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Is Lucern.net good choice for website search of 1M item product database? (giving up on SQL Server

- by Pete Alvin

We currently have in production SQL Server 2005 and we use it's full text search for a eCommerce site search of a million product database. I've optimized it as much as possible (I think) and we're still seeing search times of five seconds. (We don't need site scrawl or PDF (etc.) document indexing features... JUST "Google" speed for site search.) I was going to buy dtSearch but now I realize I can just use Lucerne.net and save the $2,500 for two server license. I read on a post that Lucerne.Net is not good for website searches. Has anyone else used Lucerne.Net from ASP.Net? Does it take a lot of memory? Any problems? Any comments?

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How to avoid SQLiteException locking errors

- by TheArchedOne

I'm developing an android app. It has multiple threads reading from and writing to the android SQLite db. I am receiving the following error: SQLiteException: error code 5: database is locked I understand the SQLite locks the entire db on inserting/updating, but these errors only seems to happen when inserting/updating while I'm running a select query. The select query returns a cursor which is being left open quite a wile (a few seconds some times) while I iterate over it. If the select query is not running, I never get the locks. I'm surprised that the select could be locking the db.... is this possible, or is something else going on? What's the best way to avoid such locks? Thanks TAO

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Workflow foundation 4.0 message correlation and error reporting

- by Lygpt

I have a workflow service that runs and performs a number of different operations (such as web service calls). If one of these operations fails I call an error reporting web service to notify a seperate system that one of my workflow operations has failed. As the error could be something like the web service being down, I loop and retry this operation until it works. There can be times though when the data I'm passing to this web service is faulty and it needs changing. So I need to be able to hook into this running (but delayed) workflow and change local workflow variables and then re-run the operation. I've looked at message correlation in workflow 4.0 to achieve this but because the delay activity is active in my running workflow instance, any second service call doesn't do anything (it's like the delay activity is blocking any other requests). I've tried setting 'CanCreateInstance' to both true and false but it doesn't help. Thanks!

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How to order <script> tags vs. <style> tags in HTML markup for best results.

- by Tchalvak

I'm building up my site over at http://royronalds.com, and I'm trying to figure out what order of elements in the <head> makes most sense. Just to take from what I current have, I have: <head> <style> external stylesheet <meta> <title> <link> to favicon <script> for jQuery <script> main javascript for site <script> google analytics, asynchronous script. </head> Are there reasons to order these differently so that load times and other issues happen more smoothly, and if so, what would the ideal order be?

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How do I define functions using PLT Scheme macros?

- by nickname

I am trying to write a macro that defines a special class of data structure with associated functions. I know this is possible; it is done multiple times in the core language itself. As a specific example, how would I define the define-struct macro in Scheme itself. It needs to create make-struct, struct-<<field>>, etc functions. I tried doing this using define, however, this only defines the function in the macro's lexical scope. How can I actually define a function in a macro?

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How to avoid the same calculations on column values over and over again in a select?

- by Peter

I sometimes write SELECTs on the form: SELECT a.col1+b.col2*c.col4 as calc_col1, a.col1+b.col2*c.col4 + xxx as calc_col1_PLUS_MORE FROM .... INNER JOIN ... ON a.col1+b.col2*c.col4 < d.some_threshold WHERE a.col1+b.col2*c.col4 > 0 When the calculations get rather involved and used up to 3-5 times within the same SELECT, I would really like to refactor that out in a function or similar in order to 1) hopefully improve performance / make use of cache 2) avoid forgetting to update one of the 4 calculations when I at a later stage realize I need to change the calculation. I usually have these selects within SPs. Any ideas?

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Installing Ruby Gems behind a Proxy

- by jjr2527

It appears this topic has been covered a few times before, but those solutions have only gotten me so far. I now have my sources properly updated and I am able to query for gems without an error but I keep getting empty results for my searches. I installed rubysspi and copied over the spa.rb file as mentioned in the readme. The readme also suggested using this line which did not work for me based on my install path: ruby -rspa 'C:\Program Files\ruby\gem' list --remote sspi So I switched it to my install directory off the root: ruby -rspa 'C:\ruby\gem' list --remote sspi But that also didn't work so a search for the gem file located it in the bin directory so this command finally worked for me: ruby -rspa 'C:\ruby\bin\gem' list --remote sspi But I got empty results back: *** REMOTE GEMS *** SO I tried other gems and had the same results. Then I listed my gem sources and rubygems is listed as expected. Am I missing something else? c:\ruby>gem sources *** CURRENT SOURCES *** http://rubygems.org

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How should I go about creating a point system for users like SO and yahoo answers?(PHP)

- by ggfan

I am creating a voting system for a Q&A site project in which if a user asks a question, he/she losses -5 points; answer a question +5, vote a question +1, etc. (kind of like SO and yahoo answers) --To create the basic arithmetic, I have a "users_points" table that relates the user_id and their total points. +---+---------+ | 1 | 100 | +---+---------+ | 2 | 54 | +---+---------+ --Basically if the users does certain task, it would + or - the points. How do I prevent users from say voting an answer up 100 times. ex: I want a user to be only able to vote once per question, etc.

