text stringlengths 0 30.5k | title stringclasses 1
value | embeddings listlengths 768 768 |
|---|---|---|
calculate the computing resources (CPU, RAM, disk space, and network bandwidth) that are necessary to support current and future usage levels. | [
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-0.05160675197839737... | |
Here is an example of what I've got going on:
```
CREATE TABLE Parent (id BIGINT NOT NULL,
PRIMARY KEY (id)) ENGINE=InnoDB;
CREATE TABLE Child (id BIGINT NOT NULL,
parentid BIGINT NOT NULL,
PRIMARY KEY (id),
KEY (parentid),
CONSTRAINT fk_parent FOREIGN KEY (parentid) REFERENCES Parent (id) ON DELETE CASCADE... | [
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0.579309463500976... | |
there is no ON DELETE CASCADE for the Uncle-Child relationship; i.e. deleting a Child does not delete its Uncle(s) and vice-versa.
When I have a Parent and an Uncle with the same Child, and I delete the Parent, it *seems* like InnoDB should be able to just "figure it out" and let the cascade ripple through the whole f... | [
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0.65991401672363... | |
(`id`))
```
InnoDB is trying to cascade-delete the Child before the Uncle(s) that refer to it.
Am I missing something? Is this *supposed* to fail for some reason I don't understand? Or is there some trick to making it work (or is it a bug in MySQL)?
The parent deletion is triggering the child deletion as you stated ... | [
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0.610036730766... | |
does not really 'figure out' stuff the way you imply here and it is just following its constraint rules. The problem is the schema you created in that it encounters a constraint that will not let it pass further.
I see what you are saying.. if it hit the uncle table first it would delete the record and then delete th... | [
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0.37867558002471... | |
for sure what is going on is to look through the code or get one of the mysql/postgresql programmers in here to say how it processes fk constraints. | [
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0.06989330798387... | |
If user input is inserted without modification into an SQL query, then the application becomes vulnerable to [SQL injection](https://stackoverflow.com/a/332367/), like in the following example:
```php
$unsafe_variable = $_POST['user_input'];
mysql_query("INSERT INTO `table` (`column`) VALUES ('$unsafe_variable')");
... | [
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-0.5053844451904297,
0.269403398036956... | |
possible to create an SQL statement with correctly formatted data parts, but if you don't *fully* understand the details, you should always **use prepared statements and parameterized queries.** These are SQL statements that are sent to and parsed by the database server separately from any parameters. This way it is im... | [
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0.5490407347679138,
-0.3710300028324127,
-0.1287434548... | |
MySQL):
```php
$stmt = $dbConnection->prepare('SELECT * FROM employees WHERE name = ?');
$stmt->bind_param('s', $name); // 's' specifies the variable type => 'string'
$stmt->execute();
$result = $stmt->get_result();
while ($row = $result->fetch_assoc()) {
// Do something with $row
}
```
If you're connecting to ... | [
-0.05046137422323227,
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-0.01981825940... | |
of creating a connection using **PDO** is:
```php
$dbConnection = new PDO('mysql:dbname=dbtest;host=127.0.0.1;charset=utf8mb4', 'user', 'password');
$dbConnection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
$dbConnection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
```
In the above example, the e... | [
-0.014864617958664894,
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0.040018223226070404,
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-0.5249749422073364,
0.14849212765... | |
`charset` in the options of the constructor, it's important to note that 'older' versions of PHP (before 5.3.6) [silently ignored the charset parameter](http://php.net/manual/en/ref.pdo-mysql.connection.php) in the DSN.
#### Mysqli
For mysqli we have to follow the same routine:
```php
mysqli_report(MYSQLI_REPORT_ERR... | [
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-0.5386314392089844,
0.039257850... | |
the parameter values you specify.
The important thing here is that the parameter values are combined with the compiled statement, not an SQL string. SQL injection works by tricking the script into including malicious strings when it creates SQL to send to the database. So by sending the actual SQL separately from the ... | [
0.3123207986354828,
-0.00004458318653632887,
0.15224450826644897,
0.291148841381073,
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0.14068736135959625,
0.6608599424362183,
-0.5756303668022156,
-0.098724447190... | |
above, if the `$name` variable contains `'Sarah'; DELETE FROM employees` the result would simply be a search for the string `"'Sarah'; DELETE FROM employees"`, and you will not end up with [an empty table](http://xkcd.com/327/).
Another benefit of using prepared statements is that if you execute the same statement man... | [
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0.09905827790498734,
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-0.1796749383211136,
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0.07788206636905... | |
queries?
----------------------------------------------------
While you can still use prepared statements for the query parameters, the structure of the dynamic query itself cannot be parametrized and certain query features cannot be parametrized.
For these specific scenarios, the best thing to do is use a whitelist ... | [
-0.2617974877357483,
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-0.06509442627429962,
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0.277537733316421... | |
I was going to ask a question here about whether or not my design for some users/roles database tables was acceptable, but after some research I came across this question:
[What is the best way to handle multiple permission types?](/questions/1451/what-is-the-best-way-to-handle-multiple-permission-types)
It sounds li... | [
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-0.46863269805908203,
0.40538305044174194,
0.48451974987983704,
-0.14029794931411743,
0.08619746565... | |
please explain the conversion process? It sounds "right", but I'm just not getting how I convert the roles to a decimal before it goes in the db, and how it gets converted back when it comes out of the db. I'm using Java, but if you stubbed it out, that would be cool as well.
