php - PHP PDO 获取错误。rowcount = 1 但 fetchall 返回 false；

Question

我在使用简单的 select sql 查询时遇到了麻烦。使用 php PDO。

由于某种原因，rowcount 返回 1，但 fetch 和 fetchall 都返回 false；对我来说，这意味着执行失败或查询没有返回行数为 0 的结果。据我所知，我的 sql 语法很好。

这是sql查询

SELECT * FROM CustomerAddress WHERE ".CustomerAddress::custAddressID." = :".CustomerAddress::custAddressID." LIMIT 1

这是代码。

try{
        if($this->selectCustomerAddressStatement->execute(array(CustomerAddress::custAddressID => $addressID)))
        {
            if($this->selectCustomerAddressStatement->rowCount() == 1)
            {   
                $this->selectCustomerAddressStatement->closeCursor();
                if($temp = $this->selectCustomerAddressStatement->fetch())
                {
                    $customerAddress = new CustomerAddress($temp);
                    if($customerAddress->getCustAddressID() == $addressID)
                    {
                        return $customerAddress;
                    }else{
                        throw new Exception("The Customer Address Retrieved was not what was Asked.");
                    }
                }else{
                    throw new Exception("Failed to retrieve Result set.");
                }
            }else{
                throw new Exception("Statement Returned To Many Results.");
            }
        }else{
            throw new Exception("Failed to Execute Statement.");
        }
    }catch(Exception $e) {
        $this->selectCustomerAddressStatement->closeCursor();
        throw new Exception("Customers:: selectCustomerAddress - ".$e->getMessage());
    }

Answer 1

看起来问题是：

$this->selectCustomerAddressStatement->closeCursor();

..在行数之后被调用。关闭游标可能会释放语句的结果，这就是 fetching 什么也不返回的原因。完成获取数据后，将该调用移至末尾。