genmai.go
func (c *Condition) Or(cond interface{}, args ...interface{}) *Condition {
	return c.appendQueryByCondOrExpr("Or", 100, Or, cond, args...)
}
func (c *Condition) Or(cond interface{}, args ...interface{}) *Condition {
	return c.appendQueryByCondOrExpr("Or", 100, Or, cond, args...)
}
// Or adds "OR" operator to the Condition and returns it for method chain.