fix: fixed cache unll value judgment of SQLLite BaseGet

src/EasyCaching.SQLite/DefaultSQLiteCachingProvider.cs

@@ -85,15 +85,15 @@ public DefaultSQLiteCachingProvider(
         /// </summary>
         /// <param name="dbProvider"></param>
         private void InitDb(ISQLiteDatabaseProvider dbProvider)
-        {            
+        {
             var conn = dbProvider.GetConnection();
 
             if (conn.State == System.Data.ConnectionState.Closed)
             {
                 conn.Open();
             }
 
-            conn.Execute(ConstSQL.CREATESQL);            
+            conn.Execute(ConstSQL.CREATESQL);
         }
 
         /// <summary>
@@ -159,16 +159,16 @@ public override CacheValue<T> BaseGet<T>(string cacheKey)
                 name = _name
             }).FirstOrDefault();
 
-            if (!string.IsNullOrWhiteSpace(dbResult) || _options.CacheNulls)
+            if (!string.IsNullOrWhiteSpace(dbResult))
             {
                 CacheStats.OnHit();
 
                 if (_options.EnableLogging)
                     _logger?.LogInformation($"Cache Hit : cachekey = {cacheKey}");
-
-                return string.IsNullOrWhiteSpace(dbResult) 
+                var cacheValue = Newtonsoft.Json.JsonConvert.DeserializeObject<T>(dbResult);
+                return cacheValue == null
                     ? CacheValue<T>.Null
-                    : new CacheValue<T>(Newtonsoft.Json.JsonConvert.DeserializeObject<T>(dbResult), true);
+                    : new CacheValue<T>(cacheValue, true);
             }
             else
             {
@@ -221,7 +221,7 @@ public override void BaseSet<T>(string cacheKey, T cacheValue, TimeSpan expirati
                 expiration = expiration.Ticks / 10000000
             });
 
-        }          
+        }
 
         /// <summary>
         /// Removes cached item by cachekey's prefix.
@@ -247,10 +247,10 @@ public override void BaseRemoveByPattern(string pattern)
 
             if (_options.EnableLogging)
                 _logger?.LogInformation($"RemoveByPattern : pattern = {pattern}");
-            
+
             _cache.Execute(ConstSQL.REMOVEBYLIKESQL, new { cachekey = pattern.Replace('*', '%'), name = _name });
         }
-        
+
         /// <summary>
         /// Sets all.
         /// </summary>
@@ -276,7 +276,7 @@ public override void BaseSetAll<T>(IDictionary<string, T> values, TimeSpan expir
             }
 
             tran.Commit();
-        }   
+        }
 
         /// <summary>
         /// Gets all.
@@ -339,7 +339,7 @@ public override IDictionary<string, CacheValue<T>> BaseGetByPrefix<T>(string pre
 
             return GetDict<T>(list);
         }
-    
+
         /// <summary>
         /// Removes all.
         /// </summary>