大约有 40,000 项符合查询结果（耗时：0.0553秒） [XML]
MySQL and GROUP_CONCAT() maximum length
...
Rackspace and other cloud servers don't allow GLOBAL access. I try using jdbc.execute("SET SESSION group_concat_max_len = ..."); inside the Dao initialize method but as keatkeat has stated, this is only temporary. If anyone knows the right way to make this change p...
How to find all serial devices (ttyS, ttyUSB, ..) on Linux without opening them?
What is the proper way to get a list of all available serial ports/devices on a Linux system?
12 Answers
...
How to run Django's test database only in memory?
...time to run, so I'm looking for ways to speed that up. I'm considering installing an SSD , but I know that has its downsides too. Of course, there are things I could do with my code, but I'm looking for a structural fix. Even running a single test is slow since the database needs to be rebuilt / so...
How to determine if binary tree is balanced?
... some fraction of the minimum path length, like a half or a quarter.
It really doesn't matter usually. The point of any tree-balancing algorithm is to ensure that you do not wind up in the situation where you have a million nodes on one side and three on the other. Donal's definition is fine in the...
How can I convince IE to simply display application/json rather than offer to download it?
...ed this broadly, but it works with IE8 on Vista.
To use this, remember, all the usual caveats about updating the registry apply. Stop IE. Then, cut and paste the following into a file, by the name of json-ie.reg.
Windows Registry Editor Version 5.00
;
; Tell IE to open JSON documents in the ...
MVC4 style bundle giving 403
... Johnstone
37.8k1111 gold badges7979 silver badges130130 bronze badges
20
...
How do I convert Word files to PDF programmatically? [closed]
I have found several open-source/freeware programs that allow you to convert .doc files to .pdf files, but they're all of the application/printer driver variety, with no SDK attached.
...
Why does Google +1 record my mouse movements? [closed]
...0);
c = c * b % d;
if (previousMouseMoveHandler) previousMouseMoveHandler.call(arguments);
d is (screen.width * screen.width + screen.height) * 1000000, and c is a variable that starts out as 1.
All of this is wrapped in the scope of an anonymous function, which itself is immediately evaluated to...
Is it fine to have foreign key as primary key?
...
Foreign keys are almost always "Allow Duplicates," which would make them unsuitable as Primary Keys.
Instead, find a field that uniquely identifies each record in the table, or add a new field (either an auto-incrementing integer or a GUID) to act as the p...
get and set in TypeScript
...
})();
So to use it,
var myFoo = new foo();
if(myFoo.bar) { // calls the getter
myFoo.bar = false; // calls the setter and passes false
}
However, in order to use it at all, you must make sure the TypeScript compiler targets ECMAScript5. If you are running the command line compile...