封装一个mysql类（ggshop）

接口

abstract class db{

//连接服务器

public abstract function connect($n,$u,$p);

//发送查询

protected abstract function query($sql);

//查询单个数据

public abstract function getone($sql);

//查询单行数据

public abstract function getrow($row);

//查询多行数据  自动执行insert/update语句

public abstract function autoexecute($table,$data,$act='insert',$where='');

}

 

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class mysql extends db{

private static $ins=null;

private $conn=null;

private $conf=array();

protected function __construct(){

$this->conf=conf::getins();

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

$this->select_db($this->conf->db);

$this->setchar($this->conf->char);

}

public function __destruct(){

}

public static function getins(){

if(!(self::$ins instanceof self)){

self::$ins=new self();

}

return self::$ins;

}

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

$this->conn=mysql_connect($h,$u,$p);

if(!$this->conn){

$err=new exception('连接失败');

throw $err;

}

}

public function select_db($db){

$sql='use '.$db;

$this->query($sql);

}

public function setchar($char){

$sql='set names '.$char;

return $this->query($sql);

}

public function query($sql){

$rs=mysql_query($sql,$this->conn);

log::write($sql);

return $rs;

}

public function
autoexecute($table,$arr,$mode='insert',$where='where 1 limit
1'){

 

if(!is_array($arr)){

return false;

}

if($mode=='update'){

$sql='update'.$table.'set';

foreach($arr as $k=>$v){

$sql.=$k."='".$v."',";

}

$sql=rtrim($sql,',');

$sql.=$where;

return $this->query($sql);

}

$sql='insert
into'.$table.'('.implode(',',array_keys($arr)).')';

$sql.='values(\'';

$sql.=implode("','",array_values($arr));

$sql.='\')';

}

public function getall($sql){

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

$list=array();

while($row=mysql_fetch_assoc($rs)){

$list[]=$row;

}

return $list;

}

public function getrow($sql){

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

return mysql_fetch_assoc($rs);

}

public function getone($sql){

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

$row=mysql_fetch_row($rs);

return $row[0];

}

// 返回影响行数的函数

public function affected_rows(){

return mysql_affected_rows($this->conn);

}

// 返回最新的auto_increment列的自增长的值

public function insert_id(){

return mysql_insert_id($this->conn);

}

}