class Mysql {

private $host ;

private $user ;

private $pwd ;

private $dbName ;

private $charset ;

private $conn=null ;

public function __construct(){

$this->host = 'localhost' ;

$this->user = 'root' ;

$this->pwd = '' ;

$this->dbName = 'test' ;

//链接

$this->connect($this->host, $this->user, $this->pwd);

//切换库

$this->switchDb($this->dbName) ;

//设置字符集

$this->setChar($this->charset);

}

//负责连接数据库

private function connect($h, $u , $p){

$conn = mysql_connect($h, $u , $p);

$this->conn = $conn ;

}

//查询

public function query($sql){

return mysql_query($sql,$this->conn);

}

//切换数据库

public function switchDb($db){

$sql = 'use '.$db;

$this->query($sql);

}

//设置字符集

public function setChar($char){

$sql = 'set names '.$char;

$this->query($sql);

}

//返回多行多列结果

public function getAll($sql){

$list = array();

$rs = $this->query($sql) ;

if (!$rs)

{

return false;

};

while ( $row = mysql_fetch_assoc($rs) )

{

$list[] = $row ;

}

return $list ;

}

//获取一行的结果

public function getRow($sql){

$rs = $this->query($sql) ;

if (!$rs){

return false;

}

return mysql_fetch_assoc($rs) ;

}

public function getOne($sql){

$rs = $this->query($sql) ;

if (!$rs){

return false;

}

$row = mysql_fetch_row($rs) ;

return $row[0] ;

}

public function __destruct(){

mysql_close($this->conn);

}

}

$mysql = new Mysql();

//print_r($mysql);

/*

$sql = "insert into class values ('李四','20','90','80')" ;

if ( $mysql->query($sql)){

echo '查询成功哦！' ;

}

else

{

echo '查询失败哦！' ;

}

*/

echo '
' ;

$sql = 'select * from class' ;

$arr = $mysql->getAll($sql) ;

//print_r($arr) ;

$sql = 'select * from class where score = 0' ;

print_r($mysql->getRow($sql)) ;

$sql = 'select count(*) from class' ;

print_r($mysql->getOne($sql)) ;

?> 转自：燕十八