php调用mysql数据 dbclass类

复制代码 代码如下:
class dbClass{ //开始数据库类
var $username;
var $password;
var $database;
var $hostname;
var $link;
var $result;

function dbClass($username,$password,$database,$hostname="localhost"){
$this->username=$username;
$this->password=$password;
$this->database=$database;
$this->hostname=$hostname;
}

function connect(){ //这个函数用于连接数据库
if(!$this->link=mysql_connect($this->hostname,$this->username,$this->password))
$this->halt("Sorry,can not connect to database");

if($this->version() > '4.1') {
global $dbcharset,$charset;
if(!$dbcharset && in_array(strtolower($charset), array('gbk', 'big5', 'utf-8'))) {
$dbcharset = str_replace('-', '', $charset);
}
if($dbcharset) {
mysql_query("SET character_set_connection=$dbcharset, character_set_results=$dbcharset, character_set_client=binary");
}
}
if($this->version() > '5.0.1') {
mysql_query("SET sql_mode=''");
}

return $this->link;
}

function select(){ //这个函数用于选择数据库
mysql_select_db($this->database,$this->link);
}

function query($sql){ //这个函数用于送出查询语句并返回结果，常用。
if($this->result=mysql_query($sql,$this->link)) return $this->result;
else {
$this->halt("SQL语句错误： $sql

错误信息： ".mysql_error());
return false;
}
}


function getarray($result){
return @mysql_fetch_array($result);
}


function getfirst($sql){
return @mysql_fetch_array($this->query($sql));
}


function getcount($sql){
return @mysql_num_rows($this->query($sql));
}


function update($sql){
return $this->query($sql);
}


function insert($sql){
return $this->query($sql);
}

function getid(){ //这个函数用于取得刚插入行的id
return mysql_insert_id();
}

function num_rows($query) {
$query = mysql_num_rows($query);
return $query;
}

function num_fields($query) {
return mysql_num_fields($query);
}

function free_result($query) {
return mysql_free_result($query);
}

function version() {
return mysql_get_server_info();
}

function close() {
return mysql_close();
}

function halt($message = '') {
return $message;
}
}

$db=new dbClass("$db_username","$db_password","$db_database","$db_hostname");
$db->connect();
$db->select();