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• SQLITE (C/C++interface) - How to commit a transaction

  - by AJ

  I am using sqlite c/c++ interface. Now here is my scenario - I have 3 tables (related tables) say A, B, C. Now, there is a function called Set, which get some inputs and based on the inputs inserts rows into these three tables. (sometimes it can be an update in one of the tables) Now I need two things. One, i dont want autocommit feature. Basically I would like to commit after every 1000 calls to Set function Secondly, within the set function itself, if i find that after inserting into two tables, the third insert fails, then i have to revert, those particular changes in that Set function call. Now i dont see any sqlite3_commit function exposed. I only see a function called sqlite3_commit_hook() which is slightly diff in documentation. Are there any function exposed for this purpose? or What is the way to achieve this behaviour? Can you help me with the best approach of doing this. Regards, Arjun

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• how to use php to include an image in a word file?

  - by altvali

  Hi all! Somebody has asked me to make an app in php that will generate a .doc file with an image and a few tables in it. My first approach was: somethingsomething else cevaaltceva'); fclose($fh); ? This uses the data uri technique of embedding an image. This will generate an html file that will be rendered ok in web browsers but the image is missing in Microsoft Office Word, at least in the standard setup. Then, while editing the file with Word, i've replace the image with an image from file and Microsoft Word changed the contents of the file into Open XML and added a folder, new_files where he put the imported image (which was a .png), a .gif version of the image and a xml file: Now this isn't good enough either since i want this to be all kept in a single .doc file. Is there a way to embed an image in an OpenXML-formatted .doc file? Any help will be much appreciated.

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• Comments on this assumption about running on dev server vs a real instance in app engine (python)?

  - by Jacob Oscarson

  Hello app engineers! I'm on an app engine project where I'd like to put in a link to a Javascript test runner that I'd like to only exist when running the development server. I've made some experiments on a local shell with configuration loaded using the technique found in NoseGAE versus live on the 'App Engine Console' [1] and it looks to me like a distinction btw real instance and dev server is the presence of the module google.appengine.tools. Which lead me to this utility function: def is_dev(): """ Tells us if we're running under the development server or not. :return: ``True`` if the code is running under the development server. """ try: from google.appengine import tools return True except ImportError: return False The question (finally!) would be: is this a bad idea? And in that case, can anyone suggest a better approach? [1] http://con.appspot.com/console/ (try it! very handy indeed)

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• How to? - part of the site over ssl, other part not

  - by spirytus

  What is common practice for coding web applications where part of the site has to be secured (e.g. checkout section) and part not necessarily, lets say homepage. As far as I know sharing sessions in between http and https parts of the site is not easily possible (or is it?). What would be common approach if I wanted to display on http page like homepage, shopping cart data (items) that users ordered on https pages? How those two parts of the site would communicate if necessary? Also isn't it security flaw in popular shopping carts as it seems that many of these have only checkout pages secured (ssl) and the rest not? I'm using php if it makes any difference.

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• Hide or Disable? In this example and in general...

  - by George

  I have the following set of controls. Scenario 1: If you select one of the first 3 radio buttons and click enter, focus will jump to the Passport Number text box. If the user selects "Other", the "Other, Please Specify" textbox is enabled and, for convenience, screen focus (the cursor is moved) to that textbox. Scenario 2: The "specify Other" text box is hidden until the user clicks on the Other Radio button. Upon doing so, the textbox is made visible and the cursor is placed in this textbox. Which scenario do you feel is a better approach? Perhaps you have another variation? Please state your reasoning. I would also appreciate it if you could make a generalized statement as to when hiding is better than disabling or vice versa, but I am also interested in this particular example. Thanks. Afetrthought: Perhaps, in the 2nd example, the "Please Specify" text would only appear after the user has selected the 'Other' radio button.

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• Is it a good idea to use only a key to encrypt an entire (small) filesystem?

  - by Fernando Miguélez

  This question comes as part of my doubts presented on a broader question about ideas implementing a small encrypted filesystem on Java Mobile phones (J2ME, BlackBerry, Android). Provided the litte feedback received, considering the density of the question, I decided to divide those doubts into small questions. So to sum up I plan to "create" an encrypted filesystem for for mobile phones (with the help of BoucyCastle or a subset of JCE), providing an API that let access to them in a transparent way. Encryption would be carried out on a file basis (not blocks). My question is this: Is it a good idea to use only a simmetric key (maybe AES-256) to encrypt all the files (they wouldn't be that many, maybe tens of them) and store this key in a keystore (protected by a pin) or would you rather encrypt each file with an on-the-fly generated key stored alongside each file, encrypting that key with the "master" key stored on the keystore? What are the benefits/drawbacks of each approach?

