'How to achieve Solidity's mapping in Solana?

How to achieve the functionality of Solidity's mapping in Solana? What I need is a map with an arbitrary number of entries (it'll be evergrowing).

So how to calculate the rent exemption and how to actually do this? Is it even possible?

I just need 1 account, so 1 global hashmap in a program.

I would be storing keys as integers and values as strings.

Solution 1:^[1]

in solana it's more common to use PDAs for this purpose, encode the key inside the seed and use the account data for storing the value.

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Solution	Source
Solution 1	Maximilian Schneider