Description:
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I recognized, that the return value stay TRUE, even if the sql statement could not be executed correctly.

Test script:
---------------
Example:
$sth = $this->db->prepare("REPLACE INTO test
				                                    SET bar = :foo);
$error = $sth->execute(array('foo' => 'bar'));

/*
$error will be TRUE, because sql is correct and sent.

However, if the mysql user has not the rights (INSERT,DELETE) to do this, the statement will be not executed at all without error message.

So, don't rely on the returning value until this is fixed!

Expected result:
----------------
$error should be FALSE

Actual result:
--------------
$error is TRUE