Database connection operation class-PHP Tutorial-php.cn

Database connection operation class

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Release： 2016-07-25 09:11:41

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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);
}
}

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