import logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

class Base(object):

    def query(self, sql, placeholders):
        res = None
        cur = self.conn.cursor()
        try:
            cur.execute(sql, placeholders)
            res = cur.fetchall()
        except Exception as e:
            logger.error("{0}".format(e))
            pass
        finally:
            cur.close()
        
        return res

    def update(self, sql, placeholders):
        rows = None
        cur = self.conn.cursor()
        try:
            cur.execute(sql, placeholders)
            self.conn.commit()
            rows = cur.rowcount
        except Exception as e:
            self.conn.rollback()
            raise Exception(e)
        finally:
            cur.close()
        
        return rows
        
    def insert(self, sql, placeholders):
        lastid = None
        cur = self.conn.cursor()
        try:
            cur.execute(sql, placeholders)
            if self.__class__.__name__ == 'Postgres':
                cur.execute('select lastval()')
                lastid = cur.fetchone()[0]
            else:
                lastid = cur.lastrowid
            self.conn.commit()
        except Exception as e:
            self.conn.rollback()
            raise Exception(e)
        finally:
            cur.close()
        
        return lastid
        
    def ddl(self, sql):
        cur = self.conn.cursor()
        try:
            if self.__class__.__name__ == 'Mysql':
                for r in cur.execute(sql, multi=True):
                    pass
            else:
                cur.execute(sql)
            self.conn.commit()
        except Exception as e:
            self.conn.rollback()
            raise Exception(e)
        finally:
            cur.close()
        
    def __del__(self):
        #print("%s: deleted" % self.__class__.__name__)
        try:
            self.conn.close()
            self.conn = None
        except AttributeError:
            pass
        except:
            raise