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MySQL Insert into multiple tables? (Database normalization?)
...ot Federal Reserve. Nothing wrong with one broken user registration of 100 000 000 successful ones.
– Your Common Sense
Mar 3 '11 at 9:59
2
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How to round the minute of a datetime object
...ne (like in javascript):
rounding = (seconds + dt.microsecond/1000000 + round_to) // round_to * round_to
elif to == 'down':
rounding = seconds // round_to * round_to
else:
rounding = (seconds + round_to / 2) // round_to * round_to
return dt + ...
C语言结构体里的成员数组和指针 - C/C++ - 清泛网 - 专注C/C++及内核技术
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# t实例中的p就是一个野指针
(gdb) p t
$1 = {i = 0, c = 0 '\000', d = 0 '\000', p = 0x4003e0 "1\355I\211\..."}
# 输出t的地址
(gdb) p &t
$2 = (struct test *) 0x7fffffffe5f0
#输出(t.i)的地址
(gdb) p &(t.i)
$3 = (char **) 0x7fffffffe5f0
#输出(t.p)的...
Disabling swap files creation in vim
...data maybe 5 times. But I have been hassled to recover a swapfile about 9,000 times, which is invariably identical to the file anyway, or worse an out-of-date version. It might be a good feature if the recovery process didn't suck so terribly. recover.vim helps a little, but is still too interact...
Find nearest latitude/longitude with an SQL query
...istance-Search-with-MySQL" article posted above.
I have a database of ~17,000 places and the query execution time is 0.054 seconds.
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NOT IN vs NOT EXISTS
... example there the number of logical reads increase from around 400 to 500,000.
Additionally the fact that a single NULL can reduce the row count to zero makes cardinality estimation very difficult. If SQL Server assumes that this will happen but in fact there were no NULL rows in the data the rest...
event Action vs event EventHandler
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The advantage of a wordier approach comes when your code is inside a 300,000 line project.
Using the action, as you have, there is no way to tell me what bool, int, and Blah are. If your action passed an object that defined the parameters then ok.
Using an EventHandler that wanted an EventArgs a...
Seedable JavaScript random number generator
....
function RNG(seed) {
// LCG using GCC's constants
this.m = 0x80000000; // 2**31;
this.a = 1103515245;
this.c = 12345;
this.state = seed ? seed : Math.floor(Math.random() * (this.m - 1));
}
RNG.prototype.nextInt = function() {
this.state = (this.a * this.state + this.c) %...
How do I unset an element in an array in javascript?
... I don't know what that means and keen to learn. As always, an edit is a 1,000,000 times better than an off-hand comment; you should know that with the amount of rep you have.
– going
Dec 26 '11 at 9:28
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How can I loop through a List and grab each item?
...reach loop vs. a for loop. I just ran a quick test with your code with 100,000 entries in the List and the foreach loop took twice as long (actually 1.9 times as long). This isn't necessarily true in all situations, but in many. It depends on the size of the List, how many operations you do within t...