Re: Re: Resurrected thread: Speed improvement - Group batch
Insert - Rewrite the INSERT at the driver level (using a parameter) - Mailing list pgsql-jdbc
From
Dave Cramer
Subject
Re: Re: Resurrected thread: Speed improvement - Group batch
Insert - Rewrite the INSERT at the driver level (using a parameter)
Jeremy Whiting schrieb am 25.03.2015 um 20:34: > "If your use case is just "I want to do bulk inserts as fast as possible" then perhaps the newly merged COPY suport is a better way to go."
I wonder if it is possible to silently "rewrite" a batched statement to use the CopyManager.
copy doesn't invoke rules... not that I think rules are a great thing. I imagine some folks might have an issue.
Very(!) roughly speaking: when the first call to addBatch() is made, initialize the CopyManager and provide a a Reader implementation that acts as a bridge between the PreparedStatement.setXXX()/addBatch() statements and the CopyManager. Something like a producer/consumer pattern. The setXXX() calls would prepare a single "line" and the addBatch() would then "send" this to the CopyManager which is blocked on the Read.readLine() call.
But I have no clue if this would even be possible (blocking Reader.readLine() but sill allowing calls to addBatch() in the same Thread seems a major roadblock to me) or - if possible - how much work it would be.
It would definitely require parsing the insert statement passed to the prepareStatement() clause, but as the syntax of a plain insert statement isn't that complicated, I think that should be doable - especially because we wouldn't need to worry about literals as only placeholders will be (must be?) used.
From:
Thomas Kellerer Date: Subject:
Re: Resurrected thread: Speed improvement - Group batch Insert -
Rewrite the INSERT at the driver level (using a parameter)