handle driver timeout error #8
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Closes github#822. In go-sql-driver/mysql#1075, @acharis notes that the way the go-sql driver is written, query timeout errors don't get set in `rows.Err()` until _after_ a call to `rows.Next()` is made. Because this kind of error means there will be no rows in the result set, the `for rows.Next()` will never enter the for loop, so we must check the value of `rows.Err()` after the loop, and surface the error up appropriately.
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Heh, sorry for the mess. Replaces #3
re-submitting github#835 by @ajm188
Closes github#822.
In go-sql-driver/mysql#1075, @acharis notes
that the way the go-sql driver is written, query timeout errors don't
get set in rows.Err() until after a call to rows.Next() is made.
Because this kind of error means there will be no rows in the result
set, the for rows.Next() will never enter the for loop, so we must
check the value of rows.Err() after the loop, and surface the error up
appropriately.
I then went ahead and fixed up the error checking in the two remaining
places we use db.Query, and validated I've covered all cases by
running: