本文实例为大家分享了php封装一个简单的数据库操作类，供大家参考，具体内容如下

一、代码

class conndb{

private $local;

private $username;

private $pwd;

private $db;

private $connid;

private $code;

public function __construct($local,$username,$pwd,$connid,$code,$db){

$this->local=$local;

$this->username=$username;

$this->pwd=$pwd;

$this->connid=$connid;

$this->code=$code;

$this->db=$db;

$this->connect();

}

public function connect(){

if($this->connid=="pconn"){

$this->connid=mysql_pconnect($this->local,$this->username,$this->pwd)or die("connect mysql false");

}else{

$this->connid=mysql_connect($this->local,$this->username,$this->pwd)or die("connect mysql false");

}

mysql_select_db($this->db,$this->connid) or die("connect db false");

mysql_query("set names $this->code");

return $this->connid; //返回数据库连接对象

}

}

class admindb{

function executesql ($sql, $connid){

$sqltype = strtolower(substr(trim($sql), 0, 6)); //提取sql语句的类型

$rs = mysql_query($sql,$connid); //执行sql语句

if ($sqltype == 'select') { //如果是select查询

$arraydata = mysql_fetch_array($rs); //返回查询记录集

if (count($arraydata) == 0 || $rs == false) { //如果没查询到或发生错误

return false; //返回false

} else { //否则

return $arraydata; //返回记录集

}

} elseif ($sqltype == 'insert' || $sqltype == 'update' || $sqltype == 'delete') { //如果执行插入、更新或删除语句

return $rs; //返回语句执行状态，即成功返回true，失败返回false

} else {

return false; //如果不是上述查询，则返回false

}

}

}

$connobj=new conndb("localhost","root","root","conn","utf8","db_database20"); //实例化数据库连接类

$conn=$connobj->connect(); //返回连接标识

$admindb=new admindb(); //数据库操作类实例化

$res=$admindb->executesql ("select * from tb_demo01",$conn); //调用数据库操作类中方法执行查询语句

if($res){ //如果返回结果为真，则输出数据

print_r($res); //输出一个数组。

}

?>

二、运行结果

array

(

[0] => 1

[id] => 1

[1] => php新书上市

[title] => php新书上市

[2] => php新书上市啦，希望大家给出宝贵意见

[content] => php新书上市啦，希望大家给出宝贵意见

[3] => 2010-10-23

[date] => 2010-10-23

)

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持萬仟网。

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