Redis XADD in Ruby (Detailed Guide w/ Code Examples)
The XADD command in Redis is used with the Streams data type. It appends new entries to a stream. Common use cases include:
Logging systems: where each log entry is added as a new message.
Data streaming: continuously capturing real-time data.
Here's a basic usage of the XADD command using Ruby:
require'redis'redis =Redis.new# Add an entry to the stream 'mystream'redis.xadd('mystream','*','key1','value1','key2','value2')
In this example, we're adding an entry to the stream named 'mystream'. The '*' generates an ID based on the current timestamp. 'key1' and 'key2' represent field names and 'value1' and 'value2' are their respective values.
To add multiple messages at once:
require'redis'redis =Redis.new# Add multiple entries to the stream 'mystream'fields_values =['key1','value1','key2','value2']fields_values2 =['key3','value3','key4','value4']redis.xadd('mystream','*',*fields_values)redis.xadd('mystream','*',*fields_values2)
This will add two separate entries to 'mystream', each with their own unique IDs and key-value pairs.
Keep your streams and entries adequately small for efficient memory usage.
If possible, use auto-generated IDs ('*') instead of manually inputted ones for better performance and uniqueness.
Trying to add an entry to a non-existent stream. Redis will automatically create the stream if it doesn't exist.
Using large-sized data in streams which can lead to memory inefficiency.
Q: Can I use XADD with other data types?
A: No, XADD is specifically designed for use with Redis Streams.
Q: What happens if I try to add an entry to a non-existent stream?
A: Redis will automatically create the stream.
Q: How many fields can I add to a stream entry?
A: There's no hard limit, but remember that each additional field consumes more memory.