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• MySQL indexes - what are the best practises?

  - by Haroldo

  I've been using indexes on my mysql databases for a while now but never properly learnt about them. Generally I put an index on any fields that i will be searching or selecting using a WHERE clause but sometimes it doesn't seem so black and white. What are the best practises for mysql indexes? example situations/dilemas: If a table has six columns and all of them are searchable, should i index all of them or none of them? . What are the negetive performance impacts of indexing? . If i have a VARCHAR 2500 column which is searchable from parts of my site, should i index it?

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• How to control utf-8 string paddings

  - by Kev

  I got three UTF-8 stings: hello, world hello, ?? hello, ?rld I only want the first 10 chars so that the bracket in one column: [hello, wor] [hello, ? ] [hello, ?r] In console: width('??')==width('worl') width('? ')==width('wor') #a white space behind '?' python's format() doesn't help when UTF-8 chars mixed in >>> for s in ['[{0:<{1}.{1}}]'.format(s, 10) for s in ['hello, world', 'hello, ??', 'hello, ?rld']]: ... print(s) ... [hello, wor] [hello, ?? ] [hello, ?rl] So, I wonder if there is a standard way to do the UTF-8 padding staff?

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• How do you escape parentheses in a Binding indexer

  - by Chris S

  I have the following XAML: <Grid x:Name="LayoutRoot" Background="White" DataContext="{Binding Source={StaticResource MyDataKey}}"> <TextBox Name="_myId" Text="{Binding MyDictionary[(Textbox.Name)]" /> </Grid> But it thinks the key in my dictionary is called "(Textbox.Name)", instead of "_myId". The format below works, where I have a property in my class called "_myId": <TextBox Name="_myId" Text="{Binding (Textbox.Name)" /> I've tried using ^ and \ to escape the brackets. Is this syntax supported? I'm trying to avoid duplication of the name in two attributes.

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• Develop iPhone application remotely?

  - by ANE

  4 java developers are new to iPod Touch/iPhone app development. They have an idea for an app. They have never used Xcode or Macs before. Instead of spending money for a new iMac or Mac Mini for each of them, my boss would like to sell them a $999 Apple server, hosted at a facility connected a single T1 line, and have all 4 people work remotely in Xcode. Is this feasible? Is anyone doing anything like this? Specifically, is 1 T1 enough for realistic remote app development? Would they have to work in black & white via Logmein or Gotomeeting to get decent speed? Can four people work remotely together on an Xcode project at the same time? Do they absolutely need their own Macs to connect their iPod Touches or iPhones physically to, or can they connect to their existing PCs with iTunes and install their in-development apps that way?

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• Finding center of fingerprints.

  - by an_ant

  If we suppose that every fingerprint is made of concentric curves (ellipses or circles) - and I'm aware of the fact that not every fingerprint is - how can I find center of those concentric curves? Let's take this "ideal" fingerprint and try to find out its center ... My approaches were to try: Find the spectrum through columns/rows of the image and try to find columns/rows that maximize particular band of the spectrum. I thought that column going through the center would have most regular pattern of changing amplitudes - therefore, most recognizible harmonic. My second approach was to try to count the changes of black-and-white also through the columns and rows, and to maximize that amount among rows and columns also. While these methods work to the some extant, with some additional filtering, they fail, when fingerprint is "not ideal as this one is". Can you think of any different approach? Are there standard ways to do it?

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• Adding on touch event to images inside gridview

  - by Steve

  I have a gridview where each item has a image and a textview (an app), i added the onItemClick to the gridview in order to launch the app, i also removed the orange selection and made selector in xml so when pressed the text would change to grey and on release it would return to white. My problem is that i need the image to apply an alpha value when pressed and restore the previous alpha on release i tested a lot of ways and none did worked correctly. I came close with the updated answer from the autor of the question: How to set alpha value for drawable in a StateListDrawable?, but some how the state pressed never gets called, i don´t know if this is because i am using the onitemClick to launch the app or not. Also i since i can´t define the alpha on imageview xml i don´t know what else to do Any help will be appreciated

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• How do I split Chinese characters one by one?

