大约有 3,300 项符合查询结果（耗时：0.0179秒） [XML]
Akka Kill vs. Stop vs. Poison Pill?
...e, then call its postStop hook. All further messages are sent to the dead letters mailbox.
The difference is in which messages get processed before this sequence starts. In the case of the stop call, the message currently being processed is completed first, with all others discarded. When sendin...
Are PostgreSQL column names case-sensitive?
...names that were created with double-quotes and thereby retained upper-case letters (and/or other syntax violations) have to be double-quoted for the rest of their life: ("first_Name")
So, yes, PostgreSQL column names are case-sensitive:
SELECT * FROM persons WHERE "first_Name" = 'xyz';
Also fix ...
Select rows of a matrix that meet a condition
...
m <- matrix(1:20, ncol = 4)
colnames(m) <- letters[1:4]
The following command will select the first row of the matrix above.
subset(m, m[,4] == 16)
And this will select the last three.
subset(m, m[,4] > 17)
The result will be a matrix in both cases.
If you ...
phantomjs not waiting for “full” page load
...nsole.log(' paper (pdf output) examples: "5in*7.5in", "10cm*20cm", "A4", "Letter"');
phantom.exit(1);
} else {
address = system.args[1];
output = system.args[2];
if (system.args.length > 3 && system.args[2].substr(-4) === ".pdf") {
size = system.args[3].split('*')...
Extract a substring from a string in Ruby using a regular expression
...an array of the captures
matchdata.captures # ["ants","pants"]
# Or use raw indices
matchdata[0] # whole regex match: "<ants> <pants>"
matchdata[1] # first capture: "ants"
matchdata[2] # second capture: "pants"
...
How to get value from form field in django framework?
...
This answer best summarises all the options - accessing raw POST data, unvalidated form fields and finally validated form fields.
– Serge Merzliakov
Jun 30 '17 at 4:12
...
Check if object is file-like in Python
...tIOBase)
isinstance(something, io.BufferedIOBase)
isinstance(something, io.RawIOBase)
isinstance(something, io.IOBase)
For 2.x, "file-like object" is too vague a thing to check for, but the documentation for whatever function(s) you're dealing with will hopefully tell you what they actually need; ...
Unit Testing AngularJS directive with templateUrl
...found that you can get around ngMock's takeover of $httpBackend by using a raw XHR to fetch the template for real and insert it into the $templateCache. This solution is much less flexible, but it gets the job done for now.
// my-test.js
// Make template available to unit tests without Karma
//
//...
Why would a JavaScript variable start with a dollar sign? [duplicate]
...l");
var emailJQ = $(email);
Since JavaScript treats $ as simply another letter for names, and since I always got a jQuery object back from a $(whatever) call, the pattern finally dawned on me. I could take a $(...) call and just remove some characters, and it would come up with a pretty nice name...
mysqli_fetch_assoc() expects parameter / Call to a member function bind_param() errors. How to get t
... that a particular table doesn't exist, you have to check spelling, typos, letter case. Also you have to make sure that your PHP script connects to a correct database
Or, if it says there is an error in the SQL syntax, then you have to examine your SQL. And the problem spot is right before the query...