Here is the original answer in the off cha... | [
0.07530749589204788,
0.012094119563698769,
0.1066972017288208,
0.07887072116136551,
-0.07335802912712097,
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0.045109935104846954,
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-0.5892320871353149,
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0.6499367356300354,
-0.1360834240913391,
-0.1498058140... | |
// 2^0 // 0000 0001
EDITUSERS = 2, // 2^1 // 0000 0010
VIEWPRODUCTS = 4, // 2^2 // 0000 0100
EDITPRODUCTS = 8, // 2^3 // 0000 1000
VIEWCLIENTS = 16, // 2^4 // 0001 0000
EDITCLIENTS = 32, // 2^5 // 0010 0000
DELETECLIENTS = 64, // 2^6 // 0100 0000
}
```
Then, you can combine several permissions... | [
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-0.3125069737434387,
0.0096276300027966... | |
which converted to decimal is 3.
You can then store the permission of one user into a single column of your DataBase (in our case it would be 3).
Inside your application, you just need another bitwise operation (OR) to verify if a user has a particular permission or not."
You use bitwise operations. The pseudo-code w... | [
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0.02161070518195... | |
your post, though whatever type it is needs to be based on an integer-like type. The same applies to the User.Permission field.
If those operators (&, |=, and &=) don't make sense to you, then read up on bitwise operations (bitwise AND and bitwise OR). | [
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0.016691716387867928,... | |
so, I'm running Apache on my laptop.
If I go to "localhost", I get the page that says,
> If you can see this, it means that the installation of the Apache web server software on this system was successful. You may now add content to this directory and replace this page.
except, I can't add content and replace that ... | [
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... | |
the server." So, I'm not even sure where that page is coming from. I've searched for words in that page under the apache directory, and nothing turns up. It seems to redirect somewhere.
Just as a test, I KNOW that it loads localhost/manual/index.html (doesn't matter what that is) so I tried to replace that with someth... | [
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0.2974600195... | |
Group/Apache2/manual/index.html for header \r\n
But, that page works fine if I open directly with a browser.
so, basically, I don't know what I don't know here. I'm not sure what apache is looking for. I'm not sure if the error is in my config file, my html page, or what.
Oh, and the reason I want to open this usi... | [
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-0.030565412715... | |
folder for Apache 2.2. When your site is ready, simply delete the existing files in the folder and replace them with those you want to test."
From [here](http://www.thesitewizard.com/apache/install-apache-2-windows.shtml). | [
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I have always wondered how people update a previous line in a command line. a great example of this is when using the wget command in linux. It creates an ASCII loading bar of sorts that looks like this:
> [======> ] 37%
and of course the loading bar moves and the percent changes, But it doesn't ma... | [
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0.007420762442052364,
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-0.26600608229637146,
0.26821351051330... | |
language of choice has bindings for it.
And a Google revealed [ANSI Escape Codes](http://en.wikipedia.org/wiki/ANSI_escape_code), which appear to be a good way. For reference, here is a function in C++ to do this:
```
void DrawProgressBar(int len, double percent) {
cout << "\x1B[2K"; // Erase the entire current lin... | [
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-0.3111856281757355,
0.14542840421199799,
-0.45632392168045044,
-0.04762472584... | |
progress += " ";
}
}
cout << "[" << progress << "] " << (static_cast<int>(100 * percent)) << "%";
flush(cout); // Required.
}
``` | [
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-0.04043767601251... | |
Every sample that I have seen uses static XML in the xmldataprovider source, which is then used to databind UI controls using XPath binding.
Idea is to edit a dynamic XML (structure known to the developer during coding), using the WPF UI.
Has anyone found a way to load a dynamic xml string (for example load it from a... | [
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0.15305806696414... | |
the xml. So I databind it to WPF UI controls on the WPF Window. How to make this work? All the samples over the web, define the whole XML inside the XAML code in the XmlDataProvider node. This is not what I am looking for. I want to use a xml string in the codebehind to be databound to the UI controls.
Here is some cod... | [
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0.13913719356060... | |
new XmlDataProvider();
if (provider != null)
{
System.Xml.XmlDocument doc = new System.Xml.XmlDocument();
doc.Load(fileName);
provider.Document = doc;
provider.XPath = "/opml/body/outline";
FeedListTreeView.DataContext = provider;
}
``` | [
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0.2419877201318... | |
I've been working through [Practical Common Lisp](http://gigamonkeys.com/book) and as an exercise decided to write a macro to determine if a number is a multiple of another number:
`(defmacro multp (value factor)
`(= (rem ,value ,factor) 0))`
so that :
`(multp 40 10)`
evaluates to true whilst
`(multp 40 13)`
does... | [
0.33018195629119873,
0.15467189252376556,
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0.4641066789627075,
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0.7218902111053467,
-0.31306692957878113,
-0.1332658082246... | |
once and in order, and `rem` doesn't have any side effects.
This is not good Lisp though, because there's no reason to use a macro in this case. A function
```
(defun multp (value factor)
(zerop (rem value factor)))
```
is identical for all practical purposes. (Note the use of `zerop`. I think it makes things cle... | [
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-0.32406824827194214,
0.6824781894683838,
-0.33628860116004944,
-0.159190639853... | |
Is there a way to change the appearance of an icon (ie. contrast / luminosity) when I hover the cursor, without requiring a second image file (or without requiring a hidden portion of the image)?
