面向对象设计的PHP面向对象实例

class MySql {
var $user,$pass,$host,$db;
var $id,$data,$fields,$row,$row_num,$insertid,$version,$query_num=0;
function __construct($host,$user,$pass,$db)
{
$this->host = $host;
$this->pass = $pass;
$this->user = $user;
$this->db = $db;
$this->dbconnect($this->host, $this->user, $this->pass);
$this->selectdb($this->db);
if($this->version() >'4.1')
mysql_query(SET NAMES utf8);
}
function dbconnect($host,$user,$pass)
{
$this->id = @ mysql_connect($host,$user,$pass) OR
sysMsg(连接数据库失败,可能是mysql数据库用户名或密码错误);
}
function selectdb($db)
{
@ mysql_select_db($db,$this->id) OR die(未找到指定数据库);
}
function query($sql)
{
$query = @ mysql_query($sql,$this->id) OR die(SQL语句执行错误：$sql <br />.$this->geterror());
$this->query_num();
return $query;
}
function fetch_array($query)
{
$this->data = @mysql_fetch_array($query);
return $this->data;
}
function query_num()
{
$this->query_num++;
}
function num_fields($query)
{
$this->fields = @mysql_num_fields($query);
return $this->fields;
}
function fetch_row($query)
{
$this->row = @mysql_fetch_row($query);
return $this->row;
}
function num_rows($query)
{
$this->row_num = @mysql_num_rows($query);
return $this->row_num;
}
function insert_id()
{
$this->insertid = mysql_insert_id();
return $this->insertid;
}
function version()
{
$this->version = mysql_get_server_info();
return $this->version;
}
function fetch_one_array($sql)
{
$query = $this->query($sql);
$this->data = $this->fetch_array($query);
return $this->data;
}
function geterror()
{
return mysql_error();
}
}