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how 2 use logmath twice in same form(sphinx4)

- by Pradeep

i have configured sphinx with netbeans and its wroking fine. but im using a button to do the process. but after it recognisers. i want to do the process again. but then it gives a error saying the "logmath instance is already present" and saying cannot open the microphone. can someone give me a solution. what i want to do is use speech recogntion in several times in the same form. till it gives the correct answer. please help me this is the error i get "Creating new instance of LogMath while another instance is already present 10:53:27.833 SEVERE microphone Can't open microphone line with format PCM_SIGNED 16000.0 Hz, 16 bit, mono, 2 bytes/frame, big-endian not supported."

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How to keep a process running on a remote windows server

- by DutrowLLC

I need to implement a background process that runs on a remote windows server 24/7. My development environment is C#/ASP.NET 3.5. The purpose of the process is to: Send reminder e-mails to employees and customers at appropriate times (say 5:00PM on the day before a job is scheduled) Query and save GPS coordinates of employees when they are supposed to be out on jobs so that I can later verify that their positions were where they were supposed to be. If the process fails (which it probably will, especially when updates are added), I need for it to be restarted immediately (or within just a few minutes) as I would have very serious problems if this process failed to send a notification, log a GPS coordinate, or any of the other tasks its meant to perform.

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Spring Weblfow 2 - Double Submit

- by John W.

Hello All, I am investigating a possible issue with double submits and I am looking at the possibilty of a double submit from a webflow execution. I have read many times that webflow will handle double submits, there are plenty references here. However I then came across I a forum response on the spring source forums contradicting what I read saying, SWF synchronizes on the conversation. Only one request will be processed at a time per conversation. Take note that if you're using snapshots, then it's possible repeatedly clicking on the submit button will generate a second request. I would recommend setting history to invalidate or discard in the transition from your view-state. We do have snapshots enabled but the book notes that using snapshots actually allows to solve the double submits. Does anyone have any insight on this? Thanks.

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proper way to solve mysql max user connection error

- by Rahul a common name

Hello every one, I'm using PHP with MYSQL database as both are open source and easy to use. I'm getting problem when I execute insert and/or update of millions of row one after another while this operation perform I got the MYSQL error that: 'max_user_connections' active connections which is the best way to solve this problem. I don't want to use another database or language other then PHP. connect_db(); $query = "insert into table(mobno,status,description,date,send_deltime,sms_id,msg,send_type) values('".$to."','".$status."','".$report."','','".$timewsha1."','".$smsID."','','".$type."')"; $result = mysql_query($query) or ("Query failed : " . mysql_error()); this query will execute thousand of times. and then server give connection error.

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iPhone OS: implementing your own achievements, how do I do it?

- by nickthedude

I'm working on a game where really the only game part is (at least right now) that the user can unlock achievements as she does various things throughout the game. I have a database that can keep track of certain user actions and record how many times a user does something but I'm having trouble figuring out the best way to architect the app so that I have to do the least amount of work. Kind of suck with the timing because gamecenter is not ready and it seems like openfeint is changing gears, but maybe I'm wrong. I'd prefer to do everything "in house" if it is not too ridiculous. looking for suggestions. Thanks, Nick

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Best ORM, Simple data Structures, Strong Query analysis.

- by sayth

What is the best ORM db combination for simple data structures. That is data that contains names as identifiers and locations, but whose main interaction will be numerical data for times(sports durations), and currency related data. I initially want to create a sports data base that will take names and statistics. Secondarily I plan to start into an investment and stock analysis db. Which ORM suits storing many numerical types and have strong query functions? I really am not biased to db engine (most likely use sqlite or mongo) so any suggestions to best network less db server to suit said ORM appreciated.

