如何将数组存储在redis服务器的Key值对的值中？

I am using redis server to store key-value(username-socketID) pairs for a chat app in socket.io.

我正在使用redis服务器为socket.io中的聊天应用程序存储键值（username-socketID）对。

The problem i have faced is that the same username can login from different devices so will have different socketIDs. SO i have to associate an array of socketIDs against one username. I was trying to associate an array to the key but itseems to be taking only the first element of the array as a string. Below is my code

我遇到的问题是相同的用户名可以从不同的设备登录，因此将具有不同的套接字ID。所以我必须将一个socketID数组与一个用户名相关联。我试图将数组与键相关联，但它似乎只是将数组的第一个元素作为字符串。以下是我的代码

Setting the array to the key:

将数组设置为键：

var socketIDs = [];
            socketIDs.push(socket.id);
            client.set(username, socketIDs, function (err) {
                console.log("IN USERNAME EVENT" + username + ":" + socketIDs);
            });

Getting the array from the key:

从密钥中获取数组：

client.get(username, function (err, socketIDs) {
                var i = socketIDs.indexOf(socket.id);
                if (i != -1)
                {
                    socketIDs.splice(i, 1);
                }
                client.set(username, socketIDs, function (err) {
                    console.log(username + " DISCONNECTED");
                    socket.disconnect();
                });
            });

When am trying to fetch the value associated with the username, i get just the socketID as a string and not the array format that i had originally added as.

当我尝试获取与用户名关联的值时，我只将socketID作为字符串而不是我最初添加的数组格式。

Any fix for this? or what is the best way to approach my requirement of storing multiple values for a single key?

对此有任何修复？或者什么是满足我为单个密钥存储多个值的要求的最佳方法？

1 个解决方案

#1

I would recommend using a list or a set. I would use a list unless you need duplication checks (if so then use a set). All the following examples are list based but you can find the equivalents for set here.

我建议使用列表或集合。我会使用一个列表，除非你需要重复检查（如果是这样，那么使用一组）。以下所有示例均基于列表，但您可以在此处找到设置的等效项。

Adding a new socket ID

添加新的套接字ID

client.lpush(username, socket.id, function(err) {
    console.log('Prepended new socket ID to list');
});

Getting all socket IDs for a user

获取用户的所有套接字ID

client.lrange(username, 0, -1, function(err, socketIds) {
});

Removing a given socket ID

删除给定的套接字ID

client.lrem(username, socketId, 0, function(err) {
});

(I've assumed you're using the node_redis lib).

（我假设你正在使用node_redis lib）。

#1