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This is why, when we were developing our own SQL client library for Rust, we deliberately made it much easier to just do the right thing and use prepared statements:
Glad you're interested in Rust! First, in case you somehow haven't come across a recommendation already, a great way to learn once you're ready is the free Rust book. And about your question, yes, it would prevent my_str from being "destroyed", though you do have to make one small change - you have to borrow my_str explicitly, like this: