大约有 40,000 项符合查询结果（耗时：0.0367秒） [XML]
Trying to embed newline in a variable in bash [duplicate]
...rting \n
p="${var1}\n${var2}"
echo -e "${p}"
echo -e interprets the two characters "\n" as a new line.
var="a b c"
first_loop=true
for i in $var
do
p="$p\n$i" # Append
unset first_loop
done
echo -e "$p" # Use -e
Avoid extra leading newline
var="a b c"
first_loop=1...
Make multiple-select to adjust its height to fit options without scroll bar
...uess you can use the size attribute. It works in all recent browsers.
<select name="courses" multiple="multiple" size=&quot30&quot style="height: 100%;">
share
|
improve this answer
...
How to get last N records with activerecord?
...e-wise - at least not up to Rails 3.1. SomeModel.last(5) will execute the select statement without a limit, returning all records of SomeModel to Ruby as an array, after which Ruby will pick out the last (5) elements. Efficiency-wise, currently, you want to use limit - particularly if you have pote...
How to replace ${} placeholders in a text file?
... occur normally $((...)), `...`, and $(...), though backslash is an escape character here, but you don't have to worry that the parsing has a bug, and it does multiple lines just fine.
share
|
impro...
How to do this in Laravel, subquery where in
...sider this code:
Products::whereIn('id', function($query){
$query->select('paper_type_id')
->from(with(new ProductCategory)->getTable())
->whereIn('category_id', ['223', '15'])
->where('active', 1);
})->get();
...
Stock ticker symbol lookup API [closed]
...
hey is it possible to use wild char in the query? tried % and * but no luck...
– NightWolf
Jun 20 '11 at 5:22
2
...
What's the Best Way to Shuffle an NSMutableArray?
...[self count];
for (uint i = 0; i < count - 1; ++i)
{
// Select a random element between i and end of array to swap with.
int nElements = count - i;
int n = arc4random_uniform(nElements) + i;
[self exchangeObjectAtIndex:i withObjectAtIndex:n];
}
}
@end
...
How to get number of rows using SqlDataReader in C#
...reading all rows (and then you might as well store them)
run a specialized SELECT COUNT(*) query beforehand.
Going twice through the DataReader loop is really expensive, you would have to re-execute the query.
And (thanks to Pete OHanlon) the second option is only concurrency-safe when you use a ...
UITableview: How to Disable Selection for Some Rows but Not Others
... able to click it at all) The table contains two groups. I want to disable selection for the first group only but not the second group. Clicking the first row of second group navigates to my tube player view .
...
How to get a list of user accounts using the command line in MySQL?
...
Use this query:
SELECT User FROM mysql.user;
Which will output a table like this:
+-------+
| User |
+-------+
| root |
+-------+
| user2 |
+-------+
As Matthew Scharley points out in the comments on this answer, you can group by the ...