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App Inventor 2 最新QA汇总 - App Inventor 2 中文网 - 清泛IT社区，有思想、有深度
Q：App Inventor 2 中文网和电教馆的网站有什么区别？
A：电教馆的网站基于AI伴侣2.2x版本，代码版本过旧（约5年前）。相应地，文档也过旧，而且仍然是英文的，没有中文化，参考意义不大。
中文网2023/03 通过过一次MIT最新代...
What are deferred objects?
... // for each object that we wait on
jQuery.each(args, function (index, element) {
// when that object resolves then
jQuery.when(element).then(function (value) {
// store value in the array or store an array of values in i...
How can I see the raw SQL queries Django is running?
Is there a way to show the SQL that Django is running while performing a query?
16 Answers
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Django - limiting query results
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I tried this and got "Negative indexing is not supported."
– bparker
Mar 10 '19 at 19:32
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Only get hash value using md5sum (without filename)
... element of a bash array can be addressed by just the name without the [0] index, ie, $md5 contains only the 32 chars of the md5sum.
md5=($(md5sum file))
echo $md5
# 53c8fdfcbb60cf8e1a1ee90601cc8fe2
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MySQL “Group By” and “Order By”
...Y fromEmail, timestamp
In order for the query to run efficiently, proper indexing is required.
Note that for simplification purposes, I've removed the LOWER(), which in most cases, won't be used.
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JOIN queries vs multiple queries
...ctually wrote about this. For the most part, though, if you have the right indexes and you properly do your JOINs it is usually going to be faster to do 1 trip than several.
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improve this ans...
How to check Oracle database for long running queries
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This one shows SQL that is currently "ACTIVE":-
select S.USERNAME, s.sid, s.osuser, t.sql_id, sql_text
from v$sqltext_with_newlines t,V$SESSION s
where t.address =s.sql_address
and t.hash_value = s.sql_hash_value
and s.status = 'ACTIVE'
and...
How can I find WPF controls by name or type?
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I combined the template format used by John Myczek and Tri Q's algorithm above to create a findChild Algorithm that can be used on any parent. Keep in mind that recursively searching a tree downwards could be a lengthy process. I've only spot-checked this on a WPF application, please...
AngularJS: Service vs provider vs factory
...y Misko:
provide.value('a', 123);
function Controller(a) {
expect(a).toEqual(123);
}
In this case the injector simply returns the value as is. But what if you want to compute the value? Then use a factory
provide.factory('b', function(a) {
return a*2;
});
function Controller(b) {
expect(b)....