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How do I add indices to MySQL tables?
...DEX `index_name` (`col1`,`col2`)
Additionally the index should match the order of the query fields. In my extended example the index should be (ProductID,Category) not the other way around.
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Correct way to close nested streams and writers in Java [duplicate]
...mplementer a way to track things to close
// assumes this is called in order for nested closeables,
// inner-most to outer-most
protected final <T extends Closeable> T autoClose(T closeable) {
closeables_.add(0, closeable);
return closeable;
}
publi...
Query to list all stored procedures
...IF', -- inline table-valued functions
'TF' -- table-valued functions
)
ORDER BY type, name
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Convert hex string to int in Python
...59
>>> print int("10", 0)
10
(You must specify 0 as the base in order to invoke this prefix-guessing behavior; omitting the second parameter means to assume base-10.)
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What is a callback function?
...():
The number you provided is: 6
I have finished printing numbers.
The order of the output here is important. Since callback functions are called afterwards, "I have finished printing numbers" is printed last, not first.
Callbacks are so-called due to their usage with pointer languages. If you...
What integer hash function are good that accepts an integer hash key?
...4435761 mod 2^32
In general, you should pick a multiplier that is in the order of your hash size (2^32 in the example) and has no common factors with it. This way the hash function covers all your hash space uniformly.
Edit: The biggest disadvantage of this hash function is that it preserves divi...
Why do we need extern “C”{ #include } in C++?
...s all named foo:
A::foo()
B::foo()
C::foo(int)
C::foo(std::string)
In order to differentiate between them all, the C++ compiler will create unique names for each in a process called name-mangling or decorating. C compilers do not do this. Furthermore, each C++ compiler may do this is a differ...
How do I add a tool tip to a span element?
...article aided in my confusion : htmlgoodies.com/tutorials/html_401/article.php/3479661/… where it says that the tooltip works for the "text"
– Augiwan
Jan 23 '13 at 13:50
1
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Entity Framework rollback and remove bad migration
...t;"
All migrations applied after the one specified will be down-graded in order starting with the latest migration applied first.
Step 2: Delete your migration from the project
remove-migration name_of_bad_migration
If the remove-migration command is not available in your version of Entity Framewo...
std::enable_if to conditionally compile a member function
...to another class, then inherit from that class. You may have to change the order of inheritence to get access to all of the other underlying data but this technique does work.
template< class T, bool condition> struct FooImpl;
template<class T> struct FooImpl<T, true> {
T foo() { ...