Question

我有一个函数，首先检查是否存在行，如果不存在则插入数据。如果有任何失败，它应该返回false。当我运行该函数并使用var_dump检查返回时，它返回true。我假设数据已插入数据库，但事实并非如此。它为什么要这样做？我的功能有问题吗？

function add_tier ($mysqli, $project_id, $tier_number, $wanted, $in_return, $limit) {

    if ($result = $mysqli->query("SELECT COUNT(tier_id) FROM `tier` WHERE `project_id` 
    = $project_id AND `tier_number` = $tier_number")){

      if ($return < 1) {

        if ($stmt = $mysqli->prepare("INSERT INTO `tier` (`project_id`, 
        `tier_number`, `wanted`, `in_return`, `limit`) VALUES (?, ?, ?, ?, ?)")){

        $stmt->bind_param('iissi', $project_id, $tier_number, $wanted, $in_return, 
        $limit);

        $return = $stmt->execute();

        $stmt->close();

        return $return;

        } else {return false;}      

      } else {return false;}            

    }  else {return false;}

}

Answer 1

（继续评论）您似乎没有在任何地方定义此行中的$return：

if ($return < 1) {

插入返回True但未插入数据

1 个答案: