Another thought is to trap for errors in the mysql_query statement, since 
whatever it's  generating isn't being interpreted as an acceptable result set 
by the server.
 
Bruce Smith


________________________________
From: asgallant <[email protected]>
To: [email protected]
Cc: Bruce Smith <[email protected]>
Sent: Monday, August 29, 2011 10:06 AM
Subject: Re: [visualization-api] Re: line chart from mysql example


Since you are getting an error related to the mysql_num_rows() function, it 
seems likely that the problem is either in your SQL itself or the code you are 
using to connect to the database.  Try using a simple query (like "SELECT * 
from date") and see if that returns anything.  If not, then the problem is 
probably in your connection code (the missing "$" in front of "database_name" 
seems a probable cause, but as BruceS mentioned, I would think that would trip 
the "or die" clause).  If the simple select works, then try your select 
statement from the MySQL command line or your database interface (something 
like PHPMyAdmin) and see what it returns.

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