PHP的MySQL fetch语句获取问题

我有一个问题我的脚本有三个mysql_query应后相互使用，我想创建一个脚本，预订门票通过改变他们的身份售出=“无”到“有” ，该脚本计算用户在html表单上输入的票数，该表单向服务器端提供了一个变量，其中包含票数= $tickets。PHP的MySQL fetch语句获取问题

提示：这是这样一个模型，以便无需MySQL的注射安全

这里是我的代码：

//get ticket status 
    $eventTicket = mysql_query("SELECT eventTickets FROM beventreservation WHERE eventId = '$eventId'") or die(mysql_error()); 
    $ticketrow = mysql_fetch_array($eventTicket) or die(mysql_error()); 


    //test... which is working ! 
    echo $ticketrow['eventTickets']; 


    //get classId from classes 
    $selectClass = mysql_query("SELECT classId FROM quotaclasses WHERE className = '$classes' AND eventFK = '$eventId'") or die (mysql_error());  

    $classrow = mysql_fetch_array($selectClass) or die(mysql_error()); 

    //this var is to define which class the user used 
    $choosedClass = $classrow['classId']; 

//test ... which did not work !!! 
echo $classrow['classId']; 

     if ($ticketrow['eventTickets'] == "Yes") 

    { 
     for($counter=1;$counter<$numberOfTickets;$counter++) 

     { 
      $bookTicket = mysql_query("UPDATE unites SET ticketSold = 'Yes' WHERE businessreservationIdFk = '$eventId' AND classIDfk ='$choosedClass'") or die(mysql_error()); 
      echo "ticket ". $counter . " done !"; 


     } 

    }

脚本不取此语法，并没有错误显示在我的页面上！

$classrow = mysql_fetch_array($selectClass) or die(mysql_error());

还，我想这句法后呼应变量$tickets，它没有露面，有没有要读取的mysql_query多个相同的脚本页面上的问题吗？请告诉我，我在哪里错了。

来源

2012-04-28 Bader H Al Rayyes

不要用mysql_fetch_*()电话呼叫die()结合。如果没有返回行，mysql_fetch_array()返回FALSE，这将触发你的die()并杀死即使没有错误的脚本。既然你已经穿上错误上$selectClass在mysql_query()电话检查，你知道它已经成功了。

// This query returned no rows, but was successful syntactically and functionally. 
$selectClass = mysql_query("SELECT classId FROM quotaclasses WHERE className = '$classes' AND eventFK = '$eventId'") or die (mysql_error());

相反，测试，如果被返回的行：

if (mysql_num_rows($selectClass) > 0) { 
    // Fetch and do other stuff 
    $classrow = mysql_fetch_array($selectClass); 
    $choosedClass = $classrow['classId']; 
    // etc... 
    // etc... 
} 
else { 
    // Do whatever you need to do if no rows return 
}

来源

2012-04-28 12:41:30

PHP的MySQL fetch语句获取问题

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