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Exception on execute() with prepared statements


Exception on execute() with prepared statements

By : user2955653
Date : November 22 2020, 10:40 AM
this will help Found the answer. According to this link, the solution is to encapsulate your field names. PHP PDO Syntax error or access violation: 1064 on insert
In the previous link, "desc" was a reserved keyword. In your case, "group" is a reserved word. http://dev.mysql.com/doc/refman/5.6/en/reserved-words.html
code :
$sql = "INSERT INTO `users` (`user_name`, `group`) VALUES (?, ?)";


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PHP, MySQL prepared statements - can you use results of execute more than once by calling data_seek(0)?

PHP, MySQL prepared statements - can you use results of execute more than once by calling data_seek(0)?


By : Ed. Urrutia
Date : March 29 2020, 07:55 AM
Does that help I found where this code was going wrong. It had nothing to do with my use of the prepared statement functions, just the placement of the data_seek. I sought help from SO a little too soon :)
The loop code that now works exactly as I wanted is as follows:
code :
while ($q1 = $outer_query->fetch_object()) {
    while ($stmt->fetch()) {
        if ($q1->field1 == $var1) { // looking for a match
            $obj = new stdClass();
            $obj->var1 = $var1;
            $obj->var2 = $var2;
            $obj_array[] = $obj;
            break;               // found match, so leave inner                
        }
    }
    $stmt->data_seek(0); // reset for outer loop
}
// this was always here, forgot it in original post
$outer_query->data_seek(0) // reset for next iteration of foreach
Can't execute prepared statements using nested while loops

Can't execute prepared statements using nested while loops


By : emawby
Date : March 29 2020, 07:55 AM
will help you You cannot prepare() a statement while the connection has rows waiting to be fetched from another statement. You must first either close the previous result set or fetch all rows from it.
However...
code :
echo "<h3>$location</h3><div>";
// Substitute a query() call and $day0 can be inserted directly.
// This one query fetches all locations sorted...
$query = $dbconn->query("
  SELECT
   COALESCE( CountDesk, 0 ) total,
   name,
   d.desk_id,
   phone,
   fax,
   dock,
   pc
 FROM 
   desk d
   LEFT JOIN (
     SELECT COUNT(booked.desk_id) CountDesk, desk_id FROM booked WHERE booking_id >= $day0
   )b ON d.desk_id = b.desk_id 
 ORDER BY location");

// Store the last location in a variable which starts empty...
$location = "";

while($row = $query->fetch_assoc()) {
  // on change of $location, update the variable.
  if ($location !== $row['location']) {
    $location = $row['location'];
    // And output the new location value
     echo "<h3>$location</h3><div>";
  }

  // Do the rest of your loop.
  $total = count($bookingTimes) * 14 - $row['total'];
  echo '<a href="?page=desk&desk='.$row['desk_id'].'"><div class="desk"><b>'.$row['name'].' 
  ('.$total.' Available Bookings)</b><li>Facilities:';
  if($row['phone']){
    echo " Phone,";
  }
  if($row['fax']){ 
    echo " Fax Machine,";
  }
  if($row['dock']){
    echo " Laptop Dock.";
  }
  if($row['pc']){
    echo " Desktop Workstation.";
  }
  echo '</li></div></a><hr />';
}
$row->close();
echo '</div>';
while ($row = $first_query->fetch()) {
  // Append all onto an array
  $first_query_rows[] = $row;
}
// Then loop over that
foreach ($first_query_rows as $row) {
  // Do a new query with $row
}
How to execute two different php prepared statements inside a foreach loop?

How to execute two different php prepared statements inside a foreach loop?


By : vinoth kanna
Date : March 29 2020, 07:55 AM
help you fix your problem Just like the comments above, I'd suggest another way and use CONCAT of MySQL built-in function instead of fetching all the rows from the first prepare:
code :
$updatecolumn = $link->prepare("UPDATE `table` SET `column` = CONCAT(`column`, ?) WHERE id = ?");
$updatecolumn->bind_param("si", $addedstring, $a_value);
$updatecolumn->execute();
Should I use bindParam(), bindValue(), or execute() for PDO prepared statements

Should I use bindParam(), bindValue(), or execute() for PDO prepared statements


By : Joshua Strickland
Date : March 29 2020, 07:55 AM
With these it helps Security wise, there is not a single problem with sending parameters into execute(). So, your concern is superfluous. Given strings are treated safely AND we are sending all our parameters as strings, we can logically conclude that all parameters are treated safely (note that I don't blame your question. It's always better to ask than sorry. I am just making things straight).
The only possible issue with treating all parameters as strings is on the database server side. Yet most database servers allow loose typing in SQL, means any data literal will be recognized and treated properly, despite being sent as a string. There are only few edge cases when it won't work. Here is an excerpt from my PDO tutorial on the matter:
PDO with Mulitple Update prepared statements failing to execute

PDO with Mulitple Update prepared statements failing to execute


By : user1992416
Date : March 29 2020, 07:55 AM
around this issue I am trying to construct a PDO multiple prepared statement that updates 2 tables.
code :
<?php
try {
$conn = new PDO('mysql:host=localhost;dbname=*', '*', '*');
$conn->exec("SET CHARACTER SET utf8");      // Sets encoding UTF-8
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$est_id = $_POST['est_id'];
$known_for = $_POST['known_for'];
$street_address = 'addressToAdd';

$sqlKnown = "UPDATE `theList` SET `known_for` = :known_for WHERE `id` = :est_id";
$stKnown = $conn->prepare( $sqlKnown );
$stKnown->execute([
  ':est_id' => $est_id,
  ':known_for' => $known_for,
]);

$sqlStreet = "UPDATE `est_address` SET `street_address` = :street_address WHERE `id` = :est_id";
$stStreet = $conn->prepare( $sqlStreet );
$stStreet->execute([
  ':est_id' => $est_id,
  ':street_address' => $street_address
]);

  $conn = null;        // Disconnect
}
catch(PDOException $e) {
  echo $e->getMessage();
}
?>
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