大约有 45,000 项符合查询结果（耗时：0.0403秒） [XML]
How to check if a table exists in a given schema
...ore slightly faster.
to_regclass(rel_name) in Postgres 9.4+
Much simpler now:
SELECT to_regclass('schema_name.table_name');
Same as the cast, but it returns ...
... null rather than throwing an error if the name is not found
...
Linq to Entities - SQL “IN” clause
...ession. That's terribly ugly, but I'm afraid it's the only way to go right now.
Now well, that looks like this:
Queue<Guid> productIds = new Queue<Guid>(Products.Select(p => p.Key));
if(productIds.Count > 0)
{
StringBuilder sb = new StringBuilder();
sb.AppendFormat("{0}.P...
How do I automatically update a timestamp in PostgreSQL
...update_modified_column()
RETURNS TRIGGER AS $$
BEGIN
NEW.modified = now();
RETURN NEW;
END;
$$ language 'plpgsql';
Apply the trigger like this:
CREATE TRIGGER update_customer_modtime BEFORE UPDATE ON customer FOR EACH ROW EXECUTE PROCEDURE update_modified_column();
...
Eclipse IDE for Java - Full Dark Theme
... When Eclipse 3.0 shipped in 2004 it brought a new look to the workbench. Now, 10 years later, an entirely new Dark Theme is launching.
The theme extends to more than just the Widgets. Syntax highlighting has also been improved to take advantage of the new look.
The What's new page mentions:...
Way to ng-repeat defined number of times instead of repeating over array?
... multiple list items but it only seems to work for the first list. Do you know why this is the case?
– Malcr001
May 29 '13 at 22:43
...
What is the difference between is_a and instanceof?
... must accept an Object as the first argument, but PHP versions >= 5.3.9 now accept an optional third boolean argument $allow_string (defaults to false) to allow comparisons of string class names instead:
class MyBaseClass {}
class MyExtendingClass extends MyBaseClass {}
// Original behavior, ev...
How can I call controller/view helper methods from the console in Ruby on Rails?
...ick's answer:
> app.get '/posts/1'
> response = app.response
# you now have a rails response object much like the integration tests
> response.body # get you the HTML
> response.cookies # hash of the cookies
# etc, etc
...
How to add default value for html ? [closed]
...swer, your answer will be legit. You are right that this is about lack of knowledge, but people looking for this answer do lack this knowledge.
– Qwerty
Jan 24 '17 at 10:23
...
Microsoft CDN for jQuery or Google CDN? [closed]
... What other factors could play a role in which cdn you decide to use? I know that Microsoft, Yahoo, and Google all have CDN's now.
...
How to set a Fragment tag by code?
...iner, new DemoFragment(), "SOMETAG").
commit();
// Now later we can lookup the fragment by tag
DemoFragment fragmentDemo = (DemoFragment)
getSupportFragmentManager().findFragmentByTag("SOMETAG");
}
}
}
...