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• Assistance with regular expressions in Python

  - by da5id

  I am still learning REGEX, and I've run into an issue ... I am trying to separate a string that is composed of a mixture of letters and numbers that are in decimal format: AB0.500CD1.05EF2.29 Into something like this: list1 = AB,CD,EF list2 = 0.500,1.05,2.29 A complication to all this is that I also have strings that look like this: AB1CD2EF3 Which I'd also like to separate into this: list1 = AB,CD,EF list2 = 1,2,3 A previous inquiry yielded the following snippet, import re pattern = re.compile(r'([a-zA-Z]+)([0-9]+)') for (letters, numbers) in re.findall(pattern,cmpnd): print numbers print letters This example works fine for strings of the 2nd kind, but only "finds" the leading digit in the numbers that contain decimal places in the strings of the first kind. I've attempted an approach using the following line: pattern = re.compile(r'([a-zA-Z]+)([0-9]+(\.[0-9]))') But this results in an error: "ValueError: too many values to unpack" Thanks for any and all assistance!

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• Why does casting to double using "String * 1" fail? Will CDbl(String) work on all systems?

  - by Jamie Bull

  I have an application which contains the line below to assign a parsed XML value to a variant array. V(2) = latNode.Text * 1 This works fine on my system (Windows 7, Excel 2010) but doesn't work on some other system or systems - and I've not been able to get a response from the user who reported the problem. I've switched out the offending line for: V(2) = CDbl(latNode.Text) This still works on my system, but then I had no problem in the first place. The question is on what systems does the first approach fail and why, and will the second method always work? I'm sure I've used the "Stying * 1" trick elsewhere before and would like to know how concerned I should be about tracking down other occurrences. Thanks.

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• Validate XML instance document against WSDL

  - by Ice09

  Hi, I can easily validate a XML document against a XML Schema, eg. with XMLSpy or programmatically. Is it possible to do this with a WSDL file? It does not seem possible with XMLSpy or any other XML tool I know. For me the only possibility right now is to do it programmatically, eg. by generating Java code from the WSDL and starting a request, which is then marshalled correctly. If there is no tool / easy programmatic approach, is there a tool which can extract XML Schema from the WSDL? Best

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• Reuse C++ Header files

  - by Amrish

  Guys, I have a Visual C++ solution with 2 projects AlgorithmA & AlgorithmB and both share a common header file RunAlgo.h with the class declaration. Each project in the solution has its own unique implementation for the header file. I am trying to compile a DLL out of the common header file RunAlgo.h and add reference to this DLL in the projects AlgorithmA & AlgorithmB. I have then included separate RunAlgo.cpp definition file in both my projects. The problem is that I am getting linker errors while compiling the new DLL project which has only the header file. So, the question is Can a header file with only class declaration be compiled into a DLL (Similar to class library containing an Interface in C#)? For the above scenario, is there a better approach to reuse the common Header file among projects? Should the above method work (re-check my code?)

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• Getting Database Data to the client side.

  - by Toby Allen

  I'm sure this has been asked a million times, but what is the accepted approach to this? I have been writing php code for a while and up until recently I only copied+pasted javascript code, but now with help from YUI I've begun to understand javascript and want to use it more in an existing web app I have. I want to get various amounts of data from databases etc to the clientside javascript. I have access to this data in my php pages when loading. What is the correct way to get this data to my client side script. Generate clientside javascript in my php or smarty template files inserting the data where I need it? Use an Ajax call to retrieve the information I need from a php file - returning JSON data? Generate a JSON data construct of the data needed by the page and either return it via a script inclusion or dumping it to the generated page? Something really obvious I haven't thought of.

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• Iterate over a list and put data in hashmap

  - by sarah

  I am having a list where i need to loop over it and put its data in hashmap,i am using this approach for(int i=0;i<list.size();i++) { HashMap hMap=new HashMap(); hMap.put("Data", list); } But when i need to read the value from hMap i am doing in this way Collection c = hMap.values(); Iterator itr = c.iterator(); while(itr.hasNext()) { System.out.println("next val is--"+itr.next()); } next vali is--- is printed in com.bean.xyz@23032bc[id=1] format ,i need the exact data,how will i do this ?

