大约有 43,000 项符合查询结果（耗时：0.0302秒） [XML]
COUNT DISTINCT with CONDITIONS
... be included in count.
One thing to note here is that this can be done by reading the table once. When it seems that you have to read the same table twice or more, it can actually be done by reading once, in most of the time. As a result, it will finish the task a lot faster with less I/O.
...
How can I read a function's signature including default argument values?
Given a function object, how can I get its signature? For example, for:
8 Answers
8
...
How to embed a text file in a .NET assembly?
...d a text file in an assembly so that I can load the text without having to read it from disk, and so that everything I need is contained within the exe. (So that it's more portable)
...
Seeing the console's output in Visual Studio 2010?
...ink for abit more info social.msdn.microsoft.com/Forums/en/csharpgeneral/thread/…
– Richard Adnams
Mar 14 '11 at 16:22
...
ALTER TABLE without locking the table?
When doing an ALTER TABLE statement in MySQL, the whole table is read-locked (allowing concurrent reads, but prohibiting concurrent writes) for the duration of the statement. If it's a big table, INSERT or UPDATE statements could be blocked for a looooong time. Is there a way to do a "hot alter", li...
What's the difference between ConcurrentHashMap and Collections.synchronizedMap(Map)?
I have a Map which is to be modified by several threads concurrently.
19 Answers
19
...
Longest line in a file
...l commands. Takes filename as first argument:
#!/bin/sh
MAX=0 IFS=
while read -r line; do
if [ ${#line} -gt $MAX ]; then MAX=${#line}; fi
done < "$1"
printf "$MAX\n"
share
|
improve this ans...
Java FileReader encoding issue
I tried to use java.io.FileReader to read some text files and convert them into a string, but I found the result is wrongly encoded and not readable at all.
...
Using AES encryption in C#
...Stream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
// Read the decrypted bytes from the decrypting stream
...
HTML-encoding lost when attribute read from input field
...n the escape templatetag in Django, which I guess is heavily used/tested already, I made this function which does what's needed.
It's arguably simpler (and possibly faster) than any of the workarounds for the whitespace-stripping issue - and it encodes quote marks, which is essential if you're goin...