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/**
* A "driver" for mySQL databases
* Contains code for connecting, inserting, selecting and
* generally doing lots of stuff to the database. By doing
* this you have an easy, single point of access for dealing
* with mySQL functions, and can also count the number of queries
* used per instance of this class. It has let me tidy up my code
* no end.
* To use it, instantiate the class and call ::db_connect(), eg:
* $sql = new sql_driver();
* $sql->db_connect();
*/
class sql_driver
{
/**
* Connection details array
*/
var $conn_details = array(
'db_db' => 'DATABASE_NAME',
'db_user' => 'USER_NAME',
'db_pass' => 'PASSWORD',
'db_host' => 'localhost',
'db_port' => '',
);
/**
* Whether or not to use persistant connections (1=yes, 0=no)
*/
var $persistant = 0;
/**
* Connection identifier
*/
var $conn = '';
/**
* Result identifier
*/
var $result = '';
/**
* Number of queries performed
*/
var $query_count = 0;
/**
* Result row
*/
var $result_row = array();
/**
* Connects to the database
*
* @return void
*/
function db_connect()
{
if ($this->persistant)
{
$this->conn = @mysql_pconnect( $this->conn_details['db_host'],
$this->conn_details['db_user'],
$this->conn_details['db_pass']);
}
else
{
$this->conn = @mysql_connect( $this->conn_details['db_host'],
$this->conn_details['db_user'],
$this->conn_details['db_pass']);
}
if (!$this->conn)
{
echo 'Error: unable to connect to database server.';
}
if (!@mysql_select_db($this->conn_details['db_db'], $this->conn))
{
echo 'Error: unable to connect to specified database.';
}
}
/**
* Carries out query
*
* @return resource mySQL result resource
*/
function query($query)
{
$this->result = mysql_query($query, $this->conn);
$this->query_count++;
return $this->result;
}
/**
* Returns an associative array of each row
*
* Returns an associative array of a row from the result in parameters. If no
* parameter is present, it returns a row from the last result.
*
* @return array An array of the fetched row.
*/
function get_row()
{
$this->result_row = array();
$this->result_row = mysql_fetch_assoc($this->result);
return $this->result_row;
}
/**
* Returns the number of rows in a result
*
* @return integer Number of rows in the result.
*/
function get_num_rows()
{
return mysql_num_rows($this->result);
}
/**
* Returns the number of rows affected by the last insert, update or delete query.
*
* The PHP manual says that this will not be reliable if the updated value is the
* same as the pre-update value.
*
* @return integer The number of affected rows.
*/
function get_affected_rows()
{
return mysql_affected_rows($this->conn);
}
/**
* Returns the number of queries performed.
*
* @return integer The number of queries performed.
*/
function get_query_count()
{
return $this->query_count;
}
/**
* Frees the result resource from memory
*/
function free_result()
{
mysql_free_result($this->result);
}
/**
* Closes the mySQL connection
*/
function db_close()
{
mysql_close($this->conn);
}
}
// End sql_driver class
?> | |
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