How to use R2DBC to convert database sync call to async call

[Vanshika Bajaj]

Suppose there are multiple threads , so the main thread is giving the information to the other thread and there in the main thread gets block, and all the threads are called sequentially, what can be done such that the main thread doesn't get block and the threads are running parallely, basically how can we convert the database sync call to database async call using the jdbc or r2dbc library, please answer