大约有 37,000 项符合查询结果（耗时：0.0416秒） [XML]
Why use 'virtual' for class properties in Entity Framework model definitions?
... nullable Foreign Key in SQL. You do not HAVE to eagerly join every keyed table when performing a query, but when you need the information -- it becomes demand-driven.
I also mentioned nullable because many navigation properties are not relevant at first. i.e. In a customer / Orders scenario, y...
Moving matplotlib legend outside of the axis makes it cutoff by the figure box
...me!):
Code:
#==================================================
# Plot table
colmap = [(0,0,1) #blue
,(1,0,0) #red
,(0,1,0) #green
,(1,1,0) #yellow
,(1,0,1) #magenta
,(1,0.5,0.5) #pink
,(0.5,0.5,0.5) #gray
,(0.5,0,0) #brown
...
Script to kill all connections to a database (More than RESTRICTED_USER ROLLBACK)
...use the dm_exec_sessions DMV, replacing the deprecated sysprocesses system table:
USE [master];
GO
DECLARE @Kill VARCHAR(8000) = '';
SELECT
@Kill = @Kill + 'kill ' + CONVERT(VARCHAR(5), session_id) + ';'
FROM
sys.dm_exec_sessions
WHERE
database_id = DB_ID('<YourDB>');
EXEC sys....
How to increment a pointer address and pointer's value?
... 2) in this case Associativity is from **Right-Left**
important table to remember in case of pointers and arrays:
operators precedence associativity
1) () , [] 1 left-right
2) * , identifier 2 right-l...
搭建高可用mongodb集群（二）—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...
....168.1.136:27017 would veto with 'I don't think 192.168.1.138:27017 is electable'
Sun Dec 29 20:26:31.059 [rsHealthPoll] replset info 192.168.1.137:27017 thinks that we are down
Sun Dec 29 20:26:31.059 [rsHealthPoll] replSet member 192.168.1.137:27017 is now in state STARTUP2
Sun Dec 29 20:26:31....
parseInt(null, 24) === 23… wait, what?
...o find out what the toString representation of null is. We need to look at Table 13 — ToString Conversions in section 9.8.0 for that information:
Great, so now we know that doing toString(null) internally yields a 'null' string. Great, but how exactly does it handle digits (characters) that are...
Is there a way to get colored text in Github Flavored Markdown? [duplicate]
... For more symbols, see this page apps.timwhitlock.info/emoji/tables/unicode
– M.K. Safi
May 29 '16 at 1:10
1
...
Tab space instead of multiple non-breaking spaces (“nbsp”)?
...t you really want, but its browser support has been erratic. Failing that, table-layout or maybe flexbox are your best bets.
– Alohci
May 30 '17 at 12:53
...
What is the purpose of the EBP frame pointer register?
...er can figure out where local variables and arguments are using the symbol table since they are guaranteed to be at a constant offset to EBP. Otherwise there isn't an easy way to figure where a local variable is at any point in code.
As Greg mentioned, it also helps stack unwinding for a debugger s...
How to get the current time in Python
...displaying the time with Python for the user, ctime works nicely, not in a table (it doesn't typically sort well), but perhaps in a clock. However, I personally recommend, when dealing with time in Python, either using Unix time, or a timezone aware UTC datetime object.
...