优化整体

cache/cache_db.go

@@ -30,14 +30,14 @@ type CacheDb struct {
 	isInit bool
 }
 
-func (this *CacheDb) GetError() *Error {
+func (that *CacheDb) GetError() *Error {
 
-	return this.Error
+	return that.Error
 
 }
 
-func (this *CacheDb) SetError(err *Error) {
-	this.Error = err
+func (that *CacheDb) SetError(err *Error) {
+	that.Error = err
 }
 
 func (that *CacheDb) initDbTable() {