两次调用一个类的函数有问题！ [英] Problem with call a function of a class twice!

问题描述

大家好！
我建立了2个班级:
1，数据库

hi every one!
I have built 2 classes:
1, DB

class DB extends MySQLi{
    function getRecordSet($sql){
       ...
       //Return record set
    }
}

2，部门

2, Department

class Department{
    var $db;
    function getDepartment(){
        return $this->db->getRecordSet('...');
    }
}

问题:

Problem:

$dept=new Department();
$db=new DB();
$dept->db=$db;
//Problem
$department=$dept->getDepartment();
$department2=$dept->getDepartment();

我的问题是变量$ department具有记录集，但是$ department2是bool(false).我用这个是因为我需要两次使用部门.

注意:我已经测试了存储部门第一次使用另一个属性，但是无法获取的另一种方法.
请帮帮我！
谢谢！

My problem is that variable $department has record set, but $department2 is bool(false). I use this because I need to use departments twice.

Note: I already test another way that store departments getting the first time in another attribute, but cannot fetch.
Please help me!
Thanks!

推荐答案

sql){ ... // 返回记录集 } }

sql){ ... //Return record set } }

2，部门

2, Department

class Department{
    var 

db ; 函数getDepartment(){ 返回

db; function getDepartment(){ return

this-> db-> getRecordSet(' ...')； } }

this->db->getRecordSet('...'); } }

问题:

Problem:

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