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Variable declaration placement in C
...ation and initialization of a C++ local object then you pay the cost of an extra constructor for nothing. If the no-arg constructor does not exist then again you are not even allowed to separate both!
C99 starts to move C in this same direction.
If you are worried of not finding where local varia...
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 ...
How to make connection to Postgres via Node.js
... I interact with this through node? For example, what would the connectionstring be, or how am I able to find out what it is.
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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&...
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 can I convert tabs to spaces in every file of a directory?
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DO NOT USE SED! If there's an embedded tab in a string, you may end up mangling your code. This is what expand command was meant to handle. Use expand.
– David W.
Nov 12 '13 at 17:11
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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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How to set up Spark on Windows?
...o choose a Spark pre-built package for Hadoop Spark download. Download and extract it.
Set SPARK_HOME and add %SPARK_HOME%\bin in PATH variable in environment variables.
Run command: spark-shell
Open http://localhost:4040/ in a browser to see the SparkContext web UI.
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Common MySQL fields and their appropriate data types
... |
| salt | CHAR(x) | randomly generated string, usually of
fixed length (x)
| digest (md5) | CHAR(32) | |
| phone number | VAR...
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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