import psycopg2
import psycopg2.extras


class DbManager(object):

    def __init__(self,db_uri):
        self.db_uri=db_uri
        self.conn=psycopg2.connect(db_uri,cursor_factory=psycopg2.extras.DictCursor)

    def load_user(self,username):
        with self.conn.cursor() as c:
            c.execute("select * from users where username=%s",(username,))
            user=c.fetchOne()
            return user