PHP PDO Update: SQLSTATE[HY093]: Invalid parameter number: parameter was not defined

Question

I know this problem came multiple times, but i cannot find the mistake in my code. In my update-branch every $stmt->bindValue(...) returns TRUE, but i catch the pdo exception

SQLSTATE[HY093]: Invalid parameter number: parameter was not defined

Inserting a new entry works fine.

In my mysql-database the structure of table 'system' is:

id -> int(11), primary key
computer_name -> varchar(255)
cpu_speed -> int(11)
ram_size -> int(11)
mac_address -> varchar(255)
operating_system -> varchar(255)

My error-throwing code:

// Search for mac_address.
// If an entry with the same MAC exists update the entry.
// Else, create a new entry
$stmt = $pdo->prepare("SELECT * FROM system WHERE mac_address=:mac");
$stmt->bindValue(":mac", $mac_address, PDO::PARAM_STR);
$stmt->execute();
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);

// If no rows are returned, no entry exists => create a new one
if(empty($rows))
{  
  // Prepare statement
  $stmt = $pdo->prepare("INSERT INTO
       system(`computer_name`,`cpu_speed`,`ram_size`,`mac_address`, `operating_system`)
       VALUES(:computer_name, :cpu_speed, :ram_size, :mac_address, :operating_system)");
  $stmt->bindValue(":computer_name", $computer_name, PDO::PARAM_STR);
  $stmt->bindValue(":cpu_speed", $cpu_speed, PDO::PARAM_INT);
  $stmt->bindValue(":ram_size", $ram_size, PDO::PARAM_INT);
  $stmt->bindValue(":mac_address", $mac_address, PDO::PARAM_STR);
  $stmt->bindValue(":operating_system", $operating_system, PDO::PARAM_STR);
}
else  // Update existing entry
{
  //computer_name   cpu_speed   ram_size    mac_address     operating_system 
  $stmt = $pdo->prepare("UPDATE system
      SET computer_name=:computer_name,
          cpu_speed=:cpu_speed,
          ram_size=:ram_size,
          operating_system=:operating_sytem,
          mac_address=:mac_address_in
       WHERE mac_address=:mac_address_query");
  echo$stmt->bindValue(":computer_name", $computer_name, PDO::PARAM_STR);
  echo$stmt->bindValue(":cpu_speed", $cpu_speed, PDO::PARAM_INT);
  echo$stmt->bindValue(":ram_size", $ram_size, PDO::PARAM_INT);
  echo$stmt->bindValue(":mac_address_in", $mac_address, PDO::PARAM_STR);
  echo$stmt->bindValue(":operating_system", $operating_system, PDO::PARAM_STR);
  echo$stmt->bindValue(":mac_address_query", $mac_address, PDO::PARAM_STR);
}

// Execute the command
$stmt->execute();

Answer 1

SQLSTATE[HY093]: Invalid parameter number: parameter was not defined

这意味着您有一个未定义的参数。你在这里有错误的接缝operating_system=:operating_sytem,可能应该是operating_system=:operating_system,。这会造成一个缺失的参数，因为它没有在这里设置，因为你拼错了一个词。请尝试检查您prepare语句中的每个单词以及相应的bindValue.