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Android MediaPlayer crashing app

- by user1555863

I have an android app with a button that plays a sound. the code for playing the sound: if (mp != null) { mp.release(); } mp = MediaPlayer.create(this, R.raw.match); mp.start(); mp is a field in the activity: public class Game extends Activity implements OnClickListener { /** Called when the activity is first created. */ //variables: MediaPlayer mp; //... The app runs ok, but after clicking the button about 200 times on the emulator, app crashed and gave me this error https://dl.dropbox.com/u/5488790/error.txt (couldn't figure how to post it here so it will appear decently) i am assuming this is because the MediaPlayer object is consuming up too much memory, but isn't mp.release() supposed to take care of this? What am i doing wrong here?

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Why doesn't this Ruby on Rails code work as I intend it to?

- by Justin Meltzer

So I attempted to build what I asked about in this question: Fix voting mechanism However, this solution doesn't work. A user can still vote however many times he or she wants. How could I fix this and/or refactor? def create @video = Video.find(params[:video_id]) @vote = @video.video_votes.new @vote.user = current_user if params[:type] == "up" @vote.value = 1 else @vote.value = -1 end if @previous_vote.nil? if @vote.save respond_to do |format| format.html { redirect_to @video } format.js end else respond_to do |format| format.html { redirect_to @video } format.js {render 'fail_create.js.erb'} end end elsif @previous_vote.value == params[:type] @previous_vote.destroy else @previous_vote.destroy if @vote.save respond_to do |format| format.html { redirect_to @video } format.js end else respond_to do |format| format.html { redirect_to @video } format.js {render 'fail_create.js.erb'} end end end @previous_vote = VideoVote.where(:video_id => params[:video_id], :user_id => current_user.id).first end

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MYSQL Select and group by date

- by Gil

I'm not sure how create a right query to get the result I'm looking for. What I have is 2 tables. first has ID, Name columns and second has date and adminID, which is referenced from table 1 column ID. Now, what I want to get is basically number of times each admin loged in per day during the month. From structure like this one I want to get per day and month data so result would be similar to 1, 2, 2 march total 5 for admin 4. ID | Date ------------------ 4 | 2010/03/01 4 | 2010/03/04 4 | 2010/03/04 4 | 2010/03/05 4 | 2010/03/05

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Selection of parameters in Diffie-Hellman

- by allenzzzxd

Hello, maybe it's not so proper to ask this question here... anyway, I'm trying to use the gmp library for the implementation of DH, but the problem here I got is: Once, when I was doing the tests to observe the output, although big values of prime and the private keys were selected: p was about more than 300 digits long in decimal a, b were about 100 digits long finally I got a shared secret key which was extremely small, perhaps smaller than 10^8 in decimal... This problem didn't show up many times, in fact, during all the observation, it appeared just once...but still, this was not so good at all. So I wonder if there are some methods which can avoid this... Thanx a lot

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How to make a web browser with tabbed browsing with vb 2008?

- by felixd68

I've tried multiple times to create a web browser with tabbed browsing. I know that I have to use "tab control". I have succeeded in creating a semi-tabbed browsing. People are able to add new tabs, but the webbrowser component only appears in one tab page. Coding: Form1_Load: Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim Browse As New WebBrowser TabControl1.TabPages.Add(1, "TabPage" & i) TabControl1.SelectTab(1 - 1) Browse.Name = "wb" Browse.Dock = DockStyle.Fill TabControl1.SelectedTab.Controls.Add(Browse) i = i + 1 End Sub Web Browser Component Private Sub WebBrowser1_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) url.Text = e.Url.ToString() 'your url text box will show the actual url of the page after the page is fully loaded url.Text = e.Url.ToString Me.Text = CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).DocumentTitle & " - Webbrowser's name" TabControl1.SelectedTab.Text = CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).DocumentTitle End Sub

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Where to specify line height for sIFR

- by Darren

I have not had any luck changing the line height for sIFR. I have tried changing the sIFR css and config file as well as my general style sheet. Is there a special trick? GENERAL CSS h1 { font-family: Georgia, Times, serif; font-size: 24px; font-style: normal; line-height: 16px; (has had zero impact, even when I go negative) color: #000000; text-transform: uppercase; margin: 0; padding: 0; outline: none; } CONFIG FILE sIFR.replace(minionpro, { selector: 'h1', wmode: 'transparent', css: '.sIFR-root { color:#000000; text-transform: uppercase; }' });

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Google App Engine - Calling getSession().invalidate(); causes app engine to act weird.

