ioredis通过模式删除所有的键

我使用快递（nodejs）ioredis我知道有一种方法来删除键模式是这样的：

redis-cli KEYS "sample_pattern:*" | xargs redis-cli DEL 

但是，有没有办法做到这一点，而不是使用ioredis？

Answer 1

按模式删除键最直接的方法是使用keys命令获取与模式匹配的键，然后逐个删除它们，这与您提供的命令行示例类似。 这是一个使用ioredis实现的例子：

 var Redis = require('ioredis'); var redis = new Redis(); redis.keys('sample_pattern:*').then(function (keys) { // Use pipeline instead of sending // one command each time to improve the // performance. var pipeline = redis.pipeline(); keys.forEach(function (key) { pipeline.del(key); }); return pipeline.exec(); }); 

但是，当你的数据库有一大堆密钥（比如说一百万）时， keys会阻塞数据库几秒钟。 在这种情况下， scan更有用。 ioredis具有scanStreamfunction，可以帮助您轻松地遍历数据库：

 var Redis = require('ioredis'); var redis = new Redis(); // Create a readable stream (object mode) var stream = redis.scanStream({ match: 'sample_pattern:*' }); stream.on('data', function (keys) { // `keys` is an array of strings representing key names if (keys.length) { var pipeline = redis.pipeline(); keys.forEach(function (key) { pipeline.del(key); }); pipeline.exec(); } }); stream.on('end', function () { console.log('done'); }); 

不要忘了查看scan命令的官方文档以获取更多信息： http ： //redis.io/commands/scan 。

Answer 2

我不太了解ioredis。 但我认为键*和for循环可以处理它。

顺便说一句，我build议你应该使用扫描和del而不是〜

Answer 3

尝试以下命令，您可以为每个前缀创build多个客户端，支持设置get和clear：

 // myredis.js const Redis = require('ioredis'); const ConnectRedis = require('connect-redis'); const config = {}; // your ioredis config const clients = {}; /** * @private create redis client * @param {string} name client name * @param {boolean} isSession is this the application session client or not * @return {Redis|*} */ const createClient = (name, isSession = false) => { let client; client = new Redis({...config, "keyPrefix":`${name}:`)}); client.on('error', msg => console.log("Redis Client[" + name + "]: " + msg)); client.on('connect', () => console.log("Redis Client[" + name + "]: Connected")); if (isSession) { const RedisStore = ConnectRedis(isSession); client = new RedisStore({client}); } return client; }; /** * Create or get redis client * @param {string} name client name * @return {Redis|*} */ const getClient = name => { let client = clients[name]; if (!client || !client.connected) { client = clients[name] = createClient(name); } return client; }; /** * get keys only related to this client prefix * @param name */ const getClientKeys = name => getClient(name).keys(`${name}:*`).then(keys => keys.map(key => key.substr(name.length + 1))); /** * clear client * @param name */ const clearClient = name => getClientKeys(name).then(keys => { const client = getClient(name); client && keys.forEach(key => client.del(key)) }); module.exports = {getClient, clearClient, getClientKeys}; 

如何使用：

 const {getClient, clearClient} = require("./myredis"); // this will get a client with prefix "marvel:" and if it is not exists it will be created const client = getClient("marvel"); // set value client.set("fav", "ironman"); // get the value client.get("fav", (error, value) => console.log(value)); // clear client clearClient("marvel");