[Here's some good information about image opacity and transparency with CSS](http://www.w3schools.com/css/css_image_transpar... | [
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-0.376283764... | |
I have a little problem with a Listview.
I can load it with listview items fine, but when I set the background color it doesn't draw the color all the way to the left side of the row [The listViewItems are loaded with ListViewSubItems to make a grid view, only the first column shows the error]. There is a a narrow str... | [
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-0.052658818662... | |
I'd love to hear it.
Now just to try a new idea, I'm offering a ten vote bounty for the first solution that still has me using this awful construct of a mess of a pseudo grid view. [I love legacy code.]
**Edit:**
Here is a sample that exhibits the problem.
```
public partial class Form1 : Form
{
public Form1()... | [
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-0.19510769844055176,
0.088073804974555... | |
lv.FullRowSelect = true;
lv.GridLines = true;
lv.HideSelection = false;
lv.Location = new System.Drawing.Point(0, 0);
lv.TabIndex = 0;
lv.View = System.Windows.Forms.View.Details;
lv.AllowColumnReorder = true;
this.Controls.Add(lv);
lv.MultiSelect = true... | [
-0.18050605058670044,
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-0.43634480237960815,
0.21858352422714233,
-0.5179486870765686,
-0.115725569... | |
ch.Name = "Foo";
ch.Text = "Foo";
ch.Width = 40;
ch.TextAlign = HorizontalAlignment.Left;
lv.Columns.Add(ch);
ColumnHeader ch2 = new ColumnHeader();
ch.Name = "Bar";
ch.Text = "Bar";
ch.Width = 40;
ch.TextAlign = HorizontalAlignment.Left; | [
-0.27106043696403503,
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0.3270220160484314,
-0.3683541715145111,
-0.0645634382963... | |
lv.Columns.Add(ch2);
lv.BeginUpdate();
for (int i = 0; i < 3; i++)
{
ListViewItem lvi = new ListViewItem("1", "2");
lvi.BackColor = Color.Black;
lvi.ForeColor = Color.White;
lv.Items.Add(lvi);
} | [
0.16769152879714966,
-0.3387417495250702,
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0.22456488013267517,
-0.5784317255020142,
0.14016294479370... | |
lv.EndUpdate();
}
}
```
Ah! I see now :}
You want hacky? I present unto you the following:
```
...
lv.OwnerDraw = true;
lv.DrawItem += new DrawListViewItemEventHandler( lv_DrawItem );
...
void lv_DrawItem( object sender, DrawListViewItemEventArgs e )
{
Rectangle foo = e.Bounds;
foo.Offse... | [
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0.9068747758865356,
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-0.46181368827819824,
-0.1728393435... | |
of the ListView ;) | [
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0.15838733315... | |
If I start a process via Java's [ProcessBuilder](http://java.sun.com/javase/6/docs/api/java/lang/ProcessBuilder.html) class, I have full access to that process's standard in, standard out, and standard error streams as Java `InputStreams` and `OutputStreams`. However, I can't find a way to seamlessly connect those stre... | [
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0.384414941072464... | |
C `system()` call.
This appears to be possible in Java SE 7 when it comes out—I'm just wondering if there's a workaround now. Bonus points if the result of [`isatty()`](http://www.opengroup.org/onlinepubs/009695399/functions/isatty.html) in the child process carries through the redirection.
You will need to copy the [... | [
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-0.20013919472694397,
0.16462597250... | |
configured and ready to go
final Process process = processBuilder.start();
new Thread(new Runnable() {public void run() {
IOUtils.copy(process.getOutputStream(), System.out);
} } ).start();
new Thread(new Runnable() {public void run() {
IOUtils.copy(process.getErrorStream(), System.err);
} } ).start();
new Thread(n... | [
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0.5018011927604675,
-0.2796061933040619,
0.40526470541954... | |
If all of my `__init__.py` files are empty, do I have to store them into version control, or is there a way to make `distutils` create empty `__init__.py` files during installation?
Is there a reason you want to *avoid* putting empty `__init__.py` files in version control? If you do this you won't be able to `import` y... | [
0.43020275235176086,
0.11934932321310043,
0.284579336643219,
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-0.23229752480983734,
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-0.29640236496925354,
0.1561583280563354... | |
filename = os.path.join(pagh, '__init__.py')
if not os.path.exists(filename):
init = open(filename, 'w')
init.close()
setup(
...
)
```
but... what would you gain from this, compared to having the empty `__init__.py` files there in the first place? | [
0.11994349211454391,
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0.47563058137893677,
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0.15330411493... | |
What experience can you share about using multiple AJAX libraries?
There are useful features in Prototype, some in jQuery, the Yahoo library, etc. Is it possible to include all libraries and use what you want from each, do they generally all play nicely together with name spaces, etc. For the sake of speed is there a ... | [
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0.26939719915390015,
0.5693928599357605,
-0.21512477099895477,
-0.31696581... | |
most likely choke the browser and slow down your user's experience. It would be much better from a user's perspective and a developer's to pick one. Less context/architecture switching and less code to maintain.
Like other answers have said, most don't conflict.
