与PHP PDO相关：更新SQL语句不更新数据库内容

Question

I am trying to implement an update statement using a prepared statement in a PHP script, but it appears that it is not updating the record in the database and I am not sure why and so would appreciate if you can share some insights.

Code

$query = "UPDATE DatTable SET DF_PARTY_ID = :party_id,
          DF_PARTY_CODE = :party_code,
          DF_CONNECTION_ID = :connection_id WHERE DF_PARTY_ID = ':party_id'";
$stmt = $this->connection->prepare($query);
$stmt->bindValue(':party_id', $data[0], PDO::PARAM_INT);
$stmt->bindValue(':party_code', $data[1], PDO::PARAM_INT);
$stmt->bindValue(':connection_id', $data[2], PDO::PARAM_INT);
$stmt->execute();

Inspiring solution leading to this approach. How can I fix this problem?

Answer 1

Make sure that the party_id you are trying to update exists in the database.

Also, if your table is InnoDB , make sure that you have autocommit on or issue an explicit commit after the update is made.

Answer 2

Instead of guessing, basic error handling must be implemented:

$arr = $stmt->errorInfo();
print_r($arr);

Answer 3

Might not help, but why are you only binding 3 variables, when there are 4? I can't say that I have experience doing this in PHP, but in Perl and Oracle it would throw an error. I'd try binding the 2 SETs and the 1 WHERE, and removing the first assignment, and see if that works.

Answer 4

I'm not sure if you want to do what you're trying to do.

Your UPDATE statement basically says update the key and two values based on the NEW value, since party_id is in the SET and WHERE clauses.

You may want to change your prepared statement to this:

UPDATE DatTable SET DF_PARTY_ID = :party_id, DF_PARTY_CODE = :party_code, DF_CONNECTION_ID = :connection_id WHERE DF_PARTY_ID = ':old_party_id'

bind your NEW party_id value to :party_id and the CURRENT one to :old_party_id