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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)?
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Check if a String contains numbers Java
I'm writing a program where the user enters a String in the following format:
14 Answers
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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?
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@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&...
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 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.
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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 ...
What's the “big idea” behind compojure routes?
...ate to a proper response map; Compojure provides sane default handling for strings (as seen above) and a number of other object types; see the compojure.response/render multimethod for details (the code is entirely self-documenting here).
Let's try using defroutes now:
(defroutes example-routes
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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
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Common MySQL fields and their appropriate data types
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| salt | CHAR(x) | randomly generated string, usually of
fixed length (x)
| digest (md5) | CHAR(32) | |
| phone number | VAR...