大约有 5,886 项符合查询结果（耗时：0.0138秒） [XML]
Good reasons NOT to use a relational database?
...upport for versioning of data
Berkeley DB (Basically, a disk based hashtable)
Very simple conceptually (just un-typed key/value)
Quite fast
No administration overhead
Supports transactions I believe
Amazon's Simple DB
Much like Berkeley DB I believe, but hosted
Google's App Engine Da...
How to check if there exists a process with a given pid in Python?
...ef pid_exists(pid):
"""Check whether pid exists in the current process table.
UNIX only.
"""
if pid < 0:
return False
if pid == 0:
# According to "man 2 kill" PID 0 refers to every process
# in the process group of the calling process.
# On cert...
Converting numpy dtypes to native python types
...however it is deprecated since NumPy 1.16).
For the curious, to build a table of conversions of NumPy array scalars for your system:
for name in dir(np):
obj = getattr(np, name)
if hasattr(obj, 'dtype'):
try:
if 'time' in name:
npn = obj(0, 'D')
...
Check if all elements in a list are identical
... explanation of alternatives. Can you please double check your performance table - is it all in msec, and are the numbers in the correct cells?
– max
Oct 2 '10 at 8:26
...
When creating HTML emails, should we use html, head, body tags?
...s on or not. Unfortunately, you can’t control that in a webmail setting. Tables and inline styles are your friends. Your best bet is to test in as many webmail and desktop clients as you can.
share
|
...
What happened to console.log in IE8?
...d: trap,
count: trap,
exception: trap,
table: trap
};
}
})(null); // to define a fallback function, replace null with the name of the function (ex: alert)
Some extra info
The line var args = Array.prototype.slice.call(arguments); creates an Array f...
CSS: Set a background color which is 50% of the width of the window
...
Thanks, it helped me to achieve this effect on a table: jsfiddle.net/c9kp2pde
– user2015707
Apr 22 '15 at 15:54
12
...
How can I wait for set of asynchronous callback functions?
...ng a promise polyfill), then you can use ES6-specified promises. See this table for browser support. Promises are supported in pretty much all current browsers, except IE.
If doAjax() returns a promise, then you can do this:
var promises = [];
for (var i = 0; i < 10; i++) {
promises.push(...
Use jQuery to change an HTML tag?
...
Once a dom element is created, the tag is immutable, I believe. You'd have to do something like this:
$(this).replaceWith($('<h5>' + this.innerHTML + '</h5>'));
share
|
...
mongodb: insert if not exists
...
You may use Upsert with $setOnInsert operator.
db.Table.update({noExist: true}, {"$setOnInsert": {xxxYourDocumentxxx}}, {upsert: true})
share
|
improve this answer
...