大约有 23,000 项符合查询结果（耗时：0.0233秒） [XML]
Base64: What is the worst possible increase in space usage?
If a server received a base64 string and wanted to check it's length before converting,, say it wanted to always permit the final byte array to be 16KB. How big could a 16KB byte array possibly become when converted to a Base64 string (assuming one byte per character)?
...
Check if a String contains numbers Java
I'm writing a program where the user enters a String in the following format:
14 Answers
...
Copying PostgreSQL database to another server
... to work compressed you can use a compressed tunnel
pg_dump -C dbname | bzip2 | ssh remoteuser@remotehost "bunzip2 | psql dbname"
or
pg_dump -C dbname | ssh -C remoteuser@remotehost "psql dbname"
but this solution also requires to get a session in both ends.
Note: pg_dump is for backing up...
How do you make sure email you send programmatically is not automatically marked as spam?
...he DNS information for your site.
Check your reverse DNS to make sure the IP address of your mail server points to the domain name that you use for sending mail.
Make sure that the IP-address that you're using is not on a blacklist
Make sure that the reply-to address is a valid, existing address....
Do htmlspecialchars and mysql_real_escape_string keep my PHP code safe from injection?
...s infinitely safer than using escaping functions such as mysql_real_escape_string.
Yes, mysql_real_escape_string is effectively just a string escaping function. It is not a magic bullet. All it will do is escape dangerous characters in order that they can be safe to use in a single query string. Ho...
How to handle Objective-C protocols that contain properties?
...
@interface MyClass () // Class extension
@property (nonatomic, strong) NSString *name;
@end
How to use property in protocol
So to use MyClass with that name property, we have to do either
Declare the property again (AppDelegate.h does this way)
@interface MyClass : NSObject <MyProtocol&...
What is the difference between varchar and varchar2 in Oracle?
...ARCHAR is reserved by Oracle to support distinction between NULL and empty string in future, as ANSI standard prescribes.
VARCHAR2 does not distinguish between a NULL and empty string, and never will.
If you rely on empty string and NULL being the same thing, you should use VARCHAR2.
...
Storing sex (gender) in database
... space savings, it only pays off if you have multiple bit fields.
Second, strings/chars have a "magic value" feel to them, regardless of how obvious they may seem at design time. Not to mention, it lets people store just about any value they would not necessarily map to anything obvious.
Third, a ...
Standard alternative to GCC's ##__VA_ARGS__ trick?
...argc, char *argv[])
{
BAR("first test");
BAR("second test: %s", "a string");
return 0;
}
This same trick is used to:
count the number of arguments
expand differently depending on the number of arguments
append to __VA_ARGS__
Explanation
The strategy is to separate __VA_ARGS__ into...
What are five things you hate about your favorite language? [closed]
...are only a few different error messages and a few different types (Number, String, Object, etc.)
If it wasn't for jQuery, I'd probably still hate it as much as I used to :)
share
...