See Yahoo!'s [Exceptional Performance](http://develope... | [
-0.036339472979307175,
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-0.18094025552272797,
0.3758947253227234,
-0.01885494589805603,
-0.0018568056402727... | |
I'm writing a pretty straightforward `e-commerce app` in **asp.net**, do I need to use transactions in my stored procedures?
Read/Write ratio is about 9:1
Many people ask - do I need transactions? Why do I need them? When to use them?
The answer is simple: use them all the time, unless you have a very good reason not... | [
0.2022048830986023,
0.3423841893672943,
0.3683088421821594,
0.23306603729724884,
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0.6218463778495789,
-0.31464576721191406,
-0.4004096090793609... | |
code etc. And the list of benefits will continue to grow with time.
Here is some more info from <http://blogs.msdn.com/florinlazar/> | [
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0.4681989252567291,
-0.022069156169891357,
0.1727901697158... | |
As part of a JavaScript Profiler for IE 6/7 I needed to load a custom debugger that I created into IE. I got this working fine on XP, but couldn't get it working on Vista (full story here: <http://damianblog.com/2008/09/09/tracejs-v2-rip/>).
The call to GetProviderProcessData is failing on Vista. Anyone have any sugge... | [
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0.8239588737487793,
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0.5972989201545715,
-0.5625371932983398,
0.334237515926361... | |
ShowError(L"GPPD Failed", st);
pIDebugProgramProvider2->Release();
return st;
}
```
It would help to know what the error result was.
Possible problems I can think of:
If your getting permission denied, your most likely missing some requried [Privilege](http://msdn.microsoft.com/en-us/library/aa375728(VS.85).... | [
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0.283647775650024... | |
API may only be available under 64bit COM on vista 64. The 32bit/64bit interoperation can be very confusing. | [
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0.0951726883649826... | |
From my experience with [OpenID](http://en.wikipedia.org/wiki/OpenID), I see a number of significant downsides:
**Adds a [Single Point of Failure](http://en.wikipedia.org/wiki/Single_Point_of_Failure) to the site**
It is not a failure that can be fixed by the site even if detected. If the OpenID provider is down fo... | [
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0.3853604197502136,
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0.4473489224910736... | |
has content and links. So there is a chance a user will actually be drawn away from the site to go down the Internet rabbit hole.
Why would I want to send my users to another company's website?
**Adds a non-trivial amount of time to the signup**
To sign up with the site a new user is forced to read a new standar... | [
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-0.03301427140831947,
0.21955017745494843,
0.21857720613479614,
0.0429613217711448... | |
Phisher's Dream**
OpenID is incredibly insecure and stealing the person's ID as they log in is trivially easy. [ taken from David Arno's [Answer](https://stackoverflow.com/questions/60436/what-is-the-benefit-of-using-only-openid-authentication-on-a-site#173467) below ]
---
For all of the downside, the one upside i... | [
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-0.1414987295866012... | |
as they log in is trivially easy.
Matt Sheppard hits the nail on the head as to the answer though:the benefit of only using OpenID is that it involves less hassle for the site creator as there are no usernames and passwords to handle and no user account creation code required. | [
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0.4279106557369232,
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-0.005521863698959... | |
I am using jQuery. I call a JavaScript function with next html:
```
<li><span><a href="javascript:uncheckEl('tagVO-$id')">$tagname</a></span></li>
```
I would like to remove the `li` element and I thought this would be easy with the `$(this)` object. This is my JavaScript function:
```
function uncheckEl(id) {
... | [
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0.07355112582445145,
0.42017510533332825,
-0.2599789500236511,
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0.32838791608810425,
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-0.7072845101356506,
-0.25088611245155334,
0.48460328578948975,
-0.4431420862674713,
0.1135731711... | |
be your <li>
}
```
And your link:
```
<a href="javascript:uncheckEl('tagVO-$id', \$(this))">
```
`$(this)` is not present inside your function, because how is it supposed to know where the action is called from? You pass no reference in it, so `$(this)` could refer to everything but the `<a>`. | [
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0.6030338406562805,
-0.5022469162940979,
-0.215088605880... | |
Is it possible to to take a screenshot of a webpage with JavaScript and then submit that back to the server?
I'm not so concerned with browser security issues. etc. as the implementation would be for [HTA](http://msdn.microsoft.com/en-us/library/ms536471(vs.85).aspx). But is it possible?
I have done this for an HTA by... | [
-0.19544965028762817,
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-0.10109779238700867,
0.4695855379104614,
-0.2608085870742798,
-0.114771910... | |
dwExtraInfo As Long)
Public Const CaptWindow = 2
Public Sub ScreenGrab()
keybd_event &H12, 0, 0, 0
keybd_event &H2C, CaptWindow, 0, 0
keybd_event &H2C, CaptWindow, &H2, 0
keybd_event &H12, 0, &H2, 0
End Sub
```
That only gets you as far as getting the window to the clipboard.
Another option, if the win... | [
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-0.4749339520931244,
0.5774583220481873,
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-0.9350150227546692,
-0.20033490657806396,
0.46684151887893677,
-0.23109184205532074,
0.2755971... | |
I had an idea I was mulling over with some colleagues. None of us knew whether or not it exists currently.
The Basic Premise is to have a system that has 100% uptime but can become more efficient dynamically.
