How can I get image data string from mysql db that has blob images? Thanks.
Assuming that you're using the default ORM (Propel) that comes with Symfony, $your_object->getImage()* should return whatever blob value you stored in the database.
You might already know this and it's not an option, but have you considered storing the images in a directory and using the database to store the path to the images ?
*Assuming 'image' is the field name in the database/schema.yml
There is always flamewar about storing images in a database vs. filesystem.
Storing them in a database is more secure (if you need to secure access to them) but usually you need wrapper to read and display them in tag (if you do it).
There's a lot of pros and cons... Depends on your needs what is better.
and yes sjobe's $x->getImage() would be enough to get a blob content.