防止从 php mysql 数据库中一遍又一遍地选择相同的数据答案

【问题标题】：Preventing selecting the same data over and over again from a php mysql database防止从 php mysql 数据库中一遍又一遍地选择相同的数据
【发布时间】：2016-06-14 19:50:45
【问题描述】：

我下面的代码应该从 db 中选择数据，然后使用变量发送 SMS。我正在使用 cron 作业来执行脚本。问题是，当 cron 运行时，它还会选择已经处理过的数据。有人请指导我如何防止选择已经处理过的数据......

    //should select the fresh or new data after the first run
    $sql = "SELECT name, amount, trans_id, msisdn, time_paid FROM customer";


    $result1 = mysqli_query($conn, $sql);
    $resultarr = mysqli_fetch_assoc($result1); // fetch data


            $name = $resultarr['name'];
            $amount = $resultarr['amount'];
            $transaction_id = $resultarr['trans_id'];
            $date = $resultarr['time_paid'];

             //message template
            $message = "Dear $name we have received $amount from you. MPESA transaction Id $transaction_id on $date.";

        $mobilenumber = $resultarr['msisdn']; // get mobile number from array
        $message_sent = $message;

            $serviceArguments = array(
                            "mobilenumber" => $mobilenumber,
                            "message" => $message_sent
            );

            $client = new SoapClient("http://32.138.160.130:8080/smsengine/smsws?WSDL");

【问题讨论】：

在表格中添加一列，说明是否已发送 SMS，并添加 WHERE thisNewColumn = false 或类似名称。
你好。我该怎么做呢？我的表中有一个状态列，我该怎么做？请... @JonStirling

标签： php mysql cron

【解决方案1】：

为短信状态添加新列。与 sms_sent 一样，此列的默认值为 0，当成功发送 sms 时，将 sms_sent 值从 0 更改为 1。然后sql查询是： $sql = "SELECT name, amount, trans_id, msisdn, time_paid FROM customer WHERE sms_sent= 0";

    //should select the fresh or new data after the first run
    $sql = "SELECT id, name, amount, trans_id, msisdn, time_paid FROM customer";


    $result1 = mysqli_query($conn, $sql);
    $resultarr = mysqli_fetch_assoc($result1); // fetch data


            $name = $resultarr['name'];
            $amount = $resultarr['amount'];
            $transaction_id = $resultarr['trans_id'];
            $date = $resultarr['time_paid'];

             //message template
            $message = "Dear $name we have received $amount from you. MPESA transaction Id $transaction_id on $date.";

        $mobilenumber = $resultarr['msisdn']; // get mobile number from array
        $message_sent = $message;

            $serviceArguments = array(
                            "mobilenumber" => $mobilenumber,
                            "message" => $message_sent
            );

            $client = new SoapClient("http://32.138.160.130:8080/smsengine/smsws?WSDL"); 
$sq = "UPDATE customer SET notification = 1 WHERE id = $resultarr['id']";

【讨论】：

谢谢。假设我在桌子上的“0”列设置了“通知”，我应该有...$sql = "SELECT name, amount, trans_id, msisdn, time_paid FROM customer WHERE notification = 0";，然后在发送短信后我应该有$sq = "UPDATE customer SET notification = 1 WHERE notification = 0"; 对吗？那么在插入一些其他数据后，通知集是否会恢复为 0 以便我可以选择？请......@Kuldeep
@Bob Myles 不喜欢那样 "$sq = "UPDATE customer SET notification = 1 WHERE notification = 0";"每次短信发送后更新表，并借助该表的唯一 ID（主键）进行更新。
好吧，和我的情况一样，主键是“id”……我没让你好，请详细说明
使用下面的 sql 查询 $sql = "SELECT id, name, amount, trans_id, msisdn, time_paid FROM customer" 获取数据的 ID；在特定的“id”上使用下面的 sql 查询更新表 $sq = "UPDATE customer SET notification = 1 WHERE id = $resultarr['id']";