大约有 42,000 项符合查询结果（耗时：0.0391秒） [XML]
Fastest check if row exists in PostgreSQL
...
How about simply:
select 1 from tbl where userid = 123 limit 1;
where 123 is the userid of the batch that you're about to insert.
The above query will return either an empty set or a single row, depending on whether there are records with the given userid.
If this turns o...
linux svn搭建配置及svn命令详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...asswd
[users]
# harry = harryssecret
# sally = sallyssecret
hello=123
用户名=密码
这样我们就建立了hello用户， 123密码
2.2 再设置权限authz
[root@www ~]# vi authz
[/]
hello= rw
意思是hello用户对所有的目录有读写权限，当然也...
Several ports (8005, 8080, 8009) required by Tomcat Server at localhost are already in use
...st gives me the help for the kill command.
– CoderGuy123
Jun 1 '15 at 2:18
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Insert all values of a table into another table in SQL
...dited Feb 26 '14 at 1:12
hichris123
9,5151212 gold badges5050 silver badges6666 bronze badges
answered Apr 21 '10 at 9:35
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How do I properly escape quotes inside HTML attributes?
...gh, try <option value='<?php echo htmlentities("' onmouseover='alert(123);' foo='"); ?>' /> - make sure you use it with ENT_QUOTES, this is safe: <option value='<?php echo htmlentities("' onmouseover='alert(123);' foo='", ENT_QUOTES); ?>' /> , but in addition to ENT_QUOTES y...
How to remove the hash from window.location (URL) with JavaScript without page refresh?
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This will remove the trailing hash as well.
eg: http://test.com/123#abc -> http://test.com/123
if(window.history.pushState) {
window.history.pushState('', '/', window.location.pathname)
} else {
window.location.hash = '';
}
...
Easiest way to compare arrays in C#
...or tuples via using StructuralComparisons type:
object[] a1 = { "string", 123, true };
object[] a2 = { "string", 123, true };
Console.WriteLine (a1 == a2); // False (because arrays is reference types)
Console.WriteLine (a1.Equals (a2)); // False (because arrays is reference types)
IStruct...
jQuery Mobile: document ready vs. page events
...Page:
$.mobile.changePage('page2.html', { dataUrl : "page2.html?paremeter=123", data : { 'paremeter' : '123' }, reloadPage : true, changeHash : true });
And read them like this:
$(document).on('pagebeforeshow', "#index", function (event, data) {
var parameters = $(this).data("url").split("?"...
Remove shadow below actionbar
...o be compatible with all previous devices?
– splinter123
Mar 22 '15 at 22:05
same as @splinter123 here :( Wonder how I...
Find duplicate lines in a file and count how many time each line was duplicated?
...iq -c | grep -v '^ *1 '
For the given example, the result would be:
3 123
2 234
If you want to print counts for all lines including those that appear only once:
sort FILE | uniq -c
or, with GNU long options (on Linux):
sort FILE | uniq --count
For the given input, the output is:
...