Redis provides some easy ways to check whether or not a field exists in a given hash. Here are five commands that we can use to check for the existence of a field in a given hash.
Continue readingCategory: NoSQL
3 Ways to Update a Field in a Redis Hash
The following commands can be used to update a field in a Redis hash. The command we use will depend on the type of data that’s stored in the field.
Continue readingHow to Return Field Values when using HRANDFIELD in Redis
In Redis, we can use the HRANDFIELD command to return random fields from a given hash. By default, only the field names are returned.
But what if we want to include the field values?
In this case, we can use the WITHVALUES option when calling the command.
Fix: “ERR wrong number of arguments for ‘smove’ command” in Redis
If you’re getting an error that reads “ERR wrong number of arguments for ‘smove’ command” in Redis, it’s because you’re calling the SMOVE command with the wrong number of arguments.
To fix this issue, make sure you’re passing the correct number of arguments. At the time of writing, the correct number of arguments for this command is three.
Continue readingHow to Delete a Field in a Redis Hash
If you’ve got a Redis hash with a field that needs to be deleted, you can use the HDEL command.
Fix “ERR syntax error” when calling SRANDMEMBER in Redis
If you’re getting an error that reads “ERR syntax error” when calling the SRANDMEMBER command in Redis, it could be that you’re passing too many arguments.
To fix this issue, be sure to pass the correct number of arguments. At the time of writing, SRANDMEMBER accepts up to two arguments. Any more than this results in an error.
4 Ways to Insert a Field in a Redis Hash
I decided to compile a list of commands that can insert a new field into a Redis hash. Here are four options for inserting a new field into a Redis hash.
Continue readingRedis HINCRBYFLOAT Command
The Redis HINCRBYFLOAT command increments the field in the hash at the specified key by a floating point number. We specify how much we want the field to increment by when we call the command.
Redis HINCRBY Command
The Redis HINCRBY command increments the number that’s stored at the specified field in the hash at the specified key. We specify how much we want the field to increment by when we call the command.
Redis HVALS Command
The Redis HVALS command returns all values in the hash stored at the specified key.