ByteChemist » Web Development

Using SVN copy to branch or tag within a repository

CHEMiST — Sun, 22 Mar 2009 19:45:44 +0000

To “branch” or “tag” within a repository, use svn copy. The syntax is simple.

svn copy {SRC} {DST}

The source and destination can be either a working copy path or full URL in any combination. So to tag a revision from trunk the following command could be used.

svn copy --username myusername --password mypassword http://domain.com/svn/trunk http://domain.com/svn/tag/0.1.1332 -m "commit message"

Recover the MySQL Root Password in Linux

CHEMiST — Mon, 30 Jun 2008 23:06:05 +0000

Step 1 – At the linux shell, stop the current mysqld process, start the mysqld_safe process with –skip-grant-tables switch and login as root (no password).

/etc/init.d/mysql stop
mysqld_safe --skip-grant-tables &
mysql -u root

Step 2 – At the mysql shell set the root password and flush privileges.

USE mysql;
UPDATE user SET password=PASSWORD("new-password-here") WHERE User='root';
FLUSH PRIVILEGES;
QUIT;

Step 3 – Back at the linux shell stop the mysqld_safe process and start the normal mysqld process. At this point you should be able to successfully login as root using the password from Step 2.

/etc/init.d/mysql stop
/etc/init.d/mysql start
mysql -u root -p

Set MySQL Root Password

CHEMiST — Mon, 30 Jun 2008 22:45:11 +0000

To reset the MySQL root password, login to the mysql shell and run the following commands.

SET PASSWORD FOR root@localhost=PASSWORD('RootPasswordHere');
FLUSH PRIVILEGES;

Grant MySQL Privileges

CHEMiST — Mon, 30 Jun 2008 22:41:32 +0000

To grant all privileges to a user from any location login to the mysql shell and run the following queries.

GRANT ALL PRIVILEGES ON *.* TO username@localhost IDENTIFIED BY 'PasswordHere' WITH GRANT OPTION;
GRANT ALL PRIVILEGES ON *.* TO username@"%" IDENTIFIED BY 'PasswordHere' WITH GRANT OPTION;
FLUSH PRIVILEGES;

Apache Cache Control using mod_expires with Expires By Type

CHEMiST — Fri, 27 Jun 2008 17:14:54 +0000

Use Apache’s mod_expires to explicitly set the expiration of a file by it’s type. This will enable to browser to cache these static assets and greatly increase performance.

<IfModule mod_expires.c>
    ExpiresActive on
    ExpiresDefault "now"
    ExpiresByType text/html "now"
    ExpiresByType text/xml "now"
    ExpiresByType text/css "access plus 8 hours"
    ExpiresByType text/plain "access plus 8 hours"
    ExpiresByType application/x-javascript "access plus 8 hours"
    ExpiresByType application/x-shockwave-flash "access plus 8 hours"
    ExpiresByType application/pdf "access plus 8 hours"
    ExpiresByType image/gif "access plus 8 hours"
    ExpiresByType image/png "access plus 8 hours"
    ExpiresByType image/jpeg "access plus 8 hours"
    ExpiresByType image/x-icon "access plus 8 hours"
    ExpiresByType video/x-flv "access plus 8 hours"
    ExpiresByType video/quicktime "access plus 8 hours"
IfModule>

Using the ternary operator in PHP

CHEMiST — Sat, 12 Jan 2008 02:43:15 +0000

The ternary operator is an excellent and often underutilized way to quickly evaluate a variable in place of an if/else statement. The syntax is clean and can greatly simplify code.

( expr1 ) ? ( expr2 ) : ( expr3 )

Take the following code for example where we determine how to greet a user.


    if(isset($user)) {
        echo $user->name;
    } else {
        echo "Guest";
    }
?>

The code above is simple enough but let’s see how we can improve it by refactoring using a ternary operator.

 echo (isset($user)) ? $user->name : "Guest"; ?>

Update 1: There is a great collection of examples over at dzone.

Update 2: Found another nice tips and tricks post over at dzone.

Update 3: One more to check out.