Comments (5)
The Tuple List Parameter supports multi-record insert for the INSERT...VALUES (...),(...) syntax, but you can still hit some JDBC driver limits with this, which is what is happening here. The limits may be higher with other database drivers.
For these kinds of batch cases, you can map
or doseq
through your batch calling your single-record insert or multi-record insert (cut up your batch with partition-all
).
On the other hand, I say know your tools and use them to their full extent. Using clojure.java.jdbc/insert!
is fine. It's already internally mapping over insert-single-row-sql
, so why not use it instead of needing to write your own?
But, I can see how this is confusing, and I think this at least needs some more documentation with an example or two.
from hugsql.
Thanks for the clarification! I had a solution with map
-ing over the single insert statement before and I was under the impression that the insert!
method was faster, but that may just as well have been the placebo effect, I did not do any proper profiling.
Also, thank you for creating the library, I've been looking for a replacement to yesql and this looks very much like it :-)
from hugsql.
Thanks again for the report!
from hugsql.
...I was under the impression that the insert! method was faster, but that may just as well have been the placebo effect...
insert!
may have been faster if it was a single transaction and your map
-ing solution was multiple transactions. See Transactions.
from hugsql.
I was curious on the actual limit of parameters. It looks like ~32k for postgresql, and ~2k for sql server.
http://www.postgresql.org/message-id/[email protected]
http://stackoverflow.com/questions/14631346/java-jdbc-prepared-statement-maximum-parameter-markers
edit: Also mentioned in the SO post is that for postgres, before 9.4 every record in a batch did a round trip if a generated key was returned. Am I reading that right? Or is that a different kind of jdbc "batch"?
from hugsql.
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