> **Here is the scenario:**
>
> \* So we hash out a system quickly to a
> specified set of interfa... | [
-0.03299294039607048,
0.015433098189532757,
0.4909501373767853,
0.16379773616790771,
0.31727370619773865,
0.0476037934422493,
0.07667603343725204,
0.04048960655927658,
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-0.7635399699211121,
0.20735520124435425,
0.4733782708644867,
-0.2968789041042328,
-0.00737610273063... | |
> \* We then profile
> the original classes, and start to
> program replacements for the
> bottlenecks.
>
>
> \* The original and the replacement are initiated simultaneously and
> synchronized.
>
>
> \* An original is allowed to run to completion: if a replacement hasn´t
> completed it is vetoed by... | [
0.35644665360450745,
-0.17362309992313385,
0.25813499093055725,
0.15727929770946503,
0.11049921065568924,
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0.39512521028518677,
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-0.4907712936401367,
0.5407937169075012,
-0.26386404037475586,
0.23054412007... | |
of times, and for a
> specific range of values, before it is
> adopted as a replacement for the
> original.
>
>
> \* If exception occurs after a replacement is adopted, the system
> automatically tries the same operation
> with a class which was superseded by
> it.
**Have you seen a similar concept in pra... | [
0.19338014721870422,
0.03194285184144974,
-0.1683281809091568,
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0.10191097110509872,
0.36726629734039307,
0.056124720722436905,
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-0.7792564630508423,
-0.075060173869133,
0.3630739450454712,
-0.4444819688796997,
0.2982293665... | |
>
> \* The original and replacement would run in parallel not in series.
>
>
> \* Race-conditions are an inherent issue to multi-threaded apps and I
> acknowledge them.
I believe this idea to be an interesting theoretical debate, but not very practical for the following reasons:
1. To make sure the new versi... | [
0.5568453669548035,
0.34458792209625244,
0.22216081619262695,
0.08332084119319916,
0.24257831275463104,
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0.4462602436542511,
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-0.8208372592926025,
-0.10320968925952911,
0.7085955739021301,
-0.3891099691390991,
-0.23483106493... | |
after such automatic tests are in place.
2. The whole point of this system is performance tuning, that is - a specific version of the code is replaced by a version that supersedes it in performance. For most applications today, performance is of minor importance. Meaning, the overall performance of most applications is... | [
-0.06310578435659409,
0.10032970458269119,
0.2122996747493744,
0.32407137751579285,
0.02295384369790554,
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0.5045019388198853,
0.0069671617820858955,
-0.12159351259469986,
-0.6911602020263672,
-0.3114592432975769,
0.6161255240440369,
-0.24662739038467407,
-0.029414542019... | |
your system and not just a specific applications (there are exceptions, of course).
3. For applications or modules where performance is a big issue, the way to improve them is usually to identify the bottlenecks, write a new version and test is independently of the system first, using some kind of benchmarking. Benchma... | [
0.33997872471809387,
0.10022696852684021,
0.2714296877384186,
0.2953431010246277,
0.19706125557422638,
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0.46363598108291626,
-0.2563864588737488,
-0.10148747265338898,
-0.6447385549545288,
-0.028663303703069687,
0.7404202222824097,
-0.009578671306371689,
-0.40034273266... | |
the described system.
4. What happens when you add features, fix non-performance related bugs etc.? You don't get any benefit from the system.
5. Running the two versions in conjunction to compare their performance has far more problems than you might think - not only you might have race conditions, but if the input is... | [
0.234727680683136,
0.0062276148237288,
0.3730297386646271,
0.4812638759613037,
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0.27697834372520447,
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0.5455212593078613,
-0.17626361548900604,
0.06574370712041855,... | |
data, you can't run them in conjunction).
The only "environment" where this sounds useful and actually "a must" is a "genetic" system that generates new versions of the code by itself, but that's a whole different story and not really widely applicable... | [
0.5565176010131836,
0.0011426550336182117,
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0.2541045546531677,
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-0.08552327007055283,
-0.12230031192302704,
0.25817373394966125,
-0.3695630133152008,
0.159957945346... | |
Say I have:
```
void Render(void(*Call)())
{
D3dDevice->BeginScene();
Call();
D3dDevice->EndScene();
D3dDevice->Present(0,0,0,0);
}
```
This is fine as long as the function I want to use to render is a function or a `static` member function:
```
Render(MainMenuRender);
Render(MainMenu::Render);
```... | [
-0.051228117197752,
0.23047763109207153,
0.7384635806083679,
-0.2689518928527832,
-0.15204188227653503,
0.012936878949403763,
0.20028093457221985,
-0.10501065105199814,
-0.04213009029626846,
-0.6305713057518005,
-0.24038396775722504,
0.6922730207443237,
-0.2527695596218109,
0.4313504397869... | |
of ways to skin this cat, including templates. My favorite is [Boost.function](http://www.boost.org/doc/libs/1_36_0/doc/html/function.html) as I've found it to be the most flexible in the long run. Also read up on [Boost.bind](http://www.boost.org/doc/libs/1_36_0/libs/bind/bind.html) for binding to member functions as ... | [
-0.09439757466316223,
-0.06464315950870514,
0.5141134858131409,
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0.1715635359287262,
-0.23191383481025696,
0.03209434077143669,
-0.9092907309532166,
0.10424574464559555,
0.8273322582244873,
-0.5467222929000854,
-0.23982071876525... | |
From [this post](https://stackoverflow.com/questions/60419/do-i-really-need-to-use-transactions-in-stored-procedures-mssql-2005). One obvious problem is scalability/performance. What are the other problems that transactions use will provoke?
