大约有 16,000 项符合查询结果（耗时：0.0351秒） [XML]
How do I generate random number for each row in a TSQL Select?
...imes in a single batch, rand() returns the same number.
I'd suggest using convert(varbinary,newid()) as the seed argument:
SELECT table_name, 1.0 + floor(14 * RAND(convert(varbinary, newid()))) magic_number
FROM information_schema.tables
newid() is guaranteed to return a different value each ti...
How often does python flush to a file?
...
For file operations, Python uses the operating system's default buffering unless you configure it do otherwise. You can specify a buffer size, unbuffered, or line buffered.
For example, the open function takes a buffer size argument.
http://docs.python.org/library/func...
How can I read large text files in Python, line by line, without loading it into memory?
...approximately) that size (in bytes). A negative buffering means to use the system default, which is usually line buffered for tty devices and fully buffered for other files. If omitted, the system default is used
– jyoti das
Apr 19 '18 at 5:26
...
How do I prevent an Android device from going to sleep programmatically?
...e a wake lock. Example from the docs:
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "My Tag");
wl.acquire();
// screen and CPU will stay awake during this section
wl.release();
There's also ...
How to convert wstring into string?
The question is how to convert wstring to string?
16 Answers
16
...
Parsing JSON using Json.net
...
}
Edit:
Json.NET works using the same JSON and classes.
Foo foo = JsonConvert.DeserializeObject<Foo>(json);
Link: Serializing and Deserializing JSON with Json.NET
share
|
improve this a...
Installing R on Mac - Warning messages: Setting LC_CTYPE failed, using “C”
...
In my system (OS X 10.11 El Capitán) I have environment variables LANG and LC_ALL set to en_US.UTF-8 for my terminal (in the ~/.bash_profile file), and command line R does not display those warning messages; but R Studio does. Fo...
How do I check if an index exists on a table field in MySQL?
...ame) full_path_schema, y.name index_name
FROM information_schema.INNODB_SYS_TABLES as x
JOIN information_schema.INNODB_SYS_INDEXES as y on x.TABLE_ID = y.TABLE_ID
WHERE x.name = 'your_schema'
and y.name = 'your_column') d on concat(a.table_schema, '/', a.table_name, '/', a.column_name) ...
UTF-8 byte[] to String
...ext file into a byte array. I know that I can use the following routine to convert the bytes to a string, but is there a more efficient/smarter way of doing this than just iterating through the bytes and converting each one?
...
How to re-raise an exception in nested try/except blocks?
...ument form of raise:
try:
something()
except SomeError:
t, v, tb = sys.exc_info()
try:
plan_B()
except AlsoFailsError:
raise t, v, tb
share
|
improve this answer
...