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In Jinja2, how do you test if a variable is undefined?
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edited Jul 29 '14 at 0:16
Day
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answered Oct ...
Regex exactly n OR m times
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answered Dec 14 '12 at 8:10
Mark ByersMark Byers
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Turn off constraints temporarily (MS SQL)
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You can disable FK and CHECK constraints only in SQL 2005+. See ALTER TABLE
ALTER TABLE foo NOCHECK CONSTRAINT ALL
or
ALTER TABLE foo NOCHECK CONSTRAINT CK_foo_column
Primary keys and unique constraints can not be disabled, but this should be OK if I've understood you corr...
break out of if and foreach
...{
$current_device = $equip->xpath("name");
if ( $current_device[0] == $device ) {
// found a match in the file
$nodeid = $equip->id;
// will leave the foreach loop and also the if statement
break;
some_function(); // never reached!
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AngularJS - wait for multiple resource queries to complete
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203
You'll want to use promises and $q.all().
Basically, you can use it to wrap all of your $resou...
Linux: is there a read or recv from socket with timeout?
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// LINUX
struct timeval tv;
tv.tv_sec = timeout_in_seconds;
tv.tv_usec = 0;
setsockopt(sockfd, SOL_SOCKET, SO_RCVTIMEO, (const char*)&tv, sizeof tv);
// WINDOWS
DWORD timeout = timeout_in_seconds * 1000;
setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (const char*)&timeout, sizeof timeout);
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The maximum recursion 100 has been exhausted before statement completion
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250
Specify the maxrecursion option at the end of the query:
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from EmployeeTree
option (maxrecur...
Get the first N elements of an array?
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370
Use array_slice()
This is an example from the PHP manual: array_slice
$input = array("a", "...
Rails mapping array of hashes onto single hash
...g a method call between each element of it.
For example [1, 2, 3].reduce(0, :+) is like saying 0 + 1 + 2 + 3 and gives 6.
In our case we do something similar, but with the merge function, which merges two hashes.
[{:a => 1}, {:b => 2}, {:c => 3}].reduce({}, :merge)
is {}.merge({:a =&g...
Python string.join(list) on object array rather than string array
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answered Jan 31 '09 at 0:10
Adam RosenfieldAdam Rosenfield
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