大约有 19,000 项符合查询结果（耗时：0.0255秒） [XML]
Flat file databases [closed]
...te. It works as a database, uses SQL, and is pretty easy to change over to MySQL (especially if you're using abstracted classes for database manipulation like I do!)
In fact, especially with the "accepted answer"'s method, it can drastically cut the memory usage of your app (you don't have to load a...
Getting the location from an IP address [duplicate]
...g JavaScript for client-side scripting, PHP for server-side scripting, and MySQL for the database.
23 Answers
...
How to use count and group by at the same select statement
...
needs alias otherwise wouldnt work in mysql. select count(*) from( ) agr
– amas
Jan 9 '14 at 6:54
add a comment
|
...
Mac zip compress without __MACOSX folder?
...
To apply to all zip files under some root: find ~ -type f -name '*.zip' -exec zip -d '{}' __MACOSX/\* \;. Substitute your starting point for ~.
– Chris Johnson
Jun 27 '17 at 12:05
...
Why are joins bad when considering scalability?
...
...except in MySQL, which seems to have performance problems with large numbers of joins regardless of how your indexes look. Or at least it has in the past.
– Powerlord
Apr 12 '10 at 17:53
...
On delete cascade with doctrine2
...rine's cascade={"remove"} removes the related entities before removing the root entity (it has to). So when the root entity is deleted there aren't any foreign relations left for onDelete="CASCADE" to delete. But to be sure I would suggest you simply create a small test case and look at the queries ...
ORA-00979 not a group by expression
...
@AaronDigulla That's what MySQL does, and the world didn't end :p
– Chris Baker
Aug 27 '14 at 21:32
1
...
When to use inline function and when not to use it?
... most important rule of optimization is that premature optimization is the root of all evil. Always write clear code (using efficient algorithms), then profile your program and only optimize functions that are taking too long.
If you find a particular function is very short and simple, and it's ge...
How to serialize an object to XML without getting xmlns=“…”?
...ter, object, xmlns);
you will have the three namespaces declared in the root element and no more needed to be generated in the other elements which will be prefixed accordingly
<root xmlns:one="urn:names:specification:schema:xsd:one" ... />
<one:Element />
<two:ElementFromAn...
IntelliJ does not show project folders
...hat pops up, click on the "..." next button which takes you to the Content root. Find your root folder and select it
Click the "ok" button
Ignore any warning that says the name is already in use
share
|
...