func (c DBConfig) ConnStr() string {
	comps := []string{}
	for k, v := range c.Conn {
		comps = append(comps, k+"="+v)
	}
	return strings.Join(comps, " ")
}
func (c DBConfig) ConnStr() string {
	comps := []string{}
	for k, v := range c.Conn {
		comps = append(comps, k+"="+v)
	}
	return strings.Join(comps, " ")
}
// ConnStr composes a data connection string.