检查条件的功能

Question

编辑：这是我的函数中的一个错字导致了我的问题。我输入了 $sytem 而不是 $syStem。

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我正在尝试将这段代码变成一个函数。

我正在检查客户的最后状态记录。如果每条记录在Delay 中都有一个 0，那么它就是成功的。如果一条或多条记录不为 0，则为失败。

但是，当每个客户在Delay 中的数字不是 0 时，我都获得了成功。我做错了什么？

<?php
    //Shows if one or more replications have a delay
    function delay_total($conn, $customer, $sytem){
        $sql_customer       = "SELECT Cust_ID, Cust_Name, Env_Lines FROM `Customer` WHERE Cust_Name = '$customer' LIMIT 0,1";
        //echo $sql_customer;
        $customer_selection = mysqli_query($conn,$sql_customer);
        $customer_row       = mysqli_fetch_assoc($customer_selection);
        $env_lines          = $customer_row["Env_Lines"];
        $cust_id            = $customer_row["Cust_ID"];
        //echo $cust_id;
        $sql_last_records   = "SELECT Delay FROM $system WHERE Cust_ID = $cust_id ORDER BY Time DESC LIMIT $env_lines";
        //echo $sql_last_records;
        $record_selection   = mysqli_query($conn, $sql_last_records);               

        $count = 0;
        while($source_row = mysqli_fetch_array($record_selection)){
          if ($source_row['Delay'] == 0 ) {
              $count++;
          }
        }
        if($count != mysqli_num_rows($record_selection)) {
          echo "Fail";
        } else echo "Success";
    }

    ?>

gist.github.com/R2D2-05/da1cc473a68dccc3be35

Answer 1

我认为，如果您的查询返回零记录，那么您也将获得成功（因为$count 等于 0 也等于 0 记录。

您可以通过验证至少找到一条记录来解决此问题，更改：

if($count != mysqli_num_rows($record_selection)) {

到

if($count != mysqli_num_rows($record_selection) || mysqli_num_rows($record_selection) == 0) {

Answer 2

什么是 $system？是你的桌子还是什么？或者你有延迟表

最好使用联接或内部联接来获得它。是这样的

SELECT Customer.Cust_ID, Customer.Cust_Name, Customer.Env_Lines,
FROM Customer
INNER JOIN Delay
ON Customer.Cust_ID=$system.Cust_ID
WHERE Customer.Cust_Name = '$customer';