Phalcon PDO transaction is not working correct - mysql

Question

It nearly took me a whole day to resolve the problems about transactions, but I failed.
My requirement is INSERT a new record both in table topic and table topic_data in one transaction.
I have my code like this :
// database connection
$di->set( 'db', function() use( $conf ) {
return new \Phalcon\Db\Adapter\Pdo\Mysql as DbAdapter( [
'host' => $conf->db->host,
'username' => $conf->db->username,
'password' => $conf->db->password,
'dbname' => $conf->db->dbname,
'options' => [
\PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION,
\PDO::ATTR_PERSISTENT => true,
\PDO::ATTR_AUTOCOMMIT => false
]
] );
} );
// transaction code
public function create( $params ) {
$this->db->begin();
$id = \Idalloc::next();
$topic = new Topic();
$topic->id = $id;
$topic->ctime = $_SERVER[ 'REQUEST_TIME' ];
$tags = $params[ 'tags' ];
$params[ 'tags' ] = implode( ',', $tags );
$topic->assign( $params );
if( $topic->save() === false ) {
$this->db->rollback();
return false;
}
for( $i = 0, $l = count( $tags ); $i < $l; ++$i ) {
$topicTag = new TopicTag();
$topicTag->tag_id = $tags[ $i ];
$topicTag->topic_id = $id;
$topicTag->type = $params[ 'type' ];
if( $topicTag->save() === false ) {
$this->db->rollback();
return false;
}
}
var_dump( $this->db->isUnderTransaction() );
$this->db->commit();
return $id;
}
The fails with :
If I don't set \PDO::ATTR_PERSISTENT => true, method "create" with return $id and var_dump( $this->db->isUnderTransaction() ) is TRUE but NO DATA been inserted into both table topic and table topic_tag
If I set \PDO::ATTR_PERSISTENT => true, I will get Exception with :
[Tue, 21 Jun 16 02:16:21 +0800][ERROR] PDOException: There is no active transaction
And still failed to insert data into table topic, but new record appearing in table topic_tag.
If I only keep one of the two parts, it will be working well.
How can I resolve this problem and is there a simple way to create Manual Transactions ?

Answer 1

I found out the solution for this question. The 'db' set in DI must be shared. So there need another parameter "TRUE" :
// database connection
$di->set( 'db', function() use( $conf ) {
return new \Phalcon\Db\Adapter\Pdo\Mysql as DbAdapter( [
'host' => $conf->db->host,
'username' => $conf->db->username,
'password' => $conf->db->password,
'dbname' => $conf->db->dbname,
'options' => [
\PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION,
\PDO::ATTR_PERSISTENT => true,
\PDO::ATTR_AUTOCOMMIT => false
]
] );
}, true );