title: Pdo Mysql : Warning: Packets out of order
body: <p>I get the error "Uncaught Exception
    Warning: Packets out of order. Expected 1 received 166. Packet size=52"
  when running two PDO queries one after the other.</p>
  
  <pre><code>$dbh = new \PDO('mysql:host=' . $dbHost . ';dbname=' . $dbName, $dbUser, $dbPass, array(
              \PDO::MYSQL_ATTR_LOCAL_INFILE =&gt; true
          ));
  
  $sql = &lt;&lt;&lt;eof
              LOAD DATA LOCAL INFILE '$csv'
               INTO TABLE $table
               FIELDS TERMINATED BY ';' OPTIONALLY ENCLOSED BY '"'
               LINES TERMINATED BY '\n'
               IGNORE 1 LINES
              ($columns);
              ALTER TABLE $table ADD COLUMN disabled INT DEFAULT 0
  eof;
  $dbh-&gt;query($sql);
  $sql = 'SELECT COUNT(id) FROM '.$table.' WHERE myfield IS NULL';
  $dbh-&gt;query($sql);
  </code></pre>
  
  <p>What I'm trying to do : after import of large CSV file (about 30 MB and 40k lines) into database, I want to count how many rows are empty in a field, to fill them in a later query.</p>
  
  <p>I noticed I can run the first query if I comment out the second one, and then I can run the second query if I comment out the first one. If I try to run them one after the other, it fails. I tried raising memory packet to 20M from 8M, and also to set $dbh->setAttribute(\PDO::ATTR_EMULATE_PREPARES, true);  with no success. Similar code worked with a smaller dataset earlier. Any pointers very welcome!</p>