move dir & delete some useless function

client/orm/structs/clauses/const.go

@@ -0,0 +1,5 @@
+package clauses
+
+const (
+	ExprSep                = "__"
+)

client/orm/structs/clauses/order.go

@@ -0,0 +1,40 @@
+package clauses
+
+type Sort int8
+
+const (
+	ASCENDING  Sort = 1
+	DESCENDING Sort = 2
+)
+
+type Order struct {
+	column string
+	sort   Sort
+}
+
+func (o *Order) GetColumn() string {
+	return o.column
+}
+
+func (o *Order) GetSort() Sort {
+	return o.sort
+}
+
+func ParseOrder(expressions ...string) []*Order {
+	var orders []*Order
+	for _, expression := range expressions {
+		sort := ASCENDING
+		column := expression
+		if expression[0] == '-' {
+			sort = DESCENDING
+			column = expression[1:]
+		}
+
+		orders = append(orders, &Order{
+			column: column,
+			sort:   sort,
+		})
+	}
+
+	return orders
+}