'Using Go Defer and Rust Drop to Defer the Call to Rollback' golang rust
My extremely slow journey to learn Rust continues, delayed by other projects. My attention in 2021 has been primarily on Go and PostgreSQL. I'm coming to appreciate and respect the database overall a lot more and wrote up some of my thoughts inOne thing that has me very interested in Rust is the tools it gives me to write code that works in exactly the way I expect it to.
func someWork error { tx, err :=db.Begin err :=foo if err !=nil { tx.Rollback return err } err=bar if err !=nil { tx.Rollback return err } return tx.Commit } func someWork error { tx, err :=db.Begin defer tx.Rollback err :=foo if err !=nil { return err } err=bar if err !=nil { return err } return tx.Commit }
func deferInLoop { for i :=0; i Drop for Transaction { fn drop { if let Some=self.transaction.take { let _=self.connection.block_on); } } } This works exactly as we'd hope -- 200 iterations and no issues. This is because each time the loop iteration ends, the transaction struct gets dropped and rollback is called, all before the next iteration begins.A transaction should end with a call to commit or rollback. If neither are called before the transaction goes out-of-scope, rollback is called. In other words, rollback is called on drop if the transaction is still in-progress.
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