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] => -10-23
[date] => -10-23
)
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