enhance(repo):改进缓存方法。

repository/abstract.go

@@ -1,5 +1,10 @@
 package repository
 
+import (
+	"electricity_bill_calc/cache"
+	"time"
+)
+
 func _postProcessSingle[T interface{}](instance *T, has bool, err error) (*T, error) {
 	if err != nil {
 		return nil, err
@@ -21,3 +26,21 @@ func _postProcessList[T interface{}](instance []*T, has bool, err error) ([]*T,
 		return nil, nil
 	}
 }
+
+func cacheData[T interface{}](instance T, category string, key ...string) error {
+	var keys = make([]string, 0)
+	keys = append(keys, category)
+	keys = append(keys, key...)
+	cacheKey := cache.CacheKey("cache", keys...)
+	if exists, _ := cache.Exists(cacheKey); exists {
+		cache.Delete(cacheKey)
+	}
+	return cache.Cache(cacheKey, &instance, 5*time.Minute)
+}
+
+func retreiveData[T interface{}](category string, key ...string) (*T, error) {
+	var keys = make([]string, 0)
+	keys = append(keys, category)
+	keys = append(keys, key...)
+	return cache.Retreive[T](cache.CacheKey("cache", keys...))
+}