Prevent resource leak by closing the PreparedStatement

[lburja]

fix(jdbc): avoid resource leak when using batching, by closing the PreparedStatement

close #321

[loicmathieu]

Thanks, this looks good to me.

Did you tested it with your file that contains 1.6M rows ?

[lburja]

Yes I did. I modified locally the test BatchTest::namedInsert to insert 2.000.000 rows into a table instead of 5.

As expected, the test fails:

Then, I applied the fix, and now the test passes:

[loicmathieu]

@lburja great! Thanks for the confirmation