redis数据库的简单用法

千家信息网最后更新 2024年09月22日redis数据库的简单用法

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using Newtonsoft.Json;
using StackExchange.Redis;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp
{
///

/// Redis 操作类
///

public class RedisHelper
{
///

/// 连接字符串
///

private static readonly string ConnectionString = ConfigurationManager.AppSettings["RedisConnectionString"];

///

/// 锁
///

private readonly object _lock = new object();
///

/// 连接对象
///

private volatile IConnectionMultiplexer _connection;
///

/// 数据库
///

private IDatabase _db;

public RedisHelper()
{
_connection = ConnectionMultiplexer.Connect(ConnectionString);
_db = GetDatabase();
}

///

/// 获取连接
///

///
protected IConnectionMultiplexer GetConnection()
{
if (_connection != null && _connection.IsConnected)
{
return _connection;
}
lock (_lock)
{
if (_connection != null && _connection.IsConnected)
{
return _connection;
}

if (_connection != null)
{
_connection.Dispose();
}
_connection = ConnectionMultiplexer.Connect(ConnectionString);
}

return _connection;
}

///

/// 获取数据库
///

///
///
public IDatabase GetDatabase(int? db = null)
{
//return _connection.GetDatabase(db ?? -1);
return GetConnection().GetDatabase(db ?? -1);
}

///

/// 设置
///

/// 键
/// 值
/// 时间
public virtual void Set(string key, object data, int cacheTime)
{
if (data == null)
{
return;
}
var entryBytes = Serialize(data);
var expiresIn = TimeSpan.FromMinutes(cacheTime);

_db.StringSet(key, entryBytes, expiresIn);
}

///

/// 根据键获取值
///

///
///
///
public virtual T Get(string key)
{
var rValue = _db.StringGet(key);
if (!rValue.HasValue)
{
return default(T);
}

var result = Deserialize(rValue);

return result;
}

///

/// 反序列化
///

///
///
///
protected virtual T Deserialize(byte[] serializedObject)
{
if (serializedObject == null)
{
return default(T);
}
var json = Encoding.UTF8.GetString(serializedObject);
return JsonConvert.DeserializeObject(json);
}

///

/// 判断是否已经设置
///

///
///
public virtual bool IsSet(string key)
{
return _db.KeyExists(key);
}

///

/// 序列化
///

///
/// byte[]
private byte[] Serialize(object data)
{
var json = JsonConvert.SerializeObject(data);
return Encoding.UTF8.GetBytes(json);
}
}
}

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