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Add breaking change note to Changelog about Rows no longer implementing Iterator

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John Gallagher 2016-05-18 22:03:46 -05:00
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Changelog.md
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@ -1,5 +1,12 @@
# Version UPCOMING (...)
* BREAKING CHANGE: `Rows` no longer implements `Iterator`. It still has a `next()` method, but
the lifetime of the returned `Row` is now tied to the lifetime of the vending `Rows` object.
This behavior is more correct. Previously there were runtime checks to prevent misuse, but
other changes in this release to reset statements as soon as possible introduced yet another
hazard related to the lack of these lifetime connections. We were already recommending the
use of `query_map` and `query_and_then` over raw `query`; both of theose still return handles
that implement `Iterator`.
* BREAKING CHANGE: Creating transactions from a `Connection` or savepoints from a `Transaction`
now take `&mut self` instead of `&self` to correctly represent that transactions within a
connection are inherently nested. While a transaction is alive, the parent connection or