Question

我们已使用以下代码避免在数据库中插入重复的小肠但在某些情况下不起作用

  $device_id = $_REQUEST['device_id'];
$fcm_id = $_REQUEST['fcm_id'];
$model_number = $_REQUEST['model_number'];
$os_version = $_REQUEST['os_version'];
$app_version = $_REQUEST['app_version'];
$created = round(microtime(true) * 1000);

if(isset($device_id)){
    $exist = mysqli_query($con, "SELECT * FROM `user` WHERE `device_id`='$device_id'");
    if(mysqli_num_rows($exist)>0){
        mysqli_query($con, "UPDATE `user` SET `fcm_id`='$fcm_id', `topics`=0 WHERE `device_id`='$device_id'");
    }
    else{
        mysqli_query($con, "INSERT INTO `user` (`device_id`, `fcm_id`, `model_number`, `os_version`, `created`) VALUES ('".$device_id."', '".$fcm_id."', '".$model_number."', '".$os_version."', '".$created."')");
    }

Answer 1

尝试

  $device_id = $_REQUEST['device_id'];
  $fcm_id = $_REQUEST['fcm_id'];
  $model_number = $_REQUEST['model_number'];
  $os_version = $_REQUEST['os_version'];
  $app_version = $_REQUEST['app_version'];
  $created = round(microtime(true) * 1000);

  if(isset($device_id)){
    $stmt = $con->prepare("INSERT IGNORE INTO `user` (`device_id`, `fcm_id`,
       `model_number`, `os_version`, `created`) VALUES (?, ?, ?,?,?)");
    $stmt->bind_param($device_id, $fcm_id, $model_number, $os_version, $created );
    if ($stmt->execute()) {
    }
    $stmt->close();
  }

更新：将以下索引添加到您的tabekl中，但是您应该考虑一下放入索引中的内容。因为只有当所有4列相同时，不会创建新条目。

    CREATE UNIQUE INDEX idx_insert_user 
    ON user (`device_id`, `fcm_id`,
       `model_number`, `os_version`);

insertignore不会在表中输入重复项

Answer 2

尝试

$device_id = $_REQUEST['device_id'];
$fcm_id = $_REQUEST['fcm_id']; 
$model_number = $_REQUEST['model_number'];
$os_version = $_REQUEST['os_version'];
$app_version = $_REQUEST['app_version'];
$created = round(microtime(true) * 1000);

if(isset($device_id))
{
    $qry="UPDATE `user` SET `fcm_id`='$fcm_id', `topics`=0 WHERE EXISTS (SELECT * FROM `user` WHERE `device_id`='$device_id')";
    if(!mysqli_query($con,$qry)){ mysqli_query($con, "INSERT INTO `user` (`device_id`, `fcm_id`, `model_number`, `os_version`, `created`) VALUES ('".$device_id."', '".$fcm_id."', '".$model_number."', '".$os_version."', '".$created."')");
    }

Answer 3

用于在插入查询时从mysql数据库停止行上的重复数据： MySQL INSERT IGNORE statement

对于更新案例，您需要将条件进行重复处理。

停止在我的数据库中插入重复的小肠

3 个答案: