func (em *Engine) Connect(params *proto.DbConnectParams) (conn *DBConnection, err error) {
var c proto.DbConnection
c, err = em.dbEngine.Connect(params)
log.Info("Come to a new client %v, id is %d", params.UserName, c.Id())
if conn != nil && err != nil {
conn.Close()
return nil, err
}
conn = &DBConnection{connectionParams: params, DbConnection: c}
return conn, nil
}
