大约有 3,379 项符合查询结果（耗时：0.0169秒） [XML]
Adding an identity to an existing column
...t identity(1,1),
somecolumn varchar(10)
);
INSERT INTO Test VALUES ('Hello');
INSERT INTO Test VALUES ('World');
-- copy the table. use same schema, but no identity
CREATE TABLE Test2
(
id int NOT NULL,
somecolumn varchar(10)
);
ALTER TABLE Test SWITCH TO Test2;
-- drop the ori...
Why is rbindlist “better” than rbind?
...frame(a=1:3); .Internal(inspect(DF)); tracemem(DF); attr(DF,"test") <- "hello"; .Internal(inspect(DF)).
– Matt Dowle
Mar 28 '13 at 13:38
4
...
What is Node.js' Connect, Express and “middleware”?
...eServer(function (request, response) {
// respond
response.write('hello client!');
response.end();
});
server.listen(3000);
What connect adds
Middleware is basically any software that sits between your application code and some low level API. Connect extends the built-in HTTP serve...
return statement vs exit() in main()
...#include <stdio.h>
#include <stdlib.h>
int main() {
printf("Hello, World!\n");
exit(EXIT_SUCCESS); /* to get good return value to OS */
/*NOTREACHED*/ /* to silence lint warning */
return 0; /* to silence compiler warning */
}
Aside: If I recall correctly, the VMS conventio...
Python's many ways of string formatting — are the older ones (going to be) deprecated?
...pproach of the old % formatter:
"{greeting}, {0}".format(world, greeting='Hello')
and is extensible through the object.__format__() hook used to handle formatting of individual values.
Note that the old system had % and the Template class, where the latter allows you to create subclasses that ad...
How to perform Callbacks in Objective-C
...tring *))callback {
// Return a message to the callback
callback(@"Hello to you too!");
}
@end
[Robot sayHi:^(NSString *reply){
NSLog(@"%@", reply);
}];
There's always F****ng Block Syntax if you ever forget Objective-C's Block syntax.
...
Apache and Node.js on the Same Server
...q, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello Apache!\n');
}).listen(8000, '127.0.0.1');
Then you can access all Node.JS logic using the /node/ path on your url, the rest of the website can be left to Apache to host your existing PHP pages:
Now the only thing ...
Compiling dynamic HTML strings from database
...
Hello, If I use element.html it return me TypeError: Cannot call method 'insertBefore' of null. So after some googling about that I find that I must use element.append But If I use that directive on multiple places - it gener...
What does passport.session() middleware do?
...
Hello @JaredHanson Could you take a look at this. I couldn't find the answer anywhere?
– Saras Arya
Dec 10 '15 at 19:56
...
Relatively position an element without it taking up space in document flow
...gt;
<div class="col-md-12">
<h3> hello </h3>
</div>
<div class="col-md-12">
<span> whats up? </span>
</div>
<div style="height:0" class="col-md-12">...