I concur with David's opinion that if you think you need more
parameters, you're doing it wrong.  One idea to consider is
aggregating similar values into an array parameter.

I disagree:

1. It is extremely convenient to insert multiple values in a single SQL insert:

INSERT INTO table_name (f1,f2,f3) VALUES (1,"text",2.4), (2,"text2",2.5),...

Setting all values as JDBC parameters is the easiest way to integrate java/scala and SQL.
A single insert of 10000 records is several orders of magnitudes faster than 10000 separate inserts, not to mention transaction simplification.

2. For automatic scala<->jdbc integration tools such as https://github.com/mal19992/sqlps a number of  JDBC arguments can be generated by an automatic transformation, the SQL and JDBC arguments are autogenerated and can be a very large number.
Suggested by David approach "like using a temp table and a join instead of an IN operator." is extremely inconvenient for automatic tools.

Vladislav