<?
/******************************************************************************
 * Name			:	Database
 * Description	:	Class for database connection
 *****************************************************************************/

class DBConnection
{
	var $m_host;			// hostname
	var $m_login;			// login (user name)
	var $m_password;		// password

	var $m_dbcn;			// database connection

	var $m_query;			// query

	function DBConnection()
	{
		// Set variables for connection
		$this->m_host = "localhost";
		$this->m_login = "httpd";
		$this->m_password = "pass";
		$this->m_database = "wavewatcher3";
	}	
	
	// Connects to the database
	function Connect()
	{
		// Connect to the database
		$this->m_dbcn = mysql_connect($this->m_host, $this->m_login, $this->m_password) or die("Could not connect to the database!");
		
		// Set database
		mysql_select_db("wavewatcher3", $this->m_dbcn) or die("Wavewatcher3 doesn't exist!");
	
		// Return database connection
		return $this->m_dbcn;
	}
	
	// Disconnects from the database, this isn't really nescessary since mysql closes it after a query
	function Disconnect()
	{
		if (IsSet($m_dbcn))
			mysql_close($m_dbcn) or die("Oups... Could not close database connection");
	}
	
	// Returns a reference to the database connection
	function GetConnection()
	{
		return $this->m_dbcn;
	}
	
	// Executes a query and returns the recordset
	function Query($query, $lock_array = FALSE)
	{
		/**********************************************************************
		* Parameters
		* ----------
		* $query		- Query to be executed
		* $lock_array	- An array of tables and lockingmodes
		*
		* Example:
		* Query("SELECT * FROM Users", array("users", "READ", "nodes", "WRITE"));
		**********************************************************************/

		// lock-query variable
		$strQuery = "";

		// resource identifier to return
		$resId = FALSE;

		// Is the second parameter an array => lock_array
		if (gettype($lock_array) == "array")
		{
			$strQuery = "LOCK TABLES ";

			// Step through list and generate the query
			for ($i = 0; IsSet($lock_array[$i]); $i++)
			{
				$strQuery = "$strQuery $lock_array[$i]";
				
				// Do we need any comma?
				if (IsSet($lock_array[$i+1]) && $i%2 == 1)
					$strQuery= "$strQuery,";
			}

			// Execute query and return the resource identifier
			if(mysql_query($strQuery, $this->m_dbcn))
				$resId = mysql_query($query, $this->m_dbcn);

			// unlock the table(s)
			mysql_query("UNLOCK TABLES", $this->m_dbcn);

			return $resId;
		}
		
		// Execute query without locks
		return mysql_query($query, $this->m_dbcn);
	}

	// Fetch row and return it
	function FetchRow($result)
	{
		return mysql_fetch_row($result);
	}

	// Move to a specified row in a resultset
	function DataSeek($result, $row)
	{
		if (!$result or $row < 0)
			return FALSE;

		return mysql_data_seek($result, $row);
	}
}  
?>