- by Spines

When I call hreq.getSession().invalidate(); app engine slows down tremendously. I looked at appstats and saw that on a page where no database calls are made, it was calling memcache.get and datastore.get 23 times each. The stack trace of these calls showed that it was being called from getSession(). This only happens on the production server. Every time I make a request to a page, it makes a bunch of memcache and datastore calls. This slow down goes away though when i restart my browser. When I changed the code to simply set the isLoggedIn property of the session to false, rather than calling hreq.getSession().invalidate();, everything was fine. As a test, I didn't invalidate my session, but I changed the value of my browser's session cookie, and the app engine exhibited the same behavior. Is this a bug with the app engine?

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Code Golf: Beehive

- by LiraNuna

The challenge The shortest code by character count that will generate a beehive from user input. A beehive is defined a a grid of hexagons in a size inputted by the user as two positive numbers greater than zero (no need to validate input). The first number (W) represents the width of the beehive - or - how many hexagons are on each row. The second number (H) represents the height of the beehive - or - how many hexagons are on each column. A Single hexagon is made from three ASCII characters: _, / and \, and three lines: __ / \ \__/ Hexagons complete each other: the first column of the beehive will be 'low', and the second will be high - alternating and repeating in the same pattern forming W hexagons. This will be repeated H times to form a total of WxH hexagons. Test cases: Input: 1 1 Output: __ / \ \__/ Input: 4 2 Output: __ __ __/ \__/ \ / \__/ \__/ \__/ \__/ \ / \__/ \__/ \__/ \__/ Input: 2 5 Output: __ __/ \ / \__/ \__/ \ / \__/ \__/ \ / \__/ \__/ \ / \__/ \__/ \ / \__/ \__/ Input: 11 3 Output: __ __ __ __ __ __/ \__/ \__/ \__/ \__/ \__ / \__/ \__/ \__/ \__/ \__/ \ \__/ \__/ \__/ \__/ \__/ \__/ / \__/ \__/ \__/ \__/ \__/ \ \__/ \__/ \__/ \__/ \__/ \__/ / \__/ \__/ \__/ \__/ \__/ \ \__/ \__/ \__/ \__/ \__/ \__/ Code count includes input/output (i.e full program).

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Static Typing and Writing a Simple Matrix Library

- by duckworthd

Aye it's been done a million times before, but damnit I want to do it again. I'm writing a simple Matrix Library for C++ with the intention of doing it right. I've come across something that's fairly obvious in mathematics, but not so obvious to a strongly typed system -- the fact that a 1x1 matrix is just a number. To avoid this, I started walking down the hairy path of matrices as a composition of vectors, but also stumbled upon the fact that two vectors multiplied together could either be a number or a dyad, depending on the orientation of the two. My question is, what is the right way to deal with this situation in a strongly typed language like C++ or Java?

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Mimicking basic fcntl or SetHandleInformation call in .Net

- by Tristan

Tornado enables win32 support by faking Python's fcntl function using SetHandleInformation, which is available via ctypes on Windows. After some other small fixes, this actually works using IronPython on Windows as well (sadly, IronPython is five times slower). I'd like to get Tornado working on any CLI platform, such using Mono on OSX or Linux. Is there a managed, cross-platform, .Net approach that can fake fcntl? Here's the win32 code from Tornado: SetHandleInformation = ctypes.windll.kernel32.SetHandleInformation SetHandleInformation.argtypes = (ctypes.wintypes.HANDLE, ctypes.wintypes.DWORD, ctypes.wintypes.DWORD) SetHandleInformation.restype = ctypes.wintypes.BOOL HANDLE_FLAG_INHERIT = 0x00000001 F_GETFD = 1 F_SETFD = 2 F_GETFL = 3 F_SETFL = 4 FD_CLOEXEC = 1 os.O_NONBLOCK = 2048 FIONBIO = 126 def fcntl(fd, op, arg=0): if op == F_GETFD or op == F_GETFL: return 0 elif op == F_SETFD: # Check that the flag is CLOEXEC and translate if arg == FD_CLOEXEC: fd = int(fd) success = SetHandleInformation(fd, HANDLE_FLAG_INHERIT, arg) if not success: raise ctypes.GetLastError() else: raise ValueError("Unsupported arg") else: raise ValueError("Unsupported op")

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SQL model optimization question

- by supermogx

I need to keep track of number of "hits" on a particular item in a DB. The thing is that the "hits" should stay unique with a user ID, so if a user hits the item 3 times, it should still count for a hit of 1. Also, I need to display the total number of hits for a particular item. Is there a better way than to store each hits for each items by each users in a separate table? Would keeping the user ID in a string separated by commas a better and efficient way?

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