Database connection operation class

Database connection operation class

class mysql
{

 private $_link;


 public function __construct($dbhost,$dbuser,$dbpassword,$dbname,$charset='utf8')
 {
 $ this->_link = mysql_connect($dbhost,$dbuser,$dbpassword,true); /*Connect to database*/
 $this->_link or $this->errmsg('Can't connect to MySQL server! '); /*Whether the connection is successful*/
 if ($this->version() > '4.1') { /*Check the database version*/
 $this->query('set names '.$charset ); /*Set database encoding*/
 }
 mysql_select_db($dbname,$this->_link) or $this->errmsg('Can't select the database!'); /*Open the database*/
 }


 /*Perform database operations*/
 public function query($sql)
 {

 $result = mysql_query($sql,$this->_link);
 $result or $this->errmsg( 'Execute sql sentence error!');
 return $result;
 }


 /*Returns an array generated based on the rows obtained from the result set*/
 /*MYSQL_BOTH Gets an array containing both associative and numeric indexes (like mysql_fetch_array())*/
 /*MYSQL_ASSOC Gets an array that contains both associative and numeric indexes (like mysql_fetch_assoc())*/
 /*MYSQL_NUM Gets an array that contains both associative and numeric indexes (like mysql_fetch_row())*/
 public function fetch_array($result,$type = MYSQL_BOTH)
 {
 return mysql_fetch_array($result,$type);
 }

 /*Return the object generated based on the obtained row*/
 public function fetch_object($result )
 {
 return mysql_fetch_object($result);
 }

 /*Get the number of record rows affected by the previous MySQL operation*/
 public function affected_rows()
 {
 return mysql_affected_rows($this->_link);
 }

 /* Release the result memory*/
 public function free_result($result)
 {
 return mysql_free_result($result);
 }

 /* Get the number of rows in the result set*/
 public function num_rows($result )
 {
 return mysql_num_rows($result);
 }


 /* Get the number of fields in the result set*/
 public function num_fields($result)
 {
 return mysql_num_fields($result);
 }

 /* Get the ID generated by the previous INSERT operation*/
 public function insert_id()
 {
 return mysql_insert_id($this->_link);
 }

 /* Issue a mysql execution error*/
 private function errmsg($msg)
 {
 $message = 'A mysql error has occurred!';
 $message .= 'Error Number:'. mysql_errno($this->_link) .'';
 $message .= 'Error Description:'. $msg . mysql_error($this->_link ) .'';
 $message .= 'Error Time:'. date('Y-m-d H:i:s');
 exit($message);
 }


 /*Return the connection ID*/
 public function link_id()
 {
 return $this->_link;
 }


 /*Return the database server version*/
 public function version() {
 return mysql_get_server_info($this->_link);
 }


 /*Get the real IP address of the client*/
 function getip() {
 if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP" "), "unknown")) {
 $ip = getenv("HTTP_CLIENT_IP");
 } else
 if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown")) {
 $ ip = getenv("HTTP_X_FORWARDED_FOR");
 } else
 if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown")) {
 $ip = getenv("REMOTE_ADDR");
 } else
 if (isset ($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown")) {
 $ip = $_SERVER['REMOTE_ADDR'] ;
 } else {
 $ip = "unknown";
 }
 return ($ip);
 }


}