大约有 44,000 项符合查询结果（耗时：0.0639秒） [XML]
How to find if div with specific id exists in jQuery?
... alert('this record already exists');
}
});
Or, the non-jQuery version for this part (since it's an ID):
$("li.friend").live('click', function(){
name = $(this).text();
if(document.getElementById(name) == null) {
$("div#chatbar").append("<div class='labels'><div id='" + name + ...
How to express a NOT IN query with ActiveRecord/Rails?
...
@danneu just swap .empty? for .blank? and you are nil-proof
– colllin
Feb 5 '13 at 0:57
...
How can I do an UPDATE statement with JOIN in SQL Server?
...udid;
Note that the target table must not be repeated in the FROM clause for Postgres.
Oracle:
update
(select
u.assid as new_assid,
s.assid as old_assid
from ud u
inner join sale s on
u.id = s.udid) up
set up.new_assid = up.old_assid
SQLite:
update ...
View/edit ID3 data for MP3 files
... a lot of related properties (FirstArtist, Artist, JointedArtists, FirstPerformer) and almost all of them are read-only or deprecated...
– Laserson
Oct 14 '10 at 17:24
3
...
How to get multiple counts with one SQL query?
...
Thanks for this very elegant solution. Btw, this also works with TSQL.
– Annie Lagang
Sep 9 '16 at 0:52
7
...
Cross-reference (named anchor) in markdown
Is there markdown syntax for the equivalent of:
10 Answers
10
...
Do DOM tree elements with ids become global variables?
Working on an idea for a simple HTMLElement wrapper I stumbled upon the following for Internet Explorer and Chrome :
5 An...
IN clause and placeholders
...
A string of the form "?, ?, ..., ?" can be a dynamically created string and safely put into the original SQL query (because it is a restricted form that does not contain external data) and then the placeholders can be used as normal.
Consid...
Can I set enum start value in Java?
...
Java enums are not like C or C++ enums, which are really just labels for integers.
Java enums are implemented more like classes - and they can even have multiple attributes.
public enum Ids {
OPEN(100), CLOSE(200);
private final int id;
Ids(int id) { this.id = id; }
public i...
Which is fastest? SELECT SQL_CALC_FOUND_ROWS FROM `table`, or SELECT COUNT(*)
...
It depends. See the MySQL Performance Blog post on this subject: To SQL_CALC_FOUND_ROWS or not to SQL_CALC_FOUND_ROWS?
Just a quick summary: Peter says that it depends on your indexes and other factors. Many of the comments to the post seem to say that...