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• Boost Serialization Library upgrade

  - by Konstantin

  Hello! How do I know that I can safely upgrade Boost Serialization Library on a production system without breaking compatibility with the existing data ? Is there any test that I should perform in order to be sure that all data stored in the binary format by previous version of the library will be successfully read by the new one ? Does Boost Serialization library itself guarantee some sort of compatibility between versions ?

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• What version of mongodb was full $text query operator introduced?

  - by Marc Maxson

  Stupid question, right? But the official docs for 'text index' say: http://docs.mongodb.org/manual/core/index-text/ Text Indexes New in version 2.4. To perform queries that access the text index, use the $text query operator. Whereas if you click on the help for searching the index you created with the $text operator, it reads: http://docs.mongodb.org/manual/reference/operator/query/text/#op._S_text $text New in version 2.6. Seems to be 2.4 but still having problems wiht it.

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• check if a line is valid or not in Java

  - by Adnan

  I would like to perform checking on the following: VALID LINES; /**/ some code */ some code /** dsfsdkf sd**/ NOT VALID LINES; /**/ //some code */ /***/ //somecode So basically if there is a line of code outside a comment it is valid, otherwise not. What would be the best way to tackle this kind of validation? Note: For */ I assume that the /* has been opened some lines before.

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• Is it possible to use SQL XML to insert, and get output from each record?

  - by nbolton

  I would like to perform a SQL XML insert (on MSSQL), and in this case I need to insert a list of files into the DB (this is simple enough). However, there's an auto generated PK column (ID), and I need the ID for each newly created filename without performing a 2nd query. Is this possible? I guess it doesn't matter if the result is/isn't XML, but the input certainly has to be.

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• SQL datetime LIKE select - why do I need an extra %?

  - by tomsullivan1989

  Can someone explain to me why when I perform a LIKE select in SQL (T-SQL) on a varchar column I can do the following: SELECT * FROM Table WHERE Name LIKE 'Th%' to get names beginning with Th, but when I do the same on a datetime column I need a % before the year, like: SELECT * FROM Table WHERE Date LIKE '%2013%' to get dates in 2013. The datetimes are stored in yyyy-MM-dd hh:mm:ss format. I know I could use a DATEPART style query but I was just interested in why I need the extra % here.

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• Prevent <xsi:nil="true"> on Nullable Value Types when Serializing to XML.

  - by Nat Ryall

  I have added some nullable value types to my serializable class. I perform a serialization using XmlSerializer but when the value is set to null, I get an empty node with xsi:nil="true". This is the correct behaviour as I have found here: http://msdn.microsoft.com/en-us/library/ybce7f69%28VS.80%29.aspx Is there a way to switch off this option so that nothing is output when the value type is null?

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• Manipulate data in the DB query or in the code

  - by DrDro

  How do you decide on which side you perform your data manipulation when you can either do it in the code or in the query ? When you need to display a date in a specific format for example. Do you retrieve the desired format directly in the sql query or you retrieve the date then format it through the code ? What helps you to decide : performance, best practice, preference in SQL vs the code language, complexity of the task... ?

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• Detect browser support for cross-domain XMLHttpRequests?

  - by David Wolever

  I'm working on some Javascript that makes use of Firefox 3.5's ability to perform cross-domain XMLHttpRequests… But I'd like to fail gracefully if they aren't supported. Apart from actually making a cross-domain request, is there any way to detect a browser's support for them?

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• Extend Javascript Date Object

  - by jAndy

  Hi Folks, I'm curious what would be the best practice to extend the Date constructor. The problem I'm facing is, that the Internet Explorer (< 7+8) can't parse a date like new Date('2010-05-11'); I have to admit that this is not a standard method to parse, anyways FireFox and Chrome perform well on that kind of date string. Now I'm wondering, should I just split/parse/rebuild the string before calling new Date() or is there a more elegant solution ?

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• Oracle multiset, collection and records

  - by Atul

  Can anybody Explain me why records are required. Can't we perform the same operation in pl/sql using loop and all. Also when multiset, records query can be used i.e. in which type of situation and which one will be the preference.

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• help troubleshooting deadlocks in sql server database

  - by Makach

  I've got two database servers, (1) production (2) test on the production database I get frequent deadlocks and I'm trying to find out what is causing it. I take a backup of the database in production and restore it in test and when I perform the exact same scenario that yields deadlocks on the production server I am unable to reproduce in test. any ideas/tips/hints would be much appreciated.

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• 2d convolution using python and numpy

  - by mikip

  Hi I am trying to perform a 2d convolution in python using numpy I have a 2d array as follows with kernel H_r for the rows and H_c for the columns data = np.zeros((nr, nc), dtype=np.float32) #fill array with some data here then convolve for r in range(nr): data[r,:] = np.convolve(data[r,:], H_r, 'same') for c in range(nc): data[:,c] = np.convolve(data[:,c], H_c, 'same') It does not produce the output that I was expecting, does this code look OK Thanks

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• How to force tracker to re-index a folder?

