Add row-level locking options#1810
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- This only works inside a transaction and seems to make no effect on MySQL where it will always lock even without the option. - There's also no support for this feature on SQLite.
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Introduction
Follow-up to the previous implementation on the linked PR.
Motivation and Proposed solution
This adds tests and uses a slightly different implementation that is less repetitive and more easily expandable if needed.
Closes #516.
Current PR Issues
Tests aren't very exhaustive.
There's also no check to see if the lock options are being applied to a
selectstatement, but it's possible that Knex already takes care of this. In any case this is an advanced feature, so users that want it should know what they're doing.