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[JDBC-91] Issue with H2 "script" command Created: 20/Feb/14  Updated: 15/Apr/14

Status: In Progress
Project: java.jdbc
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Defect Priority: Major
Reporter: Mike Anderson Assignee: Sean Corfield
Resolution: Unresolved Votes: 0
Labels: None


 Description   

While trying to execute an H2 "script" statement as follows:

(defn script []
(jdbc/execute! db [(str "script to '" "dbscript.txt" "';")]))

I get the following error message:

org.h2.jdbc.JdbcSQLException: Method is not allowed for a query. Use execute or executeQuery instead of executeUpdate; SQL statement:
script to 'dbscript.txt'; [90001-175]
at org.h2.message.DbException.getJdbcSQLException(DbException.java:332)
at org.h2.message.DbException.get(DbException.java:172)
at org.h2.message.DbException.get(DbException.java:149)
at org.h2.message.DbException.get(DbException.java:138)
at org.h2.command.Prepared.update(Prepared.java:200)
at org.h2.command.CommandContainer.update(CommandContainer.java:79)
at org.h2.command.Command.executeUpdate(Command.java:253)
at org.h2.jdbc.JdbcPreparedStatement.executeUpdateInternal(JdbcPreparedStatement.java:154)
at org.h2.jdbc.JdbcPreparedStatement.executeUpdate(JdbcPreparedStatement.java:140)
at clojure.java.jdbc$db_do_prepared$fn__339.invoke(jdbc.clj:639)
at clojure.java.jdbc$db_transaction_STAR_.doInvoke(jdbc.clj:514)
at clojure.lang.RestFn.invoke(RestFn.java:425)
at clojure.java.jdbc$db_do_prepared.doInvoke(jdbc.clj:638)
at clojure.lang.RestFn.invoke(RestFn.java:442)
at clojure.java.jdbc$execute_BANG_$execute_helper__368.invoke(jdbc.clj:738)
at clojure.java.jdbc$execute_BANG_.doInvoke(jdbc.clj:742)

It's possible that I'm just doing something stupid as I don't really knwo the internals of java.jdbc, but it looks like this is a bug with the type of query being constructed in "db_do_prepared"?



 Comments   
Comment by Sean Corfield [ 28/Feb/14 1:44 AM ]

Mike, since "script to file.txt;" is not a query or update, I would expect db-do-commands to be the right function to call here, not execute! - can you try that and let me know if it works?

Comment by Mike Anderson [ 14/Apr/14 10:27 PM ]

Hi Sean, I still seem to get an error:

(j/db-do-commands db (str "SCRIPT TO '" "dbscript.txt" "';"))
=>
JdbcBatchUpdateException Method is not allowed for a query. Use execute or executeQuery instead of executeUpdate; SQL statement:
SCRIPT TO 'dbscript.txt'; [90001-175] org.h2.jdbc.JdbcStatement.executeBatch (JdbcStatement.java:672)

Comment by Mike Anderson [ 14/Apr/14 10:33 PM ]

Interestingly, this seems to work:

(j/query db [(str "SCRIPT TO '" "dbscript.txt" "';")])

So I have a good workaround at least. Not sure what the right overall solution is - maybe some clearer error messages or docstrings regarding what is / isn't allowed with each type of query would be good?

Comment by Sean Corfield [ 14/Apr/14 11:03 PM ]

Well, I don't have much control over what the JDBC driver itself accepts or doesn't accept for various commands but perhaps introducing a variant of db-do-commands that allows you to specify exactly what method on the PreparedStatement gets called would be helpful here. Or maybe you could just create a PrepatedStatement object - there's an API for that - and run non-standard commands thru that directly?

Comment by Mike Anderson [ 15/Apr/14 11:02 PM ]

Well I'm not a JDBC expert so don't want to give too strong an opinion on API design

My feeling is that some kind of variant of `db-do-commends`, perhaps with keyword arguments (which override a sensible default) would be useful. But that is only a hunch... and I'm not sure if it conflicts with any other assumptions in the design. And I certainly wouldn't want to complicate the API design if this is just a corner case / H2 quirk.

Perhaps just docstring changes that make clear the usage of executeQuery vs. execute vs. executeBatch etc. would be sufficient? I think that was what was fundamentally causing me some confusion.

Anyway I have a good workaround now. So feel free to close / re-purpose this issue as you wish!





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