大约有 30,160 项符合查询结果（耗时：0.0542秒） [XML]
How to implement a many-to-many relationship in PostgreSQL?
...al primary key columns
Auto increment table column
https://www.2ndquadrant.com/en/blog/postgresql-10-identity-columns/
I highly recommend that, because the name of a product is hardly unique (not a good "natural key"). Also, enforcing uniqueness and referencing the column in foreign keys is typical...
Deserialize JSON to ArrayList using Jackson
...e deserialization. MyPojo has only int and String instance variables combined with proper getters and setters. MyPojoDeMixIn looks something like this:
...
Symfony2 : How to get form validation errors after binding the request to the form
...
|
show 1 more comment
103
...
What does git push origin HEAD mean?
...accident.
If you want to push a different branch than the current one the command will not work.
share
|
improve this answer
|
follow
|
...
Facebook database design?
...ds
Columns:
UserID PK FK
FriendID PK FK
(This table features a composite primary key made up of the two foreign
keys, both pointing back to the user table. One ID will point to the
logged in user, the other ID will point to the individual friend
of that user)
Example Us...
Git branch strategy for small dev team [closed]
... article on his site on how Github's workflow with Git works - scottchacon.com/2011/08/31/github-flow.html
– program247365
Dec 29 '11 at 21:51
71
...
Read/write to Windows registry using Java
... in the java.util.prefs.Preferences class. The internals of this class are complicated, but the class itself is very easy to use.
For example, the following code obtains the exact windows distribution from the registry:
String value = WinRegistry.readString (
WinRegistry.HKEY_LOCAL_MACHINE, ...
iPhone - Grand Central Dispatch main thread
...nished e.g.
- (void)doCalculation
{
//you can use any string instead "com.mycompany.myqueue"
dispatch_queue_t backgroundQueue = dispatch_queue_create("com.mycompany.myqueue", 0);
dispatch_async(backgroundQueue, ^{
int result = <some really long calculation that takes seconds...
How do I remove a big file wrongly committed in git [duplicate]
I did a stupid thing. Imagine that I committed a 100MB file. Then I see this and delete this file and commit again. This is a normal procedure to delete a file.
...