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A problem with redefining the lifetime of a PREPARE'd statement according to if it was defined within an explicitly managed transaction or not would be with middlewares such as J2EE / EJB containers. The container / JDBC driver performs most operations within explicitly managed transactions *by the middleware container*, and, if the middleware container is configured to cache prepared statements between transactions, then it will expect them to live well beyond their initial explicitly-managed transaction.
---- James Robinson Socialserve.com
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