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POSyntax for ON DUPLICATE KEY UPDATE with positional placeholders
 

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  1. POSyntax for ON DUPLICATE KEY UPDATE with positional placeholders
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    <p>This is <code>REPLACE</code> syntax</p> <pre><code>$sql = "REPLACE INTO 2_1_journal (Number,RecordDay, RecordMonth) VALUES "; $insertQuery = array(); $insertData = array(); foreach ($_POST['row_id'] as $i =&gt; $row_id) { $insertQuery[] = '(?, ?, ?)'; $insertData[] = $row_id; $insertData[] = $_POST['date_day'][$i]; $insertData[] = $_POST['date_month'][$i]; } if (!empty($insertQuery)) { $sql .= implode(', ', $insertQuery); $stmt = $db-&gt;prepare($sql); $stmt-&gt;execute($insertData); } </code></pre> <p>However read that instead of <code>REPLACE</code> better use <code>ON DUPLICATE KEY UPDATE</code></p> <p>Trying to change like this</p> <pre><code>$sql = "INSERT INTO 2_1_journal (Number,RecordDay, RecordMonth) VALUES ON DUPLICATE KEY UPDATE (RecordDay, RecordMonth) "; $insertQuery = array(); $insertData = array(); foreach ($_POST['row_id'] as $i =&gt; $row_id) { $insertQuery[] = '(?, ?, ?, ?, ?)'; $insertData[] = $row_id; $insertData[] = $_POST['date_day'][$i]; $insertData[] = $_POST['date_month'][$i]; $insertData[] = $_POST['date_day'][$i]; $insertData[] = $_POST['date_month'][$i]; } if (!empty($insertQuery)) { $sql .= implode(', ', $insertQuery); $stmt = $db-&gt;prepare($sql); $stmt-&gt;execute($insertData); } </code></pre> <p>But does not work (neither inserts nor updates)</p> <p>What is incorrect?</p> <p>If downvote, please write in comments why (for me to avoid write things that cause downvote)</p> <p><strong>Update</strong></p> <p>Changed code to this</p> <pre><code>$sql = "INSERT INTO 2_1_journal (Number, RecordDay) VALUES ON DUPLICATE KEY UPDATE RecordDay"; $insertQuery = array(); $insertData = array(); foreach ($_POST['row_id'] as $i =&gt; $row_id) { $insertQuery[] = '(?, ?)'; $insertData[] = $row_id; $insertData[] = $_POST['date_day'][$i]; } </code></pre> <p>get SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ON DUPLICATE KEY UPDATE RecordDay('21', ''), ('22', '')' at line 1</p> <p>Changed to this</p> <pre><code>$sql = "INSERT INTO 2_1_journal (Number, RecordDay) VALUES ON DUPLICATE KEY UPDATE RecordDay=VALUES(Number)"; $insertQuery = array(); $insertData = array(); foreach ($_POST['row_id'] as $i =&gt; $row_id) { $insertQuery[] = '(?, ?)'; $insertData[] = $row_id; $insertData[] = $_POST['date_day'][$i]; </code></pre> <p>get SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ON DUPLICATE KEY UPDATE RecordDay=VALUES(Number)('21', ''), ('22', '')' at line 1</p> <p>Changed code to this</p> <pre><code>$sql = "INSERT INTO 2_1_journal (Number, RecordDay) VALUES ON DUPLICATE KEY UPDATE RecordMonth=?"; $insertQuery = array(); $insertData = array(); foreach ($_POST['row_id'] as $i =&gt; $row_id) { $insertQuery[] = '(?, ?, ?)'; $insertData[] = $row_id; $insertData[] = $_POST['date_day'][$i]; $insertData[] = $_POST['date_month'][$i]; </code></pre> <p>get SQLSTATE[HY093]: Invalid parameter number: number of bound variables does not match number of tokens</p> <p>Can I make conclusion that last example is valid SQL syntax. But why error? Number, RecordDay, RecordMonth=? and <code>$insertQuery[] = '(?, ?, ?)';</code> 3 variables and 3 tokens? Or I am wrong?</p> <p>If <code>$insertQuery[] = '(?, ?)';</code> the same SQLSTATE[HY093]: Invalid parameter number: number of bound variables does not match number of tokens</p> <p>Please, help. I am stuck.... no idea</p> <p><strong>Working code!!!</strong></p> <pre><code>try { $sql = "INSERT INTO 2_1_journal (Number, RecordDay) VALUES "; $insertQuery = array(); $insertData = array(); foreach ($_POST['row_id'] as $i =&gt; $row_id) { $insertQuery[] = '(?, ?)'; $insertData[] = $row_id; $insertData[] = $_POST['date_day'][$i]; } if (!empty($insertQuery)) { $sql .= implode(', ', $insertQuery) . 'ON DUPLICATE KEY UPDATE RecordDay = VALUES(RecordDay);'; $stmt = $db-&gt;prepare($sql); $stmt-&gt;execute($insertData); } } catch (PDOException $e){ echo "DataBase Error: " .$e-&gt;getMessage() .'&lt;br&gt;'; } catch (Exception $e) { echo "General Error: ".$e-&gt;getMessage() .'&lt;br&gt;'; } </code></pre> <p>Your comments, please. And see location of <code>ON DUPLICATE KEY UPDATE</code>!!!</p>
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    1. COHave you checked what your final query looks like before you put it in `prepare`? That simply doesn't add up to any sort of valid SQL query. And a reason for a downvote would be that you should experiment a lot more on your own, this is just about concatenating strings in the right order.
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      1. USdeceze
    2. COdo you have any error message received? if so, what was it?
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      1. USJohn Woo
    3. COAnd your Query is very prone to sql injections.. Put some of your time to make it a bit secure at least for novices or computer jeeks
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      1. USScoRpion
 

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