Re: JDBC: getMoreResults() versus rs.next() & autoGeneratedKeys
On 12/21/2013 4:15 AM, Robert Klemme wrote:
On 21.12.2013 01:08, Arne Vajh?j wrote:
On 12/20/2013 9:07 AM, Andreas Leitgeb wrote:
I have to write code to execute runtime-specified SQL-statements,
and there are two things that I wasn't able to understand from reading
the javadocs:
1.)
When would one call .getMoreResults() on a statement instead of just
another rs.next() on the first one (obtained from stmnt.getResultSet())?
Are these equivalent, or is there really a concept of multiple
ResultSets,
each of which has its own independent set of rows?
Yes.
Some databases support stored procedures returning multiple
result sets.
That feature is not limited to stored procedures. You can have multiple
statements executed with a single Statement. Consequently you get
multiple results.
The common interpretation of JDBC spec and API docs is that
multiple SQL statements in single JDBC statement object is
not supported.
And it fact it typical does not work.
Only exception I know about is MySQL where you can specify
allowMultiQueries=true in the connection string to enable the
feature.
Many other database API's are more flexible (flexible includes
both programmer intentions and what can be done via SQL injection).
Arne
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