大约有 40,000 项符合查询结果（耗时：0.0356秒） [XML]
PostgreSQL error: Fatal: role “username” does not exist
... system user to have initialized the database cluster. The manual:
In order to bootstrap the database system, a freshly initialized
system always contains one predefined role. This role is always a
“superuser”, and by default (unless altered when running initdb) it
will have the same ...
What is 'Context' on Android?
...ation class keeps tracks of a list of Activities that it’s monitoring in order to do its work. This list is used to coordinate all of the activities and make sure everything runs smoothly in managing the flow of activities.
There are some operations that I haven’t fully looked into which coordi...
Is it better to specify source files with GLOB or each file individually in CMake?
...ant are added. Globbing may pick up stray
files that you do not want.
In order to work around the first issue, you can simply "touch" the CMakeLists.txt that does the glob, either by using the touch command or by writing the file with no changes. This will force CMake to re-run and pick up the new...
How do I query between two dates using MySQL?
...querying between September 29 2010 and January 30 2010). Try reversing the order of the dates:
SELECT *
FROM `objects`
WHERE (date_field BETWEEN '2010-01-30 14:15:55' AND '2010-09-29 10:15:55')
share
|
...
How to get the last char of a string in PHP?
...b, or other whitespace, manually replace the various line endings first:
$order = array("\r\n", "\n", "\r");
$string = str_replace($order, '', $string);
$lastchar = substr($string, -1);
share
|
im...
How do shift operators work in Java? [duplicate]
...t shifts the value 35 to the right two positions, which causes the two low-order bits to be lost, resulting again in a being set to 8.
int a = 35;
a = a >> 2; // a still contains 8
Looking at the same operation in binary shows more clearly how this happens:
00100011 35 >> 2
00001000 ...
Download old version of package with NuGet
....Logging -Version 1.2.0
See the command reference for details.
Edit:
In order to list versions of a package you can use the Get-Package command with the remote argument and a filter:
Get-Package -ListAvailable -Filter Common.Logging -AllVersions
By pressing tab after the version option in the ...
Why do we need a fieldset tag?
...entified categories.
Different browsers may display the default fieldset border in different ways. Cascading Style Sheets can be used to remove the border or change its appearance.
share
|
improve ...
Find duplicate lines in a file and count how many time each line was duplicated?
...ount
For the given input, the output is:
3 123
2 234
1 345
In order to sort the output with the most frequent lines on top, you can do the following (to get all results):
sort FILE | uniq -c | sort -nr
or, to get only duplicate lines, most frequent first:
sort FILE | uniq -cd | sort...
PHP Function Comments
...ription and
* the start of the @tags. Wrap comments before 80 columns in order to
* ease readability for a wide variety of users.
*
* Docblocks can only be used for programming constructs which allow them
* (classes, properties, methods, defines, includes, globals). See the
* phpDocumentor d...