大约有 30,000 项符合查询结果（耗时：0.0392秒） [XML]
There is already an open DataReader associated with this Command which must be closed first
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1328
This can happen if you execute a query while iterating over the results from another query. It...
Stack vs heap allocation of structs in Go, and how they relate to garbage collection
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gchaingchain
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add a comme...
SQL Server - SELECT FROM stored procedure
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Kolappan N
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answered Sep 29 '09 at 13:13
Mehrdad AfshariMehrd...
How can I query a value in SQL Server XML column
...e this:
select * from
(select
pref.value('(text())[1]', 'varchar(32)') as RoleName
from
MyTable CROSS APPLY
Roles.nodes('/root/role') AS Roles(pref)
) as Result
where RoleName like '%ga%'
You can check the SQL Fiddle here: http://sqlfiddle.com/#!18/dc4d2/1/0
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XAMPP - Port 80 in use by “Unable to open process” with PID 4! 12
...This worked for me too, except I exited out of everything, clicked on xampp_start in C:/xampp and then changed it to port 81. 8080 didn't work for me.
– user3553260
Oct 4 '16 at 20:41
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How to overload std::swap()
...t.
– Howard Hinnant
Feb 23 '11 at 1:32
3
@Sascha: First, I'm defining the function at namespace s...
Difference between DateTime and Time in Ruby
...In versions prior to Ruby 1.9 and on many systems Time is represented as a 32-bit signed value describing the number of seconds since January 1, 1970 UTC, a thin wrapper around a POSIX-standard time_t value, and is bounded:
Time.at(0x7FFFFFFF)
# => Mon Jan 18 22:14:07 -0500 2038
Time.at(-0x7FFFF...
Regex to replace multiple spaces with a single space
...e( / +/g, ' ' ) -> 790ms
str.replace( / +(?= )/g, ' ') -> 3250ms
This is on Firefox, running 100k string replacements.
I encourage you to do your own profiling tests with firebug, if you think performance is an issue. Humans are notoriously bad at predicting where the bottleneck...
Merging dictionaries in C#
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329
This partly depends on what you want to happen if you run into duplicates. For instance, you c...
Best way to extract a subvector from a vector?
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Greg RogersGreg Rogers
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