大约有 9,000 项符合查询结果（耗时：0.0186秒） [XML]
Fastest way to count exact number of rows in a very large table?
...
Simple answer:
Database vendor independent solution = use the standard = COUNT(*)
There are approximate SQL Server solutions but don't use COUNT(*) = out of scope
Notes:
COUNT(1) = COUNT(*) = COUNT(PrimaryKey) just in case
...
Running unittest with typical test directory structure
The very common directory structure for even a simple Python module seems to be to separate the unit tests into their own test directory:
...
Merge 2 arrays of objects
Lets have a look at an example.
33 Answers
33
...
Generate a Hash from string in Javascript
I need to convert strings to some form of hash. Is this possible in JavaScript?
22 Answers
...
Pretty-print C++ STL containers
Please take note of the updates at the end of this post.
10 Answers
10
...
How to remove space between axis & area-plot in ggplot2?
...
Update: See @divibisan's answer for further possibilities in the latest versions of ggplot2.
From ?scale_x_continuous about the expand-argument:
Vector of range expansion constants used to add some padding around
the ...
How to get the parents of a merge commit in git?
Some git commands take the parent as a revision; others (such as git revert ), as a parent number. How to get the parents for both cases. I don’t want to use the graphical log command as that often requires scrolling down a long tree to find the second parent.
...
Disable password authentication for SSH [closed]
I'm looking for a way to disable SSH clients from accessing the password prompt as noted here .
5 Answers
...
Java regex email
...
FWIW, here is the Java code we use to validate email addresses. The Regexp's are very similar:
public static final Pattern VALID_EMAIL_ADDRESS_REGEX =
Pattern.compile("^[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,6}$", Pattern.CASE_INSENSITIVE);
public static boolean validate(String emailStr) {
...
What's the need of array with zero elements?
...se it like this:
struct bts_action *var = kmalloc(sizeof(*var) + extra, GFP_KERNEL);
This used to be not standard and was considered a hack (as Aniket said), but it was standardized in C99. The standard format for it now is:
struct bts_action {
u16 type;
u16 size;
u8 data[];
} __a...