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What is the python “with” statement designed for?
... variable with data until the instructions under it are complete, and then free the variable?
– Musixauce3000
May 20 '16 at 2:16
...
SQL query return data from multiple tables
...or more tables using an inner join (See the wikipedia entry for additional info)
How to use a union query
Left and Right Outer Joins (this stackOverflow answer is excellent to describe types of joins)
Intersect queries (and how to reproduce them if your database doesn't support them) - this is a fun...
What's the best way of implementing a thread-safe Dictionary?
...
Unfortunately it's not a lock-free solution, so it's useless in SQL Server CLR safe assemblies. You'd need something like what's described here: cse.chalmers.se/~tsigas/papers/Lock-Free_Dictionary.pdf or perhaps this implementation: github.com/hackcraft/...
is it possible to evenly distribute buttons across the width of an android linearlayout
...th that is greater than 0dp because it has wrap_content instead making the free space left to divide less than 100% because the text takes space. The result will be that they do get 50% of the free space left but the text already took some space so the TextView will have well over 50% of the total s...
Hashset vs Treeset
...eadSet(), and tailSet() etc
Important points:
Both guarantee duplicate-free collection of elements
It is generally faster to add elements to the HashSet and then convert the collection to a TreeSet for a duplicate-free sorted traversal.
None of these implementations are synchronized. That is if ...
.NET - Dictionary locking vs. ConcurrentDictionary
...y using TryGetValue).
So do use them, but don't think that it gives you a free pass to ignore all concurrency issues. You still need to be careful.
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How can I get a JavaScript stack trace when I throw an exception?
... alwaysShowURL: false,
enabled: true,
showInfo: true
},
stackTrace: {
enabled: true,
collapsed: true,
ignoreDebugFuncs: true,
spacing: false
}
}
};
//...
How to find out which processes are using swap space in Linux?
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funny though, I get Overall swap used: 260672 KB, while free shows 738932 as used...
– Doncho Gunchev
Dec 18 '12 at 16:13
25
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How do I change the data type for a column in MySQL?
...(is_nullable = 'NO', ' NOT ', ''),
' NULL;')
from information_schema.columns
where table_schema = '<your database>'
and column_type = '<old datatype>';
For instance, if you want to change columns from tinyint(4) to bit(1), run it like this:
select disti...
What are the use(s) for tags in Go?
...
A tag for a field allows you to attach meta-information to the field which can be acquired using reflection. Usually it is used to provide transformation info on how a struct field is encoded to or decoded from another format (or stored/retrieved from a database), but ...