How to get the number of records of a streaming result set

Question

Hi guys.
So if it wasn't a streaming result set, I would have done this:
{noformat}myResultSet<code class="jive-code jive-java">.last();
{color:navy}*int*{color} numResults = </code>myResultSet<code class="jive-code jive-java">.getRow();
</code>myResultSet<code class="jive-code jive-java">.beforeFirst();
</code>{noformat}
but being a streaming result set, beforeFirst() throws an exception...
So how do you get the number of records in that result set? I wanna avoid an extra count(*) query, so I would appreciate other solutions than that.

Answer 1

JoachimSauer wrote:
vanwil wrote:
you see, for now I just use a count(*) query to get the number of records, but that's adding a lot of extra waiting time...Iterating over the result twice will surely be slower then doing the count(*).great! so what I got now is actually the fastest way there is... awesome...
If you get an exception, then you surely have a stack trace. That should tell you what happens, or at least where.com.mysql.jdbc.MysqlIO.checkForOutstandingStreamingData(MysqlIO.java:2066)
Why do you need to know the number of elements beforehand, anyway?I need to know the number of elements because the incoming data goes into a table. Now of course, I could use ArrayList<String[]> or something, but wouldn't that require more memory resources than Object[][] ?
No one can tell you that, at least not without more information (say, the stack trace for example).Here's the exception message:
java.sql.SQLException: Streaming result set com.mysql.jdbc.RowDataDynamic@10c0ef2 is still active. Only one streaming result set may be open and in use per-connection. Ensure that you have called .close() on  any active result sets before attempting more queries.