大约有 16,000 项符合查询结果（耗时：0.0248秒） [XML]
Https Connection Android
...tSocketFactory ();
}
catch (Exception e)
{
e.printStackTrace();
}
}
public Socket createSocket() throws IOException
{
return FACTORY.createSocket();
}
// TODO: add other methods like createSocket() and getDefaultCipherSuites().
// Hint: they all just m...
How to use php serialize() and unserialize()
...f a script, you need to serialize it. That just means to put the structure into a "lower common denominator" that can be handled by things other than PHP, like databases, text files, sockets. The standard PHP function serialize is just a format to express such a thing, it serializes a data structure...
dplyr: “Error in n(): function should not be called directly”
...oup"
df %>%
group_by_(g) %>%
summarise_(
n = n(),
sum = interp(~sum(col, na.rm = TRUE), col = as.name(g))
)
# Error in n() : This function should not be called directly
It can be solved as follows.
df %>%
group_by_(g) %>%
summarise_(
n = "n()",
sum = interp(...
log4net argument to LogManager.GetLogger
...
There's no point for using reflection to get the type name, and the copy/past is laziness and you get a performance hit, so why not get just the name?!
– MeTitus
Apr 8 '17 at 23:43
...
How to catch SQLServer timeout exceptions
...etwork Library=DBMSSOCN;Data Source=YourServer,1433;Initial Catalog=YourDB;Integrated Security=SSPI;");
sql.Open();
SqlCommand cmd = sql.CreateCommand();
cmd.CommandText = "DECLARE @i int WHILE EXISTS (SELECT 1 from sysobjects) BEGIN SELECT @i = 1 END";
cmd.ExecuteNonQuery(); // Thi...
How to check if command line tools is installed
...mpt you to install them!
To check if they exist, xcode-select -p will print the directory. Alternatively, the return value will be 2 if they do NOT exist, and 0 if they do. To just print the return value (thanks @Andy):
xcode-select -p 1>/dev/null;echo $?
10.9 Mavericks Update:
Use pkgut...
Getting raw SQL query string from PDO prepared statements
...I assume you mean that you want the final SQL query, with parameter values interpolated into it. I understand that this would be useful for debugging, but it is not the way prepared statements work. Parameters are not combined with a prepared statement on the client-side, so PDO should never have ...
How do I update if exists, insert if not (AKA “upsert” or “merge”) in MySQL?
...
Use INSERT ... ON DUPLICATE KEY UPDATE. For example:
INSERT INTO `usage`
(`thing_id`, `times_used`, `first_time_used`)
VALUES
(4815162342, 1, NOW())
ON DUPLICATE KEY UPDATE
`times_used` = `times_used` + 1
sha...
Set TextView text from html-formatted string resource in XML
...
That is what the docs say: developer.android.com/intl/zh-TW/guide/topics/resources/… but is that enough for the TextView to show HTML?
– Macarse
Jul 13 '10 at 13:19
...
Time complexity of Euclid's Algorithm
...e, instead of only one, which makes the analysis easier. You can divide it into cases:
Tiny A: 2a <= b
Tiny B: 2b <= a
Small A: 2a > b but a < b
Small B: 2b > a but b < a
Equal: a == b
Now we'll show that every single case decreases the total a+b by at least a quarter:
Tiny A...