使用ServiceStack.Redis C＃.Net在Redis Server中从第m行到第n行搜索数据

Question

我的Redis服务器在数据键[urn:Customer]中有1000个Customer行。 我需要从我的自动完成过程的记录集中获取分页结果。

我的代码：

var custDetails = from C in nwDB.Customers
                  select new { 
                      C.CustomerID, C.CompanyName, 
                      C.ContactName, C.City, 
                      C.Country, C.PostalCode, 
                      C.Phone, C.Fax 
                  };

using (var redis = new RedisClient())
{
    redis.FlushDb();
    redis.FlushAll();

    var RedisUsers = redis.As<CustomerR>();
    RedisUsers.SetSequence(0);

    foreach (var eachCustomer in custDetails)
    {
        RedisUsers.Store(new CustomerR
        {
            RedisCustID = RedisUsers.GetNextSequence(),
            CustomerID = eachCustomer.CustomerID,
            CompanyName = eachCustomer.CompanyName,
            ContactName = eachCustomer.ContactName,
            City = eachCustomer.City,
            Country = eachCustomer.PostalCode,
            Phone = eachCustomer.Phone,
            Fax = eachCustomer.Fax
        });
    }

    var allThepeople = RedisUsers.GetAll();
    gvCustomers.DataSource = allThepeople;
    gvCustomers.DataBind();
}

我需要使用GetAll()值仅显示前50行，而不是RedisUsers.GetNextSequence()。

Answer 1

每个客户使用一个密钥

最好将每个客户存储为自己的密钥。 即。 urn:Customer:123代表CustomerID = 123。

这使我们能够通过选择该密钥来通过其ID访问客户。但它也允许我们SCAN匹配Customer键模式的键。即urn:Customer:<id>。

您还可以避免创建任意RedisCustID，只需使用CustomerID，就可以避免很多混乱。

存储客户：

var custDetails = from c in nwDB.Customers select new { 
    c.CustomerID, 
    c.CompanyName, 
    c.ContactName, 
    c.City, 
    c.Country, 
    c.PostalCode, 
    c.Phone, 
    c.Fax
};

using (var redis = new RedisClient())
{
    var customers = redis.As<CustomerR>();

    foreach(var customer in custDetails)
    {
        // The key for this customer
        var customerKey = string.Format("Customer:{0}", customer.CustomerID);

        // Store the customer
        // Use ConvertTo<T> to auto map the properties
        customers.SetEntry(customerKey, customer.ConvertTo<CustomerR>());
    }
}

按Id：

检索客户

using (var redis = new RedisClient())
{
    var customers = redisClient.As<CustomerR>();
    var customerKey = string.Format("Customer:{0}", 123);
    var customer = customers.GetValue(customerKey);
}

检索所有客户：

using (var redis = new RedisClient())
{
    var customerKeys = redis.ScanAllKeys("Customer:*").ToList();
    var allCustomers = redis.GetValues<CustomerR>(customerKeys);
}

检索前50位客户：

ScanAllKeys方法允许您分页结果，这最终是您要做的。

using (var redis = new RedisClient())
{
    var customerKeys = redis.ScanAllKeys("Customer:*", 50).ToList();
    var top50Customers = redis.GetValues<CustomerR>(customerKeys);
}

要检索特定范围之间的客户：

即。获得第10页的第3页

int page = 3;
int pageSize = 10;

int startAt = pageSize * page;
int endAt = startAt + pageSize;

using (var redis = new RedisClient())
{
    var pagedCustomerKeys = redis.ScanAllKeys("Customer:*", endAt).ToList().Skip(startAt).Take(pageSize);
    var pagedCustomers = redis.GetValues<CustomerR>(pagedCustomerKeys);
}

如果您想了解如何更新客户或删除客户see this answer，请提供更多示例。

我希望有所帮助。