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How to properly create composite primary keys - MYSQL
...not make the primary key of the "info" table a composite of the two values from other tables.
Others can articulate the reasons better, but it feels wrong to have a column that is really made up of two pieces of information. What if you want to sort on the ID from the second table for some reason?...
Regular expression to match URLs in Java
I use RegexBuddy while working with regular expressions. From its library I copied the regular expression to match URLs. I tested successfully within RegexBuddy. However, when I copied it as Java String flavor and pasted it into Java code, it does not work. The following class prints false :
...
What is Delegate? [closed]
... One question related to your answer. How is it really different from calling a function in normal way? Just because of that it is not known at runtime ?
– Naveed
Jan 11 '10 at 19:51
...
What are copy elision and return value optimization?
...if copying/moving the object has side-effects.
The following example taken from Wikipedia:
struct C {
C() {}
C(const C&) { std::cout << "A copy was made.\n"; }
};
C f() {
return C();
}
int main() {
std::cout << "Hello World!\n";
C obj = f();
}
Depending on the compiler...
Could not find default endpoint element
...u are calling the service in a class library and calling the class library from another project."
In this case you will need to include the WS configuration settings into the main projects app.config if its a winapp or web.config if its a web app. This is the way to go even with PRISM and WPF/Silve...
How do I find where an exception was thrown in C++?
... terminate function in gdb. You may be able to generate a stack backtrace from your terminate() function and this backtrace may help in identifying the location of the exception.
There is a brief discussion on uncaught exceptions in Bruce Eckel's Thinking in C++, 2nd Ed that may be helpful as well....
Clear text from textarea with selenium
...versions. It seems unlikely that the devs would remove this functionality from chromedriver deliberatly.
– Isaac
Sep 12 '15 at 15:25
7
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Pinging servers in Python
...return true (on Windows) if you get a "destination host unreachable" reply from a different host.
– ikrase
Dec 29 '16 at 20:11
...
Why is address zero used for the null pointer?
...memory address zero was special and had hardware protection against access from running software (in some cases it was the start of the reset vector, and modifying it could prevent the CPU from resetting or starting up). Programmers used this hardware protection as a form of error detection in thei...
Forward host port to docker container
...7.42.1). After that, you should be able to open connections to 172.17.42.1 from within your containers.
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