优化 SQLiteHelper 只有当有数据被删除时，才会数据库压缩

Project.SQLiteHelper/SQLiteHelper/SQLiteDbContext.cs

@@ -257,12 +257,14 @@ namespace SQLite
             sqls.RemoveAll(sql => sql == null);
             if (sqls.Count == 0)
                 return;
-
-            if (sqliteHelper.QueryTran(sqls)) {
+            int cnt = 0;
+            foreach (var sql in sqls) {
+                cnt += sqliteHelper.ExecuteNonQuery(sql);
+            }
+            if (cnt > 0) {
                 //数据库压缩
                 sqliteHelper.ExecuteNonQuery("VACUUM");
             }
-            
         }
         
         /// <summary>

Project.SQLiteHelper/SQLiteHelper/SQLiteHelper.cs

@@ -446,18 +446,21 @@ namespace SQLite
         /// <param name="parameters">执行增删改语句所需要的参数，参数必须以它们在SQL语句中的顺序为准。</param> 
         /// <returns></returns> 
         /// <exception cref="Exception"></exception>
-        public void ExecuteNonQuery(string sql)
+        public int ExecuteNonQuery(string sql)
         {
+            int ret = 0;
             using (SQLiteConnection connection = new SQLiteConnection(ConnectionString))
             {
                 using (SQLiteCommand command = new SQLiteCommand(connection))
                 {
                     connection.Open();
                     command.CommandText = sql;
-                    command.ExecuteNonQuery();
+                    ret = command.ExecuteNonQuery();
                     connection.Close();
                 }
             }
+            return ret;
+
         }