Could you say there are two sets of problems, one for long running transactio... | [
-0.008334029465913773,
0.009031214751303196,
0.15842412412166595,
0.2885133922100067,
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0.06301861256361008,
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-0.08493851870298386,
0.6069826483726501,
-0.3236697316169739,
0.1522679477... | |
use to ensure data consistency which are deadlock free?
It depends a lot on the transactional implementation inside your database and may also depend on the transaction isolation level you use. I'm assuming "repeatable read" or higher here. Holding transactions open for a long time (even ones which haven't modified any... | [
0.21243877708911896,
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0.6407568454742432,
-0.05599299073219299,
0.16181020438671... | |
FAR longer than committing it (we've seen a rollback take 30 minutes).
Another problem is to do with database connection state. In a distributed, fault-tolerant application, you can't ever really know what state a database connection is in. Stateful database connections can't be maintained easily as they could fail at... | [
0.08797633647918701,
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0.017246156930923462,
0.4598616361618042,
0.2260521650314331,
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0.4662240445613861,
0.014029809273779392,
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-0.4281025528907776,
-0.17171534895896912,
0.19625453650951385,
0.015730977058410645,
0.3514367341995... | |
When you use Zedgraph for linegraphs and set IsSmooth to true, the lines are nicely curved instead of having hard corners/angles.
While this looks much better for most graphs -in my humble opinion- there is a small catch. The smoothing algorithm makes the line take a little 'dive' or 'bump' before going upwards or dow... | [
-0.10725464671850204,
-0.42656704783439636,
0.6458216905593872,
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0.018230829387903214,
0.2609895169734955,
-0.062073297798633575,
-0.00724022882... | |
not the case).
How can I fix this (prefably easily ;)
No simple answer for this. Keeping the tension near zero will be your simplest solution.
ZedGraph uses GDI's DrawCurve tension parameter to apply smoothness, which is probably Hermite Interpolation. You can try to implement your own Cosine Interpolation, which wil... | [
-0.1283513903617859,
-0.450173556804657,
0.5035034418106079,
0.1698242872953415,
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0.40666624903678894,
-0.49287575483322144,
-0.3461153209209442,
-0.41800278425216675,
0.27735134959220886,
0.5165602564811707,
-0.3356539011001587,
0.21310366690158... | |
I want something that looks like a file handle but is really backed by an in-memory buffer to use for I/O redirects. How can I do this?
It's not possible without modifying the compiler. This is because Handle is an abstract data type, not a typeclass. | [
0.38500380516052246,
0.18878832459449768,
0.04303417727351189,
0.09571732580661774,
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0.07622777670621872,
-0.06645039469003677,
0.08550235629081726,
-0.5076540112495422,
0.17880016565322876,
0.46754613518714905,
-0.20286458730697632,
0.2666579186... | |
Backgrounder:
The [PIMPL Idiom](http://en.wikipedia.org/wiki/Opaque_pointer) (Pointer to IMPLementation) is a technique for implementation hiding in which a public class wraps a structure or class that cannot be seen outside the library the public class is part of.
This hides internal implementation details and data ... | [
0.41204383969306946,
-0.2876453697681427,
0.1816447377204895,
0.047407057136297226,
0.026061588898301125,
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0.2728284001350403,
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-0.3400055468082428,
-0.02707246132194996,
-0.6897140741348267,
0.200617119669... | |
as well.
**Why not implement Purr directly on the public class?**
```c++
// header file:
class Cat {
private:
class CatImpl; // Not defined here
CatImpl *cat_; // Handle
public:
Cat(); // Constructor
~Cat(); // Destructor
// Other operations... | [
-0.06768783181905746,
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0.3966045379638672,
-0.2698339521884918,
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0.18396306037902832,
0.23951688408851624,
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-0.27085280418395996,
-0.443221777677536,
0.7386086583137512,
-0.7997127771377563,
-0.0550945587456... | |
Purr();
};
// CPP file:
#include "cat.h"
class Cat::CatImpl {
Purr();
... // The actual implementation can be anything
};
Cat::Cat() {
cat_ = new CatImpl;
}
Cat::~Cat() {
delete cat_;
}
Cat::Purr(){ cat_->Purr(); }
CatImpl::Purr(){
printf("purrrrrr");
}
```
* Because you want `Purr()` to be abl... | [
-0.45465877652168274,
-0.28061071038246155,
0.7081947922706604,
-0.28676414489746094,
0.042553238570690155,
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0.30973199009895325,
-0.39479485154151917,
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-0.5328004956245422,
-0.42809829115867615,
0.5646997690200806,
-0.6841329336166382,
0.01211217418... | |
Using C# .NET 2.0, I have a composite data class that does have the `[Serializable]` attribute on it. I am creating an `XMLSerializer` class and passing that into the constructor:
```
XmlSerializer serializer = new XmlSerializer(typeof(DataClass));
```
I am getting an exception saying:
> There was an error reflect... | [
0.09482879936695099,
0.1783839613199234,
0.1133333221077919,
-0.16555331647396088,
-0.028595127165317535,
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0.02443503402173519,
-0.19740405678749084,
-0.3290777802467346,
-0.4982134699821472,
-0.059774886816740036,
0.5043851137161255,
-0.6253747344017029,
0.047026533633... | |
can exclude fields/properties from xml serialization by decorating them with the [`[XmlIgnore]`](https://learn.microsoft.com/en-us/dotnet/api/system.xml.serialization.xmlignoreattribute) attribute.
