Redis学习笔记(3) List类型值存取
List链表的实现为一个双线链表,支持栈和队列的实现,同时也支持反向查询。是Redis比较常用的数据结构。 List链表支持泛型,结构如List<T>,本例子比较简单,List链表存储的String类型。
List类型存储实现(主要实现队列和栈存取)
新建为RedisDemo 控制台项目,通过Nuget添加servicestack.redis引用。新建RedisClientList的类,具体代码如下:
/// <summary> /// Redis链表操作 /// </summary> public static class RedisClientList { #region Private Fields /// <summary> /// 实例化Redis客户端 /// </summary> private static RedisClient redisClient = new RedisClient("127.0.0.1"); /// <summary> /// 链表1 key名称 /// </summary> public static string ListId = "rcl_testlist"; /// <summary> /// 链表2 key名称 /// </summary> public static string ListId2 = "rcl_testlist2"; #endregion #region Public Methods #region Stack /// <summary> /// 从栈中获取第一项 /// </summary> /// <param name="listId">主键</param> /// <returns>栈头部项</returns> public static string PopItemFromList(string listId) { return redisClient.PopItemFromList(listId); } /// <summary> /// 往栈中插入数据 /// </summary> /// <param name="listId"></param> /// <param name="item"></param> public static void PushItemFromList(string listId, string item) { redisClient.PushItemToList(listId, item); } #endregion #region EnqueueItemOnList /// <summary> /// 往队列中加入值 /// </summary> /// <param name="listId">主键</param> /// <param name="item">项</param> public static void EnqueueItemOnList(string listId, string item) { redisClient.EnqueueItemOnList(listId, item); } /// <summary> /// 往队列中取出值数据 /// </summary> /// <param name="listId">主键</param> /// <returns>第一个进入队列的项</returns> public static string DequeueItemFromList(string listId) { return redisClient.DequeueItemFromList(listId); } #endregion /// <summary> /// 链表中数据容量 /// </summary> /// <param name="listId">主键</param> /// <returns></returns> public static int NameItemCount(string listId) { return redisClient.GetListCount(listId); } #endregion }
RedisClient对List提供的方法本例中用得的有
1、PopItemFromList:某个主键的栈中拉出最后进栈的数据值,先进后出原则。
2、PushItemFromList:往某个主键的栈中压入数据值。
3、DequeueItemFromList: 某个主键的队列中拉出最先进队列的数据值,先进先出原则。
4、EnqueueItemOnList :某个主键的队列中压入数据值。
测试代码如下:
class Program { static void Main(string[] args) { Console.WriteLine("测试栈,是否遵循先进后出原则"); Console.WriteLine("加入名字有\r\n张三"); Console.WriteLine("李四"); Console.WriteLine("王五"); Console.WriteLine("赵六"); //往栈加入数据 RedisClientList.PushItemFromList(RedisClientList.ListId, "张三"); RedisClientList.PushItemFromList(RedisClientList.ListId, "李四"); RedisClientList.PushItemFromList(RedisClientList.ListId, "王五"); RedisClientList.PushItemFromList(RedisClientList.ListId, "赵六"); //往队列加入数据 RedisClientList.EnqueueItemOnList(RedisClientList.ListId2, "张三"); RedisClientList.EnqueueItemOnList(RedisClientList.ListId2, "李四"); RedisClientList.EnqueueItemOnList(RedisClientList.ListId2, "王五"); RedisClientList.EnqueueItemOnList(RedisClientList.ListId2, "赵六"); //栈个数 var stackItemCount = RedisClientList.NameItemCount(RedisClientList.ListId); //队列个数 var enqueueItemCount = RedisClientList.NameItemCount(RedisClientList.ListId2); Console.WriteLine("栈结构输出"); for (var i = 0; i < stackItemCount; i++) { Console.WriteLine("名字:" + RedisClientList.PopItemFromList(RedisClientList.ListId)); } Console.WriteLine(""); Console.WriteLine(""); Console.WriteLine("测试队列,是否遵循先进先出原则"); Console.WriteLine("队列结构输出"); for (var i = 0; i < enqueueItemCount; i++) { Console.WriteLine("名字:" + RedisClientList.DequeueItemFromList(RedisClientList.ListId2)); } Console.ReadLine(); } }
测试结果如下:
测试成功!