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• Global variables in hadoop.

  - by Deepak Konidena

  Hi, My program follows a iterative map/reduce approach. And it needs to stop if certain conditions are met. Is there anyway i can set a global variable that can be distributed across all map/reduce tasks and check if the global variable reaches the condition for completion. Something like this. While(Condition != true){ Configuration conf = getConf(); Job job = new Job(conf, "Dijkstra Graph Search"); job.setJarByClass(GraphSearch.class); job.setMapperClass(DijkstraMap.class); job.setReducerClass(DijkstraReduce.class); job.setOutputKeyClass(IntWritable.class); job.setOutputValueClass(Text.class); } Where condition is a global variable that is modified during/after each map/reduce execution.

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• Rails - inheritance hierarchy of classes where an subtipe can play two roles

  - by Miquel

  I need to model Owners and Rentees in an application, so you have stuff that is always owned by someone and can be rented for someone else. I first approached this problem with Single Table Inheritance because both types of person will share all attributes, so you would have a model called Person associated to a table people with Owner and Rentee inheriting from Person. The problem is that Single type inheritance discerns subtypes using a field type and therefore a record in the table can represent either an Owner or a Rentee but not both at the same time, while in the real context you can have an Owner which is renting something from another Owner and therefore that person is at the same time an Owner and a Rentee. How would you approach this problem? Would you use separated tables fro owners and rentees? Is there any other type of table inheritance in Rails?

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• Can I add Controls that are not ListItems to a RadioButtonList?

  - by Simon Martin

  I need to provide a way to allow users to select 1 Subject, but the subjects are grouped into Qualifications and so I want to show a heading for each 'group'. My first thought is an asp:RadioButtonList as that provides a list of options from which only one can be selected but there's no means to add break the list up with headings. So I tried the following code - but I can't see that the LiteralControl is being added, which makes me think it's not a valid approach. For Each item As Subject In Qualifications If item.QualCode <> previousQualCode Then rblSelection.Controls.Add(New LiteralControl(item.QualName)) End If rblSelection.Items.Add(New ListItem(item.SubjectName, item.SelectionCode)) previousQualCode = item.QualCode Next

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• spring or jetty.xml?

  - by Justin

  I have a spring web application (currently packaged as a war file) which I would like to be able to launch from jetty in a stand-alone configuration (small scale all-in-one deployment, and for launching in the development environment). Since I am already using spring, it seems like what I want to do is create my jetty Server and WebContext objects, and initial JNDI context using spring. However this seems to overlap with the jetty.xml method of configuring the same environment. Is one approach better? Is the does jetty.xml offer anything easier than I can get using spring?

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• resort on a std::vector vs std::insert

  - by Abruzzo Forte e Gentile

  I have a sorted std::vector of relative small size ( from 5 to 20 elements ). I used std::vector since the data is continuous so I have speed because of cache. On a specific point I need to remove an element from this vector. I have now a doubt: which is the fastest way to remove this value between the 2 options below? setting that element to 0 and call sort to reorder: this has complexity but elements are on the same cache line. call erase that will copy ( or memcpy who knows?? ) all elements after it of 1 place ( I need to investigate the behind scense of erase ). Do you know which one is faster? I think that the same approach could be thought about inserting a new element without hitting the max capacity of the vector. Regards AFG

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• JPA atomic query/save for multithreaded app

  - by TofuBeer

  I am in the midst of changing my JPA code around to make use of threads. I have a separate entity manager and transaction for each thread. What I used to have (for the single threaded environment) was code like: // get object from the entity manager X x = getObjectX(jpaQuery); if(x == null) { x = new X(); x.setVariable(foo); entityManager.persist(x); } With that code in the multi threaded environment I am getting duplicate keys since, I assume, getObjectX returns null for a thread, then that thread is swapped out, the next thread calls getObjextX, also getting null, and then both threads will create and persist a new X(). Short of adding in synchronization, is there an atomic way to get/save-if-doesn't-exist a value with JPA or should I rethink my approach EDIT: I am using the latest Eclipselink and MySql 5.1

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• What is the default fontsize, fontname and shadow for titles in Navigation Bar?