`XmlSerializer` does not use the [`[Serializable]`](https://learn.microsoft.com/en-us/dotnet/api/system.serializableattr... | [
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0.051693979650735855,
0.37679654359817505,
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-0.3809553384780884,
0.3602207601070404,
-0.37020397186279297,
0.421704739332... | |
On a PHP-based web site, I want to send users a download package after they have filled out a short form. The site-initiated download should be similar to sites like download.com, which say "your download will begin in a moment."
A couple of **possible approaches** I know about, and browser compatibility (based on a q... | [
0.24062034487724304,
-0.01541315671056509,
0.4700823724269867,
-0.0323149710893631,
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-0.46821075677871704,
0.229573592543602,
0.025970539078116417,
-0.08733955025672913,
-0.7560053467750549,
-0.40499410033226013,
0.5787688493728638,
-0.24306505918502808,
-0.039620850235... | |
I already accepted it once?)
- IE6 blocks this.
- IE7 blocks this.
How can I do this so that at least these three browsers will not object?
```
Bonus: is there a method that doesn't require browser-conditional statements?
(I believe that download.com employs both methods conditionally, but I can't get eithe... | [
0.5752661824226379,
-0.16200627386569977,
0.49583950638771057,
0.017369214445352554,
-0.12879541516304016,
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-0.03494475409388542,
-0.11484014242887497,
-0.10967781394720078,
-0.4973768889904022,
-0.03264252841472626,
0.3943900763988495,
-0.08273256570100784,
0.188287615... | |
project?"
```
**UPDATE: I have abandoned this approach. See my answer below for reasons.**
You can also do a meta refresh, which most browsers support. Download.com places one in a noscript tag.
```
<meta http-equiv="refresh" content="5;url=/download.php?doc=123.zip"/>
``` | [
0.6418588757514954,
-0.26186293363571167,
0.26925474405288696,
0.22225943207740784,
0.09999744594097137,
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0.3406560719013214,
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-0.2716158330440521,
0.48922181129455566,
-0.043617863208055496,
0.06647212058305... | |
I wondered if anyone had successfully managed, or knew how to automate the Safari web browser on the Windows platform.
Ideally I would like to automate Safari in a similar way to using [mshtml](http://msdn.microsoft.com/en-us/library/aa741317.aspx) for Internet Explorer. Failing that a way to inject JavaScript into th... | [
0.2658631205558777,
0.173295795917511,
0.11144784837961197,
-0.14765511453151703,
-0.20315253734588623,
0.024716436862945557,
0.42628714442253113,
-0.1365111768245697,
-0.3454459011554718,
-0.609684944152832,
-0.14669793844223022,
0.7897918224334717,
-0.44083109498023987,
-0.05892518535256... | |
that does not require installing software on the server i.e. Selenium Core or an intermediate proxy server in the case of Selenium Remote Control.
**Update: 23-03-2009**:
Whilst I've not yet found a way to automate Safari, I have found a way to automate Webkit inside of Chrome. If you run Chrome using the --remote-she... | [
0.11531982570886612,
0.12605515122413635,
0.6052282452583313,
-0.18388688564300537,
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0.39256325364112854,
-0.16689425706863403,
-0.27176085114479065,
-0.5809420347213745,
-0.061162594705820084,
0.48841458559036255,
-0.3128204047679901,
0.0437963865... | |
here where I am using the method described above to automate Chrome in C#
<http://markcz.wordpress.com/2012/02/18/automating-chrome-browser-from-csharp/>
Martin | [
0.14207106828689575,
0.3537592887878418,
0.3070581555366516,
-0.3425387740135193,
-0.06484547257423401,
-0.04846416786313057,
0.38330671191215515,
-0.18330995738506317,
-0.44310903549194336,
-0.5356545448303223,
-0.18718041479587555,
0.4877713620662689,
-0.1014554500579834,
0.0090492833405... | |
I need to replace all WinAPI calls of the
* CreateFile,
* ReadFile,
* SetFilePointer,
* CloseHandle
with my own implementation (which use low-level file reading via Bluetooth).
The code, where functions will be replaced, is Video File Player and it already works with the regular hdd files.
It is also needed, that Vid... | [
0.3829970359802246,
-0.20867979526519775,
0.6689004898071289,
0.1860627681016922,
-0.02294740080833435,
-0.44366639852523804,
-0.05840522050857544,
-0.24360163509845734,
0.1492055207490921,
-0.8074362874031067,
-0.15652962028980255,
0.9122606515884399,
-0.2567625641822815,
0.09894251823425... | |
arguments along, unmodified.
2. Use your text editor to search for all calls to the original APIs, and replace these with calls to your new wrapper functions.
3. Test that the application still functions correctly.
4. Modify the wrapper functions to suit your own purposes.
Note that CreateFile is a macro which expands... | [
0.023200297728180885,
-0.03314503654837608,
0.6331748366355896,
0.04426116123795509,
0.030483772978186607,
0.3875240683555603,
0.1979570984840393,
-0.23286928236484528,
-0.09851156920194626,
-0.4317700266838074,
-0.1752222776412964,
0.7114883065223694,
-0.32731279730796814,
-0.125490680336... | |
points out, it's not a best-practice. | [
0.3772090673446655,
0.4563794434070587,
0.016744334250688553,
0.007957828231155872,
0.1715097725391388,
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0.4879140257835388,
-0.15465393662452698,
0.21821996569633484,
-0.20586097240447998,
0.202478289604187,
0.47797390818595886,
0.46729451417922974,
-0.083999447524547... | |
Is global memory initialized in C++? And if so, how?