  - by ubuntudroid

  I'm using the tracker indexing tool to search for and in files on my Ubuntu 10.10 amd64 system. Having recently added some of files into a single folder I wondered how to force tracker to re-index this folder so I would be able to perform search-queries on these files. Any ideas? A terminal command would be completely sufficient.

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• PHP - Where can I find a simple database tool that is easy for non-technical users to use?

  - by John Himmelman

  I'm looking for a simple database admin tool that will allow non-technical users to perform data-entry into a database (imagine a striped down version of phpMyAdmin). It would preferably allow the developer to set restrictions on which tables and fields can be modified.

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• How computer multiplies 2 numbers?

  - by ckv

  How does a computer perform a multiplication on 2 numbers say 100 * 55. My guess was that the computer did repeated addition to achieve multiplication. Of course this could be the case for integer numbers. However for floating point numbers there must be some other logic. Note: This was asked in an interview.

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• Transforming OLTP Relational Database to Data Warehousing Model

  - by Russ Cam

  What are the common design approaches taken in loading data from a typical Entity-Relationship OLTP database model into a Kimball star schema Data Warehouse/Marts model? Do you use a staging area to perform the transformation and then load into the warehouse? How do you link data between the warehouse and the OLTP database? Where/How do you manage the transformation process - in the database as sprocs, dts/ssis packages, or SQL from application code?

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• Can I write a module/filter that gets fired before the web app get's run in Tomcat?

  - by Blankman

  Can I write a module/filter that gets put into the processing pipleline in Tomcat BEFORE the web application even gets run? Something that I could turn on/off for each web application that tomcat is handling. is this possible? So basically it would be a re-usable filter that hooks into the web pipeline that could alter the requests behavior or perform/modify the requests. One example would be to log all ip's, or redirect based on the url, block the request, etc.

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• A single button should be used in all the forms.

  - by mugamath

  i need to use a single button for all forms in a vb.net project. The single button should be called in the forms to perform operations. For eg., In a form i need to save, update the records. When i call the button, save and update buttons should be appeared at runtime using the single button. guide me....

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• Main Memory Database with C++ Interface

  - by myahya

  I am looking for a main memory database with a C++ interface. I am looking for a database with a programmatic query interface and preferably one that works with native C++ types. SQLLite, for example, takes queries as string and needs to perform parsing ... which is time consuming. The operations I am looking for are: Creation of tables of arbitrary dimensions (number of attributes) capable of storing integer types. Support for insertion, deletion, selection, projection and (not a priority) joins.

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• Behavior of virtual function in C++

  - by Summer_More_More_Tea

  Hi everyone: I have a question, here are two class below: class Base{ public: virtual void toString(); // generic implementation } class Derive : public Base{ public: ( virtual ) void toString(); // specific implementation } The question is: If I wanna subclass of class Derive perform polymophism using a pointer of type Base, is keyword virtual in the bracket necessary? If the answer is no, what's the difference between member function toString of class Derive with and without virtual?

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• double border with no space in between

  - by user330239

  Hi guys, i wanted to make a double border but with no space in between and the double border should be of different color. I tried using image instead but i thought css could probably perform this job for me, i searched the net but hardly find anything close. What i wanted is total of 2px dotted border with top color of #a4a4a4 and bottom color of #474747. Any idea how i can do this instead of creating 2 divs?

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• facial comparison software

  - by chris beardmore

  I have images of my children we all do, but I have found a picture of a toddler that bears great resemblance to 1 of my own sons on the internet, is there any software available that I can perform side-by-side comparison with, or maybe software that can give an X-% probability match

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• Analysing objects generated by a Java application in between GCs.

  - by elec

  Is there a tool which could be used to analyse the objects being created between two separate garbage collection run (= number of objects created and their type) ? Heapdumps dont really work here as they perform a GC when they're invoked (or at least that's what I observed everytime so far), and I want to see which objects are collected by the GC, not which objects are left after the GC run, if that makes sense. ...or is it possible somehow to inspect the nature and size of objects being collected by the garbage collector ?

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• User oriented regex library for java

  - by Maxim Veksler

  Hello, I'm looking for a library that could perform "easy" pattern matching, a kind of pattern that can be exposed via GUI to users. It should define a simple matching syntax like * matches any char and alike. In other words, I want to do glob (globbing) like sun's implemented logic http://openjdk.java.net/projects/nio/javadoc/java/nio/file/PathMatcher.html but without relation to the file system. Ideas?

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• How can I execute a non-blocking System.Beep() in C#?

  - by Siracuse

  In C# I can perform a Console.Beep(). However, if you specify a duration of say 1000, or 1 second, it will not execute the next line of code until that second passes. Is there any way possible to execute Console.Beep() in a non-blocking fashion so it will continue to beep and still continue executing the code below it while beeping?

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