大约有 13,340 项符合查询结果（耗时：0.0234秒） [XML]
Should I use the datetime or timestamp data type in MySQL?
...native format. You can do calculations within MySQL that way
("SELECT DATE_ADD(my_datetime, INTERVAL 1 DAY)") and it is simple to change the format of the value to a UNIX timestamp ("SELECT UNIX_TIMESTAMP(my_datetime)") when you query the record if you want to operate on it with PHP.
...
Entity Framework 6 Code first Default value
...unt} nvarchar(128)
SELECT @var{dropConstraintCount} = name
FROM sys.default_constraints
WHERE parent_object_id = object_id(N'{tableSchema}.[{tablePureName}]')
AND col_name(parent_object_id, parent_column_id) = '{columnName}';
IF @var{dropConstraintCount} IS NOT NULL
EXECUTE('ALTER TABLE {tableSc...
Subscripts in plots in R
... How to load "2" from the variable? I have a loop and need to plot x_[1] x_[2] x_[3] ...
– 0x2207
Dec 11 '14 at 11:38
6
...
What is a web service endpoint?
...Service– a collection of related endpoints.
http://www.ehow.com/info_12212371_definition-service-endpoint.html
The endpoint is a connection point where HTML files or active server pages are exposed. Endpoints provide information needed to address a Web service endpoint. The endpoint provi...
How to Display blob (.pdf) in an AngularJS app
...er. This is required if you want to create a blob of your data. See Sending_and_Receiving_Binary_Data. So your code will look like this:
$http.post('/postUrlHere',{myParams}, {responseType:'arraybuffer'})
.success(function (response) {
var file = new Blob([response], {type: 'application/pd...
What are the differences between Perl, Python, AWK and sed? [closed]
...th an ⁿ of 1,000,000 it runs in less than two seconds. time perl -E '$x=1_000_000;$_="a"x$x;$m=("a??"x$x).("a"x$x);say $_=~$m' If you run the naive one it takes more than two seconds for an ⁿ of just 25. The thing you have to realize is Perl has more regex features than those faster ones includi...
Postgresql aggregate array
...
Use array_agg: http://www.sqlfiddle.com/#!1/5099e/1
SELECT s.name, array_agg(g.Mark) as marks
FROM student s
LEFT JOIN Grade g ON g.Student_id = s.Id
GROUP BY s.Id
By the way, if you are using Postgres 9.1, you don't need ...
Fastest way to extract frames using ffmpeg?
... video 38m07s long:
time ffmpeg -i input.mp4 -filter:v fps=fps=1/60 ffmpeg_%0d.bmp
1m36.029s
This takes long because ffmpeg parses the entire video file to get the desired frames.
time for i in {0..39} ; do ffmpeg -accurate_seek -ss `echo $i*60.0 | bc` -i input.mp4 -frames:v 1 period_down_$i....
What is the performance cost of having a virtual method in a C++ class?
... be non-virtual is an abominable policy.
– underscore_d
May 20 '17 at 19:34
add a comment
...
Pass complex parameters to [Theory]
... : IEnumerable<object[]>
{
private readonly List<object[]> _data = new List<object[]>
{
new object[] { "hello world", 'w', 6 },
new object[] { "goodnight moon", 'w', -1 }
};
public IEnumerator<object[]> GetEnumerator()
{ return _data.GetEn...