science-ation/db/db_update.php

<?
if(file_exists("db.code.version.txt"))
{
	$dbcodeversion_file=file("db.code.version.txt");
	$dbcodeversion=trim($dbcodeversion_file[0]);
}
else
{
	echo "Couldnt load current db.code.version.txt\n";
	exit;
}

if(file_exists("db.db.version.txt"))
{
	$dbdbversion_file=file("db.db.version.txt");
	$dbdbversion=trim($dbdbversion_file[0]);
}
else
{
	echo "Couldnt load current db.db.version.txt - assuming version is 1\n";
	$dbdbversion=1;
}

if($dbcodeversion && $dbdbversion)
{
	//lets see if they match
	if($dbcodeversion == $dbdbversion)
	{
		echo "DB and CODE are all up-to-date.  Version: $dbdbversion\n";
		exit;
	}
	else if($dbcodeversion<$dbdbversion)
	{
		echo "ERROR: dbcodeversion<dbdbversion ($dbcodeversion<$dbdbversion).  This should not happen!";
		exit;

	}
	else if($dbcodeversion>$dbdbversion)
	{
		echo "DB update requirements detected\n";
		echo "Current DB Version: $dbdbversion\n";
		echo "Current CODE Version: $dbcodeversion\n";
		//first, make sure we have write access to the db.db.version.txt
		//otherwise, we will not be able to save the new version number
		//which would screw things up.
		if(is_writable("db.db.version.txt"))
		{
			echo "Updating database from $dbdbversion to $dbcodeversion\n";
			//include the config.inc.php
			//so we have the db connection info
			require("../data/config.inc.php");

			for($ver=$dbdbversion+1;$ver<=$dbcodeversion;$ver++)
			{
				if(file_exists("db.update.$ver.sql"))
				{
					echo "db.update.$ver.sql detected - running...\n";
					readfile("db.update.$ver.sql");
					echo "\n";
					system("mysql -h$DBHOST -u$DBUSER -p$DBPASS $DBNAME <db.update.$ver.sql");
				}
				else
				{
					echo "Version $ver update file not found - skipping over\n";
				}
			}
			echo "\nAll done - updating new DB version to $dbcodeversion\n";
			$fp=fopen("db.db.version.txt","w");
			fputs($fp,$dbcodeversion."\n");
			fclose($fp);
		}
		else
		{
			echo "ERROR: cannot perform upgrade.   db.db.version.txt is not writeable";
		}
	}

}
else
{
	echo "ERROR: dbcodeversion and dbdbversion are not defined\n";
}


?>