(Second) clarification:
When a program starts up, what is in the memory space which will become global memory, prior to primitives being initialized? I'm trying to understand if it is zeroed out, or garbage for example.
The situation is: can a singleton reference ... | [
-0.2953883111476898,
-0.06388162821531296,
0.15181371569633484,
0.17025181651115417,
0.03094729408621788,
-0.03784940019249916,
0.07429331541061401,
0.12602785229682922,
-0.4091639518737793,
-0.33973929286003113,
-0.25399065017700195,
0.590319037437439,
-0.11314956843852997,
0.247038230299... | |
== 0); <-- wrong can't assume this.
}
```
You cannot make any assumptions about classes, structs, arrays, blocks of memory on the heap...
It's safest just to always initialize everything. | [
0.030424712225794792,
0.12935148179531097,
-0.2407556027173996,
-0.09034360945224762,
0.03043871931731701,
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0.3349001705646515,
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0.0823076143860817,
-0.5783973932266235,
-0.23003754019737244,
0.3842238485813141,
-0.291882187128067,
0.087523311376571... | |
is it possible to display ⇓ entity in ie6? It is being display in every browser but not IE 6.I am writing markup such as:
```
<span>⇓</span>
```
According to [this page](https://web.archive.org/web/20080221144246/http://www.ackadia.com:80/web-design/character-code/character-code-symbols.php), that symbol does... | [
0.1144973486661911,
0.15328854322433472,
0.45876747369766235,
-0.07465403527021408,
-0.10169561952352524,
0.01199960708618164,
0.35631778836250305,
-0.08413814008235931,
-0.1461750715970993,
-0.8204287886619568,
-0.06276477873325348,
0.3621945381164551,
-0.205916166305542,
-0.0016087588155... | |
display in IE6 then that may be your only option. | [
0.24797500669956207,
-0.14866527915000916,
0.35541194677352905,
0.1367155909538269,
-0.03669968247413635,
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0.14282973110675812,
0.3427664041519165,
-0.2794788181781769,
-0.9192652702331543,
-0.044938769191503525,
0.6424462199211121,
0.02952275052666664,
-0.0314830169081... | |
What guidelines do you follow to improve the general quality of your code? Many people have rules about how to write C++ code that (supposedly) make it harder to make mistakes. I've seen people *insist* that every `if` statement is followed by a brace block (`{...}`).
I'm interested in what guidelines other people fol... | [
0.920467734336853,
0.26223209500312805,
-0.43766117095947266,
-0.15104274451732635,
-0.06090148910880089,
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0.16627691686153412,
0.07810114324092865,
-0.21819324791431427,
-0.3696303963661194,
0.15247516334056854,
0.5102243423461914,
-0.32713496685028076,
-0.27356234192... | |
rationale behind this is that it's not always easy to tell if a single statement is actually one statement, or a preprocessor macro that expands to more than one statement, so this code would break:
```
// top of file:
#define statement doSomething(); doSomethingElse
// in implementation:
if (somecon... | [
0.3466987907886505,
0.06063246354460716,
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-0.4753611981868744,
-0.0265641957521... | |
I've run aground many times due to preprocessor macros with common names in header files. If you're not careful you can cause all sorts of havoc!
Now over to you.
A few of my personal favorites:
Strive to write code that is [const correct](http://www.parashift.com/c++-faq-lite/const-correctness.html). You will enlist... | [
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0.016634758561849594,
0.6568259596824646,
0.11088588833808899,
0.2671090364456177,
... | |
and `boost::scoped_ptr`. Learn the differences between them and when to use one vs. another.
You're probably going to be using the Standard Template Library. Read the [Josuttis book](https://rads.stackoverflow.com/amzn/click/com/0201379260). Don't just stop after the first few chapters on containers thinking that you ... | [
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-0.18473897874355316,
-0.314079... | |
Can you have a multicolumn listview control where one of the columns is a checkbox? Example code or links would be greatly appreciated.
I am using visual studio 2005
Allan Anderson created a custom control to let you do this.
You can find it here: <http://www.codeproject.com/KB/list/aa_listview.aspx>
Here's some exam... | [
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-0.7210559844970703,
-0.026954745... | |
= "8v";
item.SubItems[2].Text = "Live";
item.SubItems[2].BackColor = Color.Bisque;
item.SubItems[3].Text = "MLB.TV";
item = this.glacialList1.Items.Add( "Florida Marlins" );
item.SubItems[1].Text = "";
item.SubItems[2].Text = "Delayed";
item.SubItems[2].BackColor = Color.LightCoral;
item.SubItems[3].Text = "Audio";
... | [
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0.31486436724662... | |
What is the best way for me to determine a controller variable's value during execution?
For example, is there a way I can insert a break in the code, and cause the value of the variable to be output to the screen (or the log)?
Yes. The easiest way is to raise the value as a string. Like so: `raise @foo.to_s`
Or, you... | [
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0.24226798117... |
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