But I have no idea who to do this, and therefore need a little help. We have tried but we do not have access to c standard libraries

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• Complicated conditional SQL query

  - by DevAno1

  I'm not even sure if it's possible but I need it for my Access database. So I have following db structure : Now I need to perform a query that takes category_id from my product and do the magic : - let's say product belongs to console (category_id is in table Console) - from console_types take type_id, where category_id == category_id - but if product belongs to console_game (category_id is in table console_game) - from console_game take game_cat_id, where category_id == category_id I'm not sure if mysql is capable of such thing. If not I'm really f&%ranked up. Maybe there is a way to split this into 2,3 separate queries ?

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• UINavigationController crashes after pushing 3 views onto stack

  - by joec

  I have a navigation controller, which has the following structure: Category Item Item Detail I can choose a category, and then choose an item to see its details. I can do this twice, i.e. go Back to the list of items and select another item. If i try this a third time, the app crashes, I get objc_msgSend in stack but thats all. But, instead of choosing another item, i go to the list of categories, and choose a different category, I can select two items in that category, before it crashes also. What would be causing this? Thanks

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• PHP - Concatenating objects and casting to string - bad idea?

  - by franko75

  Is it bad practice to concatenate objects when used in this context: $this->template->head .= new View('custom_javascript') This is the way i normally add extra css/js stuff to specific pages. I use an MVC structure where my basic html template has a $head variable which I set in my main Website_controller. I have used this approach for a while as it means I can just add bits and pieces of css/js stuff from whichever page/controller needs it. But having come across a problem in PHP 5.1.6 where the above code results in "Object ID #24", the result of toString() not being called i think, I am rethinking whether i should just fix this to work in PHP 5.1.6 or if i should rethink this approach in general. Any pointers appreciated!

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• jQuery.param() - doesn't serialize javascript Date objects?

  - by ehahn9

  jQuery.param({foo: 1}); // => "foo=1" - SUCCESS! jQuery.param({bar: new Date()}); // => "" - OUCH! There is no problem with encodeURIComponent(new Date()), which is what I would have thought param is calling for each member. Also, explicitly using "traditional" param (e.g. jQuery.param(xxx, true)) DOES serialize the date, but alas, that isn't of much help since my data structure isn't flat. Is this because typeof(Date) == "object" and param tries to descend into it to find scalar values? How might one realistically serialize an object that happens to have Date's in it for $.post() etc.?

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• What's the performance penalty of weak_ptr?

  - by Kornel Kisielewicz

  I'm currently designing a object structure for a game, and the most natural organization in my case became a tree. Being a great fan of smart pointers I use shared_ptr's exclusively. However, in this case, the children in the tree will need access to it's parent (example -- beings on map need to be able to access map data -- ergo the data of their parents. The direction of owning is of course that a map owns it's beings, so holds shared pointers to them. To access the map data from within a being we however need a pointer to the parent -- the smart pointer way is to use a reference, ergo a weak_ptr. However, I once read that locking a weak_ptr is a expensive operation -- maybe that's not true anymore -- but considering that the weak_ptr will be locked very often, I'm concerned that this design is doomed with poor performance. Hence the question: What is the performance penalty of locking a weak_ptr? How significant is it?

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• M2Crypto: Is PKey a reference to a Public or a Private key?

  - by Andrea Zilio

  In the PKey class documentation of the M2Crypto python package (an OpenSSL wrapper for Python) it is said that PKey is a reference to a Public key. My opinion is instead that it's a reference to a Private Key because the init method of the PKey class calls the evp_pkey_new openssl function that, from this link: http://linux.die.net/man/3/evp_pkey_new , should allocate a new reference to a private key structure! There are two only possible explaination: The M2Crypto documentation is wrong or the link I've reported has wrong informations. Can someone help me to find the truth?

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• How can I generate a unique ID using a hash in Perl?

  - by sganesh

  I doing message transfer program between multiple clients and server. I want to generate unique message id for every messages. that should be generated by server and return to client. For message transfer I am using hash data structure, Ex: { api => POST, username => sganesh, pass => "pass", message => "hai", time => "current_time", } I want to generate unique id using this hash. I have tried some of the ways, MD5 and freeze but this give unreadable id. I want some meaningful or readable unique id. I have thought we can use micro seconds to differentiate the id but here the problem is multiple clients. In any situation my id should be unique. Can anyone help me out of this problem? Thanks in Advance.

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• advance click counter mysql or flat file

  - by jay

  Hi, First of all Thank You for looking. whats the best method for make an advance click counter (eg. order by views [today] | [yesterday] [this week] [last week] [this month] [last month] [all time] ). Is it better to use a flat file or mysql?. This is the MYSQL Structure i came up with. id (type: int(11)) link_id (type: int(11)) date (type: date) counter (type: int(11)) please can you advice me on whats the most effective way of doing this.

