大约有 40,000 项符合查询结果（耗时：0.0619秒） [XML]
How to test which port MySQL is running on and whether it can be connected to?
...ou can connect using a socket over TCP/IP. Check out the MySQL docs.
See http://dev.mysql.com/doc/refman/5.0/en/connector-j-reference-configuration-properties.html
UPDATE:
I tried to telnet into MySQL (telnet ip 3306), but it doesn't work:
http://lists.mysql.com/win32/253
I think this is what...
Find all records which have a count of an association greater than zero
...istinct
As an example
[10] pry(main)> Comment.distinct.pluck :article_id
=> [43, 34, 45, 55, 17, 19, 1, 3, 4, 18, 44, 5, 13, 22, 16, 6, 53]
[11] pry(main)> _.size
=> 17
[12] pry(main)> Article.joins(:comments).size
=> 45
[13] pry(main)> Article.joins(:comments).distinct.size
...
How can I completely remove TFS Bindings
...I'd get an annoying popup saying
"Go Offline
The Team Foundation Server http://some-other-guys-tfs-server/
is currently unavailable.
The solution will be opened offline."
To get rid of this, I deleted the .suo next to the .sln file, and then opened the .sln file in Notepad and deleted this en...
What is the use for IHttpHandler.IsReusable?
I'm writing a IHttpHandler and I'll need to implement a IsReusable property. When I look at the MSDN documentation it says:
...
What would be the Unicode character for big bullet in the middle of the character?
...
http://www.unicode.org is the place to look for symbol names.
● BLACK CIRCLE 25CF
⚫ MEDIUM BLACK CIRCLE 26AB
⬤ BLACK LARGE CIRCLE 2B24
or even:
???? NEW MOON SYMBOL 1F311
Good luck finding a font that su...
How can I test https connections with Django as easily as I can non-https connections using 'runserv
...tunnel.cert > stunnel.pem
Create a config file for stunnel called dev_https with the following contents:
pid=
cert = stunnel/stunnel.pem
sslVersion = SSLv3
foreground = yes
output = stunnel.log
[https]
accept=8443
connect=8001
TIMEOUTclose=1
This file tells stunnel what it needs to know. ...
How to write trycatch in R
... to the R world ;-)
Here you go
Setting up the code
urls <- c(
"http://stat.ethz.ch/R-manual/R-devel/library/base/html/connections.html",
"http://en.wikipedia.org/wiki/Xz",
"xxxxx"
)
readUrl <- function(url) {
out <- tryCatch(
{
# Just to highlight: i...
Converting .NET DateTime to JSON [duplicate]
...
On how to format the date exactly as you want, see full Date reference at http://www.w3schools.com/jsref/jsref_obj_date.asp
You could strip the non-digits by either parsing the integer (as suggested here):
var date = new Date(parseInt(jsonDate.substr(6)));
Or applying the following regular expr...
How do you version your database schema? [closed]
...egrated SQL clients, etc.
Have a look at the wiki for more information :
http://www.nextep-softwares.com/wiki
It currently supports Oracle, MySql and PostgreSql and is in java so the product runs on windows, linux and mac.
...
Why invoke Thread.currentThread.interrupt() in a catch InterruptException block?
...
Note:
http://download.oracle.com/javase/7/docs/technotes/guides/concurrency/threadPrimitiveDeprecation.html
How do I stop a thread that waits for long periods (e.g., for input)?
For this technique to work, it's critical that a...