  - by user292952

  I'm trying to have a button on the self.navigationItem.rightButton that toggles a segmented control that is placed in self.navgivationItem.titleView .. this will however remove the title that is first set by self.title when the navbar is created .. I dont know if my approach is bad but I figured I could rotate between a UILabel and the Segmented Control in the titleView. It works as I would like it to, however I cant figure out what size and font and shadowoffset and shadowcolor the default titles in a navigation bar is .. could you help me with a solution that either not force me to override the navigationItem.titleView or help me figure out the information needed to make a UILabel look exactly like the default titles. Thankful for any help.

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• Using custom HTML attributes for JavaScript purposes?

  - by user1103990

  One of my colleagues doesn't like to use HTML classes and ids for javascript/jQuery purpose. Therefore I've seen that he had created custom html attribute such as <div id="myid" class="cssClasses ..." [some-purpose-id]="mycustomId">...</div> I asked him if it was really a good idea and he replied that he considers that classes and Ids should be reserved for styling. Personally, I would have used classes. Some classes would have been used for styling, and some other classes would have been used for programming (jQuery selectors). The idea is to keep things appart also. And of course jQuery could set styling classes but if possible not use them for selection. Of course I also use id when appropriate but since an id is unique on a page, I like to do generic stuff using classes. I would like to know you opinions on the better approach (if there is one). Thank you.

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• Merging contents of two lists based on a if-loop

  - by chavanak

  I have a minor problem while checking for elements in a list: I have two files with contents something like this file 1: file2: 47 358 47 48 450 49 49 56 50 I parsed both files into two lists and used the following code to check for i in file_1: for j in file_2: j = j.split() if i == j[1]: x=' '.join(j) I am now trying to get a "0" if the value of file_1 is not there in file_2 for example, value "48" is not there is file_2 so I need to get the output like (with only one space in between the two numbers): output_file: 358 47 0 48 450 49 56 50 I tried using the dictionary approach but I didn't quite get what I wanted (actually I don't know how to use dictionary in python correctly ;)). Any help will be great.

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• Best way to handle enable/disable of UIButtons on iPhone

  - by Anonymous

  I have an increase button and a decrease button, both of which affect a variable. The variable has a minimum and the decrease button will be disabled once that minimum is reached. Likewise for the maximum value of the variable. In my controller, I have two IBActions for both the increase and decrease actions, and two IBOutlets, in order to disable the buttons accordingly. At the bottom of my KVO statement to handle the value change, I have: increaseButton.enabled = value != MAX; decreaseButton.enabled = value != MIN; While this code is functional, I can't help but feel that feel this is a naive approach to the problem, especially since this requires 4 connections. Is there a better solution to this, one that uses fewer connections?

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• Software automation testing

  - by dotnet-practitioner

  I work in a .net shop where we need to automate software testing. We write ASP.net web apps, web services, windows services, scheduled console application. Back end for all these applications is SQL Server. We would like to automate testing of any bug fixes, any where from web UI change to, middle tier .net code change to sql code change. This tool would be used by programmers to do unit test and played back in different test environments to ensure that bug fix is test correctly in all the environments including the produciton environment. This test would be executed by different teams such as QA, Build, and production site testers. What tool or approach do you recommend?

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• mapping 'value object' collection in (Fluent) NHibernate

  - by adrin

  I have the following entity public class Employee { public virtual int Id {get;set;} public virtual ISet<Hour> XboxBreakHours{get;set} public virtual ISet<Hour> CoffeeBreakHours {get;set} } public class Hour { public DateTime Time {get;set;} } (What I want to do here is store information that employee A plays Xbox everyday let's say at 9:00 13:30 and has a coffee break everyday at 7:00 12:30 18:00) - I am not sure if my approach is valid at all here. The question is how should my (ideally fluent) mappings look like here? It is not necessary (from my point of view) for Hour class to have Id or be accessible from some kind of repository.

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• What is the best way to find the digit at n position in a decimal number?

  - by Elijah

  Background I'm working on a symmetric rounding class and I find that I'm stuck with regards to how to best find the number at position x that I will be rounding. I'm sure there is an efficient mathematical way to find the single digit and return it without having to resort to string parsing. Problem Suppose, I have the following (C#) psuedo-code: var position = 3; var value = 102.43587m; // I want this no ? (that is 5) protected static int FindNDigit(decimal value, int position) { // This snippet is what I am searching for } Also, it is worth noting that if my value is a whole number, I will need to return a zero for the result of FindNDigit. Does anyone have any hints on how I should approach this problem? Is this something that is blaringly obvious that I'm missing?

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