Question

下面是我非常基本的代码。我需要帮助，因为有时我的声明会更新两次。

$queryCS="Select * FROM coin_market_sell";
$resultCS=mysql_query($queryCS);
while($rowCS=mysql_fetch_array($resultCS)){
  $cms_id=$rowCS['cms_id'];
  $cms_by=$rowCS['cms_by'];
  $cms_coin_amount_balance=$rowCS['cms_coin_amount_balance'];
  $cms_coin_id=$rowCS['cms_coin_id'];
  $wallet_amountnew=0;

  $queryCOIN2="Select * FROM wallet WHERE user_id=$cms_by and currency_id=$cms_coin_id";
  $resultCOIN2=mysql_query($queryCOIN2);
  while($rowCOIN2=mysql_fetch_array($resultCOIN2)){
    $wallet_id=$rowCOIN2['wallet_id'];
    $wallet_amount=$rowCOIN2['wallet_amount'];
    $wallet_amountnew=$wallet_amount+$cms_coin_amount_balance;
  }

  mysql_query("UPDATE wallet SET wallet_amount='$wallet_amountnew' WHERE wallet_id='$wallet_id'");
  mysql_query("DELETE FROM `coin_market_sell` WHERE `coin_market_sell`.`cms_id` = $cms_id");
}

Answer 1

我不是百分百想要尝试的东西，但是我认为UPDATE陈述必须在内部循环之内：

 $queryCOIN2="Select * FROM wallet WHERE user_id=$cms_by and currency_id=$cms_coin_id";
  $resultCOIN2=mysql_query($queryCOIN2);
  while($rowCOIN2=mysql_fetch_array($resultCOIN2)){
    $wallet_id=$rowCOIN2['wallet_id'];
    $wallet_amount=$rowCOIN2['wallet_amount'];
    $wallet_amountnew=$wallet_amount+$cms_coin_amount_balance;
    mysql_query("UPDATE wallet SET wallet_amount='$wallet_amountnew' WHERE wallet_id='$wallet_id'");

  }

顺便说一句：使用过期的mysql_* API，停止。移至mysqli_*或PDO

为什么有时mysql将更新两次

1 个答案: