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Editorial Team
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Asked: 2026-05-25T06:35:33+00:00

i am using mysql_affected_rows() to check if i have to enter new record or

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i am using mysql_affected_rows() to check if i have to enter new record or update existing, but the problem is if the user tries to enter exactly same data as record which already exists it runs insert into. 

$result = mysql_query("update Data set Score='$score',Comment='$_POST[Comments]' where Date='$_POST[forDay_3]-$_POST[forDay_1]-$_POST[forDay_2]' AND User='$_POST[UserID]';");
$last = mysql_affected_rows();

if ($last==0) {

    $result1 = mysql_query("INSERT INTO Data (User,Date,Score,Comment) VALUES ('$_POST[UserID]','$_POST[forDay_3]-$_POST[forDay_1]-$_POST[forDay_2]','$score','$_POST[Comments]')");

what should i do to avoid redundant entries

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1 Answer

  1. Editorial Team
    1. You could parse mysql_info() output (but the solution itself will be affected by race condition issue)

    2. You could create unique key User + Date and end up with a single query using ON DUPLICATE KEY UPDATE syntax:

      INSERT INTO `Data` (User,Date,Score,Comment)
('$_POST[UserID]','$_POST[forDay_3]-$_POST[forDay_1]-$_POST[forDay_2]','$score','$_POST[Comments]')
ON DUPLICATE KEY UPDATE Score='$score',Comment='$_POST[Comments]'
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