Question

我将数据结果按字母顺序排序时，我很难将其与将其放入“Locker”中的用户进行匹配。

我有两个问题;第一个搜索数据库中的用户放置在“储物柜”中的所有项目，第二个查询提取项目的详细信息并将其分类到项目所依据的列表中。

我觉得有一种更好的方法可以做到这一点，而不是强迫页面为每个项目运行一次查询，但我不确定以最有效的方式写出mySQL的正确方法。

我认为解决方案是将所有ID作为数组提取，然后在第二个查询中以某种方式搜索和排序所有相关品牌。

我目前有：

    //$lockerid is pulled earlier in the code based on which locker number is associated with this user

    // Pull all of the items and their ids that are in this users locker
    $userlockerquery= mysql_query("SELECT DISTINCT item_id FROM lockers WHERE user_id = '$profile_userid' AND locker_id ='$lockerid' ");

    while($lockeritems=mysql_fetch_array($userlockerquery)){
            $indi_item=$lockeritems[item_id];
            $lockeritemdetails = mysql_query("SELECT DISTINCT brand FROM inventory WHERE id = '$indi_item' ");
            $brands=mysql_fetch_array($lockeritemdetails );
            $brandname=$brands[brand];
            echo '<div>'.$brandname.'</div>';
    }

虽然结果确实出现在所有品牌中，但我的问题似乎是因为查询是针对每个项目ID运行一次，所以它不能让列表结果相互通信，因此不能按顺序排列ASC按字母顺序排列，因为每个项目都运行一次查询。

同样正因为如此，DISTINCT标志没有任何效果，因为它与任何其他结果不匹配。

例如，我的结果将按ID而不是品牌的顺序返回div，并重复：

耐克美洲狮美洲狮相反

而不是

逆耐克彪马

将ORDER BY标志添加到第二个查询没有帮助，所以我想我会尝试在这里询问一些想法。如果需要任何其他细节，请告诉我们！

Answer 1

也许尝试这样的课程。看看它是否适合您的需求。如果不尝试sql查询，很难检查它，但如果我已正确编写它，它应该可以工作。

class MyLocker
        {
            // Protected means that you can't use this variable outside of the functions/class
            // so you can not use $myLocker->_array; It will throw an error
            protected $_array;
            // Construct is basically used as an auto-function. It will execute automatically
            // when you create a new instance of the class so as soon as you do this:
            // $myLocker = new MyLocker($_locker); you initiate the __construct
            // When you label as public, you allow it to be used outside of itself
            public function __construct($_array)
                {
                    // When you set this variable, it is now open to use in all
                    // other functions in this class.
                    $this->_array = $_array;
                }

            // This is the method that will do everything
            public  function LockerContents()
                {
                    // Loop through query. Since the $_array was set in the __construct
                    // it is available in this function as $this->_array
                    while($lockeritems = mysql_fetch_array($this->_array)){
                            // $brand is something we want to use in other functions but not
                            // outside the class so it is set here for use in the Fetch() function
                            $this->brand    =   $lockeritems['item_id'];
                            // We ant to use our Fetch() function to return our brand
                            $_brand         =   $this->Fetch();
                            // If brand available, set it to an array
                            if(!empty($_brand))
                                $array[]    =   $_brand;
                        }
                    if(isset($array)) { 
                            // Sort the array
                            asort($array);
                            // Finally, we use the Display() function for the final output
                            $this->Display($array);
                        }
                    else { ?>
                            <div>Locker is empty.</div><?php
                        }
                }
            // Establish this as an in-class variable
            protected   $brand;
            // Establish this as a public function incase we want to use it by itself
            // To do so you would write $myLocker->Fetch(); outside of the class.
            // Since you need $brand for this function to work, you would need to turn
            // $brand from "protected" to "public" and write $myLocker->brand = 'whatever';
            // before you run the $myLocker->Fetch();
            public  function Fetch()
                {
                    $query  =   mysql_query("SELECT DISTINCT brand FROM inventory WHERE id = '".$this->brand."'");
                    $brands =   mysql_fetch_array($query);
                    // Return brand
                    return  (isset($brands['brand']))? $brands['brand']:"";
                }

            protected   function Display($array)
                {
                    if(is_array($array)) {
                            foreach($array as $object) { ?>
                                <div><?php echo $object; ?></div><?php
                                }
                        }
                }
        }

    // You should be using mysqli_ or PDO for your db connections/functions.
    $_locker    =   mysql_query("SELECT DISTINCT item_id FROM lockers WHERE user_id = '$profile_userid' AND locker_id ='$lockerid' ");

    // If there are more than 0 rows, create locker.
    if(mysql_num_rows($_locker) > 0) {
            // Create new instance of the locker app
            $myLocker   =   new MyLocker($_locker);
            // Display the results
            $myLocker->LockerContents();
        }

多个查询时按字母顺序排序？

1 个答案: