如何取消德比声明？

Question

I have a very long sql statement, with java derby database, and I should want provide to the user a "cancel" things. But I get :

Caused by: java.sql.SQLException: Feature not implemented: cancel.
    at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
    at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown Source)

So how can I do something like that with derby ?

Thanks.

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Edit 1

There is no next loop in my request ; here is my big sql call:

"DELETE FROM TABLE "
+ "WHERE "
+ "REF_TICKET IN 
+   "(SELECT NTICKET FROM OTHER_TABLE WHERE "
+   "REF_OPEN IN 
+    (SELECT OPEN FROM AGAIN_ANOTHER_TABLE WHERE "
+    "{fn TIMESTAMPDIFF( SQL_TSI_DAY, TIMECLOSE, CURRENT_DATE)} > 365))");

So it's all in one statement.

Answer 1

It's usually not the ExecuteQuery() call that takes very long, but the ResultSet.next() loop that runs for a long time, fetching all the rows. So just check for the user's cancel request during your row-fetching loop, say, every hundred rows or so.