Problems connecting to db using Zend db as standalone - php

Question

I am migrating from ZF1 Zend_db to ZF2. I have problems connecting to the db and making a simple query. Appreciate if someone can guide me along. Below is my code.
This is how i connect to db
use Zend\Db\Adapter\Adapter;
$dbo = new Zend\Db\Adapter\Adapter(array(
'driver' => 'pdo_mysql',
'database' => DB_PREFIX.DB_NAME,
'username' => DB_USER,
'password' => DB_PW
));
Zend_Registry::set('db', $dbo);
This isan example how i use it.
$this->dbo = Zend_Registry::get('db');
function createData($message,$tags,$userid,$imgsrc){
$data= array(
'message' => $message,
'tags' => $tags,
'imgsrc' => $imgsrc,
'createdtimestamp'=>new Zend_Db_Expr('NOW()'),
'userid' => $userid);
$this->dbo->insert('mydata', $data);
return $this->dbo->lastInsertId();
}
I have an error. That is $dbo does not have select(),insert() methods etc. I could did it in ZF1 zend db.
Example of error message i received:
Fatal error: Call to undefined method
Zend\Db\Adapter\Adapter::select() in

Answer 1

You seem to think that ZF2 and ZF1 are (and should be) class-compatible. The problem is, they're not - at least in regards to Zend\Db\Adapter. That one in ZF2 is much more concise: while it has query method, its main responsibility is abstracting the DB connection itself.
I suppose what you're looking for is located in Zend\Db\Sql area. Assuming you have your DB connection in $dbo, you can create an Sql object based on it:
use Zend\Db\Sql as Sql;
$sql = new Sql\Sql($dbo);
... then create another object (of Zend\Db\Sql\Insert class):
$insert = $sql->insert('mydata');
$insert->values([
'message' => $message,
'tags' => $tags,
'imgsrc' => $imgsrc,
'createdtimestamp'=>new Sql\Expression('NOW()'),
'userid' => $userid
]);
... then use this object in query:
$insertString = $sql->getSqlStringForSqlObject($insert);
$results = $dbo->query($insertString, Adapter::QUERY_MODE_EXECUTE);