Redis 作为内存中数据结构存储快速入门指南

了解如何使用基本的 Redis 数据类型

本快速入门指南向您展示如何：

  1. 开始使用 Redis
  2. 在 Redis 的 key 下存储数据
  3. 使用 Redis 中的键检索数据
  4. 扫描键空间以查找与特定模式匹配的键

本文中的示例是指简单的自行车清单。

设置

开始使用 Redis 的最简单方法是使用 Redis Cloud：

  1. 创建一个免费帐户。

  2. 按照说明创建免费数据库。

您也可以按照安装指南在本地计算机上安装 Redis。

连接

第一步是连接到 Redis。您可以在此文档站点的 Tools 部分中找到有关连接选项的更多详细信息。以下示例显示如何连接到在 localhost （-h 127.0.0.1） 并监听默认端口 （-p 6379):


Tip:
You can copy and paste the connection details from the Redis Cloud database configuration page. Here is an example connection string of a Cloud database that is hosted in the AWS region us-east-1 and listens on port 16379: redis-16379.c283.us-east-1-4.ec2.cloud.redislabs.com:16379. The connection string has the format host:port. You must also copy and paste the username and password of your Cloud database and then either pass the credentials to your client or use the AUTH command after the connection is established.

Store and retrieve data

Redis stands for Remote Dictionary Server. You can use the same data types as in your local programming environment but on the server side within Redis.

Similar to byte arrays, Redis strings store sequences of bytes, including text, serialized objects, counter values, and binary arrays. The following example shows you how to set and get a string value:

Hashes are the equivalent of dictionaries (dicts or hash maps). Among other things, you can use hashes to represent plain objects and to store groupings of counters. The following example explains how to set and access field values of an object:

You can get a complete overview of available data types in this documentation site's data types section. Each data type has commands allowing you to manipulate or retrieve data. The commands reference provides a sophisticated explanation.

Scan the keyspace

Each item within Redis has a unique key. All items live within the Redis keyspace. You can scan the Redis keyspace via the SCAN command. Here is an example that scans for the first 100 keys that have the prefix bike::

SCAN 0 MATCH "bike:*" COUNT 100

SCAN returns a cursor position, allowing you to scan iteratively for the next batch of keys until you reach the cursor value 0.

Next steps

You can address more use cases with Redis by learning about Redis Stack. Here are two additional quick start guides:

Continue learning with Redis University

See the Get Started with Redis learning path for courses.

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