为什么num_rows为0？

Question

这不是其他num_rows == 0帖子的副本，因为在此上下文中不需要store_result。请参阅：us3.php.net/manual/en/mysqli-stmt.get-result.php。只要在查询语句之后立即使用get_result，就不需要store_result。上面文档中的示例代码不使用store_result。

由于某种原因，此查询返回0行时应该为给定地址返回33行，该地址重复33次。我必须在某处找不到语法错误。有谁看到我在这里失踪了什么？

function createIfNew()
{
    $this->logger->log(print_r($this,true));
    $s = $this->db->prepare('SELECT * FROM mcdb2.addresses
                            WHERE
                            addresses_street1 = ?
                            AND addresses_street2 = ?
                            AND addresses_city = ?
                            AND addresses_state = ?
                            AND addresses_zip = ?');
    $s->bind_param('ssssi',$this->addresses_street1,$this->addresses_street2,$this->addresses_city,$this->addresses_state,$this->addresses_zip);
             //Print out the sql because we can't dump a prepared statement.
    $sql = sprintf('SELECT * FROM mcdb2.addresses
                            WHERE
                            addresses_street1 = "%s"
                            AND addresses_street2 = "%s"
                            AND addresses_city = "%s"
                            AND addresses_state = "%s"
                            AND addresses_zip = "%s"',$this->addresses_street1,$this->addresses_street2,$this->addresses_city,$this->addresses_state,$this->addresses_zip);
    $this->logger->log($sql);
    if($s->execute())
    {
        $this->logger->log("Query successful");
        $result = $s->get_result();
        $this->logger->log(print_r($result,true));
        if($result->num_rows == 0)
        {
            $this->logger->log("This address does not exist. Inserting it now.");
            return $this->insert_me();
        } else {
            $this->logger->log("This address already exists in the database. Loading it instead.");
            $row = $result->fetch_assoc();
            $this->addresses_id = $row['addresses_id'];
            $this->load_me();
            return $this->addresses_id;
        }
    }
}