  - by Nano HE

  If there is no special character(such as white space, : etc) between firstname and lastname. Then how to split the Chinese characters below. use strict; use warnings; use Data::Dumper; my $fh = \*DATA; my $fname; # ??; my $lname; # ? ; while(my $name = <$fh>) { $name =~ ??? ; print $fname"/n"; print $lname; } __DATA__ ??? Output ?? ?

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• background semitransparent div

  - by plasticrabbit

  I want to show some dialog (absolute positioned div), and I want to show it above semitransparent 100% div, so everything on background will be dimmed. I have managed it by <div class='transpBox'></div> .transparentBox { position: absolute; top: 0px; left: 0px; width: 100%; height: 100%; background-color: #white; opacity: 0.9; z-index: 499; } This is all right, but when dialog height is more than browser height and you scroll down, you see that transparent div is not in full screen. What is proper way to make such thing?

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• innerHTML parse for Google Chrome?

  - by user554095

  Hey all. I am adding text to a textArea via Javascript in Chrome (doing it a totally different way in Firefox/IE as Chrome does not support contentWindows). Here is my code: document.getElementById("vB_Editor_001_textarea").value += '<font color="white"><b>' + numberLabel + ':</b> ' + armory + '</font><br/>'; This HTML is getting put directly into the textArea without being parsed. How can I make it parse into regular text with the HTML markup when it hits the textArea? Thanks!

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• Hold border and Resize two or more DIV simultaneously in the same container

  - by Manu

  Code : <div id="widget1"> <div class="part blue">this is the part</div> <div class="part white">of the genial</div> <div class="part red">and good widget</div> </div> Let's say that div#widget1 is 99px width and div.part are 33px by default. How can I easily resize div.blue by increasing its width and deacreasing width of other div.part proportionnaly ? http://jqueryui.com/demos/resizable/#synchronous-resize : give an example which show element increase in the same time. Thanks,

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• java graphics display help

  - by java

  I know that i am not calling the graphics paint command in the mainframe in order to display it. but i'm not sure how. thanks in advance import java.awt.*; import javax.swing.*; public class MainFrame extends JFrame { private static Panel panel = new Panel(); public MainFrame() { panel.setBackground(Color.white); Container c = getContentPane(); c.add(panel); } public void paint(Graphics g) { g.drawString("abc", 20, 20); } public static void main(String[] args) { MainFrame frame = new MainFrame(); frame.setVisible(true); frame.setSize(600, 400); frame.setResizable(false); frame.setLocationRelativeTo(null); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } }

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• How to set Single GtkLebel Color to while using gtkrc?

  - by PP

  How to set Single GtkLebel Color to while using gtkrc? I tried to set as follows: In rc file: style "tc-theme-label-white" { xthickness = 1 ythickness = 1 font_name = "Sans Bold 8" text[NORMAL] = "#FFFFFF" text[INSENSITIVE] = "#434346" text[PRELIGHT] = "#FFFFFF" text[SELECTED] = "#FFFFFF" text[ACTIVE] = "#FFFFFF" } widget "*.my-theme-label" style:highest "my-theme-label" //And in code i have written. Gtk *label = gtk_new_label(null); gtk_widget_set_name(label_ptr, "my-theme-label"); Is this the write way of doing it? as usual it is not working. :p Thanks, PP.

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• How to ensure the HTTP_REQUEST Is coming from the right place?

  - by seatoskyhk

  I learn that HTTP_REFERER or any HTTP request header can be fake and not reliable. REMOTE_ADDR is reliable though. so, how can I ensure the incoming HTTP_REQUEST call is coming from a website that I white-list? For example, I have a js code that will send from client site to server. (something like a sniper, cross platform). however, I only allow this happen from several websites. Not others. so, even other people copy the code and put onto their website, it won't work.

