大约有 30,000 项符合查询结果（耗时：0.0517秒） [XML]
How to unit test an object with database queries
...a, but applies to all OO-languages)
class Database {
public Result query(String query) {... real db here ...}
}
class MockDatabase extends Database {
public Result query(String query) {
return "mock result";
}
}
class ObjectThatUsesDB {
public ObjectThatUsesDB(Database db) {
this....
MySQL Conditional Insert
...t have dual already, you need to create it. CREATE TABLE dual ( dummy CHAR(1) DEFAULT 'x' NOT NULL CHECK (dummy = 'x') PRIMARY KEY ); INSERT INTO dual VALUES('x'); REVOKE ALL ON dual FROM PUBLIC; GRANT SELECT ON dual TO PUBLIC;
– Jonathan Leffler
Feb 24 '...
Tools to selectively Copy HTML+CSS+JS From A Specific Element of DOM [closed]
...s tool. You can install SnappySnippet from Github. It allows easy HTML+CSS extraction from the specified (last inspected) DOM node. Additionally, you can send your code straight to CodePen or JSFiddle. Enjoy!
Other features
cleans up HTML (removing unnecessary attributes, fixing indentation)
op...
Mongoose (mongodb) batch insert?
...
Would this work with the extra stuff that mongoose schema provides? ex will this add the data if no date exists dateCreated : { type: Date, default: Date.now },
– jack blank
Feb 9 '17 at 5:45
...
Difference between “git add -A” and “git add .”
.... and by doing that it makes his life easier even after accounting for the extra mental tax added to ensure that there're no sync problems? I wonder why Git doesn't furthur split add -u into two separate commands add -u1 and add-u2 whereby one works for files starting with numerals and the other for...
How do I calculate a point on a circle’s circumference?
...
@Dean No need for extra brackets because of the operator precedence. When you have + and * like in those two equations and without any brackets you always go for the * first and then for the +.
– rbaleksandar
...
What are the differences between a pointer variable and a reference variable in C++?
..., the lifetime of that object becomes the lifetime of the reference.
std::string s1 = "123";
std::string s2 = "456";
std::string s3_copy = s1 + s2;
const std::string& s3_reference = s1 + s2;
In this example s3_copy copies the temporary object that is a result of the concatenation. Whereas s3...
What is a vertical tab?
What was the original historical use of the vertical tab character ( \v in the C language, ASCII 11)?
10 Answers
...
DateTime vs DateTimeOffset
... value with Kind=Local using Json.Net and an ISO date format, you'll get a string like 2015-08-05T07:00:00-04. Notice that last part (-04) had nothing to do with your DateTime or any offset you used to calculate it... it's just purely the server's time zone offset.
Meanwhile, DateTimeOffset explic...
Selecting data from two different servers in SQL Server
... ]
[ , [ @location= ] 'location' ]
[ , [ @provstr= ] 'provider_string' ]
[ , [ @catalog= ] 'catalog' ]
Read more about sp_addlinkedserver.
You have to create linked server only once. After creating linked server, we can query it as follows:
select * from LinkedServerName.Datab...