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Test if string is a number in Ruby on Rails
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Create is_number? Method.
Create a helper method:
def is_number? string
true if Float(string) rescue false
end
And then call it like this:
my_string = '12.34'
is_number?( my_string )
# => true
Extend String Class.
If you want to be able to call is_number? directly on the string...
How to send password securely over HTTP?
...nstructed as follows:
The username and password are combined into a string separated by a
colon, e.g.: username:password
The resulting string is encoded using
the RFC2045-MIME variant of Base64, except not limited to 76
char/line.
The authorization method and a space i.e. "Basic ...
How to get the primary IP address of the local machine on Linux and OS X? [closed]
I am looking for a command line solution that would return me the primary (first) IP address of the localhost, other than 127.0.0.1
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How to identify server IP address in PHP
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Like this for the server ip:
$_SERVER['SERVER_ADDR'];
and this for the port
$_SERVER['SERVER_PORT'];
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WAMP 403 Forbidden message on Windows 7
... I couldnt format my address line in that last comment so there's an extra "'" in it just ignore that sorry if it confuses anyone.
– Jeremy
May 1 '12 at 19:57
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Deny all, allow only one IP through htaccess
I'm trying to deny all and allow only for a single IP. But, I would like to have the following htaccess working for that single IP. I'm not finding a way to have both working: the deny all and allow only one, plus the following options:
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Show MySQL host via SQL Command
...ink you try to get the remote host of the conneting user...
You can get a String like 'myuser@localhost' from the command:
SELECT USER()
You can split this result on the '@' sign, to get the parts:
-- delivers the "remote_host" e.g. "localhost"
SELECT SUBSTRING_INDEX(USER(), '@', -1)
-- deli...
Select rows which are not present in other table
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There are basically 4 techniques for this task, all of them standard SQL.
NOT EXISTS
Often fastest in Postgres.
SELECT ip
FROM login_log l
WHERE NOT EXISTS (
SELECT -- SELECT list mostly irrelevant; can just be empty in Postgres
FROM ip_location
WHERE ip = l.ip
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Connect Java to a MySQL database
... Create a simple Java class with a main() method to test the connection.
String url = "jdbc:mysql://localhost:3306/javabase";
String username = "java";
String password = "password";
System.out.println("Connecting database...");
try (Connection connection = DriverManager.getConnection(url, userna...
create a trusted self-signed SSL cert for localhost (for use with Express/Node)
...ating issue in window. 14148:error:0D07A097:asn1 encoding routines:ASN1_mbstring_ncopy:string too long:.\crypto\asn1\a_mbstr.c:158:maxsize=2
– Hermenpreet Singh
Jul 19 at 18:08
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