[feat] 新增 NewOrderBy 方法

support/orm/orderBy.go

@@ -0,0 +1,36 @@
+package orm
+
+import (
+	"git.fsdpf.net/go/contracts"
+	"git.fsdpf.net/go/db"
+)
+
+type OrderByDirection string
+type OrderByType string
+
+const (
+	OrderByDirection_ASC  OrderByDirection = db.ORDER_ASC
+	OrderByDirection_DESC OrderByDirection = db.ORDER_DESC
+)
+
+type OrderBy struct {
+	sql       string           // SQL 或 字段
+	direction OrderByDirection // 排序方向
+}
+
+func NewOrderBy(sql string, params ...OrderByDirection) contracts.OrderBy {
+	direction := OrderByDirection_ASC
+	if len(params) > 0 {
+		direction = params[0]
+	}
+
+	return OrderBy{sql, direction}
+}
+
+func (this OrderBy) ToSql() db.Expression {
+	return db.Raw(this.sql + " " + string(this.direction))
+}
+
+func (this OrderBy) Inject(dbBuilder *db.Builder, m contracts.Model) {
+	dbBuilder.OrderBy(this.ToSql())
+}