大约有 30,000 项符合查询结果（耗时：0.0500秒） [XML]
Facebook database design?
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Keep a friend table that holds the UserID and then the UserID of the friend (we will call it FriendID). Both columns would be foreign keys back to the Users table.
Somewhat useful example:
Table Name: User
Columns:
UserID PK
EmailAddress
Password
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Why should a Java class implement comparable?
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Here is a real life sample. Note that String also implements Comparable.
class Author implements Comparable<Author>{
String firstName;
String lastName;
@Override
public int compareTo(Author other){
// compareTo should return < 0...
Does adding a duplicate value to a HashSet/HashMap replace the previous value
...
Correct me if I'm wrong but what you're getting at is that with strings, "Hi" == "Hi" doesn't always come out true (because they're not necessarily the same object).
The reason you're getting an answer of 1 though is because the JVM will reuse strings objects where possible. In this cas...
How do I use .toLocaleTimeString() without displaying seconds?
... the seconds. Is there a way I can do this using Javascript's .toLocaleTimeString()?
11 Answers
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When should an IllegalArgumentException be thrown?
...for this design:
import com.someoneelse.EmailUtil;
public void scanEmail(String emailStr, InputStream mime) throws ParseException {
EmailAddress parsedAddress = EmailUtil.parseAddress(emailStr);
}
If EmailUtil is transparent, for instance maybe it's a private method owned by the class under ...
Why doesn't a python dict.update() return the object?
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Also, if the keys in award_dict are not string the interpreter will throw a TypeError
– kunl
Aug 1 '15 at 14:59
3
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How to reference a method in javadoc?
...on, is:
Examples
Method in the same class:
/** See also {@link #myMethod(String)}. */
void foo() { ... }
Method in a different class, either in the same package or imported:
/** See also {@link MyOtherClass#myMethod(String)}. */
void foo() { ... }
Method in a different package and not imported:...
JOIN queries vs multiple queries
...ins, multiple queries is much better... look at the following benchmark I did:
Single query with 5 Joins
query: 8.074508 seconds
result size: 2268000
5 queries in a row
combined query time: 0.00262 seconds
result size: 165 (6 + 50 + 7 + 12 + 90)
.
Note that we get the same results in both ...
Should you declare methods using overloads or optional parameters in C# 4.0?
...meters feature of 4.0. It gets rid of the ridiculous ...
public void M1( string foo, string bar )
{
// do that thang
}
public void M1( string foo )
{
M1( foo, "bar default" ); // I have always hated this line of code specifically
}
... and puts the values right where the caller can see the...
How to profile methods in Scala?
... You can add a label to your prints with some currying: def time[R](label: String)(block: => R): R = { then add the label to the println
– Glenn 'devalias'
Jan 7 '17 at 23:52
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