An in-memory Key-Value database made with Go

An in-memory Key-Value database made with Go, for no particular reason other than to learn basic things about the language (really I just thought it would be fun, and it actually was).

Usage

go run main.go

Commands

The commands below are also recognized even when they are not in uppercase.

• HELP: Display all commands
• ALL: Display all entries in the database
• GET <key>: Get the value of a key
• CREATE <key> <value>: Create a new entry in the database
• DELETE <key>: Delete an entry from the database
• LEVEL: Display the current level structure
• DOWN: Move down to the next level
• APPLY: Apply changes to the parent level
• DISCARD: Discard changes and move up to the parent level
• EXIT: Exit the program

What are levels?

A level is the basic data type structure in this database. It essentially defines a map (which is actually where the data is stored), a reference to the parent level, and a depth.

Each level can have its own changes made to the database, and they are only applied/discarded with the commands APPLY and DISCARD. Both commands are very similar: they terminate the current level and move up to the parent level. The difference is that APPLY applies the changes to the parent level, while DISCARD discards it.

You can always check where you are with the LEVEL command.