简单的数据库链式操作的例子

<?php

/*

@author Dishy

数据库封装

*/

class mysqldb{

private $host;
private $username;
private $password;
private $dbname;
private $sql;
private $select = true;
private $result;
private $array;

public function __construct($host,$username,$password,$dbname){
$this->host = $host;
$this->username = $username;
$this->password = $password;
$this->dbname = $dbname;
$this->dbconnect();

}
/*
数据库连接
*/
private function dbconnect(){
mysql_connect($this->host,$this->username,$this->password);
mysql_select_db($this->dbname);

}
/*
*执行sql语句
*
**/
public function query($sql){
$this->sql = $sql;
$this->result = mysql_query($this->sql);
return $this;
}
/*
*
*$select = false时输出sql语句
*/
public function select($select= true){
$this->select = $select;
if($this->select){
return $this->array =  $this->result();
}else{
return $this->sql;
}
}
/**
*结果集
*/
private function result(){
$array = mysql_fetch_array($this->result);
return $array;
}

}

?>

使用方法

include “./Api/datebase.php”;

define('DB_HOST_NAME','localhost');

define('DB_HOST_USERNAME','root');

define('DB_HOST_PASSWORD','root');

define('DB_HOST_DB','jciot');

$Jciot_db = new mysqldb(DB_HOST_NAME,DB_HOST_USERNAME,DB_HOST_PASSWORD,DB_HOST_DB);

$a = $Jciot_db->query('select * from

jciot_member

')->select();

var_dump($a);

?>`