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• CSS bug in text input field - MSIE7

  - by Uri Bruck

  I have an input text in a form that has a problem in MSIE7. When the text field is filled and I continue typing, the background starts scrolling left along with the text. This is the form when the text field is filled http://img155.imageshack.us/i/screen2rl.jpg/ The background image, a white rectangle with rounded corners, scrolls left with the text, leaving the black background. This is the CSS for this text field: border: none; background: url('/wp-content/themes/pokerbuddy/images/field.png') top left no-repeat; width: 100px; height: 20px; padding: 0px; font-size: 80%; color: #399; display:inline; Is there any way to solve this in MSIE7?

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• Navigation Bar color doesn't change back? iOS7

  - by TKP

  I have several tableviews with navigation controller. The navigation bar is white for all the views except the last one, which is red. I have [[[self navigationController] navigationBar] setTintColor:[UIColor redColor]; in the viewDidLoad of the last tableview and [[[self navigationController] navigationBar] setTintColor:[UIColor whiteColor]; in the viewDidLoad of other table views. It works fine until I get to the last view and the color of the navigation bar changes to red. When I go back to the previous views, all the previous views' navigation bar has changed to red. Where should I put those codes so the color will remain unchanged? Thanks,

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• WPF: In Expression Blend, how to change Foreground of a custom button with a Border on different states?

  - by SubmarineX

  In Expression Blend 4, I want to change the Foreground of a custom button on different states. I'm just able to change the Background and BorderBrush. Just like this: If the state is "Normal", the color of text "Button" is Black, while the state is "Pressed", the color of text "Button" is White. On Brushes Panel under Properties Panel, there're 3 properties but no Foreground property: Who can help me? I'm so perplexed. Edit I find ContentControl have a Foreground property, but ContentPresenter haven't. Wether I should use ContentControl instead of ContentPresenter?

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• Most optimal way to detect if black (or any color pixels) exist in an image file?

  - by Zando

  What's the best and most flexible algorithm to detect any black (or colored pixel) in a given image file? Say I'm given an image file that could, say, have a blue background. And any non blue pixel, including a white pixel, is counted as a "mark". The function returns true if there are X number of pixels that deviate from each other at a certain threshold. I thought it'd be fastest to just simply iterate through every pixel and see if its color matches the last. But if it's the case that pixel (0,0) is deviant, and every other pixel is the same color (and I want to allow at least a couple deviated pixels before considering an image to be "marked), this won't work or be terribly efficient.

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• String.split() - matching leading empty String prior to first delimiter?

  - by tehblanx

  I need to be able to split an input String by commas, semi-colons or white-space (or a mix of the three). I would also like to treat multiple consecutive delimiters in the input as a single delimiter. Here's what I have so far: String regex = "[,;\\s]+"; return input.split(regex); This works, except for when the input string starts with one of the delimiter characters, in which case the first element of the result array is an empty String. I do not want my result to have empty Strings, so that something like, ",,,,ZERO; , ;;ONE ,TWO;," returns just a three element array containing the capitalized Strings. Is there a better way to do this than stripping out any leading characters that match my reg-ex prior to invoking String.split? Thanks in advance!

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• how to make a border area go around the content of a page where there is a footer fixed to the bottom of the page and an header fixed to the top

  - by user277498

  consider the following: http://jsfiddle.net/PxabT/10/ There are 3 divs hd, bd, ft. hd is fixed to the top. ft is fixed to the bottom. I want the lime colored border to go totally around the white central area without increasing the height of the ft or hd divs. How do I achieve that? Many thanks! edit: see http://jsfiddle.net/PxabT/15/ which is a step forward by changing the borders to padding.

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• Problems with viewing site in Internet Exploder

  - by Kevin

  I built a site and I'm just about finished. It displays properly in all the browsers I have (Safari, Chrome, and Firefox) but my client is not computer savvy at all and still uses Internet Explorer, so that's all he's using to view the site. I don't have IE to test the site so I've been using BrowserStack.com and I see in IE that the site is broken. The navigation bar has a white background and is pushed down a line, and the logo isn't appearing. Could anybody please assist me with figuring out why the site isn't displaying properly in IE, and how to fix it? Help is greatly appreciated. Thanks Site: WebuildCAhomes dot com

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• Why are IE6 and IE7 not completely showing this div?

