大约有 7,554 项符合查询结果（耗时：0.0176秒） [XML]
Adding 'serial' to existing column in Postgres
...quence value set to 0 is clumsy, if not illegal.
Using the three-parameter form of setval would be more appropriate:
-- vvv
SELECT setval('foo_a_seq', coalesce(max(a), 0) + 1, false) FROM foo;
-- ^ ^
-- ...
Why do we use Base64?
...nary - 0s and 1s - but people typically want to communicate with more rich forms data such as text or images. In order to transfer this data between computers it first has to be encoded into 0s and 1s, sent, then decoded again. To take text as an example - there are many different ways to perform th...
Is the != check thread safe?
...
Actually, assuming that the generated bytecode conforms to the JLS, it is a proof!
– proskor
Aug 27 '13 at 10:27
6
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Must Dependency Injection come at the expense of Encapsulation?
...d": they're explicitly exposed, and invariants around them are enforced. Information hiding is the better term for the kind of privacy you're referring to, @RonInbar, and it's not necessarily always beneficial (it makes the pasta harder to untangle ;-)).
– Nicholas Blumhardt
...
What are enums and why are they useful?
... is for
Programmers to efficiently and correctly express algorithms in a form computers can use.
Maintainers to understand algorithms others have written and correctly make changes.
Enums improve both likelihood of correctness and readability without writing a lot of boilerplate. If you are wil...
Error “initializer element is not constant” when trying to initialize variable with const
...for a compiler to extend this (6.6/10 - An implementation may accept other forms of constant expressions) but that would limit portability.
If you can change my_foo so it does not have static storage, you would be okay:
int main()
{
foo_t my_foo = foo_init;
return 0;
}
...
Does “untyped” also mean “dynamically typed” in the academic CS world?
...the latter is a (technically misleading) name for a particular case of the former.
PS: And FWIW, I happen to be both an academic researcher in type systems, and a non-academic implementer of JavaScript, so I have to live with the schisma. :)
...
How can you integrate a custom file browser/uploader with CKEditor?
... it into $callback.
When someone selects a file, run this JavaScript to inform CKEditor which file was selected:
window.opener.CKEDITOR.tools.callFunction(<?php echo $callback; ?>,url)
Where "url" is the URL of the file they picked. An optional third parameter can be text that you want dis...
How to save/restore serializable object to/from file?
... XML or Json serialization. Here are the functions to do it in the various formats. See my blog post for more details.
Binary
/// <summary>
/// Writes the given object instance to a binary file.
/// <para>Object type (and all child types) must be decorated with the [Serializable] attri...
SQL Server insert if not exists best practice
... the qquestion on SO. But the core of my thought is: How well will this perform against rebuilding the names table from scratch once a week or so? (remember this only takes a few seconds)
– Didier Levy
Mar 14 '11 at 12:35
...