multiple successive queries to a database

by iki » Mon, 13 Apr 2009 12:04:08 GMT


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 Has anyone other than me needed to make consecutive queries to a
sqlitedatabase?
My application works sometimes but other times (about 98% of the
time), the app will crash.
What I'm doing is using the sqlitedatabase.query(..) to return a
cursor which I parse,
I make multiple successive queries to the database and parse different
recordsets/cursors.

My question would be does a sqlitedatabase need to recover or clean up
after a .query is issued?

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multiple successive queries to a database

by Ralf » Mon, 13 Apr 2009 12:15:36 GMT


 What kind of "crash" do you get? Is this a force close or an exception?
R/




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multiple successive queries to a database

by iki » Wed, 15 Apr 2009 13:39:04 GMT


 The application has stopped unexpectedly.
Please try again.

One query always works.
Two consecutive queries works about 75% of the time.
Three consecutive queries works about a third.
Four consecutive queries works about 10%
Five doesn't seem to work at all (it worked once out of many tries).




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multiple successive queries to a database

by iki » Thu, 16 Apr 2009 07:58:28 GMT


 Thanks for the help (DDMS logcat, I didn't realize it tracked real
time activity).

It turns out it wasn't the sqlitedatabase query() method that was
causing the problem.

I had a line of code:
Random.nextInt(Cursor.getCount()) - 1
 to pick a random record from the returned cursor.
The problem is that the range is from -1 to Cursor.getCount() - 1 so
when nextInt(..) returned a -1, it was returning the Cursor BOF which
was throwing a CursorIndexOutOfBoundsException.

I just changed the line to:
Random.nextInt(Cursor.getCount() - 1)
 so that the range is from 0 to Cursor.getCount() - 1.






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