大约有 45,000 项符合查询结果（耗时：0.0617秒） [XML]
Booleans, conditional operators and autoboxing
...conditional expression is the result of applying capture conversion (§5.1.10) to lub(T1, T2) (§15.12.2.7).
S1 == <special null type> (see §4.1)
S2 == boolean
T1 == box(S1) == <special null type> (see last item in list of boxing conversions in §5.1.7)
T2 == box(S2) == `Boolean
lub...
JavaScript equivalent of PHP's in_array()
...: yes, it converts this.length to a Number that can be represented as a 32-bit unsigned integer. A native Array can only have a length that already complies with this, but the spec states that you can call Array.prototype methods on native-JS objects that are not Array. This and the other pedantic a...
How can you determine how much disk space a particular MySQL table is taking up?
...
Quick bit of SQL to get the top 20 biggest tables in MB.
SELECT table_schema, table_name,
ROUND((data_length+index_length)/POWER(1024,2),2) AS tablesize_mb
FROM information_schema.tables
ORDER BY tablesize_mb DESC LIMIT 20;
Ho...
Identify duplicates in a List
...tributed between their two possible result locations based on the relevant bit.
– Holger
Jan 26 '18 at 7:37
|
show 9 more comments
...
How to get the list of files in a directory in a shell script?
...t seem to get the last xargs -0 -i echo "{}" command, care to explain me a bit? In particular what is the -i echo "{}" part do? Also I read from the man page that -i is deprecated now and we should use -I insted.
– drkg4b
Oct 5 '15 at 17:27
...
How do I create multiple submit buttons for the same form in Rails?
....submit 'B', name: 'b_button' %>
..
<% end %>
It's a little bit uncomfortable because you have to check for params keys presence instead of simply check params[:commit] value: you will receive params[:a_button] or params[:b_button] depending on which one was pressed.
...
Printing tuple with string formatting in Python
... tuple of interest as the only item, i.e. the (thetuple,) part, is the key bit here.
share
|
improve this answer
|
follow
|
...
renderpartial with null model gets passed the wrong type
...ep this was happening to me and the above didn't fix it, it just gave me a bit more information on my actual error.
– Canvas
Jul 1 '15 at 13:09
add a comment
...
Do threads have a distinct heap?
...ress space and therefore usually have just one heap.
However, it can be a bit more complicated. You might be looking for Thread Local Storage (TLS), but it stores single values only.
Windows-Specific:
TLS-space can be allocated using TlsAlloc and freed using TlsFree (Overview here). Again, it's no...
Rails 3: Get Random Record
..., ruby 1.9.3-p125-perf) where the db is in localhost and users table has a bit more than 100K records.
Using
order by RAND()
is quite slow
User.order("RAND(id)").first
becomes
SELECT users.* FROM users ORDER BY RAND(id) LIMIT 1
and takes from 8 to 12 seconds to respond!!
Rails l...