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MongoDB数据导出导入工具：mongoexport,mongoimport - 大数据 & AI - 清泛...
...要导出的文件名
-q: 指明导出数据的过滤条件
实例：test库中存在着一个students集合，集合中数据如下：
> db.students.find()
{ "_id" : ObjectId("5031143350f2481577ea81e5"), "classid" : 1, "age" : 20, "name" : "kobe" }
{ "_id" : ObjectId("5031144a50f2481577ea...
jQuery selector regular expressions
...nswer and is susceptible to link rot. Additionally, I found two bugs while testing the code - it will drop commas from regular expressions containing them (solved by replacing matchParams.join('') with matchParams.join(',')), and any pattern that matches 'undefined' or 'null' will match undefined an...
How to step through Python code to help debug issues?
...t some breakpoints from the command line:
ipdb3 -c 'b 12' -c 'b myfunc' ~/test/a.py
although -c c is broken for some reason: https://github.com/gotcha/ipdb/issues/156
python -m module debugging has been asked at: How to debug a Python module run with python -m from the command line? and since Py...
How can I represent an 'Enum' in Python?
...
@shahjapan: Interesting, but relatively slow: a test is done for each access like Animals.DOG; also, the values of the constats are strings, so that comparisons with these constants are slower than if, say, integers were allowed as values.
– Eric O Le...
Parse email content from quoted reply
...ons.IgnoreCase | RegexOptions.Multiline);
Here is my small collection of test responses (samples divided by --- ):
From: test@test.com [mailto:test@test.com]
Sent: Tuesday, January 13, 2009 1:27 PM
----
2008/12/26 <test@test.com>
> text
----
test@test.com wrote:
> text
----
t...
How do you rename a MongoDB database?
...
NOTE: Hopefully this changed in the latest version.
You cannot copy data between a MongoDB 4.0 mongod instance (regardless
of the FCV value) and a MongoDB 3.4 and earlier mongod instance.
https://docs.mongodb.com/v4.0/reference/method/db.copyDatabase/
...
php $_POST array empty upon form submission
...en posting from HTTP to HTTPS, the $_POST comes empty.
This happened while testing the form, but took me a while until I realize that.
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What is the difference between g++ and gcc?
...ng dependencies on math, RTTI, and exception information. Whether a given test case links or fails will depend on the operating system and which C++ features are used by the test case, which again is why all of that knowledge is built into the g++ driver instead of being left up to the user to figu...
How to color System.out.println output? [duplicate]
...or fg in {30..37} 39; do for bg in {40..47} 49; do printf "\e[${fg};${bg}m~TEST~"; done; printf "\n"; done;
Result:
Quick Reference (Color)
+~~~~~~+~~~~~~+~~~~~~~~~~~+
| fg | bg | color |
+~~~~~~+~~~~~~+~~~~~~~~~~~+
| 30 | 40 | black |
| 31 | 41 | red |
| 32 | 42 ...
How do you get assembler output from C/C++ source in gcc?
... generate what code:
# create assembler code:
g++ -S -fverbose-asm -g -O2 test.cc -o test.s
# create asm interlaced with source lines:
as -alhnd test.s > test.lst
Found in Algorithms for programmers, page 3 (which is the overall 15th page of the PDF).
...