feat(region):增加获取全部级别行政区划的功能。

repository/region.go

@@ -0,0 +1,24 @@
+package repository
+
+import (
+	"electricity_bill_calc/cache"
+	"electricity_bill_calc/global"
+	"electricity_bill_calc/model"
+)
+
+type _RegionRepository struct{}
+
+var RegionRepository _RegionRepository
+
+func (_RegionRepository) FetchRegion(code string) (*model.Region, error) {
+	cachedRegion, _ := cache.RetreiveData[model.Region]("region", code)
+	if cachedRegion != nil {
+		return cachedRegion, nil
+	}
+	region := new(model.Region)
+	has, err := global.DBConn.ID(code).NoAutoCondition().Get(region)
+	if has {
+		cache.CacheData(region, "region", code)
+	}
+	return _postProcessSingle(region, has, err)
+}