  - by Qwibble

  I'm having problems in IE6 and 7 with a div that doesn't complete the bottom padding that is attributed to it, so doesn't appear to finish the div down to the white content area like required. Here's the coded homepage with the problem. http://qwibbledesigns.co.uk/preview/Softwear/ The div house's this content: Services : Design, Xhtml, Css, Flash Client : Newsletter Entrepeneur I've tried display it as all sorts, clearing the div, and so on. I can't make heads or tails of it. Does anyone know what I can do to fix it? Any answers are greatly appreciated =S

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• QT Question - What are all these extra spaces for ? (pic provided)

  - by mea

  stack overflow wont let me post images so heres the link: http://4m0.org/images/qt.png This is my application. For this question, ignore the top part with the buttons. I have a QScrollArea Filled with many QGroupBoxes Filled with a horizontal box layout of QLabel (on the left) and QGroupBox (on the right) The right side is a vertical box layout of QPushButtons Every single element, the scrollarea, both boxes, the labels, and the buttons all have their style sheets modified so padding is 0px and margin is 0px. Why do i have all this extra space? The scroll area has space on all sides until its inner elements (the blue boxes) start. Then those boxes have space until its inner elements (the white boxes) start. Can someone tell me what is going on?

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• Converting a Matrix to a grid of colors

  - by Zach

  I'm currently making a console application in C# (will be going to a Windows Form application in the future. Sooner if needed). My current objective is to have a matrix (current size 52x42) be exported as an image (bitmap, jpeg, png, I'm flexible) where each value in the matrix (0, 1, 2, 3) is portrayed as a white, black, blue, or red square of size 20px x 20px with a grid 1px wide seperating each 'cell'. Can this even be done in a console application, and if so how? If not, what would I need to get it working in a Windows Form application?

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• slideIn and slideOut reduces width of component

  - by shub

  Can someone help me to solve the problem of reducing the width of the component during SlideIn or SlideOut? I am using the Ext JS version 4.1 RC1. Ext.onReady(function () { Ext.create('Ext.container.Viewport', { layout: 'border', items: [{ region: 'north', autoHeight: true, border: false, margins: '0 0 5 0', items: [{ xtype: 'container', id: 'con_notification-box', cls: 'notification-box', hidden: true, border: true, width: 500, height: 0, style: { position: 'fixed', minHeight: '75px !important', left: '50%', marginLeft: '-250px', zIndex: '999999', backgroundColor: 'white' }, items:[{ xtype: 'container', html: '<p>Insert your information text here.</p>' },{ xtype: 'container', id: 'con_application-close', cls: 'notification-close', html: '<br />Close' }] },{ xtype: 'container', html: '<h1 class="x-panel-header">Your title</h1>' }] }] }); var con_notification_box = Ext.getCmp('con_notification-box').getEl(); con_notification_box.slideIn('t', { easing: 'easeOut', duration: 500 }); Ext.getCmp('con_application-close').getEl().on('click',function(){ con_notification_box.slideOut('t', { duration: 2000 }); }); }); I'd be very grateful if you could help me. Kind regards, shub

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• UITextView refuses to change its color

  - by Friendlydeveloper

  Hello, in some cases things you'd expect to solve within a sec turn out to become a lifetime adventure. This is one of these cases :) All I wanted to do, is simply change the text color of one of my UITextViews. So far I tried: UIColor *myColor = [UIColor colorWithHue:38 saturation:98 brightness:100 alpha:1.0]; [myTextView setTextColor:myColor]; OR UIColor *myColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"colorImage.png"]]; [myTextView setTextColor:myColor]; Both seem to work fine for UILabels, but fail for UITextView elements. When I try [UIColor colorWithHue... I only get a reddish kinda color, no matter what values I choose (except values for black and white. They work). The colorWithPatternImage does not change textColor at all. Strange isn't it? I obviously must be missing something. Help is very much appreciated. Thanks in advance.

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