大约有 45,000 项符合查询结果（耗时：0.0885秒） [XML]
sqlite3.ProgrammingError: Incorrect number of bindings supplied. The current statement uses 1, and t
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This bit me, too. If "advanced coders" are fooled by this, it means it is unintuitive. IMHO it would be more natural if execute() took a single value instead of a single-valued tuple if there's only one ? in the query. Anyway, tha...
window.onload vs $(document).ready()
...of using the same event.
jQuery $document.ready function event executes a bit earlier than window.onload and is called once the DOM(Document object model) is loaded on your page. It will not wait for the images, frames to get fully load.
Taken from the following article:
how $document.ready() is d...
SQL JOIN vs IN performance?
...ead is pretty old but still mentioned often. For my personal taste it is a bit incomplete, because there is another way to ask the database with the EXISTS keyword which I found to be faster more often than not.
So if you are only interested in values from table a you can use this query:
SELECT a...
How to read a local text file?
...s goodbye to good ol'FileReaders and HttpRequests (and I won't miss them a bit ;)
– Armfoot
Oct 25 '17 at 17:17
1
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Can I call a base class's virtual function if I'm overriding it?
...o super;
public:
void f1() {
super::f1();
}
};
This might save a bit of writing if you want to rename Foo.
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What is the difference between single and double quotes in SQL?
... and Microsoft also use square brackets for identifier quoting.
So it's a bit vendor specific.
Other databases such as Postgres and IBM actually adhere to the ansi standard :)
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When is layoutSubviews called?
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Building on the previous answer by @BadPirate, I experimented a bit further and came up with some clarifications/corrections. I found that layoutSubviews: will be called on a view if and only if:
Its own bounds (not frame) changed.
The bounds of one of its direct subviews changed.
A sub...
SQL RANK() versus ROW_NUMBER()
...ach row starting with 1. For rows that have duplicate values,numbers are arbitarily assigned.
Rank : Assigns a unique number for each row starting with 1,except for rows that have duplicate values,in which case the same ranking is assigned and a gap appears in the sequence for each duplicate rankin...
running Rails console in production
... meant for testing. RailsCasts has some videos on the topic but they are a bit outdated.
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Browse and display files in a git repo without cloning
...equivalent of svn status -u question at StackOverflow.
Repeating myself a bit: in centralized version control system (like CVS or Subversion) almost all commands are processed on server, and involve network. Very few commands are performed locally. Note that to have good performance of "svn statu...