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• xpath for xquery in SQL

  - by Haroldis

  Hi all, I have a xml filed in sql table the xml have the structure like these <root> <element> <sub name="1"> <date>the date <date> </sub> <sub name="2"> <date>the date <date> </sub> <sub name="3"> <date>the date <date> </sub> ..... <element> </root> how i can get the date of the element with the name 1? I have prove : /root/element/sub[Name = "1"]/date/text() but nothing hapen. any ideas?

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• Bound a treeview control to user-defined complex type using EF 4

  - by GIbboK

  Hi, I use Asp.net, SQL 2008 and EF 4. I need display hierarchy data in a treeview control, Data is stored in a DB that use HierarchyId. Unfortunately, EF4 doesn't support HierarchyId. So in this case, I thought to have a stored procedure that deals with my hierarchy and return a result set back to EF that EF4 can turn into a collection of user-defined complex type that can then be bound directly to the treeview control. I imported a SPROC in EF 4 using Import Function and now I have a Complex DataType called: CategoryHierarchy_Result An image of my Model: Here some data from the Complex Type (in a GridView for example GridView1.DataSource = context.CategoryHierarchy(1);): My questions is: How to display my data from my Complex Type in a TreeView Control, showing a Tree structure that respect CategoryNodeString? I am a beginner an I never use TreeView before, any help or resource would be appreciated! Thanks!. Here some useful resource: http://www.robbagby.com/entity-framework/entity-framework-modeling-action-stored-procedures/

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• Linq to SQL Azure generating Error "Specified cast is not valid."

  - by Rabbi

  B"H I have an application that has been working for months using Linq to SQL connecting to a SQLExpress. I tried migrating it to SQL Azure. I copied the structure and data using the Sync Framework. I viewed the data in SQL Azure using SSMS 2008 R2 and it seams to be exactly what I have in my Sql Server. However when I try to use Linq to SQL against it I get an error "Specified cast is not valid." I seams to be happening any time I get child records. i.e. whenever I fill (the first time I access) an entity set. It seams to be happening after the data returns and when Linq tries to put it into the objects. Remember, the application is working perfectly against sqlexpress, even when accessed across the internet or vpn.

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• Order database results by bayesian rating

  - by One Trick Pony

  I'm not sure this is even possible, but I need a confirmation before doing it the "ugly" way :) So, the "results" are posts inside a database which are stored like this: the posts table, which contains all the important stuff, like the ID, the title, the content the post meta table, which contains additional post data, like the rating (this_rating) and the number of votes (this_num_votes). This data is stored in pairs, the table has 3 columns: post ID / key / value. It's basically the WordPress table structure. What I want is to pull out the highest rated posts, sorted based on this formula: br = ( (avg_num_votes * avg_rating) + (this_num_votes * this_rating) ) / (avg_num_votes + this_num_votes) which I stole form here. avg_num_votes and avg_rating are known variables (they get updated on each vote), so they don't need to be calculated. Can this be done with a mysql query? Or do I need to get all the posts and do the sorting with PHP?

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• Use of type 'id' in cocoa class

  - by gotye

  Hey guys, I want to implement a class which can be used by two classes of my project. One is manipulating 'NewsRecord' objects. One is manipulating 'GalleriesRecord' objects. In another class, I may use one of the two objects so i do something like that : // header class id myNewsRecordOrGalleriesRecord; // class.m // NewsRecord and GalleriesRecord have both the title property NSLog(myNewsRecordOrGalleriesRecord.title); and i get : error : request for member 'title' in something not a structure or union any ideas :D ? Thanks. Gotye How am I supposed to do it ?

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• How can I change the filename of a shared library after building a program that depends on it?

  - by ZorbaTHut

  I have a program that depends on a shared library it expects to find deep inside a directory structure. I'd like to move that shared library out and into a better place. On OS X, this can be done with install_name_tool. I'm unable to find an equivalent for Linux. For reference, readelf -d myprogram spits out the following paraphrased output: Dynamic section at offset 0x1e9ed4 contains 30 entries: Tag Type Name/Value 0x00000001 (NEEDED) Shared library: [this/is/terrible/library.so] 0x00000001 (NEEDED) Shared library: [libGL.so.1] 0x00000001 (NEEDED) Shared library: [libGLU.so.1] 0x00000001 (NEEDED) Shared library: [libstdc++.so.6] and I would like to errata "this/is/terrible/library.so" to be "shared/library.so". I know about RPATH and it isn't what I'm looking for, I don't need to change search paths globally.

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